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PDF NJW4155 Data sheet ( Hoja de datos )
| Número de pieza | NJW4155 | |
| Descripción | Internal 1.8A MOSFET Switching Regulator IC | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJW4155
Current Mode Control
Internal 1.8A MOSFET Switching Regulator IC for Buck Converter
GENERAL DESCRIPTION
The NJW4155 is a buck converter with 40V/1.8A MOSFET. It
corresponds to high oscillating frequency, and Low ESR Output
Capacitor (MLCC) within wide input range from 4.5V to 40V.
Therefore, the NJW4155 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.
FEATURES
Current Mode Control
External Clock Synchronization
Wide Operating Voltage Range 4.5V to 40V
Switching Current
2.7A min.
PWM Control
Built-in Compensation Circuit
Correspond to Ceramic Capacitor (MLCC)
Oscillating Frequency
450kHz typ. (A, C 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 (NJW4155GM1 only)
Standby Function
Package Outline
NJW4155GM1 : HSOP8
NJW4155DL3 : TO-252-5
■ PACKAGE OUTLINE
NJW4155GM1
NJW4155DL3
Ver.2015-11-13
-1-
1 page  
NJW4155
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
(Unless otherwise noted, V+=VEN./SYNC=12V, Ta=25 C)
TEST CONDITION
MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
VT_ON
VT_OFF
VHYS
V+= L → H
V+= H → L
Soft Start Block
Soft Start Time
TSS VB=0.75V
Oscillator Block
Oscillation Frequency
Oscillation Frequency
deviation (Supply voltage)
Oscillation Frequency
deviation (Temperature)
fOSC
A, C version, VIN-=0.7V
B version, VIN-=0.7V
fDV V+=4.5V to 40V
fDT Ta=-40 C to +85 C
Error Amplifier Block
Reference Voltage
Input Bias Current
VB
IB
PWM Comparate Block
Maximum Duty Cycle
Minimum ON Time1
(Use Built-in Oscillator)
Minimum ON Time2
(Use Ext CLK)
MAXDUTY
tON-min1
tON-min2
VIN-=0.7V
A, C version
B version
A, C version, fSYNC=500kHz
B version, fSYNC=400kHz
OCP Block
COOL DOWN Time
tCOOL
Output Block
Output ON Resistance
Switching Current Limit
SW Leak Current
RON
ILIM
ILEAK
ISW=1.5A
VEN/SYNC=0V, V+=45V, VSW=0V
4.2 4.4 4.5 V
4.1 4.3 4.4 V
70 90
– mV
2 4 8 ms
405 450 495 kHz
270 300 330 kHz
– 1 –%
– 5 –%
-1.0% 0.8 +1.0% V
-0.1 – +0.1 A
92 95.5
–
%
– 150 200 ns
– 215 290 ns
– 100 140 ns
– 145 200 ns
– 75 – ms
– 0.2 0.4
2.7 3.4 4.0 A
––3A
Ver.2015-11-13
-5-
5 Page 
TYPICAL CHARACTERISTICS (A, C version)
Oscillation Frequency vs. Supply Voltage
470 (A, C ver., VIN-=0.7V, Ta=25ºC)
465
460
455
450
445
440
435
430
0
10 20 30
Supply Voltage V+ (V)
40
Oscillation Frequency vs Temperature
500 (A, C ver., V+=12V, VIN-=0.7V)
490
480
470
460
450
440
430
420
410
400
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (ºC)
Minimum ON Time1 vs. Temperature
(A, C ver., V+=12V)
200
190
180
170
160
150
140
130
120
110
100
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (ºC)
Ver.2015-11-13
NJW4155
Quiescent Current vs. Supply Voltage
5 (A, C ver, RL=no load, VIN-=0.7V, Ta=25ºC)
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0 10 20 30 40
Supply Voltage V+ (V)
Maximum Duty Cycle vs. Temperature
100 (A, C ver., V+=12V, VIN-=0.7V)
99
98
97
96
95
94
93
92
91
90
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (ºC)
Quiescent Current vs. Temperature
5 (A, C ver., RL=no load, VIN-=0.7V)
4.5
4
3.5
3
2.5 V+=12V
2 V+=40V
1.5 V+=4.5V
1
0.5
0
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (ºC)
- 11 -
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet NJW4155.PDF ] | |
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