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NCP1421/D Datasheet

  • NCP1421/D

  • 600mA Sync-Rect PFM Step-Up DC-DC converter with True-Cutoff...

  • 14頁

  • ETC

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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-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-Cutof f 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 Micro8t package.
Features
http://onsemi.com
8
1
Micro8
DM SUFFIX
CASE 846A
MARKING
DIAGRAM
1421
AYW
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High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input
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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-Cutof f 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
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
Housed in Space-Saving and Low Profile Micro8 Package
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
1421
A
Y
W
= Device Code
= Assembly Location
= Year
= Work Week
PIN CONNECTIONS
FB
LBI/EN
LBO
REF
1
2
3
4
(Top View)
8
7
6
5
OUT
LX
GND
BAT
ORDERING INFORMATION
Device
NCP1421DMR2
Package
Micro8
Shipping
4000 Tape & Reel
Typical Applications
漏
Semiconductor Components Industries, LLC, 2003
1
June, 2003 - Rev. 4
Publication Order Number:
NCP1421/D

NCP1421/D相關型號PDF文件下載

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  • 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...
    ON SEMICONDUCTOR
  • 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...

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