NJRC NJW4140M

BCD
Process
Series
U
.
D
.
NJW4140
Switching Regulator IC for Boost Converter
„ FEATURES
„ PACKAGE OUTLINE
z Operating Voltage Range 3V to 35V
z Drive Nch MOSFET
(Ciss=3,000pF, Gate voltage 5V max.)
z Oscillation Frequency
50kHz to 1MHz
z PWM Control
z External Synchronous Function
z Over Current Protection
z Built-in OSC Enable Function
z Package Outline
DMP8, VSP8
NJW4140M (DMP8)
NJW4140R (VSP8)
2.9×4.0×1.2mm
+
„ BLOCK DIAGRAM
V
5V
Reg.
ON/OFF
Enable
Control
EN
OSC Enable
Driver
OUT
OSC
PWM
Comparator
Vref
1V
SI
Error AMP
IN-
VIPK
FB
CT
GND
Please note that this device is still under the development
and therefore the specifications are subject to change.
Ver.2010/09/03 1
NJW4140 Typical Application
L miniaturization is possible by the
acceleration of oscillation frequency
MLCC is corresponding
CNF RNF
VIN
CIN
CNF RNF
VIN
CIN
ON/OFF
4
3
2
1
FB
IN-
EN
V+
ch.1
L1
VOUT
SBD1
COUT CFB
EN="H": ON
EN="L": OFF
CT
5
GND SI
6
7
Power
MOS1
OUT
8
RSENSE1
RFB
R2
L
SBD
4
3
2
1
FB
IN-
EN
V
R1
Power
MOS FET
NJW4140
CT
REN
SW
4
3
2
1
FB
IN-
EN
V+
CT
GND SI
VOFF_OSC≤V EN≤V ON
synchronized operation mode
5
6
7
OUT
8
ch.2
L2
SBD2
Power
MOS2
VOUT
COUT
+
CT
GND
SI
OUT
5
6
7
8
CFB
RFB
R2
RSENSE
R1
CT
RSENSE2
Multiple uses are possible by
synchronous operation.
NJW4140 can realize nonisolated/isolated circuit
Please note that this device is still under the development
and therefore the specifications are subject to change.
Ver.2010/09/03 2