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.
■
PACKAGE OUTLINE
NJW4155GM1
NJW4155DL3
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
Ver.2015-11-13
-1-
NJW4155
PRODUCT CLASSIFICATION
Part Number
NJW4155GM1-A
NJW4155GM1-B
NJW4155DL3-B
NJW4155GM1-C
Version
A
B
B
C
Oscillation
Frequency
450kHz typ.
300kHz typ.
300kHz typ.
450kHz typ.
Power Good
Package
HSOP8
HSOP8
TO-252-5
HSOP8
(7pin: N.C.)
Operating Temperature
Range
General Spec.
Ta=-40 C to +125 C
General Spec.
Ta=-40 C to +125 C
General Spec.
Ta=-40 C to +125 C
General Spec.
Ta=-40 C to +125 C
PIN CONFIGURATION
SW
SW
GND
PG
1
2
3
4
8
7
6
5
V
+
V
+
SW
SW
1
2
3
4
8
7
6
5
V
+
N.C.
EN/SYNC
IN-
5 EN/SYNC
4 IN-
3
3 GND
2 SW
1 V
+
EN/SYNC GND
IN-
PG
Exposed PAD on
backside connect to GND
Exposed PAD on
backside connect to GND
NJW4155GM1-A
NJW4155GM1-B
NJW4155GM1-C
NJW4155DL3-B
PIN DESCRIPTIONS
PIN NAME
PIN NUMBER
HSOP8 HSOP8 TO-252-5
A ver.
C ver.
B ver.
B ver.
1
1
2
2
2
3
3
3
4
5
4
5
–
4
FUNCTION
SW
GND
PG
IN-
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%.(Only HSOP8 PKG)
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 100k . 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.
Non Connection
Power Supply pin for Power Line
Connect to GND (Only HSOP8 PKG)
EN/SYNC
N.C.
V
+
Exposed
PAD
6
–
7
8
–
6
7
8
–
5
–
1
–
-2-
Ver.2015-11-13
NJW4155
BLOCK DIAGRAM
V
+
SLOPE
COMP.
UVLO
CURRENT
SENSE
OCP
Enable
(Standby)
100k
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
NJW4155GM1 only
PG
GND
Ver.2015-11-13
-3-
NJW4155
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
Power Dissipation
Junction Temperature Range
Operating Temperature Range
Storage Temperature Range
P
D
Tj
T
opr
T
stg
MAXIMUM RATINGS
-0.3½+45
+45
-0.3½+45
-0.3½+6
-0.3½+6
HSOP8
790 (*2)
2,500 (*3)
TO-252-5
1,190 (*4)
3,125 (*3)
-40 to +150
-40 to +125
-50 to +150
(Ta=25°C)
UNIT
V
V
V
V
V
mW
C
C
C
(*1):
Apply only the NJW4155GM1.
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*3): 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 hole to a board based on JEDEC standard JESD51-5)
2
(*4): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard size, 2Layers, Cu area 100mm )
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Supply Voltage
V
+
Power Good pin Voltage (*5)
V
PG
External Clock Input Range
A, C version
f
SYNC
B version
(*5):
Apply only the NJW4155GM1.
MIN.
4.5
0
440
280
TYP.
–
–
–
–
MAX.
40
5.5
600
500
UNIT
V
V
kHz
-4-
Ver.2015-11-13
NJW4155
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, C 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
A
M
AX
D
UTY
t
ON-min1
t
ON-min2
V
IN-
=0.7V
A, C version
B version
A, C version, f
SYNC
=500kHz
B version, f
SYNC
=400kHz
92
–
–
–
–
95.5
150
215
100
145
–
200
290
140
200
%
ns
ns
ns
ns
t
COOL
–
75
–
ms
R
ON
I
LIM
I
LEAK
I
SW
=1.5A
V
EN/SYNC
=0V, V =45V, V
SW
=0V
+
–
2.7
–
0.2
3.4
–
0.4
4.0
3
A
A
Ver.2015-11-13
-5-
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