NCP1521B Datasheet, PDF (1/14 Pages) ON Semiconductor – 1.5 MHz, 600 mA Step−Down DC−DC Converter

NCP1521B
1.5 MHz, 600 mA
Step−Down DC−DC
Converter
High−Efficiency, Low Ripple, Adjustable
Output Voltage
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
• 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 3.3 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
http://onsemi.com
MARKING
DIAGRAM
5
1
TSOP−5
SN SUFFIX
CASE 483
5
DBPAYWG
G
1
DBP = Specific Device Code
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
UDFN6
MU SUFFIX
CASE 517AB
1
6
2 ^ZCMG 5
3G4
ZC = Specific Device Code
M
= Date Code
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1521BSNT1G TSOP−5 3000/Tape & Reel
(Pb−Free)
NCP1521BMUTBG UDFN6 3000/Tape & Reel
(Pb−Free)
†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.
VIN
CIN
OFF ON
1 VIN LX 5
2 GND
3 EN
FB 4
L
COUT
Figure 1. Typical Application − TSOP−5
VOUT
R1
R2
OFF ON
Cff
1 EN FB 6
2 GND LX 5
R2
2.2 mH R1
3 VIN GND 4
18 pF
VOUT
10 mF
4.7 mF
VIN
Figure 2. Typical Application − UDFN6
© Semiconductor Components Industries, LLC, 2007
1
March, 2007 − Rev. 0
Publication Order Number:
NCP1521B/D