NR263S |Sanken Electric

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NR263S

Data sheetdownload (PDF:1100.94KB)
Application Note

Description

The NR263S is Synchronous Rectification buck regulator ICs integrates PowerMOSFETs. With the current mode control, ultra low ESR capacitors such as ceramic capacitors can be used. The ICs can realize super-high efficiency by performing pulse skip operation at light load condition. The ICs have protection functions such as Over-Current Protection (OCP), Under-Voltage Lockout (UVLO) and Thermal Shutdown (TSD). Soft starting time can be set up by selecting an external capacitor value. The ON/OFF pin (EN Pin) turns the regulator ON/OFF. The NR263S is available in an 8-pin SOP package.

Application

Refrigerator, air conditioner, LCD-TV, Blue-ray, power supply for digital consumer

Features

 Synchronous Rectification with internal PowerMOSFETs
 Current mode PWM control (Normal load)
 Pulse Skip Operation(at Light Load Condition)
 Up to 94% efficiency at normal load condition
 Up to 86% efficiency at light load condition
     (@Vin=12V,Vout=5V,Iout=10mA)
 Stable with low ESR ceramic output capacitors
 Built-in protection function
  Drooping type Over Current Protection (OCP) with Auto-restart
  Thermal Shutdown (TSD) with Auto-restart
  Under Voltage Lockout(UVLO)
  Vo Short Circuit Protection (HICCUP)
 By Vo = 5V fixed and external component count reduction  (NR263S)
 Soft-start Function by External Timing Capacitor
 Turn ON/OF the regulator function

Remarks

Package

Package Name:SOP8

Package Diagram

Design Support

Calculation Tool for NR263S : Click here

Specifications

Built-in PowerYES
Output Voltage5V Fixed
Output Current1A
Input Voltage Range8V to 31V
Operating Frequency500kHz
Synchronous / AsynchronousSynchronous
Current Mode ControlYES
Maximum Input Voltage35V
Minimum Input Voltage8V
Output On / OffYES
Low ESR Capacitor SupportYES
Overcurrent ProtectionHiccup
Phase CompensationBuilt-in
Thermal ProtectionYES
UVLOYES

Representative Circuit

Internal Block Diagram

Pin-out Diagrams

Data sheetdownload (PDF:1100.94KB)
Application Note
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