NJM2345 Datasheet, PDF (1/8 Pages) New Japan Radio – PWM DC/DC Converter IC with Standby Function

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%
V_th=1.25V ± 1%
1.5A max.
9µA typ.
: DIP8
: DMP8
■PIN CONFIGURATION
■BLOCK DIAGRAM
1
8 ^{PIN FUNCTION} CS 1
1. C_S
2
7 2. E_S
3. C_T
1.5A
3
6 _{4. GND}
160Ω
4
5. IN-
5 _{6. V}⁺
ES 2
NJM2345D
7. ON/OFF
8. S_I
OSC Block
MAX Duty
=100%
NJM2345M
QR
PWM
Logic
S
Ipk Sense
300mV
8 SI
7 ON/OFF
High :ON
Low :OFF (Standby)
CT 3
6 V⁺
Error AMP
Vref
1.25V
PWM COMP
GND 4
Buffer
5 IN-
Ver.2009-10-19
-1-