NCP1421
600 mA Sync鈭扲ect PFM
Step鈭扷p DC鈭扗C Converter
with True鈭扖utoff and
Ring鈭扠iller
NCP1421 is a monolithic micropower high鈭抐requency step鈭抲p
switching converter IC specially designed for battery鈭抩perated
hand鈭抙eld electronic products up to 600 mA loading. It integrates
Sync鈭扲ect to improve efficiency and to eliminate the external
Schottky Diode. High switching frequency (up to 1.2 MHz) allows
for a low profile, small鈭抯ized 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鈭扖utoff function reduces the shutdown current
to typically only 50 nA. Ring鈭扠iller is also integrated to eliminate
the high鈭抐requency ringing in discontinuous conduction mode. In
addition to the above, Low鈭払attery Detector, Logic鈭扖ontrolled
Shutdown, Cycle鈭抌y鈭扖ycle Current Limit and Thermal Shutdown
provide value鈭抋dded features for various battery鈭抩perated
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 Micro8t package.
Features
http://onsemi.com
MARKING
DIAGRAM
Micro8
DM SUFFIX
CASE 846A
8
1
1421
AYW
1421
A
Y
W
= Device Code
= Assembly Location
= Year
= Work Week
鈥?/div>
Pb鈭扚ree Package is Available
鈥?/div>
High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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鈭扖utoff Function Reduces Device Shutdown Current to
typically 50 nA
Anti鈭扲inging Ring鈭扠iller 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
mA
Integrated Low鈭払attery Detector
Open Drain Low鈭払attery 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鈭抌y鈭扖ycle Current Limit
Multi鈭抐unction Logic鈭扖ontrolled Shutdown Pin
On Chip Thermal Shutdown with Hysteresis
FB
LBI/EN
LBO
REF
PIN CONNECTIONS
1
2
3
4
(Top View)
8
7
6
5
OUT
LX
GND
BAT
ORDERING INFORMATION
Device
NCP1421DMR2
NCP1421DMR2G
Package
Micro8
Micro8
(Pb鈭扚ree)
Shipping鈥?/div>
4000 Tape & Reel
4000 Tape & Reel
Typical Applications
Personal Digital Assistants (PDA)
Handheld Digital Audio Products
Camcorders and Digital Still Cameras
Hand鈭抙eld Instruments
Conversion from one to two Alkaline, NiMH, NiCd Battery Cells to
3.0鈭?.0 V or one Lithium鈭抜on cells to 5.0 V
鈥?/div>
White LED Flash for Digital Cameras
漏
Semiconductor Components Industries, LLC, 2004
鈥燜or information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
1
October, 2004 鈭?Rev. 6
Publication Order Number:
NCP1421/D
NCP1421DMR2相關(guān)型號PDF文件下載
-
型號
版本
描述
廠商
下載
-
英文版
Sub 1.0 V Precision Adjustable Shunt Regulator
ONSEMI
-
英文版
Sub 1.0 V Precision Adjustable Shunt Regulator
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby-Power Offl...
-
英文版
Integrated Off-Line Switching Regulator
ONSEMI
-
英文版
Integrated Off-Line Switching Regulator
ONSEMI [ON...
-
英文版
Integrated Off-Line Switching Regulator
ONSEMI
-
英文版
Integrated Off-Line Switching Regulator
ONSEMI [ON...
-
英文版
Integrated Off-Line Switching Regulator
ONSEMI
-
英文版
Integrated Off-Line Switching Regulator
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI [ON...
-
英文版
Self-Supplied Monolithic Switcher for Low Standby- Power Off...
ONSEMI [ON Semi...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
