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NJM2345 Datasheet Preview

NJM2345 Datasheet

PWM DC/DC Converter IC

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NJM2345
PWM DC/DC Converter IC with Standby Function
GENERAL DESCRIPTION
The NJM2345 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 NJM2345 suitable
for a wide range of voltage converter needs.
The NJM2345 features a standby function that can be used for
both power saving and safety operation.
PACKAGE OUTLINE
NJM2345D
NJM2345M
FEATURES
Operating Voltage
Wide Oscillator Frequency
Maximum duty ratio
Precision Reference Voltage
Internal High Power Transistor
Internal Over Current Limit Circuit
PWM switching control
Standby Function
Bipolar Technology
Package Outline NJM2345D
NJM2345M
3.0V to 40V
1kHz to 150kHz
100%
Vth=1.25V ± 1%
1.5A max.
9µA typ.
: DIP8
: DMP8
PIN CONFIGURATION
BLOCK DIAGRAM
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1
2
3
4
NJM2345D
NJM2345M
8 PIN FUNCTION CS 1
1. CS
7 2. ES
3. CT
1.5A
6 4. GND
160
5. IN-
5 6. V+
ES 2
7. ON/OFF
8. SI
OSC Block
MAX Duty
=100%
QR
PWM
Logic
S
Ipk Sense
300mV
8 SI
7 ON/OFF
High :ON
Low :OFF (Standby)
CT 3
Vref
1.25V
Error AMP
6 V+
PWM COMP
GND 4
Buffer
5 IN-
Ver.2009-10-19
-1-




JRC

NJM2345 Datasheet Preview

NJM2345 Datasheet

PWM DC/DC Converter IC

No Preview Available !

NJM2345
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
Maximum Supply Voltage
Comparator Input Voltage
ON/OFF Terminal Voltage
Output Switch Voltage
Output Switch Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V+
VIR
VON/OFF
VSW
ISW
PD
Topr
Tstg
MAXIMUM RATINGS
40
-0.3 ~ 40 (note)
-0.3 ~ 40 (note)
40
1.5
DIP8
DMP8
875
580 (*1)
750 (*2)
-40 ~ +85
-50 ~ +150
UNIT
V
V
V
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
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Power Dissipation vs. Ambient Temperature
1000
(Topr=-40~+85oC, Tj= ~150oC)
DIP8
800
600
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.2009-10-19


Part Number NJM2345
Description PWM DC/DC Converter IC
Maker JRC
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NJM2345 Datasheet PDF






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