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)
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
NJW4128GM1-A
NJW4128GM1-B
Version
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-
NJW4128
PIN CONFIGURATION
1
2
3
4
8
7
6
5
Exposed PAD on
backside connect to GND
PIN FUNCTION
1. SW
2. SW
3. GND
4. PG
5. IN-
6. EN/SYNC
7. V
+
8. V
+
NJW4128GM1-A
NJW4128GM1-B
BLOCK DIAGRAM
V
+
SLOPE
COMP.
UVLO
CURRENT
SENSE
OCP
Enable
(Standby)
100k
Ω
SYNC
OSC
S Q
R
TSD
Buffer
EN/SYNC
High: ON
Low : OFF(Standby)
SW
PWM
IN-
ER
⋅
AMP
Soft Start
Vref
0.8V
Pow er Good
Control Logic
PG
GND
-2-
Ver.2012-12-04
NJW4128
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
V
+
V
+
- SW pin Voltage
V
V-SW
EN/SYNC pin Voltage
V
EN/SYNC
IN- pin Voltage
V
IN-
Power Good pin Voltage (*1)
V
PG
(Ta=25°C)
UNIT
V
V
V
V
V
MAXIMUM RATINGS
+45
+45
+45
-0.3 to +6
-0.3 to +6
HSOP8
790 (*1)
Power Dissipation
P
D
mW
2,500 (*2)
Junction Temperature Range
Tj
-40 to +150
°C
Operating Temperature Range
T
opr
-40 to +85
°C
Storage Temperature Range
T
stg
-40 to +150
°C
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers)
(For 4Layers: Applying 74.2×74.2mm inner Cu area and a thermal via hall to a board based on JEDEC standard JESD51-5)
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Supply Voltage
V
+
Power Good pin Voltage
V
PG
External Clock Input Range
A version
f
SYNC
B version
MIN.
4.5
0
440
280
TYP.
–
–
–
–
MAX.
40
5.5
600
500
UNIT
V
V
kHz
Ver.2012-12-04
-3-
NJW4128
ELECTRICAL CHARACTERISTICS
PARAMETER
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
Soft Start Block
Soft Start Time
Oscillator Block
Oscillation Frequency
Oscillation Frequency
deviation (Supply voltage)
Oscillation Frequency
deviation (Temperature)
Error Amplifier Block
Reference Voltage
Input Bias Current
PWM Comparate Block
Maximum Duty Cycle
Minimum ON Time1
(Use Built-in Oscillator)
Minimum ON Time2
(Use Ext CLK)
OCP Block
COOL DOWN Time
Output Block
Output ON Resistance
Switching Current Limit
SW Leak Current
f
OSC
f
DV
f
DT
A version, V
IN-
=0.7V
B version, V
IN-
=0.7V
V
+
=4.5V to 40V
Ta=-40°C to +85°C
405
270
–
–
450
300
1
5
495
330
–
–
kHz
kHz
%
%
SYMBOL
(Unless otherwise noted, V
+
=V
EN./SYNC
=12V, Ta=25°C)
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
V
T_ON
V
T_OFF
V
HYS
V
+
= L
→
H
V
+
= H
→
L
4.2
4.1
70
4.4
4.3
90
4.5
4.4
–
V
V
mV
T
SS
V
B
=0.75V
2
4
8
ms
V
B
I
B
-1.0%
-0.1
0.8
–
+1.0%
+0.1
V
µA
M
AX
D
UTY
t
ON-min1
t
ON-min2
V
IN-
=0.7V
A version
B version
A version, f
SYNC
=500kHz
B version, f
SYNC
=400kHz
88
–
–
–
–
92
220
250
150
170
–
300
340
220
250
%
ns
ns
ns
ns
t
COOL
–
25
–
ms
R
ON
I
LIM
I
LEAK
I
SW
=2.5A
V
EN/SYNC
=0V, V
+
=45V, V
SW
=0V
–
3.6
–
0.15
4.6
–
0.3
5.5
4
Ω
A
µA
-4-
Ver.2012-12-04
NJW4128
ELECTRICAL CHARACTERISTICS
PARAMETER
Standby Control / Sync Block
EN/SYNC pin
High Threshold Voltage
EN/SYNC pin
Low Threshold Voltage
Input Bias Current
(EN/SYNC pin)
Power Good Block
High Level Detection Voltage
High Level Detection Voltage
Hysterisis Region
Power Good ON Resistance
Leak Current at OFF State
General Characteristics
Quiescent Current
Standby Current
I
DD
I
DD_STB
A version,
R
L
=no load, V
IN-
=0.7V
B version,
R
L
=no load, V
IN-
=0.7V
V
EN/SYNC
=0V
–
–
–
4
3.5
–
4.7
4.2
3
mA
mA
µA
SYMBOL
(Unless otherwise noted, V
+
=V
EN/SYNC
=12V, Ta=25°C)
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
V
THH_EN/SYNC
V
EN/SYNC
= L
→
H
1.6
0
–
–
–
170
V
+
0.5
250
V
V
µA
V
THL_EN/SYNC
V
EN/SYNC
= H
→
L
I
EN
V
EN/SYNC
=12V
V
THH_PG
V
THL_PG
V
HYS_PG
R
ON_PG
I
LEAK_PG
Measured at IN- pin
Measured at IN- pin
I
PG
=10mA
V
PG
=6V
105
85
–
–
–
110
90
2
37
–
115
95
–
50
0.1
%
%
%
Ω
µA
Ver.2012-12-04
-5-
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
