NJW4161
MOSFET Drive Switching Regulator IC for Buck Converter
GENERAL DESCRIPTION
The
NJW4161
is a MOSFET Drive switching regulator IC for
Buck Converter that operates wide input range from 3.1V to 40V.
It can provide large current application because of built-in highly
effective Pch MOSFET 10V drive circuit.
There are two types, Hiccup type and Latch type, of over
current protection version.
It is suitable for logic voltage generation from high voltage that
Car Accessory, Office Automation Equipment, Industrial
Instrument and so on.
■
PACKAGE OUTLINE
NJW4161R
(MSOP8(VSP8))
NJW4161D
(DIP8)
FEATURES
Pch MOSFET Driving
Driving Voltage V
+
-10V(typ.)
Wide Operating Voltage Range
3.1V to 40V
PWM Control
Automatic PWM/PFM Control improves power efficiency at light load. (C ver.)
Wide Oscillating Frequency
50kHz to 1MHz
Soft Start Function
15ms (typ.)
Over Current Protection
Hiccup type (A, C ver.)
Latch type (B ver.)
Thermal Shutdown Protection
UVLO (Under Voltage Lockout)
Standby Function
Package Outline
NJW4161R: MSOP8(VSP8)
*MEETJEDEC MO-187-DA
NJW4161D: DIP8
PRODUCT CLASSFICATION
Part Number
NJW4161R-A
NJW4161D-A
NJW4161R-B
NJW4161R-C
Version
A
A
B
C
Controller
PWM control
PWM control
PWM control
PWM/PFM
control
Over Current
Protection
Hiccup type
Hiccup type
Latch type
Hiccup type
Package
MSOP8
(VSP8)
DIP8
MSOP8
(VSP8)
MSOP8
(VSP8)
Operating
Temperature
Range
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
Ver.2016-03-22
-1-
NJW4161
PIN CONFIGURATION
REGH 1
SI 2
OUT 3
V
+
8
7
6
5
GND
RT
FB
IN-
4
NJW4161R-A
NJW4161R-B
NJW4161R-C
NJW4161D-A
PIN DESCRIPTIONS
PIN NAME
REGH
SI
OUT
V
+
IN-
FB
RT
GND
PIN
NUMBER
1
2
3
4
5
6
7
8
FUNCTION
Output pin of the high side regulator.
Connect a bypass capacitor to stabilize a driver circuit.
Current Sensing pin
When difference voltage between the V
+
pin and the SI pin exceeds 120mV(typ.),
over current protection operates.
Output pin for Power MOSFET Driving
The OUT pin Voltage is clamped with V
+
-10V(typ.) at the time of Low level, in
order to protect a gate of Pch MOSFET.
Power Supply pin
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.
Feedback Setting pin
The feedback resistor and capacitor are connected between the FB pin and the
IN- pin.
Oscillating Frequency Setting pin by Timing Resistor.
Oscillating Frequency should set between 50kHz and 1MHz.
NJW4161 becomes the standby mode when make RT pin open.
GND pin
-2-
Ver.2016-03-22
NJW4161
BLOCK DIAGRAM
V
+
SI
Enable
Control
VREG
UVLO
V
IPK
Pulse by
Pulse
PWM
Comparator
Driver
10V
Regulator
500k
Soft Start
OSC
Error AMP
0.8V
VREF
OUT
REGH
PWM/PFM
Control
*C version only
TSD
IN-
RT
FB
GND
RT State
ON: Connect timing resistor to GND
OFF (Stand-by): RT terminal open
Ver.2016-03-22
-3-
NJW4161
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
V
+
OUT pin Voltage
V
OUT
SI pin Voltage
V
SI
REGH pin Voltage
V
REGH
IN- pin Voltage
V
IN-
RT pin Voltage
V
RT
I
O_PEAK+
OUT pin Peak Current
I
O_PEAK-
Power Dissipation
Operating Temperature Range
Storage Temperature Range
P
D
T
opr
T
stg
MAXIMUM RATINGS
-0.3 to +45
+
V -11 to V
+
(*1)
V
+
-5 to V
+
(*2)
V
+
-11 to V
+
(*1)
-0.3 to +6
-0.3 to +6 (*3)
1,700 (Source)
1,100 (Sink)
MSOP8
595 (*4)
(VSP8)
805 (*5)
DIP8
700 (Device itself)
-40 to +125
-50 to +150
C
C
(Ta=25°C)
UNIT
V
V
V
V
V
V
mA
mW
(*1): When Supply voltage is less than +11V, the absolute maximum rating is -0.3 to V
+
.
(*2): When Supply voltage is less than +5V, the absolute maximum rating is -0.3 to V
+
.
(*3): When Supply voltage is less than +6V, the absolute maximum voltage is equal to the Supply voltage.
(*4): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*5): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers),
internal Cu area: 74.2×74.2mm
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN.
+
Supply Voltage
V
3.1
Timing Resistor
R
T
1.5
Oscillating Frequency
f
OSC
50
REGH Capacitor
C
REGH
0.01
TYP.
–
–
–
0.1
MAX.
40
43
1,000
1
UNIT
V
k
kHz
F
-4-
Ver.2016-03-22
NJW4161
ELECTRICAL CHARACTERISTICS
(Unless otherwise noted, V
+
=12V, R
T
=10k , C
REGH
=0.1 F, Ta=25 C)
PARAMETER
Oscillator Block
Oscillating Frequency 1
Oscillating Frequency 2
Error Amplifier Block
Reference Voltage
Input Bias Current
Output Source Current
Output Sink Current
Soft Start Block
Soft Start Time
PWM Comparate Block
Input Threshold Voltage
(FB pin)
Maximum Duty Cycle
PWM/PFM Change
Duty Cycle
Current Limit Detection Block
Current Limit Detection
Voltage
Delay Time
Over Current Protection Block
Cool Down Time
Timer Latch Time
Output Block
Output High Level
ON Resistance
Output Low Level
ON Resistance
REGH Output Current
OUT pin Limiting Voltage
OUT pin Pull-Up Resistance
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
f
OSC1
f
OSC2
R
T
=3.6k
R
T
=10k
450
180
500
200
550
220
kHz
kHz
V
B
I
B
I
OM+
I
OM-
V
FB
=1V, V
IN-
=0.7V
V
FB
=1V, V
IN-
=0.9V
-1.0%
-0.1
50
6
0.8
–
90
13
+1.0%
0.1
140
20
V
A
A
mA
t
SS
V
B
=0.75V
7.5
15
24
ms
V
T_0
V
T_50
M
AX
D
UTY
PFMD
UTY
Duty=0%, V
IN-
=0.6V
Duty=50%, V
IN-
=0.6V
V
FB
=1.2V
C version
0.32
0.63
100
5
0.4
0.7
–
10
0.48
0.77
–
15
V
V
%
%
V
IPK
t
DELAY
110
–
120
80
130
–
mV
ns
t
COOL
t
LATCH
A, C version
B version
–
–
60
10
–
–
ms
ms
R
OH
R
OL
I
O_REGH
V
OLIM
R
OUT
I
O
= -50mA
I
O
= +50mA
REGH pin=V
+
-8V
–
–
50
V
+
-11
–
3.5
3.5
150
V
+
-10
500
7
7
250
V
+
-9
–
mA
V
k
V
T_ON
V
T_OFF
V
+
= L
→
H
V
+
= H
→
L
2.9
2.6
3.0
2.7
3.1
2.8
V
V
Ver.2016-03-22
-5-
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