© Semiconductor Components Industries, LLC, 2010
September, 2010 − Rev. 5
1 Publication Order Number:
NCP1529/D
NCP1529
1.7MHz, 1A, High Efficiency,
Low Ripple, Adjustable
Output Voltage Step-down
Converter
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 voltage 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
• Up to 96% Efficiency
• Best In Class Ripple, including PFM mode
• Source up 1.0 A
• 1.7 MHz Switching Frequency
• Adjustable from 0.9 V to 3.9 V or Fixed at 1.2 V or 1.35 V
• Synchronous rectification for higher efficiency
• 2.7 V to 5.5 V Input Voltage Range
• Low Quiescent Current 28 mA
• Shutdown Current Consumption of 0.3 mA
• Thermal Limit Protection
• Short Circuit Protection
• All Pins are Fully ESD Protected
• These are Pb−Free Devices
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• USB Powered Devices
• Portable Equipment
GND
VIN
EN
SW
FB
OFF ON
V
IN
C
IN
C
OUT
R1
R2
C
ff
Figure 1. Typical Application for Adjustable Version
L
V
OUT
GND
VIN
EN
SW
FB
OFF ON
V
IN
C
IN
C
OUT
Figure 2. Typical Application for Fixed Version
L
V
OUT
TSOP−5
SN SUFFIX
CASE 483
http://onsemi.com
MARKING
DIAGRAM
1
5
DXJ = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
1
5
DXJAYWG
G
XXMG
G
1
2
3
6
5
4
UDFN6
MU SUFFIX
CASE 517AB
XX = Specific Device Code
M = Date Code
G = Pb−Free Package
(Note: Microdot may be in either location)
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
ORDERING INFORMATION
