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PDF NJW1933-T Data sheet ( Hoja de datos )
| Número de pieza | NJW1933-T | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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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-
1 page  
NJW1933-T
THERMAL CHARACTERISTICS
PARAMETER
SYMBOL VALUE
UNIT
Junction-to-ambient
thermal resistance
ja
245 (*3)
175 (*4)
C/W
Junction-to-Top of package
characterization parameter
jt
70 (*3)
60 (*4)
C/W
(*3): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*4): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers),
internal Cu area: 74.2×74.2mm
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJW1933F1
Power Dissipation vs. Ambient Temperature
(Topr=-40 to +105ºC, Tj= ~150ºC)
800
*4) At on 4-layer PC Board
700
600
500
*3) At on 2-layer PC Board
400
300
200
100
0
-50
-25 0 25 50 75 100 125 150
Ambient Temperature Ta [ºC]
Ver.2016-02-22
-5-
5 Page 
NJW1933 ApplicatNioJnWM1a9n3u3a-Tl
Description of Block Features (Continued)
2. Additional and Protection Functions / Features
Technical Information
Under Voltage Lockout (UVLO)
The NJW1933 includes an undervoltage lockout to prevent switching when VIN is less than 4.35V (typ.). The
NJW1933 has 100mV (typ.) width hysteresis voltage at rise and decay of power supply voltage. The hysteresis
prevents the malfunction at the time of UVLO operating and releasing.
Soft Start Function (Soft Start)
The SHDN pin can be used to soft-start the NJW1933, reducing the maximum input current during start up. The
SHDN pin is driven through an external RC filter to create a voltage ramp at this pin. By adjusting the RC time
constant, the peak start up current can be reduced to the current that is required to regulate the output, with no
overshoot. And the soft-start operation is able to adjust, too. Moreover, the switching current limit value is limited by
applied voltage to the SHDN pin. When the applying voltage is 2.3V, ILIM becomes maximum spec.
(Refer to "Switching Current Limit vs.SHDN Pin Voltage" characteristics on ELECTRICAL CHARACTERISTICS)
Choose the value of the resistor so that it can supply 20μA or more when the SHDN pin reaches 2.3V.
Ver.2016-02-22
- 11 -
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet NJW1933-T.PDF ] | |
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