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NJM2393 Datasheet Preview

NJM2393 Datasheet

Step-Down PWM DC/DC Converter IC

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NJM2393
Step-Down PWM DC/DC Converter IC
GENERAL DESCRIPTION
The NJM2393 is a step down PWM DC/DC converter IC.
An internal 1.5A power transistor, a pulse-by-pulse current limit
circuit and a 1% precision reference make the NJM2393
suitable for a wide range of step down applications.
The NJM2393 features 100% maximum duty cycle for low
voltage drop operation.
PACKAGE OUTLINE
NJM2393D
NJM2393M
FEATURES
Operating Voltage
Wide Oscillator Frequency
Precision Reference Voltage
Internal High Power Transistor
Maximum duty ratio
Internal Over Current Limit Circuit
PWM switching control
Bipolar Technology
Package Outline NJM2393D
NJM2393M
3.0V~40V
1kHz~150kHz
Vth=1.25V ± 1%
1.5A max.
100%
: DIP8
: DMP8
PIN CONFIGURATION
BLOCK DIAGRAM
1
ww2w.DataSheet4U.com
3
4
NJM2393D
NJM2393M
8 PIN FUNCTION
1. CS
7 2. ES
3. CT
6 4. GND
5. IN-
5 6. V+
7. SI
8. CD
CS 1
1.5A
ES 2
160
QR
PW M
Logic
S
8 CD
7 SI
CT 3
OSC Block
MAX Duty
=100%
Vref
1.25V
Error AMP
Ipk Sense
300mV
PWM COMP
6 V+
GND 4
Buffer
5 IN-
Ver.2009-09-28
-1-




JRC

NJM2393 Datasheet Preview

NJM2393 Datasheet

Step-Down PWM DC/DC Converter IC

No Preview Available !

NJM2393
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
Maximum Supply Voltage
Comparator Input Voltage
Output Driver Voltage
Output Switch Voltage
Output Driver Current
Output Switch Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V+
VIR
VC(driver)
VSW
IC(driver)
ISW
PD
Topr
Tstg
MAXIMUM RATINGS
40
-0.3 ~ 40 (note)
40
40
100
1.5
DIP8
DMP8
875
580 (*1)
750 (*2)
-40 ~ +85
-50 ~ +150
UNIT
V
V
V
V
mA
A
mW
°C
°C
(note) When supply voltage is less than 40V, the absolute maximum input voltage is equal to the supply voltage.
(*1) At on PC board : 114.3mm × 76.2mm × 1.6mm(2 layer FR-4) : Conform to EIA/JEDEC
(*2) At on PC board :114.3mm × 76.2mm × 1.6mm(4 layer FR-4) : Conform to EIA/JEDEC
POWER DISSIPATION vs. AMBIENT TEMPERATURE
Power Dissipation vs. Ambient Temperature
1000
(Topr=-40~+85oC, Tj= ~150oC)
DIP8
800
600
www.DataSheet4U.com
400
200
0
0
DMP8
At on 4 layer PC Board
At on 2 layer PC Board
25 50 75 100
Ambient Temperature Ta (oC)
-2-
Ver.2009-09-28


Part Number NJM2393
Description Step-Down PWM DC/DC Converter IC
Maker JRC
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NJM2393 Datasheet PDF






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