NJW4158
-
1
-
Ver.2012-08-06
Switching Regulator IC for Buck Converter
Current Mode Control w/ 40V/8A MOSFET
GENERAL DESCRIPTION ■ PACKAGE OUTLINE
FEATURES
Current Mode Control
Wide Input Range: 6V to 40V
Switching Current 10.5A min.
PWM Control
Built-in Compensation Circuit
Oscillating Frequency: 150kHz typ.
Soft Start Function 10ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection
Thermal Shutdown Function
Package Outline TO-220F-4pin
BLOCK DIAGRAM
V
+
IN-
ER⋅AMP
Buf f er
OCP
CURRENT
SENSE
TSD
VrefSof t Start
UV LO
SLOPE
COMP.
0.8V
S Q
R
OSC
GND
SW
PWM
Low Frequency
Con tr o l
Drain
Source
The NJW4158 is a current mode controlled buck converter with
40V/8A MOSFET that operates wide input range from 6V to 35V.
The NJW4158 can realize a buck converter with minimal external
components that it includes compensation circuit.
The NJW4158 is able to stable startup by soft start function.
A
lso, it has over current protection and thermal shutdown circuit.
It is suitable for supplying power to an Office Automation
Equipment, Industrial Instrument, Amusement, Wireless Base
Station Applications and so on.
PIN CONFIGURATION
1. V+
2. SW
3. GND
4. IN-
NJW4158F NJW4158FL
1 2 3 4
NJW4158
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2
-Ver.2012-08-06
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Supply Voltage V+ +45 V
Drain – Source pin Voltage VDSS -50 V
IN- pin Voltage VIN- -0.3 to +6 V
Power Dissipation PD 2.1 (Device itself) W
Junction Temperature Range Tj -40 to +150 °C
Operating Temperature Range Topr -40 to +85 °C
Storage Temperature Range Tstg -40 to +150 °C
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Supply Voltage V+ 6 12 40 V
IN- pin Voltage VIN- 0 – 5.5 V
THERMAL CHARACTERISTICS
PARAMETER SYMBOL THERMAL RESISTANCE UNIT
Junction-to-Ambient Temperature θja 59.5 °C/W
Junction-to-Case ψjt 7.5 °C/W
POWER DISSIPATION vs. AMBIENT TEMPERATURE
0
4
8
12
16
-50 -25 0 25 50 75 100
Ambient Temperature
Ta (oC)
Power Dissipation PD (W)
Power Dissipation vs. Ambient Temperature
(Tj= ~150oC)
θHS=20 oC/W
θHS=10 oC/W
θHS=5 oC/W
Without Heat Sink
Infinity Heat Sink
NJW4158
-
3
-
Ver.2012-08-06
ELECTRICAL CHARACTERISTICS (Unless otherwise noted, V
+=12V, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage VT_ON V
+= L → H 5.2 5.4 5.6 V
OFF Threshold Voltage VT_OFF V
+= H → L 4.4 4.6 4.8 V
Hysteresis Voltage VHYS 400 800 – mV
Soft Start Block
Soft Start Time TSS V
B=0.75V 5 10 20 ms
Oscillator Block
Oscillation Frequency fOSC V
IN-=0.7V 135 150 165 kHz
Oscillation Frequency
(Low Frequency Control) fOSC_LOW V
IN-=0.4V – 50 – kHz
Oscillation Frequency
deviation (Supply voltage) fDV V
+=6V to 40V – 1 – %
Oscillation Frequency
deviation (Temperature) fDT Ta= - 40°C to +85°C – 5 – %
Error Amplifier Block
Reference Voltage VB -1.0% 0.8 +1.0% V
Input Bias Current IB -0.1 – +0.1
µA
PWM Comparate Block
Maximum Duty Cycle MAXDUTY V
IN-=0.7V 85 90 – %
Minimum ON Time TON_min – 660 850 ns
Over Current Protection
Cool Down Time tCOOL – 24 – ms
Output Block
Output ON Resistance RON I
SW=8A – 55 80
mΩ
Switching Current Limit ILIM 10.5 12.5 15 A
Switching Current Limit 2 ILIM2 V
+=30V 10.5 12.5 15 A
Switching Leak Current ILEAK V
+=45V, VSW=0V – – 20
µA
General Characteristics
Quiescent Current IDD R
L=no load, VIN-=0.7V – 7 9.5 mA
NJW4158
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4
-Ver.2012-08-06
MARK SPECIFICATION
1
4158
JRC
2 3 4
Part Number
(Indicating NJW4158F or NJW4158FL)
Logo
Mark Lot
TYPICAL APPLICATIONS
CFB
R2
COUT
L
SBD
NJW4158
VIN
CIN1
R1
VOUT
RFB
1
34
2
VOUT =
R2
R1
+1 x VB [V]
CIN2
*When large current flows, VIN line may be unstable. Therefore, you should put CIN on near IC as much as possible.
NJW4158
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5
-
Ver.2012-08-06
TYPICAL CHARACTERISTICS
Quiescent Current vs. Supply Voltage
(R
L
=no load, V
IN-
=0.7V, Ta=25°C)
0
1
2
3
4
5
6
7
8
9
10
0 10203040
Supply Voltage V
+
(V)
Quiescent Current I
DD
(mA)
Oscillation Frequency vs. Supply Voltage
(V
IN-
=0.7V, Ta=25°C)
135
140
145
150
155
160
165
0 10203040
Supply Voltage V
+
(V)
Oscillation Frequnecny f
OSC
(kHz)
Reference Voltage vs. Supply Voltage
(Ta=25°C)
0.79
0.795
0.8
0.805
0.81
0 10203040
Supply Voltage V
+
(V)
Reference Voltage V
B
(V)
NJW4158
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6
-Ver.2012-08-06
TYPICAL CHARACTERISTICS
Reference Voltage vs. Temperature
(V
+
=12V)
0.79
0.795
0.8
0.805
0.81
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Reference Voltage V
B
(V)
Oscillation Frequency vs Temperature
(V
+
=12V, V
IN-
=0.7V)
135
140
145
150
155
160
165
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Oscillation Frequency fosc (kHz)
Switching Current Limit vs. Temperature
(V
+
=12V)
8
10
12
14
16
18
20
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Switching Current Limit I
LIM
(A)
Switching Current Limit 2 vs. Temperature
(V
+
=30V)
8
10
12
14
16
18
20
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Switching Current Limit I
LIM2
(A)
Output ON Resistance vs. Temperature
(I
SW
=8A)
0
10
20
30
40
50
60
70
80
90
100
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Output ON Resistance R
ON
(mΩ)
Switching Leak Current vs. Temperature
(V
+
=45V, V
SW
=0V)
0
2
4
6
8
10
12
14
16
18
20
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Switching Leak Current I
LEAK
(µA)
NJW4158
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7
-
Ver.2012-08-06
TYPICAL CHARACTERISTICS
Minimum ON Time vs. Temperature
(V
+
=12V)
0
100
200
300
400
500
600
700
800
900
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Minimum ON Time t
ON-min
(ns)
V
+
=40V
V
+
=12V
V
+
=6V
Under Voltage Lockout Voltage vs. Temperature
4.4
4.6
4.8
5
5.2
5.4
5.6
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Threshold Voltage (V)
V
T_ON
V
T_OFF
Maximum Duty Cycle vs. Temperature
(V
+
=12V, V
IN-
=0.7V)
84
86
88
90
92
94
96
98
100
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Maximum Duty Cycle M
AX
D
UTY
(%)
Quiescent Current vs. Temperature
(R
L
=no load, V
IN-
=0.7V)
0
1
2
3
4
5
6
7
8
9
10
-50-250 255075100125150
Ambient Temperature Ta (°C)
Quiescent Current I
DD
(mA)
V
+
=40V
V
+
=12V
V
+
=6V
Soft Start Time vs. Temperature
(V
+
=12V, V
B
=0.75V)
4
6
8
10
12
14
16
18
20
-50-250 255075100125150
Ambient Temperature Ta (°C)
Soft Start Time Tss (ms)
NJW4158
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8
-Ver.2012-08-06
MEMO
[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.
