NCP1522 Datasheet, PDF (1/17 Pages) ON Semiconductor – 3.0 MHz, 600 mA, High−Efficiency, Low Quiescent Current, Adjustable Output Voltage Step−Down Converter

NCP1522
3.0 MHz, 600 mA,
High−Efficiency, Low
Quiescent Current,
Adjustable Output Voltage
Step−Down Converter
The NCP1522 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 device is available in an
adjustable output voltage 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 3.0 MHz (nominal) oscillator which
reduces component size by allowing a small inductor and capacitors.
Automatic switching PWM/PFM mode offers improved system
efficiency.
Finally, it includes an integrated soft−start, cycle−by−cycle current
limiting, and thermal shutdown protection. The NCP1522 is
available in a space saving, low profile TSOP5 package.
Features
• 93.8% of Efficiency for 3.3 V Output and 4.5 V Input and 120 mA
Load Current
• Sources up to 600 mA
• 3.0 MHz Switching Frequency
• Adjustable Output Voltage from 0.9 V to 3.3 V
• 60 mA Quiescent Current (Typ)
• Synchronous Rectification for Higher Efficiency
• 2.7 V to 5.5 V Input Voltage Range
• Thermal Limit Protection
• Shutdown Current Consumption of 0.3 mA
• Short Circuit Protection
• This is a Pb−Free Device
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
• USB Powered Devices
• Digital Still/Video Cameras
http://onsemi.com
5
1
TSOP−5
ASN SUFFIX
CASE 483
MARKING
DIAGRAM
5
DBRAYWG
G
1
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
VIN 1
GND 2
EN 3
5 LX
4 FB
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP1522ASNT1G TSOP−5 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
VOUT
R1
Cff
R2
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2006
1
August, 2006 − Rev. 3
Publication Order Number:
NCP1522/D