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PDF NJW4153 Data sheet ( Hoja de datos )
| Número de pieza | NJW4153 | |
| Descripción | Automotive Switching Regulator IC | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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Automotive NJW4153
Switching Regulator IC for Buck Converter
Current Mode Control w/ 40V/1A MOSFET
GENERAL DESCRIPTION
The NJW4153 is a buck converter with 40V/1A MOSFET. It
corresponds to high oscillating frequency, and Low ESR Output
Capacitor (MLCC) within wide input range from 4.6V to 40V.
Therefore, the NJW4153 can realize downsizing of applications
with a few external parts so that adopts current mode control.
Also, it has a soft start function, an over current protection and a
thermal shutdown circuit.
It is suitable for power supply circuit of Micro Processor, DSP
and so on that need fast transient response.
■ PACKAGE OUTLINE
NJW4153U2-A-T1
FEATURES
Current mode Control
Maximum Rating Input Voltage 45V
Wide Operating Voltage Range 4.6V to 40V
Switching Current
1.4A min.
PWM Control
Built-in Compensation Circuit
Correspond to Ceramic Capacitor (MLCC)
Oscillating Frequency
1MHz typ.
Soft Start Function
4ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection (Hiccup type)
Thermal Shutdown Protection
Standby Function
Package Outline
NJW4153U2-A-T1 : SOT-89-5
Ver.2014-05-12
-1-
1 page  
Automotive NJW4153
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
(Unless otherwise noted, V+=VON/OFF=12V, Ta=25C)
TEST CONDITION
MIN. TYP. MAX. UNIT
ON/OFF Block
ON Control Voltage
OFF Control Voltage
Pull-down Resistance
General Characteristics
Quiescent Current
Standby Current
VON
VOFF
RPD
VON/OFF= L → H
VON/OFF= L → H,
Ta= -40°C to +125°C
VON/OFF= H → L
VON/OFF= H → L ,
Ta= -40°C to +125°C
1.6 – V+
1.6 - V+ V
0 – 0.5
V
0 - 0.4
– 450 – k
IDD
IDD_STB
RL=no load, VIN-=0.7V
RL= no load, VIN-=0.7V
Ta= -40°C to +125°C
VON/OFF=0V
VON/OFF=0V, Ta= -40°C to +125°C
–
-
–
-
3.9 4.4
mA
- 4.4
–1
- 1 A
TYPICALAPPLICATIONS
VIN
CIN
V+
SW
NJW4153
ON/OFF GND IN-
ON/OFF
High: ON
Low: OFF
(Standby)
L
SBD
CFB
COUT
V OUT
R2
R1
Ver.2014-05-12
-5-
5 Page 
NJW4153AuAtpopmlioctaitvieonNJMWan4u15a3l
Technical Information
Description of Block Features (Continued)
2. Additional and Protection Functions / Features
Under Voltage Lockout (UVLO)
The UVLO circuit operating is released above V+=4.45V(typ.) and IC operation starts. When power supply voltage
is low, IC does not operate because the UVLO circuit operates. There is 100mV(typ.) 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 0.75V. The soft
start circuit operates after the release UVLO and/or recovery from thermal shutdown. The operating frequency is
controlled with a low frequency 370kHz, until voltage or the IN- pin becomes approximately 0.65V.
0.8V
V ref ,
IN- pin Voltage
SW pin
ON
OFF
UVLO(4.45V typ.) Release,
Standby,
Recover from Thermal
Shutdow n
OSC Waveform
Low Frequency
Control
VIN-=approx 0.65V
Soft Start time: Tss=4ms(typ.) to VB=0.75V
Soft Start effective period to VB=0.8V
Fig. 1. Startup Timing Chart
Steady
Operaton
Ver.2014-05-12
- 11 -
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet NJW4153.PDF ] | |
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