NCP1529: Buck Converter, DC-DC, High Efficiency, Adjustable Output Voltage, Low Ripple, 1.7 MHz, 1 A

The NCP1529 step-down DC-DC converter is a monolithic integrated circuit for portable applications powered from one cell Li-ion or three cell Alkaline/NiCd/NiMH batteries. The device is able to deliver up to 1.0 A on an output range externally adjustable from 0.9 V to 3.9 V or fixed at 1.2 V or 1.35 V.It uses synchronous rectification to increase efficiency and reduce external part count. The device also has a built-in 1.7 MHz (nominal) oscillator which reduces component size by allowing a small inductor 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 NCP1529 is available in a space saving, low profile 2x2x0.5 mm UDFN6 package and TSOP-5 package.

Features

96% efficiency, 28 uA quiescent current, 0.3 uA shutdown current
1.7 MHz switching frequency
Auto-switching between PWM and PFM mode at light load conditions
Adjustable output voltage from 0.9V to 3.9V
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

Battery powered applications power management
Power supply for processor with low core voltage
USB powered devices
Low Voltage DC rails power management

End Products

Cellular phones, smart phones, and PDAs
MP3 players and portable audio systems

Application Notes (3)

Document Title	Document ID/Size	Revision	Revision Date
How to Prevent Thermal Issues with High Output Current DC to DC Converters	AND8338/D (97kB)	1	Dec, 2016
Make a White-LED Torch Using a Buck Converter	AND8465/D (451.0kB)	2
Use of NCP1529 Pspice Model	AND9004/D (457.0kB)	0

Simulation Models (1)

Document Title	Document ID/Size	Revision	Revision Date
Pspice Model of NCP1529	NCP1529_PSPICE (18.0kB)	0

Evaluation Board Documents (9)

Document Title	Document ID/Size	Revision
NCP1529 Series 1.7 MHz, 1 A, High Efficiency, Low Ripple, Adjustable Output Voltage Step-down Converter Evaluation Board User's Manual	EVBUM2106/D (868.0kB)	1
NCP1529ASNT1GEVB Bill of Materials ROHS Compliant	NCP1529ASNT1GEVB_BOM_ROHS.PDF (14.0kB)	0
NCP1529ASNT1GEVB Gerber Layout Files (Zip Format)	NCP1529ASNT1GEVB_GERBER.ZIP (446.0kB)	0
NCP1529ASNT1GEVB Schematic	NCP1529ASNT1GEVB_SCHEMATIC.PDF (123.0kB)	0
NCP1529ASNT1GEVB Test Procedure	NCP1529ASNT1GEVB_TEST_PROCEDURE.PDF (140.0kB)	0
NCP1529MUTBGEVB Bill of Materials ROHS Compliant	NCP1529MUTBGEVB_BOM_ROHS.PDF (22.0kB)	0
NCP1529MUTBGEVB Gerber Layout Files (Zip Format)	NCP1529MUTBGEVB_GERBER.ZIP (372.0kB)	0
NCP1529MUTBGEVB Schematic	NCP1529MUTBGEVB_SCHEMATIC.PDF (124.0kB)	0
NCP1529MUTBGEVB Test Procedure	NCP1529MUTBGEVB_TEST_PROCEDURE.PDF (148.0kB)	0

Data Sheets (1)

Document Title	Document ID/Size	Revision	Revision Date
Buck Converter, DC-DC, High Efficiency, Adjustable Output Voltage, Low Ripple, 1.7 MHz, 1 A	NCP1529/D (246.0kB)	5

Package Drawings (2)

Document Title	Document ID/Size	Revision
TSOP-5	483 (32.5kB)	M
UDFN6, 2x2, 0.65P	517AB (60.5kB)	C

Evaluation/Development Tool Information

Product	Status	Compliance	Short Description
NCP1529ASNT1GEVB	Active	Pb-free	1 A High Efficiency Step-Down Converter Evaluation Board
NCP1529MUTBGEVB	Active	Pb-free	1 A High Efficiency Step-Down Converter Evaluation Board

Order Information

Product	Status	Compliance	Package		MSL*	Container		Budgetary Price/Unit
NCP1529ASNT1G	Active	Pb-free Halide free	TSOP-5 / SOT-23-5	483	1	Tape and Reel	3000	$0.3333
NCP1529MU12TBG	Active	Pb-free Halide free	UDFN-6	517AB	1	Tape and Reel	3000	$0.32
NCP1529MUTBG	Active	Pb-free Halide free	UDFN-6	517AB	1	Tape and Reel	3000	$0.32

Specifications

Product	Topology	Control Mode	VCC Min (V)	VCC Max (V)	VO Typ (V)	IO Typ (A)	Efficiency (%)	fSW Typ (kHz)
NCP1529ASNT1G	Step-Down	Current Mode	2.7	5.5	0.9 to 3.9	1	96	1700
NCP1529MU12TBG	Step-Down	Current Mode	2.7	5.5	1.2	1	86	1700
NCP1529MUTBG	Step-Down	Current Mode	2.7	5.5	0.9 to 3.9	1	96	1700