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PDF NJW4154 Data sheet ( Hoja de datos )
| Número de pieza | NJW4154 | |
| Descripción | Switching Regulator IC | |
| Fabricantes | New Japan Radio | |
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NJW4154
Switching Regulator IC for Buck Converter
Current Mode Control w/ 40V/3A MOSFET
GENERAL DESCRIPTION
The NJW4154 is a buck converter with 40V/3A MOSFET. It
corresponds to high oscillating frequency, and Low ESR Output
Capacitor (MLCC) within wide input range from 4.5V to 40V.
Therefore, the NJW4154 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
NJW4154GM1
NJW4154DL3
FEATURES
Current Mode Control
External Clock Synchronization
Wide Operating Voltage Range 4.5V to 40V
Switching Current
4.5A min.
PWM Control
Built-in Compensation Circuit
Correspond to Ceramic Capacitor (MLCC)
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Oscillating Frequency
300kHz typ. (A ver.)
Soft Start Function
4ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection (Hiccup type)
Thermal Shutdown Protection
Power Good Function (NJW4154GM1 only)
Standby Function
Package Outline
NJW4154GM1 : HSOP8
NJW4154DL3 : TO-252-5
PRODUCT CLASSIFICATION
Part Number
Version
NJW4154GM1-A
NJW4154DL3-A
A
A
Oscillation
Frequency
300kHz typ.
300kHz typ.
Power Good
√
Package
HSOP8
TO-252-5
Operating
Temperature
Range
General Spec.
-40°C to +85°C
General Spec.
-40°C to +85°C
Ver.2013-03-29
-1-
datasheet pdf - http://www.DataSheet4U.net/
1 page  
NJW4154
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 (*6)
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
(*6): Apply only the NJW4154GM1.
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
– 3.5 4.2 mA
– – 3 µA
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Ver.2013-03-29
-5-
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Description of Block Features
1. Basic Functions / Features
NJW4154 ApplicationNJMWan4u15a4l
Technical Information
Error Amplifier Section (ER⋅AMP)
0.8V±1% precise reference voltage is connected to the non-inverted input of this section.
To set the output voltage, connects converter's output to inverted input of this section (IN- pin). If requires output
voltage over 0.8V, inserts resistor divider.
Because the optimized compensation circuit is built-in, the application circuit can be composed of minimum
external parts.
PWM Comparator Section (PWM), Oscillation Circuit Section (OSC)
The NJW4154 uses a constant frequency, current mode step down architecture. The oscillation frequency is
300kHz (typ.) at A version. The PWM signal is output by feedback of output voltage and slope compensation
switching current at the PWM comparator block.
The maximum duty ratio is 93% (typ.).
The minimum ON time is limited to 250nsec (typ.) at using internal oscillator or 170nsec (typ.) at external
synchronization.
The buck converter of ON time is decided the following formula.
[ ]ton
=
VOUT
VIN × fOSC
s
VIN shows input voltage and VOUT shows output voltage.
When the ON time becomes below in tON-min, in order to maintain output voltage at a stable state, change of duty or
pulse skip operation may be performed.
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Power MOSFET (SW Output Section)
The power is stored in the inductor by the switch operation of built-in power MOSFET. The output current is limited
to 4.5A(min.) the overcurrent protection function. In case of step-down converter, the forward direction bias voltage is
generated with inductance current that flows into the external regenerative diode when MOSFET is turned off.
The SW pin allows voltage between the PV+ pin and the SW pin up to +45V. However, you should use an
Schottky diode that has low saturation voltage.
Power Supply, GND pin (V+ and GND)
In line with switching element drive, current flows into the IC according to frequency. If the power supply
impedance provided to the power supply circuit is high, it will not be possible to take advantage of IC performance
due to input voltage fluctuation. Therefore insert a bypass capacitor close to the V+ pin – the GND pin connection in
order to lower high frequency impedance.
Ver.2013-03-29
- 11 -
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet NJW4154.PDF ] | |
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