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NJM2344 Datasheet Preview

NJM2344 Datasheet

PWM DC/DC Converter IC

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NJM2344
PWM DC/DC Converter IC with Standby Function
GENERAL DESCRIPTION
The NJM2344 is a general purpose PWM DC/DC converter IC
configurable for step-up, step-down and inverting applications.
An internal 1.5A power transistor, a pulse-by pulse current limit
and 1% precision reference make the NJM2344 suitable for a
wide range of voltage converter needs.
The NJM2344 features a standby function that can be used for
both power saving and safety operation.
PACKAGE OUTLINE
NJM2344D
NJM2344M
FEATURES
Operating Voltage
Wide Oscillator Frequency
Precision Reference Voltage
Internal High Power Transistor
Internal Over Current Limit Circuit
PWM switching control
Standby Function
Bipolar Technology
Package Outline NJM2344D
NJM2344M
3.0V to 40V
1kHz to 150kHz
Vth=1.25V ± 1%
1.5A max.
9µA typ.
: DIP8
: DMP8
PIN CONFIGURATION
BLOCK DIAGRAM
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2
3
4
NJM2344D
NJM2344M
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
ON Duty
9:1
QR
PW M
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.2009-10-13
-1-




JRC

NJM2344 Datasheet Preview

NJM2344 Datasheet

PWM DC/DC Converter IC

No Preview Available !

NJM2344
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
Maximum Supply Voltage
Comparator Input Voltage
ON/OFF Terminal Voltage
Output Driver Voltage
Output Switch Voltage
Output Driver Current
Output Switch Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V+
VIR
VON/OFF
VC(driver)
VSW
IC(driver)
ISW
PD
Topr
Tstg
MAXIMUM RATINGS
40
-0.3 ~ 40 (note)
-0.3 ~ 40 (note)
40
40
100
DIP8
DMP8
1.5
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
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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.2009-10-13


Part Number NJM2344
Description PWM DC/DC Converter IC
Maker JRC
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NJM2344 Datasheet PDF






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