A
utomotive NJM2374A-Z
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1
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Ver.2013-08-26
PWM DC/DC CONVERTER IC
■FEATURES ■PACKAGE OUTLINE
●Operating Temperature Ta= -40ºC to +125ºC
●Operating Voltage (3.0V to 40V)
●Wide Oscillator Frequency (100Hz to 100kHz)
●Internal High Power Transistor 1.5A (max.)
●Internal Over Current Limit Circuit
●PWM form Switching Power Supply Control
●Bipolar Technology
●Package Outline DMP8
■PIN CONFIGURATION
■BLOCK DIAGRAM
1
1.5A
Maximum
ON duty 9:1
OSC BLOCK
4
3
2
8
5
6
7
V+
ES
GND
PWM
Logic
R
SQ
Vref
1.25V
±2%
CD
CT
CS
SI
IN+
Vth=300mV
Ipk Sense
PWM COMP
ERR.AMP
160Ω
1.CS
2.ES
3.CT
4.GND
5.IN+
6.V+
7.SI
8.CD
PIN FUNCTION
1
4
3
2
8
5
6
7
NJM2374AM
Automotive NJM2374A-Z
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■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Maximum Supply Voltage V+ 40 V
Output Switch Current ISW 1.5 A
Output Switch Voltage VSW 40
V
Comparator Input Voltage VIR -0.3 to 40
V
Power Dissipation PD 530 (Note 1)
710 (Note 2) mW
Operating Temperature Range Topr -40 to +125 °C
Storage Temperature Range Tstg -50 to +150 °C
(Note1) On the PCB "EIA/JEDEC (114.3×76.2×1.6mm, 2 layers, FR-4)"
(Note2) On the PCB "EIA/JEDEC (114.3×76.2×1.6mm, 4 layers, FR-4)"
In the case of Step-Down and Inverting Conversion with the internal power transistor,
the Output Voltage must be set lower than 6V(-6V).
■ RECOMMENDED OPERATING VOLTAGE (Ta= +25˚C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Supply Voltage V+ 3.0 - 40 V
■ELECTRICAL CHARACTERISTICS
DC Characteristics (V+=5V, Ta=25°C)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
CT=1nF, SI=V+, IN+> Vth, ES=GND – 2.8 4.0 Operating Current 1 ICC1
CT=1nF, SI=V+, IN+> Vth, ES=GND
Ta=-40ºC to +125ºC
– – 8.0
mA
12 20 30 Charge Current Ichg
Ta=-40ºC to +125ºC 4 – 36
μA
110 180 300 Discharge Current Idis
Ta=-40ºC to +125ºC 30 – 330
μA
Voltage Swing VOSC – 0.5 – VP-P
Discharge to Charge
Current Ratio
Iratio S
I=V+ – 9 – –
Ichg=Idis 250 300 350 Peak Current
Sense Voltage
Vipk
Ichg=Idis, Ta=-40ºC to +125ºC 150 – 450
mV
Saturation Voltage 1 Vsat1 Darlington Connection
(CS=CD), ISW=0.7A
– 1.0 1.3 V
Saturation Voltage 2 Vsat2 I
SW=0.7A, Ic(driver)=50mA
(Forced β≈14)
– 0.5 0.7 V
Output Transistor
Bias Resistance
Rbias – 160 – Ω
DC Voltage Gain hFE I
SW=0.7A, VCE=5.0V 35 120 – –
Collector Off-State
Current
IC(Off) V
CE=40V – 10 – nA
1.225 1.250 1.275 Threshold Voltage Vth
Ta=-40ºC to +125ºC 1.18 – 1.32
V
IN+=0V – 40 400 Input Bias Current IIB
IN+=0V, Ta=-40ºC to +125ºC – – 440
nA
(Note) Output switch tests are performed under pulsed conditions to minimize power dissipation.
A
utomotive NJM2374A-Z
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Ver.2013-08-26
■TIMING CHART
Oscillator
Waveform
Reference
Voltage
Output
Voltage
Collector-Emitter
Voltage
High Voltage
Detect
Current-Limit
Active Point
OFF
ON
OSC Block to
FF Reset
HIGH
LOW
Automotive NJM2374A-Z
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-Ver.2013-08-26
■TYPICAL APPLICATIONS
Step-Down Converter
1
NJM2374A
43
2
CT
470pF
8
6
7
D1
R2 3.6kΩ
L1 220μH
5
R1
1.2kΩ
RSC
0.22Ω
CIN
100μF
COUT
470μF
VIN=25V
VOUT=5V
In the case of Step-Down Conversion with the internal power transistor,
the Output Voltage must be set lower than 6V.
Step-Up Converter
1
NJM2374A
43
2
RC
180Ω
CT
1500pF
8
6
7
D1
R2
46kΩ
L1 180μH
5
R1
2kΩ
RSC
0.22Ω
CIN
100μF
COUT
150μF
VIN=14V VOUT=30V
Inverting Converter
1
NJM2374A
43
2
CT
680pF
8
6
7
D1
R2 1.2kΩ
L1
100μH
5
R1
3.6kΩ
RSC
0.22Ω
CIN
100μF
COUT
1000μF
VIN=5V
VOUT=-5V
In the case of Inverting Conversion with the internal power transistor,
the Output Voltage must be set lower than -6V.
Use schottky diode for D1.
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utomotive NJM2374A-Z
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Ver.2013-08-26
Step-Down Converter (High Current)
Step-Up Converter (High Current)
Use schottky diode for D1.
■Power Dissipation vs. Ambient Temperature
1
NJM2374A
4 3
2
CT
330pF
8
6
7
D1
R2 70kΩ
L1 33μF
5
R1
10kΩ
RSC
0.05Ω
CIN
300μF
COUT
300μF
VIN=20V
VOUT=10V
RBE
75Ω
RBC
300Ω
2SA1010
1
NJM2374A
4 3
2
RC2
680Ω
CT
330pF
8
6
7
D1
R2
46kΩ
L1 22μH
5
R1
10kΩ
RSC
0.075Ω
CIN
940μF
COUT
940μF
VIN=5V VOUT=7V
RC1
100Ω
2SC3255
RBE
220Ω
0
100
200
300
400
500
600
700
800
-
40
-
20
0
20
40
60
80
100
120
140
0
100
200
300
400
500
600
700
800
-
40
-
20
0
20
40
60
80
100
120
140
NJM2374AM-Z (Tj max=150°C)
Mounted on the PCB "EIA/JEDEC (114.3×76.2×1.6mm, 4 layers, FR-4)"
NJM2374AM-Z (Tj max=150°C)
Mounted on the PCB "EIA/JEDEC (114.3×76.2×1.6mm, 2 layers, FR-4)"
Automotive NJM2374A-Z
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-Ver.2013-08-26
■TIPICAL CHARACTERISTICS
Operating Current vs. Temperature
[CT=1nF,Sl=V+=5V,IN+=1.5V,Es=GND]
0
1
2
3
4
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Operating Current Icc [mA]
Charge Current vs. Temperature
[V+=5V]
12
14
16
18
20
22
24
26
28
30
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Charge Current Ichg [μA]
Discharge to ChargeCurrent Ratio vs.
Temperature [Sl=V+=5V]
0
2
4
6
8
10
12
14
16
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Discharge to ChargeCurrent Ratio
Peak Current Sense Voltage vs. Temperature
[V+=5V , Ichg=Idis]
200
250
300
350
400
450
500
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Peak Current Sense Voltage
Vipk(mV)
Saturation Voltage 1 vs. Temperature
[V+=5V,Cs=Cd,Isw=0.7A]
0.0
0.2
0.4
0.6
0.8
1.0
1.2
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Saturation Voltage 1 Vsat1 [V]
100
120
140
160
180
200
220
240
260
280
300
-
50
-
2
5
0 2
5
50 7
5
100 12
5
150
Discharge Current vs. Temperature
(V+=5V)
A
mbient Temperatur
e
[℃]
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utomotive NJM2374A-Z
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Ver.2013-08-26
■TIPICAL CHARACTERISTICS
Saturation Voltage 2 vs. Temperature
[V+=5V,Isw=0.7A,Ic(driver)=50mA,(Forced β≒14)]
0.0
0.2
0.4
0.6
0.8
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Saturation Voltage 2 Vsat2 [V]
Collector Off-State Current vs. Temperature
[V+=5V,VCE=40V]
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Collector Off-State Current IC(OFF) [uA]
Threshold Voltage vs. Temperature
[V+=5V]
1.22
1.24
1.26
1.28
1.30
-50 -25 0 25 50 75 100 125 150
Ambient Tem perature [℃]
Threshold Voltage Vth［Ｖ］
Input Bias Current vs. Temperature
[V+=5V,IN+=5V]
0
50
100
150
200
250
300
350
400
-50 -25 0 25 50 75 100 125 150
Ambient Temperature [℃]
Input Bias Current IIB [ｎA]
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■TIPICAL CHARACTERISTICS
[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.
Operating Current vs. Operating Voltage
(CT=1nF,SI=V+,IN+>Vth,ES=GND,Ta=25°C)
0
1
2
3
4
0 5 10 15 20 25 30 35 40
Operating Voltage V+ (V)
Operating Current ICC (mA)
Oscillator Frequency vs. Timing Capacitor
(V+=5V,SI=V+,Pin5=GND,Ta=25°C)
1
10
100
1000
100 1000 10000
Timing Capacitor CT (pF)
Oscillator Frequency
fOSC (kHz)
Saturation Voltage 1 vs. Collector Current
(V+=5V,CS=CD,Ta=25°C)
0
0.5
1
1.5
2
0 0.5 1 1.5 2
Collector Current IC (A)
Saturation Voltage 1 Vsat1 (V)
Switch ON/OFF Time vs. Timing Capacitor
(V+=5V,SI=V+,Pin5=GND,Ta=25°C)
1
10
100
1000
100 1000 10000
Timing Capacitor CT (pF)
Switch ON/OFF Time
tON / tOFF (μS)
tON
tOFF
Saturation Voltage 2 vs. Collector Current
(V+=5V,Ic(driver)=50mA,β=14,Ta=25°C)
0
0.5
1
1.5
2
00.511.52
Collector Current IC (A)
Saturation Voltage 2 Vsat2 (V)
