NCP1521B: Buck Converter, DC-DC, 1.5 MHz, 600 mA _ BDTIC a Leading Distributor in China

NCP1521B: Buck Converter, DC-DC, 1.5 MHz, 600 mA

The NCP1521B step-down PWM DC-DC converter is optimized for portable applications powered from one cell Li-ion or three cell Alkaline/NiCd/NiMH batteries. The part is available in adjustable output voltage versions ranging from 0.9 V to 3.3 V. It uses synchronous rectification to increase efficiency and reduce external part count. The device also has a built-in 1.5 MHz (nominal) oscillator which reduces component size by allowing smaller inductors and capacitors. Automatic switching PWM/PFM mode offers improved system efficiency. Additional features include integrated soft-start, cycle-by-cycle current limiting and thermal shutdown protection. The NCP1521B is available in space saving, low profile TSOP5 and UDFN6 packages.

Features

96% efficiency, 30 uA quiescent current, 0.3 uA shutdown current
1.5 MHz switching frequency
Auto-switching between PWM and PFM mode at light load conditions
Adjustable output voltage from 0.9V to 3.3V
Best in class Low Ripple even in PFM mode

Benefits

Extends battery life and 'play-time'
Allows use of smaller inductor and capacitor
Low power consumption at light loading

Applications

Power supply for application processor
Power supply for processor with low core voltage

End Products

Cellular phones, smart phones, and PDAs
MP3 players and portable audio systems
Digital still cameras and video cameras

Application Notes (1)

Document Title	Document ID/Size	Revision	Revision Date
NCP1521B Step-Down Converter Simulation Procedure	AND8285/D (726.0kB)	0

Package Drawings (1)

Document Title	Document ID/Size	Revision
TSOP-5	483 (32.5kB)	M

Simulation Models (1)

Document Title	Document ID/Size	Revision	Revision Date
NCP1521B Simulation Model	NCP1521B SIMULATION MODEL (10.0kB)	0

Data Sheets (1)

Document Title	Document ID/Size	Revision	Revision Date
Buck Converter, DC-DC, 1.5 MHz, 600 mA	NCP1521B/D (181.0kB)	6

Evaluation Board Documents (5)

Document Title	Document ID/Size	Revision
NCP1521B Adjustable Output Voltage Step-Down Converter Evaluation Board User's Manual	EVBUM2104/D (236.0kB)	1
NCP1521BEVB Bill of Materials ROHS Complieant	NCP1521BEVB_BOM_ROHS.PDF (82.0kB)	0
NCP1521BEVB Gerber Layout Files (ZipFormat)	NCP1521BEVB_GERBERS.ZIP (63.0kB)	0
NCP1521BEVB Schematic	NCP1521BEVB_SCHEMATIC.PDF (118.0kB)	0
NCP1521BEVB Test Procedure	NCP1521BEVB_TEST_PROCEDURE.PDF (141.0kB)	0