NJM2393 Datasheet, PDF (1/7 Pages) New Japan Radio – Step-Down PWM DC/DC Converter IC

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
V_th=1.25V ± 1%
1.5A max.
100%
: DIP8
: DMP8
■PIN CONFIGURATION
■BLOCK DIAGRAM
1
8 ^{PIN FUNCTION}
1. C_S
C_S 1
2
7 2. E_S
3. C_T
Q
R
PW M
Logic
3
6 _{4. GND}
1.5A
S
5. IN-
4
5 _{6. V}⁺
160Ω
7. S_I
E_S 2
NJM2393D
NJM2393M
8. C_D
OSC Block
MAX Duty
=100%
Ipk Sense
300mV
8 C_D
7 S_I
C_T 3
Vref
1.25V
Error AMP
6 V⁺
PWM COMP
GND 4
Buffer
5 IN-
Ver.2009-09-28
-1-