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© Semiconductor Components Industries, LLC, 2013
August, 2013 − Rev. 6
1 Publication Order Number:
NCP1521B/D
NCP1521B
1.5 MHz, 600 mA Step-Down
DC-DC Converter
High−Efficiency, Low Ripple, Adjustable
Output Voltage
The NCP1521B step−down DC−DC converter is a monolithic
integrated circuit optimized for portable applications powered from one
cell Li−Ion or three cell Alkaline/NiCd/NiMH batteries. The part,
available in adjustable output voltage versions ranging from 0.9 V to
3.9 V, is able to deliver up to 600 mA. 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 a space saving, low profile TSOP5 and UDFN6 packages.
Features
• Up to 96% Efficiency
• Best−In−Class Ripple, including PFM Mode
• Sources up to 600 mA
• 1.5 MHz Switching Frequency
• Adjustable Output Voltage from 0.9 V to 3.9 V
• Synchronous Rectification for Higher Efficiency
• 2.7 V to 5.5 V Input Voltage Range
• Low Quiescent Current
• Shutdown Current Consumption of 0.3 mA
• Thermal Limit Protection
• Short Circuit Protection
• All Pins are Fully ESD Protected
• This is a Pb−Free Device
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still/Video Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
• USB Powered Devices
GND
2
VIN
1
EN
3
LX
5
FB
4
OFF ON
VIN
CIN
COUT
R1
R2
Cff
Figure 1. Typical Application − TSOP−5
L VOUT
GND
2
EN
1
VIN
3
FB
6
GND
4
OFF ON
R1
R2
VOUT
5
LX
VIN
Figure 2. Typical Application − UDFN6
TSOP−5
SN SUFFIX
CASE 483
http://onsemi.com
MARKING
DIAGRAM
1
5
Device Package Shipping
†
ORDERING INFORMATION
NCP1521BSNT1G TSOP−5
(Pb−Free)
3000/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
GAL = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
1
5
GALAYWG
G
ZCMG
G
1
2
3
6
5
4
UDFN6
MU SUFFIX
CASE 517AB
ZC = Specific Device Code
M = Date Code
G = Pb−Free Package
(Note: Microdot may be in either location)
NCP1521BMUTBG UDFN6
(Pb−Free)
3000/Tape & Reel
NCP1521BMUTAG UDFN6
(Pb−Free)
3000/Tape & Reel
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