On Semiconductor NCP1421 Evaluation Board NCP1421LEDGEVB NCP1421LEDGEVB データシート
製品コード
NCP1421LEDGEVB
Semiconductor Components Industries, LLC, 2004
October, 2004 − Rev. 6
1
Publication Order Number:
NCP1421/D
NCP1421
600 mA Sync−Rect PFM
Step−Up DC−DC Converter
with True−Cutoff and
Ring−Killer
Step−Up DC−DC Converter
with True−Cutoff and
Ring−Killer
NCP1421 is a monolithic micropower high−frequency step−up
switching converter IC specially designed for battery−operated
hand−held electronic products up to 600 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
hand−held electronic products up to 600 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
A. This device is available in the
compact and low profile Micro8
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 600 mA at V
IN
= 2.5 V and V
OUT
= 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%, can Supply
2.5 mA Loading Current when V
OUT
> 3.3 V
•
Low Quiescent Current of 8.5
A
•
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
Device
Package
Shipping†
ORDERING INFORMATION
NCP1421DMR2
Micro8
4000 Tape & Reel
http://onsemi.com
†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.
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Micro8
DM SUFFIX
CASE 846A
CASE 846A
1
8
PIN CONNECTIONS
FB
OUT
LBI/EN
LBO
REF
LX
GND
BAT
1
8
2
3
4
7
6
5
MARKING
DIAGRAM
DIAGRAM
1421
= Device Code
A
= Assembly Location
Y
= Year
W
= Work Week
1421
AYW
AYW
(Top View)
NCP1421DMR2G
Micro8
(Pb−Free)
4000 Tape & Reel