NJW4150
-
1
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Ver.2012-08-03
Internal 34V MOSFET Switching Regulator IC for Buck Converter
GENERAL DESCRIPTION ■ PACKAGE OUTLINE
FEATURES
Absolute Maximum Rating 42V
Operating Voltage Range 6V to 34V
Switching Current 450mA min.
PWM switching control
Applicable for Ceramic Capacitor (MLCC)
Oscillation Frequency 1MHz typ. (A ver.)
Soft Start Function 4ms typ.
Over Current and Thermal Shutdown Protection
Standby Function
Package Outline NJW4150RB1 : MSOP8 (TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
■ PIN CONFIGURATION
The NJW4150 is a switching regulator IC for buck converter with
34V, 450mA MOSFET. It corresponds to high frequency oscillating,
wide input voltage and Low ESR Output Capacitor (MLCC).
Therefore, the NJW4150 can realize downsizing of application
s
with a few external parts.
Also, it has a soft start function, over current protection and
thermal shutdown circuit.
It is suitable for power supply circuit of Car Accessory, Offic
e
A
utomation Equipment, Industrial Instrument and so on.
PIN FUNCTION
1. SW
2. N.C.
3. V+
4. ON/OFF
5. FB
6. IN-
7. N.C.
8. GND
NJW4150RB1
1 8
2 7
3 6
4 5
NJW4150RB1
(MSOP8 (TVSP8))
NJW4150
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■ BLOCK DIAGRAM
Buffer
Soft Start
1.0V
IN-
V+
PWM
ER⋅AMP
GND
TSD
Standby
ON/OFF
ON/OFF
High: ON
Low : OFF
(Standby)
OCP
Pulse by Pulse
UVLO
SW
Vref
FB
OSC
Low Frequency
Control
PRODUCT VERSION
PART NUMBER Oscillation Frequency
NJW4150RB1-A 1,000kHz
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Supply Voltage V+ +42 V
SW pin Voltage VSW +42 V
IN- pin Voltage VIN- -0.3 to +6 V
ON/OFF pin Voltage VON/OFF +42 V
Power Dissipation PD 580 (*1)
780 (*2) mW
Junction Temperature Range Tj -40 to +150 °C
Operating Temperature Range Topr -40 to +85 °C
Storage Temperature Range Tstg -40 to +150 °C
(*1): Mounted on glass epoxy board based on EIA/JEDEC. (76.2mm × 114.3mm × 1.6mm: 2 Layers FR-4)
(*2): Mounted on glass epoxy board based on EIA/JEDEC.
(76.2 mm× 114.3 mm× 1.6mm: 4 Layers FR-4, Internal foil area: 74.2 × 74.2mm)
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Operating Voltage V+ 6 – 34 V
NJW4150
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Ver.2012-08-03
ELECTRICAL CHARACTERISTICS (V
+=VON/OFF=24V, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage VT_ON V
+ = L → H 5.6 5.8 6.0 V
OFF Threshold Voltage VT_OFF V
+ = H → L 5.4 5.6 5.8 V
Hysteresis Voltage VHYS 150 200 – mV
Soft Start Block
Soft Start Time TSS V
B=0.95V 2 4 8 ms
Oscillator Block
Oscillation Frequency fOSC A version
VIN-=0.9V, VFB=0.5V 900 1,000 1,100 kHz
Oscillation Frequency
OCP operates fOSC_LIM V
IN-=0V, VFB=0.5V – 333 – kHz
Oscillate Supply Voltage
Fluctuations fDV V
+=6V to 34V – 1 – %
Oscillate Temperature
Fluctuations fDT Ta=- 40 °C to +85°C – 5 – %
Error Amplifier Block
Reference Voltage VB -1.0% 1.00 +1.0% V
Input Bias Current IB -0.1 – 0.1
µA
PWM Comparator Block
Maximum Duty Cycle MAXDUTY V
IN-=0.9V 100 – – %
Output Block
Output ON Resistance RON I
SW=300mA – 1.6 1.8
Ω
Switching Current Limit ILIM 450 600 750 mA
SW Leak Current ILEAK VON/OFF=0V, V+=42V,
VSW=0V – – 1
µA
ON/OFF Block
ON Control Voltage VON V
ON/OFF= L → H 1.6 – V+ V
OFF Control Voltage VOFF V
ON/OFF= H → L 0 – 0.3 V
General Characteristic
Quiescent Current IDD RL=No Load,
VIN-= 0.9V, VFB=0.5V – 2.3 2.7 mA
Standby Current IDD_STB V
ON/OFF=0V – – 40
µA
NJW4150
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TYPICAL APPLICATIONS
ON/OFF
V+
VOUT
V+
FB IN-
SW
L
GND
COUT
CIN
SBD
NJW4150
CNF R
NF
R2
R1
CFB
ON/OFF
High: ON
Low: OFF
(Standby)
NJW4150
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Ver.2012-08-03
■ TYPICAL CHARACTERISTICS
900
950
1000
1050
1100
0 10203040
Oscillation Frequency fosc (kHz)
Operating Voltage V+ (V)
Oscillation Frequency vs. Operating Voltage
(Ta=25oC)
450
500
550
600
650
700
750
0 10203040
Switching Current Limit ILIM (mA)
Operating Voltage V+ (V)
Switching Current Limit vs. Operating Voltage
(Ta=25oC)
2
3
4
5
6
7
8
0 10203040
Soft Start Time Tss (ms)
Operating Voltahe V+ (V)
Soft Start Time vs. Operating Voltage
(VB=0.95V, Ta=25oC)
0
1
2
3
4
0 10203040
Quiescent Current IDD (mA)
Operating Voltage V+ (V)
Quiescent Current vs. Operating Voltage
(RL=No Load, VIN-=0.5V, Ta=25oC)
0
15
30
45
60
0
45
90
135
180
0.1 1 10 100 1000 10000
Error Amplifier Block
Voltage Gain, Phase vs. Frequency
(V+=24V, Gain=40dB, Ta=25 oC)
Phase Φ (deg)
Frequency f (kHz)
Voltage Gain Av (dB)
Phase
Gain
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■ TYPICAL CHARACTERISTICS
900
950
1000
1050
1100
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Oscillator Frequency fOSC (kHz)
Oscillator Frequency vs. Temperature
(V+=24V)
450
500
550
600
650
700
750
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Switching Current Limit ILIM (mA)
Switching Current Limit vs. Temperature
(V+=24V)
2
3
4
5
6
7
8
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Soft Start Time Tss (ms)
Soft Start Time vs. Temperature
(V+=24V, VB=0.95V)
0.99
0.995
1
1.005
1.01
-50 -25 0 25 50 75 100 125
Ambient Temperature Ta (oC)
Reference Voltage VB (V)
Reference Voltage vs. Temperature
(V+=24V)
0
0.5
1
1.5
2
2.5
3
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Output ON Resistance RON (Ω)
Output ON Resistance vs. Temperature
(ISW=300mA)
V+=24V,34V
V+=6V
0
0.02
0.04
0.06
0.08
0.1
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
SW Leak Current ILEAKH (µA)
SW Leak Current vs. Temperature
(V+=42V, VON/OFF=0V, VSW=0V)
NJW4150
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■ TYPICAL CHARACTERISTICS
0
1
2
3
4
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Quiescent Current IDD (mA)
Quiescent Current vs. Temperature
(RL= No Load, VIN-=0.5V)
V+=6V V+=24V
V+=34V
0
10
20
30
40
50
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Standby Current IDD_STB (µA)
Standby Current vs. Temperature
(VON/OFF=0V)
V+=6V
V+=24V
V+=34V
5.4
5.5
5.6
5.7
5.8
5.9
6
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Threshold Voltage (V)
Under Voltage Lockout Block
vs. Temperature
VT_OFF
VT_ON
NJW4150
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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.
