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NCP1422 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1422
Description  800 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1422 Datasheet(HTML) 1 Page - ON Semiconductor

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© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 3
1
Publication Order Number:
NCP1422/D
NCP1422
800 mA Sync−Rect PFM
Step−Up DC−DC Converter
with True−Cutoff and
Ring−Killer
NCP1422 is a monolithic micropower high−frequency step−up
switching converter IC specially designed for battery−operated
hand−held electronic products up to 800 mA loading. It integrates
Sync−Rect to improve efficiency and to eliminate the external
Schottky Diode. High switching frequency (up to 1.2 MHz) allows
for a low profile, small−sized inductor and output capacitor to be
used. When the device is disabled, the internal conduction path from
LX or BAT to OUT is fully blocked and the OUT pin is isolated from
the battery. This True−Cutoff function reduces the shutdown current
to typically only 50 nA. Ring−Killer is also integrated to eliminate
the high−frequency ringing in discontinuous conduction mode. In
addition to the above, Low−Battery Detector, Logic−Controlled
Shutdown, Cycle−by−Cycle Current Limit and Thermal Shutdown
provide value−added features for various battery−operated
applications. With all these functions on, the quiescent supply
current is typically only 8.5
mA. This device is available in the
compact and low profile DFN−10 package.
Features
Pb−Free Package is Available*
High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input
88% for 3.3 V Output at 500 mA from 2.5 V Input
High Switching Frequency, up to 1.2 MHz (not hitting current limit)
Output Current up to 800 mA at VIN = 2.5 V and VOUT = 3.3 V
True−Cutoff Function Reduces Device Shutdown Current to
typically 50 nA
Anti−Ringing Ring−Killer for Discontinuous Conduction Mode
High Accuracy Reference Output, 1.20 V $1.5% @ 25°C, can
Supply 2.5 mA Loading Current when VOUT > 3.3 V
Low Quiescent Current of 8.5 mA
Integrated Low−Battery Detector
Open Drain Low−Battery Detector Output
1.0 V Startup at No Load Guaranteed
Output Voltage from 1.5 V to 5.0 V Adjustable
1.5 A Cycle−by−Cycle Current Limit
Multi−Function Logic−Controlled Shutdown Pin
On Chip Thermal Shutdown with Hysteresis
Typical Applications
Personal Digital Assistants (PDA)
Handheld Digital Audio Products
Camcorders and Digital Still Cameras
Hand−held Instruments
Conversion from one to two Alkaline, NiMH, NiCd Battery Cells
to 3.0−5.0 V or one Lithium−ion cells to 5.0 V
White LED Flash for Digital Cameras
PIN CONNECTIONS
Device
Package
Shipping†
ORDERING INFORMATION
NCP1422MNR2
DFN−10
3000 Tape & Reel
http://onsemi.com
MARKING
DIAGRAM
1422 = Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
(Top View)
1
1
1422
ALYW
G
G
DFN−10
MN SUFFIX
CASE 485C
FB
OUT
LBI/EN
LBO
REF
NC
LX
BAT
NC
GND
1
2
3
4
5
10
9
8
7
6
DFN−10
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
NCP1422MNR2G
DFN−10
(Pb−Free)
3000 Tape & Reel


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