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NJM2345

JRC
Part Number NJM2345
Manufacturer JRC
Description PWM DC/DC Converter IC
Published Feb 11, 2010
Detailed Description NJM2345 PWM DC/DC Converter IC with Standby Function ■GENERAL DESCRIPTION The NJM2345 is a step down PWM DC/DC converter...
Datasheet PDF File NJM2345 PDF File

NJM2345
NJM2345

Overview
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 3.
0V to 40V ● Wide Oscillator Frequency 1kHz to 150kHz •Maximum duty ratio 100% •Precision Reference Voltage Vth=1.
25V ± 1% ● Internal High Power Transistor 1.
5A max.
● Internal Over Current Limit Circuit ● PWM switching control ● Standby Function 9µA typ.
● Bipolar Technology ● Package Outline NJM2345D : DIP8 NJM2345M : DMP8 ■PIN CONFIGURATION www.
DataSheet4U.
com ■BLOCK DIAGRAM 8 7 6 5 1 2 3 4 NJM2345D NJM2345M PIN FUNCTION 1.
CS 2.
ES 3.
CT 4.
GND 5.
IN6.
V+ 7.
ON/OFF 8.
SI CS 1 1.
5A 160Ω ES 2 Q R PWM Logic S 8 SI 7 ON/OFF High :ON Low :OFF (Standby) OSC Block MAX Duty =100% Ipk Sense 300mV 6 V + CT 3 Error AMP Vref 1.
25V PWM COMP GND 4 Buffer 5 IN- Ver.
2009-10-19 -1- NJM2345 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Maximum Supply Voltage V+ Comparator Input Voltage VIR ON/OFF Terminal Voltage VON/OFF Output Switch Voltage VSW Output Switch Current ISW Power Dissipation Operating Temperature Range Storage Temperature Range PD Topr Tstg MAXIMUM RATINGS 40 -0.
3 ~ 40 (note) -0.
3 ~ 40 (note) 40 1.
5 DIP8 875 DMP8 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 Power Dissipation vs.
Ambient Temperature 1000 (mW) 800 600 400 200 0 0 25 50 75 1...


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