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Switching Regulator. NJW1933-T Datasheet |
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NJW1933-T
600mA, 500kHz, Step-Down Switching Regulator
in SOT-23
GENERAL DESCRIPTION
The NJW1933 is a switching regulator IC for buck converter that
operates wide input voltage range from 4.5V to 40V. The wide input
range makes the NJW1933 suitable for several applications such as
12V and/or 24V industrial supplies, automotive batteries and the other
unregulated voltage sources.
It corresponds to Low ESR output capacitor (MLCC), high
operating frequency of 500kHz, internally compensated and small
SOT-23 package. Therefore, the NJW1933 can realize downsizing of
applications with a few and tiny external parts so that adopts current
mode control.
Also, it has a soft start function, over current protection and thermal
shutdown circuit.
■ PACKAGE OUTLINE
NJW1933F1
FEATURES
● Pin compatible with LT1933 and LT2842. Also it is possible to reduce an external part
● Maximum Rating Input Voltage:
45V
● Wide Operating Voltage Range:
4.5 V to 40V
● Switching Current:
0.8A (min.)
● Fixed Operating Frequency:
500kHz (A-version)
● Uses Tiny Capacitors and Inductors
● Soft Start Function
● Low Shutdown Current 1 A
● Internally Compensated
● Under Voltage Lockout (UVLO)
● Output Adjustable Down to 1.25V
● Over Current Protection / Thermal Shutdown Protection
● Package Outline:
SOT-23-6-1
PIN CONFIGURATION
N.C. 1
GND 2
FB 3
6 SW
5 VIN
4 SHDN
NJW1933F1
Ver.2016-02-22
-1-
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NJW1933-T
■ PIN DESCRIPTIONS
PIN NAME
PIN
NUMBER
N.C. 1
GND
2
FB 3
SHDN
VIN
SW
4
5
6
FUNCTION
Unused pin
GND pin
Output Voltage Detecting pin
Connects output voltage through the resistor divider tap to this pin in order to voltage
of the FB pin become 1.245V.
Standby Control pin
Normal Operation at the time of High Level. Standby Mode at the time of Low Level
or Open.
Power Supply pin for Power Line
Switch Output pin of Power MOSFET
■ BLOCK DIAGRAM
UVLO
SHDN
Soft
Start
FB
Vref
1.245V
Error
AMP
∑ OSC
SQ
R
PWM
GND
VIN
CURRENT
SENSE
OCP
Buffer
TSD
SW
-2-
Ver.2016-02-22
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NJW1933-T
■ ABSOLUTE MAXIMUM RATINGS
(Ta=25 C)
PARAMETER
SYNBOL
RATINGS
UNIT
Input Voltage
VIN-SW pin voltage
SHDN Voltage
Feedback Pin Voltage
Power Dissipation
VIN
VV-SW
VSHDN
VFB
PD
0.3 to 45
0.3 to 45
0.3 to 45
0.3 to 6
510 (*1)
710 (*2)
V
V
V
V
mW
Junction Temperature
Operating Temperature
Storage Temperature
Tj
Topr
Tstg
40 to 150
40 to 105
50 to 150
C
C
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),
internal Cu area: 74.2×74.2mm
■ RECOMMENDED OPERATING CONDITION
PARAMETER
SYMBOL
Input Voltage
VIN
MIN.
4.5
TYP.
–
MAX.
40
(Ta=25ºC)
UNIT
V
Ver.2016-02-22
-3-
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