NJM2383
Ver 1.
0
- 1 -
DC/DC CONVERTER CONTROL IC
WITH CURRENT SENSE AMPLIFIER
■GENERAL DESCRIPTION ■PACKAGE OUTLINE
■FEATURES
● PWM switching control
● Operating Voltage (3.6 to 32V)
● Wide Oscillator Range (5 to 350 kHz)
● ON/OFF Circuit (High Active)
● Current Sensing Amplifier
● Soft-Start Function
● UVLO(Under Voltage Lockouts)
● Bipolar Technology
● Package Outline DIP14, DMP14, SSOP10
■PIN CONFIGURATION
The NJM2383 is a low voltage operation DC/DC converte
r
control IC featuring high side current protection, soft star
t
and standby functions.
It is suitable for power module application and on-board
regulators.
NJM2383D
NJM2383V
NJM2383M
NJM2383D
NJM2383M
1.NC
2.IN-1
3.IN-2
4.F.B
5.GND
6.OUT
7.NC
8.NC
9. V+
10.CS
11.CT
12.REF
13.ON/OFF
14.NC
PIN FUNCTION
1
4
3
2
14
11
12
13
5
6
7 8
9
10
1.IN-1
2.IN-2
3.F.B
4.GND
5.OUT
6. V+
7.CS
8.CT
9.REF
10.ON/OFF
PIN FUNCTION
1
4
3
2
5 6
7
8
9
10
NJM2383V
NJM2383
- 2 -
■BLOCK DIAGRAM
1
VREF
CURRENT
SENSE AMP
V+
ER·AMP
L.O
U.V.LO
OSC
PWM
9 8
7 6 5 4 3 2
10
CS CT ON/OFF REF
IN-1 IN-2 OUT GND F.B
0.52V
11 12 13 14
NC
NC
NC
NC
ON/OFF
“High” Active
(Package: DIP14, DMP14)
1
VREF
CURRENT
SENSE AMP
V+
ER·AMP
L.O
U.V.LO
OSC
PWM
9 8 7 6
5 4 3 2
10
CS CT REF ON/OFF
IN-1 IN-2 OUT GND F. B
0.52V
ON/OFF
“High” Active
(Package: SSOP10)
NJM2383
-
3
-
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Input Voltage V+ 36 V
Reference Output Current IOR 10 mA
Output Sink Current ISINK 200 mA
Differential Input Voltage VID 2.5 V
Common Mode Input Voltage VIC -0.3 ∼ 2.5 V
ON/OFF Control Voltage VON/OFF -0.3 ∼ 36 (note) V
Power Dissipation
PD
(DIP 14) 700
(DMP 14) 300
(SSOP 14) 250
mW
Operating Temperature Range TOPR -40 ∼ +85 °C
Storage Temperature Range TSTG -50 ∼ +125 °C
(note) When the supply voltage is less than 36V, the absolute maximum input voltage is equal to the supply voltage.
■ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,VON/OFF=3V,Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Output Voltage VREF I
OR=1mA 2.45 2.50 2.55 V
Line Regulation LINE V+=3.6 ∼ 32V, IOR=1mA – 6.8 20.7 mV
Load Regulation LOAD IOR=0.1 ∼ 5.0mA – 5 30 mV
OSCILLATOR BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Oscillation Frequency fOSC R
T=33kΩ, CT=1000pF 85 105 125 kHz
Oscillate Fluctuations1
(Line Fluctuations)
fdV V+=3.6 ∼ 32V – 1 – %
Oscillate Fluctuations2
(Temp Fluctuations)
fdT Ta=-40 ∼ 85°C – 5 – %
CURRENT SENSE AMPLIFIER BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Offset Voltage1 VIO1 – 2 7 mV
Input Offset Current1 IIO1 – 5 – nA
Input Bias Current1 IB1 – 20 100 nA
Open Loop Gain1 AV1 – 90 – dB
Gain Bandwidth Product1 GB1 – 0.6 – MHz
Input Common Mode
Voltage Ratio1
VICM1 – 0 ∼
VREF-0.8
– V
Maximum Output Voltage1
(F.B Pin)
VOM-1 RNF=100kΩ – – 1 V
Maximum Source Current1
(F.B Pin)
IOM+1 VOM=0.5V 40 85 200 µA
NJM2383
- 4 -
■ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,VON/OFF=3V,Ta=25°C)
ERROR AMPLIFIER BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Reference Voltage2 VB2 0.51 0.52 0.53 V
Input Bias Voltage2 IB2 – 5 100 nA
Open Loop Gain2 AV2 – 90 – dB
Gain Bandwidth Product2 GB2 – 0.6 – MHz
Maximum Output Voltage2
(F.B Pin)
VOM-2 RNF=100kΩ – – 1 V
Maximum Source Current2
(F.B Pin)
IOM+2 VOM=0.5V 40 85 200 µA
PWM COMPARATE BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Threshold Voltage
(F.B Pin)
VTH0 duty·cycle=0%
(note) – 1.65 1.75 V
Input Threshold Voltage
(F.B Pin)
VTH100 duty·cycle=100%
(note) – 2.10 – V
SOFT START CIRCUIT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Bias Current
(CS Pin)
IBCS CS Pin=1.8V – 250 650 nA
Input Threshold Voltage
(CS Pin)
VTHCS0 duty·cycle=0%
(note) – 0.25 0.35 V
Input Threshold Voltage
(CS Pin)
VTHCS50 duty·cycle=100%
(note) – 0.7 – V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
ON Threshold Voltage VTHON – 2.70 – V
OFF Threshold Voltage VTHOFF – 2.52 – V
Hysteresis Voltage VHYS 60 180 – mV
OUTPUT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
L Output Voltage (OUT Pin) VOL Output Sink Current=100mA – 0.25 0.65 V
NJM2383
-
5
-
■ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,VON/OFF=3V,Ta=25°C)
ON/OFF BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
OFF Threshold Voltage
(ON/OFF Pin)
VOFF – – 0.3 V
ON Threshold Voltage
(ON/OFF Pin)
VON 1.1 – – V
Input Bias Current
(ON/OFF Pin)
ION/OFF V
ON/OFF=3V – 100 120 µA
GENERAL CHARACTERISTICS
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Stand-by Current ICCSTBY Stand-by Mode, VON/OFF=0V – 12 20 µA
Latch Mode
Threshold Voltage (CS Pin)
VTHLA 1.2 1.5 1.8 V
Quiescent Current ICCLA Latch Mode – 1.6 2.2 mA
Average Quiescent Current ICCAV RL= , duty·cycle=50% – 5.5 10 mA
(note) Duty·Cycle is defined as follows:
Duty·Cycle=0%: IC output transistor is OFF.
Duty·Cycle=100%: IC output transistor is ON.
■ TYPICAL APPLICATIONS
1
VREF
CURRENT
SENSE AMP
ER·AMP
L.O
U.V.LO
OSC
PWM
9 8 7 6
5 4 3 2
10
0.52V
36kΩ
GND
2.50V
V
+
VOUT
330kΩ 180kΩ 4.7µF
1000pF
ON/OFF
CONTROL
ON/OFF
“High” Active
(Package:SSOP10)
NJM2383
-
6
-
■TIPICAL CHARACTERISTICS
Oscillator Frequency vs. Timing Resistor
(V+=6V,Ta=25°C)
1
10
100
1000
1 10 100 1000 10000
Timing Resistor RT (kΩ)
Oscilltor Frequency fOSC
(kHz)
CT=470pF
CT=1000pF
Oscillator Frequency vs. Timing Capacitor
(V+=6V,Ta=25°C)
1
10
100
1000
10 100 1000 10000 100000
Timing Capacitor CT (pF)
Oscillator Frequencey fOSC
(kHz)
RT=10kΩ
RT=100kΩ
RT=33kΩ
Reference Voltage vs. Operating Voltage
(V+=6V,Ta=25°C)
2.48
2.49
2.5
2.51
2.52
0 10203040
Operating Voltage V+ (V)
Reference Voltage VREF (V)
L Output Voltage vs. Source Current
(V+=6V,RT=33kΩ,CT=1000pF,Ta=25℃)
0
0.2
0.4
0.6
0.8
1
0 50 100 150 200 250
Source Current ISOURCE (mA)
L Output Voltage VOL (V)
Duty Cycle vs. CS Pin Voltage
(V+=6V,Ta=25℃)
0
20
40
60
80
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CS Pin Voltage VTHCS (V)
Duty Cycle α (%)
Suuply Current vs. Supply Voltage
(Ta=25℃)
0
2
4
6
8
10
010203040
Supply Voltage V+ (V)
Suuply Current ICC (mA)
ICCAV
ICCLA
NJM2383
- 7 -
■TIPICAL CHARACTERISTICS
Oscillator Frequency vs. Temperature
(V+=6V,RT=33kΩ,CT=1000pF)
60
80
100
120
140
160
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Oscillator Frequency
fOSC (kHz)
Reference Voltage vs. Temperature
(V+=6V,IOR=1mA)
2
2.2
2.4
2.6
2.8
3
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Reference Voltage
VREF (V)
Stand-by Current vs. Temperature
(Stand-by Mode,V+=6V,VON/OFF=0V)
0
10
20
30
40
50
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Stand-by Current
ICCSTBY (µA)
L Output Voltage vs. Tenperature
(V+=6V,ISINK=100mA,RT=33kΩ,CT=1000pF)
0
0.1
0.2
0.3
0.4
0.5
-50 -25 0 25 50 75 100 125 150
Anbient Temperature Ta (℃)
L Output Voltage VOL (V)
Supply Current vs. Tenperature
(V+=6V,RT=33kΩ,CT=1000pF)
0
2
4
6
8
-50 -25 0 25 50 75 100 125 150
Ambient Tenperature Ta (℃)
Supply Current ICC (mA)
ICCAV
ICCLA
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
