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參數資料
| 型號： | NCP1421D |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer |
| 中文描述： | 600毫安同步整流PFM升壓型DC - DC轉換器升壓型DC - DC轉換器與True - Cutoff和Ring殺手 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 116K |
| 代理商： | NCP1421D |
Semiconductor Components Industries, LLC, 2004
October, 2004 Rev. 6
1
Publication Order Number:
NCP1421/D
NCP1421
600 mA SyncRect PFM
StepUp DCDC Converter
with TrueCutoff and
RingKiller
NCP1421 is a monolithic micropower highfrequency stepup
switching converter IC specially designed for batteryoperated
handheld electronic products up to 600 mA loading. It integrates
SyncRect to improve efficiency and to eliminate the external
Schottky Diode. High switching frequency (up to 1.2 MHz) allows
for a low profile, smallsized 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 TrueCutoff function reduces the shutdown current
to typically only 50 nA. RingKiller is also integrated to eliminate
the highfrequency ringing in discontinuous conduction mode. In
addition to the above, LowBattery Detector, LogicControlled
Shutdown, CyclebyCycle Current Limit and Thermal Shutdown
provide valueadded features for various batteryoperated
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
PbFree 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
TrueCutoff Function Reduces Device Shutdown Current to
typically 50 nA
AntiRinging RingKiller for Discontinuous Conduction Mode
High Accuracy Reference Output, 1.20 V
2.5 mA Loading Current when V
OUT
> 3.3 V
Low Quiescent Current of 8.5 A
Integrated LowBattery Detector
Open Drain LowBattery Detector Output
1.0 V Startup at No Load Guaranteed
Output Voltage from 1.5 V to 5.0 V Adjustable
1.5 A CyclebyCycle Current Limit
Multifunction LogicControlled Shutdown Pin
On Chip Thermal Shutdown with Hysteresis
Typical Applications
Personal Digital Assistants (PDA)
Handheld Digital Audio Products
Camcorders and Digital Still Cameras
Handheld Instruments
Conversion from one to two Alkaline, NiMH, NiCd Battery Cells to
3.05.0 V or one Lithiumion cells to 5.0 V
White LED Flash for Digital Cameras
1.5%, can Supply
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.
Micro8
DM SUFFIX
CASE 846A
1
8
PIN CONNECTIONS
FB
OUT
LX
GND
BAT
LBI/EN
LBO
REF
1
2
3
4
8
7
6
5
MARKING
DIAGRAM
1421
A
Y
W
= Device Code
= Assembly Location
= Year
= Work Week
1421
AYW
(Top View)
NCP1421DMR2G
Micro8
(PbFree)
4000 Tape & Reel
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| NCP1421DMR2 | 功能描述:直流/直流開關轉換器 600mA PFM Boost RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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