Regulators ICs for Digital Cameras and Camcorders Switching Regulator IC with Built-in FET (5V) No.10036EAT09 BD9757MWV Description BD9757MWV is an 8-channel switching regulator with a built-in FET for digital still camera. It has a built-in function to light-control the white LED for backlight according to the light control setting signal from microcomputer. Features 1) Starting from VBAT terminal of 1.5V 2) Power of internal circuit is supplied from voltage boost CH1 3) Mounted with a total of 8ch including voltage boost 2ch, voltage step-down 4ch, inversion 1ch, and white LED-purpose voltage boost (compatible with DC light control) 1ch 4) Built-in 5-channel transistors for synchronous rectification 5) Built-in 2-channel FET transistors for voltage boost 6) Built-in all-channel phase compensation between input and output of error amplifier 7) Channel 1 and 3 are common, but other channels are independent, so the ON/OFF is possible 8) Operating frequencies of 1.2MHz (CH1 ~ 5), 600KHz(CH6 ~ 8) 9) Built-in output breaking circuit (timer latch type) at the time of overload 10) Built-in 2ch of high side switch with soft start function 11) UQFN044V6060 package (6mmx6mm ,0.4mm pitch) with heat dissipation Applications Digital still camera Absolute maximum ratings (Ta=25) Parameter Symbol Ratings Units VBAT -0.3 ~ 7 V VHx1 ~ 5 -0.3 ~ 7 V HS78H -0.3 ~ 7 V VLx7,8 -0.3 ~ 22 V IomaxLx1 2.5 A IomaxHx1 1.5 A IomaxHx2,5 +1.0 A IomaxHx3,4 +0.8 A IomaxHS78 +1.2 A IomaxLx7,8 1.0 A Pd 0.54(1) W Operating temperature range Topr -25 ~ +85 Storage temperature range Tstg -55 ~ +150 Tjmax +150 Power Supply Voltage Power Input Voltage Maximum output current Power Dissipation Junction temperature 1 At the time of a single IC. If used in more than Ta=25, reduced by 4.32mW/. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 1/20 2010.11 - Rev.A Technical Note BD9757MWV Operating conditions Ratings Parameter Power supply voltage VREF terminal connection capacity VREGA terminal connection capacity Symbol Unit Min. Typ. Max. VBAT 1.5 - 5.5 V CVREF 0.47 1.0 4.7 F CVREGA 0.47 1.0 4.7 F - - sec - - sec conditions CH8 modulated light H fixed time when the modulated light control setting is determined TON L fixed time when OFF TOFF H fixed time at the time of modulated light control setting L fixed time at the time of modulated light control setting H fixed time at the time of EN starting up L fixed time before modulated light control setting Time of light control setting at the time of starting up 265X 1/fosc1 256X 1/fosc1 TH 500 - 10000 nsec TL 500 - 10000 nsec - - sec TEN TCLR 4X 1/fosc1 7X 1/fosc1 - 255X 1/fosc1 2048X 1/fosc1 sec TSET - - CH1 PMOS drain current Idpl1 - - 1.2 A CH1 NMOS drain current Idnl1 - - 2.3 A CH2,5 PMOS drain current Idpl2 - - 0.8 A CH2, 5 NMOS drain current Idnl2 - - 0.8 A CH3, 4 PMOS drain current Idpl22 - - 0.6 A CH3, 4 NMOS drain current Idnl22 - - 0.6 A CH6 driver output peak current Idpeak - - 0.5 A CH7, 8 high side switch input current Idpl7,8 - - 1.0 A Idnl6 - - 0.8 A CH1 - 4.5 - 5.4 V CH2 - 1.0 - 4.4 V CH3 - 1.0 - 4.4 V CH4 - 1.0 - 4.4 V CH5 - 1.0 - 4.4 V CH6 - -8.0 - -5.0 V CH7 - 8.5 - 16 V CH8 - 8.5 - 20 V sec Driver CH7, 8 NMOS drain current Output voltage setting range www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 2/20 2010.11 - Rev.A Technical Note BD9757MWV Electrical characteristics (Unless specified, Ta=25, VCCOUT=5.0V, VBAT=3V, STB13 ~ 7=3V,UPIC8=2.5V) Limits Parameter Symbol Unit Conditions Min. Typ. Max. 2.4 2.5 2.6 V Io=5mA VREGA monitor Internal regulator VREGA Output voltage VREGA Low-voltage input malfunction prevention circuit Detecting voltage 1 Vstd1 - 2.0 2.3 V Hysteresis width 1 Vstd1 50 100 200 mV Detecting voltage 2 Vstd2 - 2.4 2.5 V Hysteresis width 2 Vstd2 100 200 300 mV Tscp 20 25 30 msec Vtcinv 0.38 0. 48 0.58 V Oscillating frequency Fstart 150 300 600 kHz Operation initiation VBAT voltage Vst1 1.5 - - V Start-up CH soft start time Tss1 1.8 3.0 5.3 msec Oscillating frequency CH1 ~ 5 fosc1 1.0 1.2 1.4 MHz Oscillating frequency CH6 ~ 8 fosc2 0.5 0.6 0.7 MHz Max duty 2,3,4,5(voltage step-down) Dmax1d - - 100 % Max duty 1(voltage boost) Dmax1u 86 92 96 % Max duty 6,7,8 Dmax2 86 92 96 % IINV - 0 50 nA INV1 ~ 8, NON5=3.0V INV threshold 1 VINV1 0.79 0.80 0.81 V CH1 ~ 5 INV threshold 2 VINV2 0.99 1.00 1.01 V CH7,8V VINV3 370 400 430 mV VOUT6 -6.09 -6.00 -5.91 V NON6 12k, 72k(3) DVLi - 4.0 12.5 mV VCCOUT=1.5 ~ 5.5V Ios 0.2 1.0 - mA Vref=0V CH2, 5 soft start time Tss2, 5 3.4 4.4 5.4 msec CH3, 4 soft start time Tss3, 4 1.2 2.2 3.2 msec Tss6 3.4 4.4 5.4 msec Tss7, 8 4.4 5.4 6.6 msec VCCOUT monitor Short-circuit protection circuit SCP detecting time Timer start threshold voltage INV terminal monitor CH3 ~ 5 Start circuit Oscillating circuit (2) Error AMP Input bias current INV threshold 3 (max) CH8I Base Bias Voltage Vref for inverted Channel CH6 output voltage Line regulation Output circuit at the time of short-circuit Soft start CH6 soft start time CH7, 8 soft start time 2 3 The protective circuit start working when circuit is operated by 100% duty. So it is possible to use only for transition time shorter than charge time for SCP. Recommend resistor value over 20k between VREF to NON6, because VREF current is under 100A. This product is not designed for normal operation within a radioactive environment. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 3/20 2010.11 - Rev.A Technical Note BD9757MWV Electrical characteristics (Unless specified, Ta=25, VCCOUT=5.0V, VBAT=3V, STB13 ~ 7=3V,UPIC8=2.5V) Limits Parameter Symbol Unit Min. Typ. Max. Conditions Output Driver CH1 High side switch ON resistance RON1p - 120 270 m Hx1=5V CH1 Low side switch ON resistance RON1N - 80 240 m VCCOUT=5.0V CH2 High side switch ON resistance RON21p - 250 400 m Hx2=5V CH2 Low side switch ON resistance RON21N - 250 400 m VCCOUT=5.0V CH3 High side switch ON resistance RON3p - 250 400 m Hx3=3V , VCCOUT=5V CH3 Low side switch ON resistance RON3N - 250 400 m VCCOUT=5.0V CH4 High side switch ON resistance RON4p - 250 400 m Hx4=3V, VCCOUT=5V CH4 Low side switch ON resistance RON4N - 250 400 m VCCOUT=5.0V CH5 High side switch ON resistance RON5p - 250 400 m Hx5=5V CH5 Low side switch ON resistance RON5N - 150 300 m VCCOUT=5.0V Output voltage H at the time of CH6 driving Vout6H - V Output voltage L at the time of CH6 driving Vout6L - 0.5 1.0 V CH7,8 NMOS switch ON resistance RON7,8N - 500 800 m VCCOUT=5.0V CH7,8 load switch ON resistance RON7,8p - 200 350 m HS7,8H=3V , VCCOUT=5.0V operating VSTBH1 1.5 - 5.5 V Non-operating VSTBL1 -0.3 - 0.3 V RSTB1 250 400 700 k H level VUPIH 2.1 - 4.00 V L level VUPIL 0 - 0.40 V RUPIC1 30 50 80 k ISTB1 - - 5 A ISTB4 - - 5 A ISTB2 - - 5 A Voltage step-down ISTB3 - - 5 A Voltage boost IST - 150 450 A VBAT=1.5V Icc1 - 45 150 A VBAT=3.0V Icc2 - 5.0 9.7 mA INV1 ~ 8=1.2V , NON6=-0.2V VCCOUT VCCOUT -1.5 -1.0 IOUT6=50mA NON6=0.2V IOUT6=-50mA, NON6=-0.2V STB1 ~ 7 STB control voltage Pull down resistance UPIC8 UPIC8 Control voltage Pull down resistance Circuit current VBAT terminal Circuit current at the HS7,8H terminal time of standby Hx terminal Lx terminal Circuit current at the time of Start-up (VBAT terminal inflow current) Circuit current 1 at the time of operating (VBAT terminal inflow current) Circuit current 2 at the time of operating (VCCOUT applied terminal inflow current) This product is not designed for normal operation within a radioactive environment. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 4/20 2010.11 - Rev.A Technical Note BD9757MWV Reference data (1) Start-up circuit operating frequency temperature characteristic Current mode operating frequency temperature characteristic 600 1.40 700 1.35 680 500 Voltage mode operating frequency temperature characteristic 660 1.30 200 freq[KHz] 300 640 1.25 freq[MHz] freq[KHz] 400 1.20 1.15 520 1.00 -40 -20 0 20 40 60 80 100 500 -40 -20 0 20 40 Ta [] Ta [] 60 80 100 -40 Fig.2 Frequency CH1 ~ 5-Temp Fig.1 Start-up circuit frequency-Temp 580 540 1.05 0 600 560 1.10 100 620 VREGA output voltage temperature characteristic -20 0 20 40 Ta [] 60 80 100 Fig.3 Frequency CH6 ~ 8-Temp VREF6 output voltage temperature characteristic 2.60 1.06 2.58 2.56 1.04 2.52 2.50 2.48 VREF6 [V] VREGA [V] 2.54 2.46 2.44 2.42 1.02 1.00 0.98 0.96 2.40 -40 -20 0 20 40 Ta [] 60 80 0.94 100 -40 Fig.4 VREGA output voltage-Temp -20 0 20 40 Ta [] 60 80 100 Fig.5 CH6 Base voltage-Temp CH1 boost 5.0 efficiency data CH2 step-down 3.2V efficiency data CH3 step-down 1.2V efficiency data 100 100 100 95 95 95 90 90 85 90 80 Vin=1.5V 75 Vin=2.4V 70 75 55 60 Vin=1.5V 60 55 Vin=2.4V Vin=4.8V 50 Vin=4.2V Vin=5.5V 45 40 50 10 100 1000 10000 10 100 100 0 Vin=3.6V Vin=5.5V 10 100 1000 Load current[mA] Load current[mA] Load current [mA] Fig.6 CH1 5.0V voltage boost efficiency-Io Fig.7 CH2 3.2V step-down efficiency-Io Fig.8 CH2 3.2V step-down efficiency-Io CH4 step-down 1.8V efficiency data CH6 Reversal -6V efficiency data CH5 step-down 3.5V efficiency data 100 95 95 90 85 90 100 90 Efficiency [%] 100 85 80 Efficiency [%] Efficiency [%] 65 Vin=3.6V 60 Vin=4.2V 75 70 Vin=4.2V 70 65 Vin=3.6V 65 80 80 Efficiency 85 Efficiency Efficiency 85 75 70 65 80 75 70 60 Vin=2.4V 55 50 Vin=3.6V Vin=4.2V 60 45 Vin=5.5V 55 Vin=4.2V 65 10 100 1000 Load current [mA] Fig.9 CH4 1.8V step-down efficiency-Io www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 70 Vin=2.4V Vin=3.6V 60 Vin=4.2V Vin=4.8V Vin=5.5V 50 Vin=5.5V 40 50 40 80 10 100 1000 Load current [mA] Fig.10 CH5 3.5V step-down efficiency-Io 5/20 1 10 100 Load current [mA] Fig.11 CH6 -6V inverting efficiency-Io 2010.11 - Rev.A Technical Note BD9757MWV Reference data (2) CH8 LED efficiency data CH7 boost12V efficiency data 100 100 90 95 Efficiency [V] Efficiency [%] Io=7.5mA 80 70 Vin=1.5V 60 Vin=2.4V Io=12.5mA Io=17mA 90 Io=20mA 85 80 Vin=3.6V 50 75 Vin=4.2V Vin=5.5V 70 40 1 10 100 0 1 Fig.12 CH7 12V boost efficiency-Io 2 3 4 5 6 Input voltaage [V] Load current [mA] Fig.13 CH8 LED boost efficiency-Io STB13 STB2 STB13 Vo1 Vo1 Vo2 Vo3 Inflow current(1A/Div) Inflow current (1A/Div) Inflow current (1A/Div) Fig.14 CH1 start-up waveform (VBAT=1.5V) STB4 Fig.15 CH1,3 start-up waveform (VBAT=3.0V) Fig.16 CH2 start-up waveform STB6 STB5 Vo6 Vo4 Vo5 Inflow current (1A/Div) Fig.17 CH4 start-up waveform STB7 Inflow current(1A/Div) Fig.18 CH5 start-up waveform Inflow current (1A/Div) Fig.19 CH6 start-up waveform UPIC8 Vo7 Vo8 Inflow current (1A/Div) Inflow current (1A/Div) Fig.20 CH7 start-up waveform www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. Fig.21 CH8 start-up waveform 6/20 2010.11 - Rev.A Technical Note BD9757MWV 35 HS7L 36 HS78H 37 HS8L 38 39 LX8 PGND678 40 41 INV3 INV4 VBAT HX1 HX1 21 19 LX1 18 LX1 17 LX7 PGND13 16 OUT6 UPIC8 PGND13 LX3 15 14 HX3 13 4 5 6 7 8 STB4 3 STB2 LX2 2 HX4 HX2 1 PGND24 LX4 HX5 STB7 STB6 BD9757MWV LX5 44 22 PGND5 43 24 23 INV1 STB5 42 25 INV2 NON6 INV8 27 26 GND INV7 34 28 VCCOUT VREGA 31 30 29 INV5 32 VREF6 33 INV8I Pin Assignment 9 10 11 20 STB13 12 Fig.22 BD9757MWV Top VIEW Pin Description PIN No. PIN name I/O 21 VBAT I Battery voltage input 28 VCCOUT I Power supply input terminal 26 GND - Earth terminal PGND13,24,5, 678 - Earth terminal with built-in FET 27 VREGA O VREGA output 2.5V output 30 VREF6 O reference voltage output for CH6 inversion 1.0V output 41 OUT6 O CH6 PMOS gate connection terminal Hx1,2,3,4,5 O Synchronous rectification high side switch input terminal, Pch Driver power supply output Lx1,,2,3,4,5,7,8 O Inductor connection terminal HS78H I Built-in load switch power supply input terminal HS7L,HS8L O Built-in load switch output terminal INV1,2,3,4,5,7,8 I Error amplifier inversion input terminal 31 NON6 I Error amplifier non-inversion input terminal 33 INV8I I Error amplifier inversion input terminal STB13,2,4,5,6,7 I UPIC8 I 15,16,7,2,39 19,20,5,13,9,4 17,18,6,14,8,3,40,38 36 35,37 22,25,23,24,29,32,34 12,10,11,1,44,43 42 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. Function CH1 ~ CH7 ON / OFF switch Operating :higher than 1.5V CH8 start-up signal, LED light control-purpose signal input 7/20 Notes Starting up at higher than 1.5V Connecting the CH1 output At the time of All Low Standby state 2010.11 - Rev.A Technical Note BD9757MWV Application circuit (1) Fig.23 Applied circuit diagram 1(lithium 1 cell) Operation notes we are confident that the above applied circuit diagram should be recommended, but please thoroughly confirm its characteristics when using it. In addition, when using it with the external circuit's constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external components and ROHM's IC in terms of not only static characteristic but also transient characteristic. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 8/20 2010.11 - Rev.A Technical Note BD9757MWV Application circuit (2) Fig.24 Applied circuit diagram 2(dry battery x2) Operation notes we are confident that the above applied circuit diagram should be recommended, but please thoroughly confirm its characteristics when using it. In addition, when using it with the external circuit's constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external components and ROHM's IC in terms of not only static characteristic but also transient characteristic. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 9/20 2010.11 - Rev.A Technical Note BD9757MWV Timing chart (1) STB13, STB2 Tss1 After finished CH1 rise, other CH start rise. CH1 Tss1 About 3.0msec Tss3 Tss3 About 2.2msec CH3 Tss2 Tss2 About 4.4msec CH2 STB4, STB5 When CH1 is already risen, CH is start up with STB rise. Tss4 Tss4 About 2.2msec CH4 Tss5 Tss5 About 4.4msec CH5 Fig.25 CH1 ~ 5 start-up sequence STB6, STB7 CH6 reverse output Tss6 Tss6 About4.4msec Tss7 CH7 output Tss7 About5.4msec Fig.26 CH6, 7 start-up sequence www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 10/20 2010.11 - Rev.A Technical Note BD9757MWV Timing chart (2) Interval of modulated light setting UPIC8 About 5.4msec Soft start is started Tss8 according to setting Tss8 Oscillating frequency=6400counts about 5.4msec LED current LED current is adjusted according to the set number of counts Interval of soft start It is returned immediately if the set voltage is exceeded Vo8 Fig.27 CH8 start-up sequence www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 11/20 2010.11 - Rev.A Technical Note BD9757MWV Block explanation 1. VREGA It is a regulator with output voltage of 2.5V and used as a power supply of internal block. In addition, it outputs to outside from VREGA terminal (32pin). 1.0F is recommended as an external capacitor for oscillation prevention. 2. SCP, Timer Latch It is a timer latch type of short-circuit protection circuit. For CH1,2, 6 ~ 8, the error AMP output voltage is monitored, and detected when the feedback voltage deviates from control, for CH3 ~ 5, it is detected when the voltage of INV terminal becomes lower than 80%, and in 25ms the latch circuit operates and the outputs of all the channels are fixed at OFF. In order to reset the latch circuit, please turn off all the STB terminals before turning them on once again or turning power supply on once again. 3. U.V.L.O (Under Voltage Lockout) It is a circuit to prevent malfunction at low voltage. It is to prevent malfunction of internal circuit at the time of rising or dropping to a lower value of power supply voltage. If the voltage of VCCOUT terminal becomes lower than 2.4V, then the output of each DC/DC converter is reset to OFF, and SCP's timer latch & soft start circuit are reset. When control is deviated from, the operation of CH1 at the time of start-up will be explained in START UP OSC mentioned later. 4. Voltage Reference (VREF6) For the reference voltage circuit of CH6 inversion CH, the output voltage is 1V and outputted from VREF6 terminal (30pin). According this voltage and the output voltage of CH6, the dividing resistance (resistor) is set and then the output voltage is set. If STB6 terminal is made to be H level at the time of start-up, then increase gradually the voltage up to 1V. The inversion output of CH6 follows this voltage and performs the soft start. 1.0F is recommended as the external capacitor. 5. OSC It is an oscillation circuit the frequency of which is fixed by a built-in CR. The operating frequencies of CH1 ~ CH5 are set at 1.2MHz, and the operating frequencies of CH6 ~ CH8 are set at 600kHz. 6. ERRAMP 1 ~ 8 It is an error amplifier to detect output signal and output PWM control signal. The reference voltages of ERRAMP (Error Amplifier) of CH1, 2,3,4,5 are internally set at 0.8V, and the reference voltages of ERRAMP (Error Amplifier) of CH7.8 are set at 1.0V. The reference voltage of CH6 is set at GND potential, and for CH8's ERRAMP81, the maximum value of the reference voltage is set at 0.4V. In addition, each CH incorporates a built-in element for phase compensation. 7. ERRCOMP , Start Up OSC It is a comparator to detect the output voltage and control the start circuit, and also an oscillator that is turned ON/OFF by this comparator and starts operating from 1.5V. The frequency of this oscillator is about 300 kHz fixed internally. This oscillator stops operating if VCC terminal becomes more than 2.6V or the soft start time is exceeded. 8. Current mode control block CH1 ~ 5 adopt the PWM method based on current mode. For a current- mode DC/DC converter, FET at the main side of synchronous rectification is turned on when detecting the CLK's edge, and turned off by detecting the peak current by means of the current comparator. 9. PWM COMP PWM converter is a voltage-pulse width converter to control output voltage according to input voltage. It compares the output voltage of error amplifier with the SLOPE waveform, controls the pulse width and outputs to driver. The driver is turned on during the output of error amplifier being higher than SLOPE waveform. The maximum ON duty is set at about 92% internally. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 12/20 2010.11 - Rev.A Technical Note BD9757MWV 10. Nch DRIVER , Pch DRIVER It is a CMOS inverter type of output circuit to drive both built-in and external Nch,Pch FET. 11. Load switch It is a circuit, mounted in CH7, 8, to control the Load switch. HS78H terminal (36pin) is input terminal, and the HS67 and HS78 terminals (40,37pin) are output terminals. This control circuit can prevent the rush current at the time of switch ON because the soft start starts functioning at the time of start-up. In addition, this Load switch is provided with OCP function to prevent the IC from damage. Ensure that the IC is used within Load switch's rated current when used normally. 12. ON/OFF LOGIC It is the voltage applied to STB terminal and can control the ON/OFF of CH1 ~ CH7. If the voltage more than 1.5V is applied, then it becomes ON, but if open or 0V is applied, then it becomes off, furthermore, it all the channels are turned off, then the whole IC will be in standby state. In addition, STB13 ~ STB7 terminals contain respectively a built-in pull-down resistor of about 400k. UPIC8 is the input terminal of the start signal and the light control signal of CH8. It becomes High if the voltage more than 2.1V is applied and becomes Low if the voltage less than 0.4V is applied. In addition, UPIC8 terminal contains a built-in pull-down resistor of about 50k. 13. SOFT START It is a circuit to apply the soft start to the output voltage of DC/DC converter and prevent the rush current at the start-up. Soft start time varies with the channels. a. CH1 Reaches the target voltage in 3.0 msec. b. CH3,4 Reaches the target voltage in 2.2 msec. c. CH2,5,6 Reaches the target voltage in 4.4 msec. d. CH7,8 Reaches the target voltage in 5.4 msec. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 13/20 2010.11 - Rev.A Technical Note BD9757MWV CH8 Modulated light function explanation VBAT HS78H OCP VCCOUT HS8L To SCP VCCOUT INV8 1.0V + + + + - ERRAMP 8V HS78H Load SW Vo8(Feed Back ch8) Lx8 N-ch DRIVER PWM COMP8 INV8I VREGA1 1Fh(Fixed) UPIC8 I/O (schmitt) counter for tone setting reaches 31 (5bit) COUNT[4:0] S E L PGND678 + + VREGA_D LED INV8I ERRAMP 8I 5->6bit decode latch DACIN[5:0] DAC EN LED Current setting resister R UVLO EN LOGIC RESET GEN EN UVLO STBY SOFT START SS_CLK OSC Detect Counter Detect Counter for H Section for L Section (6bit) (6bit) P&R area Fig.28 CH8 block diagram Description of CH8 operation EN, the signal for getting CH8 operated, is turned to H (EN=H) by maintaining the H interval that is shown by TEN and from UPIC8 terminal (refer to Fig.29 EN start-up-G) . EN signal is turned to L and CH8 is turned OFF by maintaining the L interval that is shown by TOFF and from UPIC8 terminal (refer to Fig.29 EN start-up-K ~ L) . Moreover, UPIC8 terminal will not become L ever since EN starting-up, and if the H interval shown by TON is passed, then the DAC input data (DACIN [4:0]) for setting of INV8I output voltage is started up by the state of MAX voltage setting (1Fh) (refer to Fig.29 FULLON Mode-H ~ I). As for the method to set the values except MAX voltage as INV8I voltage, first fix the UPIC8 terminal on interval L shown by TCLR and then reset the counter for tone setting, before inputting only the number of times equivalent to the tone intended for setting the UPIC8 terminal's rising edge. Right after that, if it is fixed on interval H shown by TON, then the number of count is latched, transmitted to DAC, and the voltage of INV8I is switched to the set voltage. At the time of setting again, please repeat this operation (procedure). For the frequency of pulse inputted to UPIC8 terminal, please follow the rules of TH and TL. (refer to Fig.29 Normal mode-K ~ N, and refer to P.2 for the rules). Once the counter for tone setting reaches 31, 1Fh remains unchanged no matter how many times it is counted. If the counter for tone setting needs to be cleared, please input the interval L of TCLR. If the pulses less than TCLR is continued to be inputted to UPIC8 terminal after EN becomes H (EN=H) at the time of starting up, then the value of counter for tone setting is undetermined, and DAC for INV8I output voltage setting is turned OFF, therefore, please determine the set value with the time shown by TSET . Furthermore, for the possible setting range of INV8I output voltage value, please refer to P.16(Fig.30 LED current value setting). Points for attention at the time of CH8 starting up Soft start is started when light control setting signal is inputted from UPIC8 terminal. At this moment it is necessary to make any one of STB1 ~ 7 to be H, if OSC does not start oscillating after VREGA is started and UVLO is released, then CH8 does not start up. At the time of starting up there is no voltage enough for turning ON the LED, so the feedback on the side of INV8I does not return,and it is soft-started by the voltage feedback from Vo8 to INV8. Before the soft start internal is ended, the feedback (return) based on any current setting which is according to light control setting is started. After soft-starting, any current setting is performed by changing the light control setting signal. CH8 is turned off by making UPIC8 terminal to be L for a certain period of time. Moreover, the interval of about 5.4mS from the time of UPIC8 terminal's rising is taken as the soft start interval, and the soft start is applied according to the current value originally set by light control from UPIC8 terminal. The change of light control setting excepting turning off during this interval is not reflected. Recommended method of setting at the time of INV8I output voltage setting If INV8I output setting value is made larger than previous setting value during all intervals but soft start interval (at the time of starting up), it is recommended that the value of voltage is increased step by step with the smallest possible width of step after fully evaluating the restriction at the soft side that controls rush current and switching and the vision of brightness etc. in terms of set application. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 14/20 2010.11 - Rev.A Technical Note BD9757MWV Explanation on operation of CH8 5bit Counter + Register Fig.29 Timing chart www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 15/20 2010.11 - Rev.A Technical Note BD9757MWV UPIC8 rising edge count DAC input DACIN[4:0] INV8I output voltage [V] 1 01h 0.100 2 02h 0.110 3 03h 0.120 4 04h 0.130 5 05h 0.140 6 06h 0.150 7 07h 0.160 8 08h 0.170 9 09h 0.180 10 0Ah 0.190 11 0Bh 0.200 12 0Ch 0.210 13 0Dh 0.220 14 0Eh 0.230 15 0Fh 0.240 16 10h 0.250 17 11h 0.260 18 12h 0.270 19 13h 0.280 20 14h 0.290 21 15h 0.300 22 16h 0.310 23 17h 0.320 24 18h 0.330 25 19h 0.340 26 1Ah 0.350 27 1Bh 0.360 28 1Ch 0.370 29 1Dh 0.380 30 1Eh 0.390 31 1Fh 0.400 Fig.30 LED current setting (Note 1) LED current = INV8I voltage / resistance R for LED current setting www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 16/20 2010.11 - Rev.A Technical Note BD9757MWV Setting method of IC peripheral components (1) Design of feedback resistor constant VOUT15 ERROR AMP R1 VOUT8 VREF6 VOUT7 ERROR AMP R1 INV R2 R1 INV VOUT6 ERROR AMP8V INV8 R2 R2 VREF 0.8V ERROR AMP R1 NON R2 VREF 1.0V VREF 1.0V Reference voltage is connected to GND inside IC Output level L takes priority ERROR AMP7I INV8I CH15 output voltage R1 R2 0.8 [ V ] (1) VO R2 CH6 output voltage R2 VO 1.0 [ V ] (2) R1 CH7,8 output voltage R1 R2 1.0 [ V ] (3) VO R2 CH8 output voltage INV 8I IO [ A ] (4) R3 R3 VREF UPIC8 Setting according to number of counts (Refer to Fig.29 of page 15) Fig.31 Feedback resistor setting method (a) CH1 ~ 5 setting The reference voltage of CH1 ~ 5's ERROR AMP is 0.8V. Please refer to Formula (1) in Fig.31 for determining the output voltage. This IC incorporates built-in phase compensation. Please refer to Applied Circuit Diagram for setting the values of R1 & R2 and ensure that the setting values of R1 & R2 are of the order of several hundred k. (b) CH6 setting The reference voltage of CH6's ERROR AMP is connected to GND inside the IC. Therefore, a high-accuracy regulator can be configured if setting by the feedback resistance between the outputs of VREF and CH5 as shown in Fig.31. Please refer to Formula (2) in Fig.31 for determining the output voltage. R1 is recommended as more than 20k because the current capacity of VREF is about 100A. (c) CH7 setting The reference voltage of CH7's ERROR AMP is 1.0V. Please refer to Formula (3) in Fig.31 for determining the output voltage. (d) CH8 setting In the CH8 there are two ERROR AMPs which have different standards, and when used with constant current feedback applied unilaterally to backlight etc., the over voltage protection can be operated unilaterally. Over voltage setting and output current setting are respectively shown in Formula (3) and (4) in Fig.31. The outputs of these two ERROR AMPs are controlled with L being given priority. Therefore, when used under the control of only either of the two ensure that the INV terminal is used as GND Short. CH6, CH7, and CH8 are of voltage mode control. Ensure that CH6, 7 and 8 are used by means of discontinuous inductor current so as to secure the oscillation margin. (2) Points for attention in terms of PCB layout of base-plate For a switching regulator, in principle a large current transiently flows through the route of power supply - coil - output capacitor. Ensure that the wiring impedance is lowered as much as possible by making the pattern as wide as possible and the layout as short as possible. Interference of power supply noise with feedback terminals (INV1 ~ 8I,NON6) may cause the output voltage to oscillate. Ensure that the power supply noise's interference is avoided by making the wiring between feedback resistor and feedback terminal as short as possible. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 17/20 2010.11 - Rev.A Technical Note BD9757MWV PIN equivalent circuit NON6 (Error amplifier's non-inversion input) INV1INV8,INV8I (Error amplifier's inversion input) VREGA VCCOUT VCCOUT VREGA NON6 INV VREGA (REGA output) VREF6 (CH6 Standard voltage output) VCCOUT VREGA VCCOUT VCCOUT VREGA VREF6 STB13, STB2, STB4, STB5, STB6, STB7 (Operating when CH1~7 ON/OFF switch is High) UPIC8 (CH8 start signal, LED modulated light signal input) Hx1,2,3,4,5(Pch FET source terminal) Lx1,2,3,4,5(Nch,Pch FET drain terminal) PGND13,24,5 (output stage earthing terminal) VREGA Hx VCCOUT UPIC8 STB VCCOUT Lx PGND HS78H (high side SW input terminal) HS7L, 8L (high side SW output terminal) OUT5(CH5 power-MOSFET connection) PGND567 (output stage earthing) HS78H VCCOUT Lx7, 8 (Nch FET drain terminal) PGND678 VCCOUT Lx7,8 OUT6 HS7L,8L VCCOUT VCCOUT PGND678 PGND678 Fig.32 PIN equivalent circuit www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 18/20 2010.11 - Rev.A Technical Note BD9757MWV Notes for use 1.) Absolute Maximum Ratings Although the quality of this product has been tightly controlled, deterioration or even destruction may occur if the absolute maximum ratings, such as for applied pressure and operational temperature range, are exceeded. Furthermore, we are unable to assume short or open mode destruction conditions. If special modes which exceed the absolute maximum ratings are expected, physical safely precautions such as fuses should be considered. 2.) GND Potential The potential of the GND pin should be at the minimum potential during all operation status. In addition, please try to do not become electric potential below GND for the terminal other than NON6 including the transient phenomenon in practice. Please do not go down below 0.3V for the NON6 terminal with transient phenomenon and the like when you use. 3.) Heat Design Heat design should consider tolerance dissipation (Pd) during actual use and margins which should be set with plenty of room. 4.) Short-circuiting Between Terminals and Incorrect Mounting When attaching to the printed substrate, pay special attention to the direction and proper placement of the IC. If the IC is attached incorrectly, it may be destroyed. Destruction can also occur when there is a short, which can be caused by foreign objects entering between ouputs or an output and the power GND. 5.) Operation in Strong Magnetic Fields Exercise caution when operating in strong magnet fields, as errors can occur. 6.) About common impedance Please do sufficient consideration for the wiring of power source and GND with the measures such as lowering common impedance, making ripple as small as possible (making the wiring as thick and short as possible, dropping ripple from L.C) and the like. 7.) STB terminal voltage Please set STB terminal voltage below 0.3V when each channel is put in stand-by state, and set it above 1.5V when each channel is put in working condition. Please use the condenser below 0.01F when the condenser is connected to the STB terminal. As it will become the cause of the malfunction. 8.) Heat Protection Circuit (TSD circuit) This IC has a built-in Temperature Protection Circuit (TSD circuit). The temperature protection circuit (TSD circuit) is only to cut off the IC from thermal runaway, and has not been designed to protect or guarantee the IC. Therefore, the user should not plan to activate this circuit with continued operation in mind. 9.) Because there are times when rush current flows instantaneously in internal logical uncertain state at the time of power source turning on with CMOS IC, please pay attention to the power source coupling capacity, the width of GND pattern wiring and power source, and the reel. 10.) Because there are times when rush current flows instantaneously due to the order of power source throwing in, lag with CMOS IC where it has plural power sources, please pay attention to the power source coupling capacity, the width of GND pattern wiring and power source, and the reel. 11.) IC Terminal Input This IC is a monolithic IC, and between each element there is a P+ isolation and P substrate for element separation. There is a P-N junction formed between this P-layer and each element's N-layer, which makes up various parasitic elements. For example, when resistance and transistor are connected with a terminal as in Fig.33: When GND>(terminal A) at the resistance, or GND>(terminal B) at the transistor (NPN), the P-N junction operates as a parasitic diode. Also, when GND>(terminal B) at the transistor, a parasitic NPN transistor operates by the N-layer of other elements close to the aforementioned parasitic diode. With the IC's configuration, the production of parasitic elements by the relationships of the electrical potentials is inevitable. The operation of the parasitic elements can also interfere with the circuit operation, leading to malfunction and even destruction. Therefore, uses which cause the parasitic elements to operate, such as applying voltage to the input terminal which is lower than the GND (P-substrate), should be avoided. Transistor (NPN) (Terminal B) B C E N + P P N + P N P Board + P N Parasitic Element GND GND P N N (Terminal A) + P N P Board Parasitic Element Resistance (Terminal A) Parasitic Element GND GND Fig.33 Simple Structure of Bipolar IC (Sample) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 19/20 2010.11 - Rev.A Technical Note BD9757MWV Ordering part number B D 9 Part No. 7 5 7 Part No. M W V - Package MWV: UQFN044V6060 E 2 Packaging and forming specification E2: Embossed tape and reel UQFN044V6060 <Tape and Reel information> 6.0 0.1 6.00.1 1.0MAX 11 E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 12 3.7 0.1 44 0.5 0.1 2000pcs (0.22) 3.70.1 1 +0.03 0.02 -0.02 S C0.2 Embossed carrier tape Quantity Direction of feed 1PIN MARK 0.08 S Tape 34 22 33 1.0 23 +0.05 0.4 0.2 -0.04 1pin Reel (Unit : mm) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 20/20 Direction of feed Order quantity needs to be multiple of the minimum quantity. 2010.11 - Rev.A Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you (Note 1) , transport intend to use our Products in devices requiring extremely high reliability (such as medical equipment equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property ("Specific Applications"), please consult with the ROHM sales representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM's Products for Specific Applications. (Note1) Medical Equipment Classification of the Specific Applications JAPAN USA EU CHINA CLASS CLASSb CLASS CLASS CLASS CLASS 2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our Products may cause. The following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. Our Products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any ROHM's Products under any special or extraordinary environments or conditions. If you intend to use our Products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust [c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves [e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items [f] Sealing or coating our Products with resin or other coating materials [g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the Products in places subject to dew condensation 4. The Products are not subject to radiation-proof design. 5. Please verify and confirm characteristics of the final or mounted products in using the Products. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8. Confirm that operation temperature is within the specified range described in the product specification. 9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Precaution for Mounting / Circuit board design 1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice - GE (c) 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. Therefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. Precaution for Electrostatic This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). Precaution for Storage / Transportation 1. Product performance and soldered connections may deteriorate if the Products are stored in the places where: [a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] the temperature or humidity exceeds those recommended by ROHM [c] the Products are exposed to direct sunshine or condensation [d] the Products are exposed to high Electrostatic 2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is exceeding the recommended storage time period. 3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of which storage time is exceeding the recommended storage time period. Precaution for Product Label QR code printed on ROHM Products label is for ROHM's internal use only. Precaution for Disposition When disposing Products please dispose them properly using an authorized industry waste company. Precaution for Foreign Exchange and Foreign Trade act Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with ROHM representative in case of export. Precaution Regarding Intellectual Property Rights 1. All information and data including but not limited to application example contained in this document is for reference only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable for infringement of any intellectual property rights or other damages arising from use of such information or data.: 2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any third parties with respect to the information contained in this document. Other Precaution 1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM. 2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of ROHM. 3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the Products or this document for any military purposes, including but not limited to, the development of mass-destruction weapons. 4. The proper names of companies or products described in this document are trademarks or registered trademarks of ROHM, its affiliated companies or third parties. Notice - GE (c) 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM's Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using ROHM's Products, please confirm the la test information with a ROHM sale s representative. 3. The information contained in this doc ument is provi ded on an "as is" basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice - WE (c) 2014 ROHM Co., Ltd. All rights reserved. Rev.001 Datasheet bd9757mwv - Web Page Buy Distribution Inventory Part Number Package Unit Quantity Minimum Package Quantity Packing Type Constitution Materials List RoHS bd9757mwv UQFN044V6060 2000 2000 Taping inquiry Yes