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PDF NJW4131 Data sheet ( Hoja de datos )
| Número de pieza | NJW4131 | |
| Descripción | Switching Regulator IC | |
| Fabricantes | New Japan Radio | |
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NJW4131
Switching Regulator IC for Boost Converter
w/ 40V/1.4A or 40V/1A MOSFET
GENERAL DESCRIPTION
The NJW4131 is a boost converter with 40V/1.4A or 40V/1A
MOSFET. It corresponds to high oscillating frequency, and Low ESR
Output Capacitor (MLCC) within wide input range from 4.0V to 35V.
Therefore, the NJW4131 can realize downsizing of an application
with a few external parts.
Also, it has a soft start function, an over current protection and a
thermal shutdown circuit.
It is suitable for power supply to a Car Accessory, Office Automation
equipment, Industrial Instrument, LED and so on.
■ PACKAGE OUTLINE
NJW4131GM1-A
(HSOP8)
FEATURES
Output Switch Voltage
40V max.
Wide Operating Voltage Range 4V to 35V
Switching Current
1.4A (min.) @ A version
1.0A (min.) @ B version
PWM Control
Wide Oscillation Frequency
300kHz to 1MHz
Soft-Start Function
4ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection / Thermal Shutdown Protection
Standby Function
Package Outline
NJW4131GM1: HSOP8
NJW4131R:
MSOP8(VSP8)*
*MEET JEDEC MO-187-DA
NJW4131R-B
(MSOP8 (VSP8))
PRODUCT CLASSFICATION
PART NUMBER VERSION
NJW4131GM1-A
NJW4131R-B
A
B
SWITCHING
CURRENT LIMIT
(MIN.)
1.4A
1.0A
PACKAGE
HSOP8
MSOP8(VSP8)
OPERATING
TEMPERATURE
RANGE
-40°C to +85°C
-40°C to +85°C
Ver.2012-08-03
-1-
1 page  
NJW4131
TYPICAL APPLICATIONS
VIN
ON/OFF
High: ON
Low: OFF
(Standby)
CIN1
RT
L
SBD
COUT
CIN2
4321
RT V+ ON/OFF SW
NJW4131
IN- FB AGND PGND
5678
CFB
RFB
V OUT
R2
R1
RNF
CNF
Ver.2012-08-03
-5-
5 Page 
NJW4131 ApplicationNJMWan4u13a1l
Description of Block Features (Continued)
2. Additional and Protection Functions / Features
Technical Information
Under Voltage Lockout (UVLO)
The UVLO circuit operating is released above V+=3.9V(typ.) and IC operation starts. When power supply voltage
is low, IC does not operate because the UVLO circuit operates. There is 100mV width hysteresis voltage at rise and
decay of power supply voltage. Hysteresis prevents the malfunction at the time of UVLO operating and releasing.
Soft Start Function (Soft Start)
The output voltage of the converter gradually rises to a set value by the soft start function. The soft start time is
4ms (typ). It is defined with the time of the error amplifier reference voltage becoming from 0V to 0.95V. The soft start
circuit operates after the release UVLO and/or recovery from thermal shutdown. The operating frequency is
controlled with a low frequency, approximately 40% of the set value by the timing resistor, until voltage of the IN- pin
becomes approximately 0.4V.
1.0V
V ref ,
IN- pin Voltage
Max Duty setting
FB pin Voltage
OSC Waveform
SW pin
ON
OFF
UVLO(3.9V typ.) Release,
Standby,
Recover from Thermal
Shutdow n
Low Frequency
Control
VIN-=approx 0.4V
Soft Start time: Tss=4ms(typ.) to VB=0.95V
Soft Start effective period to VB=1.0V
Fig. 2. Startup Timing Chart
Steady
Operaton
Ver.2012-08-03
- 11 -
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet NJW4131.PDF ] | |
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