STLQ50xx 50 mA, 3 A supply current low drop linear regulator Datasheet - production data Features 2.3 V to 12 V input voltage range 50 mA maximum output current 3 A quiescent current Available in 1.8 V, 2.5 V, 3.3 V, 5.0 V and adjustable voltage SOT323-5L 200 mV dropout voltage at 25 mA output current Internal thermal protection Available in SOT323-5L package, and SOT235L package (upon request) Portable/battery-powered equipment Electronic sensors Microcontroller power Real-time clock backup power Description The STLQ50xx is a BiCMOS linear regulator specifically designed for operating in environments where very low power consumption is required. Applications SOT23-5L (available on request) Its very low quiescent current (3 A) results in extended battery life, making the device suitable for applications which have very long standby time. The PMOS pass element allows very good dropout values (200 mV at 25 mA IO and 350 mV at full load) without affecting the consumption characteristics. Housed in the very small SOT323-5L or SOT235L, it meets space-saving requirements in battery-powered equipment. Table 1. Device summary Order codes Part number Output voltage SOT323-5L (T&R) SOT23-5L (T&R) (1) STLQ50XX18 STLQ50C18R STLQ50M18R Fixed VO = 1.8 V STLQ50XX25 STLQ50C25R STLQ50M25R Fixed VO = 2.5 V STLQ50XX33 STLQ50C33R STLQ50M33R Fixed VO = 3.3 V STLQ50XX50 STLQ50C50R STLQ50M50R Fixed VO = 5.0 V STLQ50 STLQ50C-R STLQ50M-R Adjustable 1. Available upon request. January 2013 This is information on a product in full production. Doc ID 13205 Rev 5 1/18 www.st.com 18 Contents STLQ50xx Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.1 External components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.2 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.3 Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 Doc ID 13205 Rev 5 STLQ50xx Block diagram Figure 1. STLQ50xx block diagram Vout Vin Adjustable V bandgap 1.22V Fixed 1 Block diagram ADJ Short circuit & thermal protection GND Doc ID 13205 Rev 5 3/18 Pin configuration 2 STLQ50xx Pin configuration Figure 2. Pin connections (top view) OUT ADJ STLQ50 GND N/C Table 2. Pin n IN Pin description Symbol Note ADJ STLQ50: output voltage adjust N/C STLQ50xx: not connected 2 GND Ground 3 N/C Not connected 4 IN 5 OUT 1 4/18 Input voltage Output voltage Doc ID 13205 Rev 5 STLQ50xx 3 Maximum ratings Maximum ratings Table 3. Absolute maximum ratings Symbol Value Unit DC Input voltage -0.3 to +14 V VFB FB voltage -0.3 to +7 V ESD Human body model (all pins) 2 kV Junction temperature -40 to 150 C Storage temperature range -55 to 150 C VI TJ TSTG Note: Parameter Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 4. Symbol RthJA Thermal data Parameter Thermal resistance junction-ambient SOT323-5L SOT23-5L Unit 331.4 (1) 191 (1) C/W 1. This value is referred to a 4-layer PCB, JEDEC standard test board. Doc ID 13205 Rev 5 5/18 Electrical characteristics 4 STLQ50xx Electrical characteristics VI = VO(NOM) +1 V or VI = 2.5 V if VO < 1.5 V; TA= -40 C to 125 C; IO = 1 mA; typical values are at TA = 25 C, CO = 1 F unless otherwise specified. Table 5. Symbol Electrical characteristics Parameter Test conditions VI Input voltage range IQ Quiescent current (measured on ground pin, fixed version) VO Typ. Max. IO = 20 mA 2.3 12 IO = 50 mA 2.5 12 Unit V VI = 5 V 3.5 5.0 VI = 12 V 4.1 6.0 A Output voltage range (STLQ50ADJ) 1.222 11 V Accuracy as percentage of nominal voltage at TJ = 25 C -2 +2 % 0.7 V VDROP-MAX Max dropout voltage (1) VO Min. IO = 50 mA; 0.4 Load regulation 1 mA < IO < 50 mA 0.15 %/mA VO Line regulation VO = 1.5 V: VO + 1 V < VI < 12 V; VO < 1.5 V: 2.5 V < VI < 12 V; 0.3 %/V SVR Supply voltage rejection VRIPPLE = 0.1 V, IO = 20 mA, f = 120 Hz 30 dB eN Output noise voltage BW from 200 Hz to 100 kHZ; IO = 10 mA 560 VRMS Th Thermal protection 160 C 500 mA IOMAX Maximum output current (2) VO = 0 V 1. VI = 2.5 V when VO(NOM) 2.1 V 2. The maximum power dissipation must not be exceeded, see application information for details. 6/18 Doc ID 13205 Rev 5 STLQ50xx 5 Typical application Typical application Figure 3. Fixed versions: STLQ5018- STLQ5025- STLQ5033- STLQ5050 Figure 4. Adjustable version STLQ50ADJ Doc ID 13205 Rev 5 7/18 Typical characteristics STLQ50xx 6 Typical characteristics Figure 5. VO vs. TJ Figure 6. 1.84 2 1.8 1.6 1.82 VO [V] 1.8 VO [V] VO vs. VI 1.78 1.76 1.74 1.72 -50 VI=2.8V, IO=20mA -25 0 25 1.4 1.2 1 0.8 0.6 0.4 0.2 IO=50mA, VO=1.8V 0 50 75 100 0 125 1 2 3 Temp [C] Figure 7. IQ vs. TJ Figure 8. 3.5 0.5 3.4 0.45 0.4 VDROP [V] Iq [A] 3.3 3.2 3.1 3 2.9 -25 0 25 50 75 100 0.35 0.3 0.25 0.2 0.15 TA=25C 0 125 0 10 20 Temp [C] Figure 9. 0.6 ESR[] VDROP [V] 0.5 0.4 0.3 0.2 VO=2.45V, IO=50mA 0 -25 0 25 50 Temp [C] 8/18 40 50 Figure 10. Stability 0.7 -50 30 IO [mA] VDROP vs. TJ 0.1 5 VDROP vs. IO 0.1 0.05 VI=5V, IO=1mA, VO=1.8V 2.8 -50 4 VI [V] 75 100 125 12 11 10 9 8 7 6 5 4 3 2 1 0 TA=25C 0 1 2 3 CO[F] Doc ID 13205 Rev 5 4 5 STLQ50xx Typical characteristics Figure 11. S.V.R. vs. Freq. Figure 12. S.V.R. vs. IO 40 37 27 SVR [dB] SVR [dB] 38 36 34 VO=1.8V, IO=20mA 32 22 17 32 30 28 12 26 7 24 22 2 20 100 1000 10000 VO=1.8V, f=120Hz 100000 0 10 20 30 40 50 IO [mA] Frequency [Hz] Figure 13. Line transient response Figure 14. Load transient response IO=50mA; CO=10F; VI=2.8V, VI rise/fall=5ms CO=1F; VO=1.8V; VI=2.8V, Curr. rise/fall=1s Figure 15. Short-circuit current Figure 16. Thermal protection 0.6 2 VI=2.8V 1.75 0.5 1.5 VO[V] IO [A] 0.4 0.3 1.25 1 0.75 0.2 0.5 0.25 0.1 VO=0, TA=25C 0 0 155 157 159 2 4 6 8 VI [V] 10 12 14 Doc ID 13205 Rev 5 161 163 165 167 169 171 173 175 TJ[C] 9/18 Application information 7 STLQ50xx Application information The STLQ50xx is a BiCMOS linear regulator specifically designed for operating in environments with very low power consumption requirements. The very low quiescent current of 3 A is obtained through the use of CMOS technology which makes the device suitable for application that have long standby time. Its very low power consumption allows extended battery life and the tiny packages (SOT323-5L or SOT23-5L) satisfy the spacesaving requirements of battery-powered equipment. Moreover, the STLQ50xx provides wide input voltage operation from 2.5 V up to 12 V. The PMOS pass element also permits a very good dropout values of 0.7 V at full load and at 125 C without affecting consumption characteristics. 7.1 External components The typical application schematic of the STLQ50xx is shown in Figure 1 - Figure 2, 1 F input and output capacitors placed close to the device are required for proper operation. The device is stable with electrolytic and ceramic output capacitors having values higher than 1 F (see Figure 10 for stability details). In the adjustable version (STLQ50) the output voltage is programmed using an external resistor divider, as shown in Figure 2. The output voltage can be adjusted from 1.22 to 11 V and it can be calculated using the following equation: Equation 1 VO = VFB x (1+R1/R2) where VFB = 1.222 V is the internal reference voltage. The sum of the R1 and R2 resistors should be chosen in order to guarantee at least 1 A of divider current. Lower value resistors improve the noise performance but the quiescent current will increase. Higher value resistors should be avoided because the ADJ leakage current will influence the voltage set by the resistor divider, rendering the formula above no longer valid. The suggested design procedure is to choose R2 = 1 M and then calculate R1 using the following equation: Equation 2 R1 = (VO/VFB-1) x R2 7.2 Power dissipation In order to ensure proper operation, the STLQ50 junction temperature should never exceed 125 C; this limits the maximum power dissipation the regulator can sustain in any application. The maximum power dissipation can be calculated as: Equation 3 PDMAX = (TJMAX - TA)/RthJA where TJMAX = 125 C; 10/18 Doc ID 13205 Rev 5 STLQ50xx Application information TA is the ambient temperature; RthJA is the junction-to-ambient thermal resistance of the package (seeTable 4 thermal data). The power dissipation can be calculated simply as: Equation 4 PD = (VI - VO) x IO In every application condition, PD must be lower than PDMAX. 7.3 Protection The PMOS pass element has an internal diode with anode connected to VO and cathode to VI. In case VO > VI, the current will flow from output to input without limitation. In this case, a proper limiting network is recommended. The current limitation is automatically provided by the characteristics of the PMOS pass element (see typical characteristics), so the short-circuit current is dependent on the input voltage. When considering short-circuit current, take care in any case not to exceed the maximum sustainable power dissipation of the device. The STLQ50 features an internal thermal protection that linearly reduces the output current when the internal temperature increases. Consequently, at a given load, the output voltage decreases also. The action of the thermal protection starts at 125 C when the output voltage slightly decreases, while close to 163 C the output voltage drops to 0 V. Since this is a linear control, sudden overcurrent conditions can quickly raise the chip temperature without giving time for the thermal protection to act, so it cannot be used as a limitation for the output current. Doc ID 13205 Rev 5 11/18 Package mechanical data 8 STLQ50xx Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 12/18 Doc ID 13205 Rev 5 STLQ50xx Package mechanical data SOT323-5L mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. A 0.80 1.10 31.5 43.3 A1 0.00 0.10 0.0 3.9 A2 0.80 1.00 31.5 39.4 b 0.15 0.30 5.9 11.8 C 0.10 0.18 3.9 7.1 D 1.80 2.20 70.9 86.6 E 1.80 2.40 70.9 94.5 E1 1.15 1.35 45.3 53.1 e 0.65 25.6 e1 1.3 51.2 L 0.10 0.30 Doc ID 13205 Rev 5 3.9 11.8 13/18 Package mechanical data STLQ50xx SOT23-5L mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. A 0.90 1.45 35.4 57.1 A1 0.00 0.10 0.0 3.9 A2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 C 0.09 0.20 3.5 7.8 D 2.80 3.00 110.2 118.1 E 1.50 1.75 59.0 68.8 e 0.95 37.4 H 2.60 3.00 102.3 118.1 L 0.10 0.60 3.9 23.6 7049676D 14/18 Doc ID 13205 Rev 5 STLQ50xx Package mechanical data Tape & reel SOT323-xL mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 175 180 185 6.889 7.086 7.283 C 12.8 13 13.2 0.504 0.512 0.519 D 20.2 N 59.5 0.795 60 T 60.5 2.362 14.4 0.567 Ao 2.25 0.088 Bo 2.7 0.106 Ko 1.2 0.047 Po 3.9 4 4.1 0.153 0.157 0.161 P 3.8 4 4.2 0.149 0.157 0.165 Doc ID 13205 Rev 5 15/18 Package mechanical data STLQ50xx Tape & reel SOT23-xL mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 16/18 Max. 0.504 0.512 14.4 0.519 0.567 Ao 3.13 3.23 3.33 0.123 0.127 0.131 Bo 3.07 3.17 3.27 0.120 0.124 0.128 Ko 1.27 1.37 1.47 0.050 0.054 0.0.58 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 3.9 4.0 4.1 0.153 0.157 0.161 Doc ID 13205 Rev 5 STLQ50xx 9 Revision history Revision history Table 6. Document revision history Date Revision Changes 07-Feb-2007 1 Initial release. 13-Feb-2007 2 Typo in cover page 350 mA ==> 350 mV. 06-Jul-2007 3 Added part number. 14-Nov-2007 4 Added Table 1. 31-Jan-2013 5 - Modified line regulation test condition Table 5 on page 6. - Minor text changes throughout the document. Doc ID 13205 Rev 5 17/18 STLQ50xx Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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