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PDF NJW4128 Data sheet ( Hoja de datos )
| Número de pieza | NJW4128 | |
| Descripción | Switching Regulator IC | |
| Fabricantes | New Japan Radio | |
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Hay una vista previa y un enlace de descarga de NJW4128 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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NJW4128
Switching Regulator IC for Buck Converter
Current Mode Control w/ 40V/2.5A MOSFET
GENERAL DESCRIPTION
The NJW4128 is a buck converter with 40V/2.5A MOSFET. It
corresponds to high oscillating frequency, and Low ESR Output
Capacitor (MLCC) within wide input range from 4.5V to 40V.
Therefore, the NJW4128 can realize downsizing of applications
with a few external parts so that adopts current mode control.
Also, it has a soft start function, external clock synchronization,
over current protection and thermal shutdown circuit.
It is suitable for supplying power to a Car Accessory, Office
Automation Equipment, Industrial Instrument and so on.
■ PACKAGE OUTLINE
NJW4128GM1
FEATURES
Current Mode Control
External Clock Synchronization
Wide Operating Voltage Range 4.5V to 40V
Switching Current
3.6A min.
PWM Control
Built-in Compensation Circuit
Correspond to Ceramic Capacitor (MLCC)
http://www.DataSheet4U.net/
Oscillating Frequency
450kHz typ. (A ver.)
300kHz typ. (B ver.)
Soft Start Function
4ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection (Hiccup type)
Thermal Shutdown Protection
Power Good Function
Standby Function
Package Outline
NJW4128GM1 : HSOP8
PRODUCT CLASSFICATION
Part Number
Version
NJW4128GM1-A
NJW4128GM1-B
A
B
Oscillation
Frequency
450kHz typ.
300kHz typ.
Power Good
√
√
Package
HSOP8
HSOP8
Operating
Temperature
Range
-40°C to +85°C
-40°C to +85°C
Ver.2012-12-04
-1-
datasheet pdf - http://www.DataSheet4U.net/
1 page  
NJW4128
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
(Unless otherwise noted, V+=VEN/SYNC=12V, Ta=25°C)
TEST CONDITION
MIN. TYP. MAX. UNIT
Standby Control / Sync Block
EN/SYNC pin
High Threshold Voltage
EN/SYNC pin
Low Threshold Voltage
Input Bias Current
(EN/SYNC pin)
VTHH_EN/SYNC VEN/SYNC= L → H
VTHL_EN/SYNC VEN/SYNC= H → L
IEN VEN/SYNC=12V
Power Good Block
High Level Detection Voltage
High Level Detection Voltage
Hysterisis Region
Power Good ON Resistance
Leak Current at OFF State
VTHH_PG
VTHL_PG
VHYS_PG
RON_PG
ILEAK_PG
Measured at IN- pin
Measured at IN- pin
IPG=10mA
VPG=6V
General Characteristics
Quiescent Current
Standby Current
IDD
IDD_STB
A version,
RL=no load, VIN-=0.7V
B version,
RL=no load, VIN-=0.7V
VEN/SYNC=0V
1.6 – V+ V
0 – 0.5 V
– 170 250 µA
105 110 115 %
85 90 95 %
– 2 –%
– 37 50 Ω
– – 0.1 µA
– 4 4.7 mA
– 3.5 4.2 mA
– – 3 µA
http://www.DataSheet4U.net/
Ver.2012-12-04
-5-
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
NJW4128 ApplicationNJMWan4u12a8l
PIN DESCRIPTIONS
PIN NAME
PIN
NUMBER
SW
GND
1
2
3
PG 4
IN- 5
EN/SYNC
V+
Exposed
PAD
6
7
8
–
Technical Information
FUNCTION
Switch Output pin of Power MOSFET
GND pin
Power Good pin. An open drain output that goes high impedance when the IN- pin
voltage is stable around ±10%.
Output Voltage Detecting pin
Connects output voltage through the resistor divider tap to this pin in order to voltage
of the IN- pin become 0.8V.
Standby Control pin
The EN/SYNC pin internally pulls down with 100kΩ. Normal Operation at the time of
High Level. Standby Mode at the time of Low Level or OPEN.
Moreover, it operates by inputting clock signal at the oscillatory frequency that
synchronized with the input signal.
Power Supply pin for Power Line
Connect to GND
http://www.DataSheet4U.net/
Ver.2012-12-04
- 11 -
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet NJW4128.PDF ] | |
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