Document
NJW4160
Switching Regulator IC for Buck Converter
External MOSFET driving
GENERAL DESCRIPTION
The NJW4160 is a MOSFET Drive switching regulator IC for Buck Converter that operates wide input range from 3.0V to 35V. It can provide large current application because of built-in highly effective Pch MOSFET drive circuit.
Built-in pulse-by-pulse current detecting type over current protection limits the output current at over load.
It is suitable for logic voltage generation from high voltage that Car Accessory, Office Automation Equipment, Industrial Instrument and so on.
■ PACKAGE OUTLINE
NJW4160R (MSOP8(VSP8))
NJW4160M (DMP8)
FEATURES Pch MOSFET Driving Wide Operating Voltage Range PWM Control Wide Oscillating Frequency Over Current Protection UVLO (Under Voltage Lockout) Standby Function Package Outline
Driving Voltage V+-5.35V(typ.) 3V to 35V 50kHz to 1MHz
NJW4160M: DMP8 NJW4160R: MSOP8(VSP8)
*MEETJEDEC MO-187-DA
PIN CONFIGURATION
1 2 3 4
NJW4160R NJW4160M
8 7 6 5
PIN FUNCTION 1. OUT 2. SI 3. V+ 4. EN 5. IN6. FB 7. CT 8. GND
Ver.2014-04-01
-1-
NJW4160
BLOCK DIAGRAM
V+ SI
ON/OFF
EN
Enable Control
VIPK
Low Frequency Control
OSC
Pulse by Pulse
5V Reg.
Driver
OUT
Vref 0.8V Error AMP
PWM Comparator
IN- FB CT
GND
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER Supply Voltage OUT pin Voltage EN pin sink Current IN- pin Voltage CT pin Voltage
Power Dissipation
Operating Temperature Range Storage Temperature Range
SYMBOL V+ VOUT IEN VINVCT
PD
Topr Tstg
MAXIMUM RATINGS
+40 V+-6 to V+
500 +6 +6 (*1) MSOP8(VSP8) : 595 (*2) DMP8: 530 (*2) -40 to +85
-40 to +150
UNIT V V A V V
mW
C C
(*1): When Supply voltage is less than +6V, the absolute maximum voltage is equal to the Supply voltage.
(*2): Mounted on glass epoxy board based on EIA/JEDEC. (76.2 114.3 1.6mm: 2-Layers)
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage Timing Capacitor Oscillating Frequency
SYMBOL
V+
CT fOSC
MIN.
3 120 50
TYP.
MAX.
UNIT
– 35 V
–
3,300
pF
–
1,000
kHz
-2-
Ver.2014-04-01
NJW4160
ELECTRICAL CHARACTERISTICS
(Unless otherwise noted, V+=12V, VEN is connected to V+ via 200k pull-up, CT=470pF, Ta=25 C)
PARAMETER
SYMBOL
TEST CONDITION
MIN. TYP. MAX. UNIT
Oscillator Block
Oscillation Frequency
Charge Current
Discharge Current
Voltage amplitude
Frequency Supply Voltage Deviation Frequency Temperature Deviation Oscillation Frequency (Low Frequency Control)
fOSC Ichg Idis VOSC
fDV
CT=470pF V+=3V to 35V
fDT Ta=-40 C to +85 C
fOSC_LOW VIN-=0.3V, VFB=0.7V
Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth
Output Source Current
Output Sink Current
VB IB AV GB
IOM+ VFB=1V, VIN-=0.7V
IOM- VFB=1V, VIN-=0.9V
PWM Comparate Block Input Threshold Voltage (FB pin)
Maximum Duty Cycle
VT_0 VT_50
MAXDUTY
Duty=0%, VIN-=0.6V Duty=50%, VIN-=0.6V
VFB=1.2V
Current Limit Detection Block Current Limit Detection Voltage Delay Time
Output Block Output High Level ON Resistance Output Low Level ON Resistanc.