NR264S |Sanken Electric

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NR264S

Data Sheetdownload (PDF:889.74KB)
Application Note

Description

The NR264S is synchronous rectification buck converter IC with built-in power MOSFET. In light load, the IC operates with the pulse skip mode to improve the efficiency. By using the peak current control method, the IC stably operates with a low ESR capacitor such as a ceramic capacitor. The IC has the various protections such as the overcurrent protection, the undervoltage lockout, and the thermal shutdown.
The IC achieves the switching regulator circuit with few components and small mounting area.

Application

・White Goods
・Audio Visual Equipment
・Office Automation Equipment
・Other Switched Mode Power Supply (SMPS)

Features

・Synchronous Rectification
・Operation Modes:
 Normal Load: Current Mode PWM Control
 Light Load: Pulse Skip Operation
・Maximum Efficiency (VIN = 12 V, VOUT = 5 V)
 Normal Load: 94%
 Light Load (IOUT = 10 mA): 86%
・Stable with a Low ESR Ceramic Output Capacitor
・Few External Component Counts
 (Fixed Output Voltage of 5 V)
・Soft-start Period Adjustment by External Capacitor
・Enable Function
・Frequency Limitation Function
 (Pulse Skip Frequency in Light Load is Limited to 28 kHz)
・Protections:
 Overcurrent Protection (OCP): Drooping Type, Autorestart
 Thermal Shutdown (TSD): Auto-restart
 Undervoltage Lockout (UVLO)
 Output Short Circuit Protection: Burst Oscillation
 Operation (Hiccup)

Remarks

Package

Package Name:SOP8

Package Diagram

Design Support

Specifications

Built-in PowerYES
Output Voltage3 V to 18 V
Output Current1A
Input Voltage Range8.0 V to 31 V
Operating Frequency500 kHz
Synchronous/AsynchronousSynchronous
Current Mode ControlYES
Maximum Input Voltage31V
Minimum Input Voltage35V
Output on/offYES
Low ESR Capacitor SupportYES
Overcurrent ProtectionDrooping Type
Phase CompensationExternal
Thermal ProtectionYES
UVLOYES

Representative Circuit

Internal Block Diagram

Pin-Out Diagrams

Data Sheetdownload (PDF:889.74KB)
Application Note
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