NCP1532: Buck Converter, DC-DC, Dual, Low Iq, High Efficiency, 2.25 MHz, 1.6 A

The NCP1532 dual step down DCDC converter is a monolithic integrated circuit dedicated to supply core and I/O voltages of new multimedia design in portable applications powered from 1-cell Li-ion or 3 cell Alkaline/NiCd/NiMH batteries. Both channels are externally adjustable from 0.9V to 3.3V and can source totally up to 1.6A, 1.0A maximum per channel. Converters are running at 2.25MHz switching frequency which reduces component size by allowing the use of small inductor (down to 1uH) and capacitors and operates 180 degrees out of phase to reduce large amount of current demand on the battery. Automatic switching PWM/PFM mode and synchronous rectification offer improved system efficiency. The device can also operate into fixed frequency PWM mode for low noise applications where low ripple and good load transients are required. Additional features include integrated soft-start, cycle-by-cycle current limit and thermal shutdown protection. The device can also be synchronized to an external clock signal in the range of 2.25 MHz. The NCP1532 is available in a space saving, ultra low profile 3x3 x 0.55 mm 10 pin uDFN package.

Features

97% efficiency, 50uA quiescent current, 0.3 uA shutdown current
2.25MHz switching frequency
Mode pin operation : Auto-switching PWM/PFM mode at light loading or PWM mode only
Adjustable outputs voltage from 0.9V to 3.3V
POR on reset output pin
Can source up to 1.6A, 1.0A max per channel (800mA/800mA or 1.0A/600mA)

Benefits

Extends battery life and 'play-time'
Allows use of smaller inductor and capacitor
Allow user select between low power consumption at light loading or noise and ripple performance

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

Application Notes (1)

Document Title	Document ID/Size	Revision	Revision Date
How to Increase Output Current Capability Using Load Sharing Method	AND8339/D (219.0kB)	1

Data Sheets (1)

Document Title	Document ID/Size	Revision	Revision Date
2.25 MHz Dual Output Step-Down Converter	NCP1532/D (377.0kB)	6

Evaluation Board Documents (5)

Document Title	Document ID/Size	Revision
NCP1532 Dual Output Step-down Converter Evaluation Board User's Manual	EVBUM2107/D (398.0kB)	1
NCP1532GEVB Bill of Materials ROHS Compliant	NCP1532EVB_BOM_ROHS.PDF (159.0kB)	0
NCP1532GEVB Gerber Layout Files (Zip Format)	NCP1532EVB_GERBER.ZIP (741.0kB)	3
NCP1532GEVB Schematic	NCP1532EVB_SCHEMATIC.PDF (177.0kB)	1
NCP1532GEVB Test Procedure	NCP1532EVB_TEST_PROCEDURE.PDF (241.0kB)	0