http://www.datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




  ON Semiconductor Electronic Components Datasheet  

NCP1421 Datasheet

600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer

No Preview Available !

NCP1421 pdf
NCP1421
600 mA Sync−Rect PFM
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 mA. This device is available in the
compact and low profile Micro8t 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 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%, 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
http://onsemi.com
8
1
MARKING
DIAGRAM
Micro8
DM SUFFIX
CASE 846A
1421
AYW
1421
A
Y
W
= Device Code
= Assembly Location
= Year
= Work Week
PIN CONNECTIONS
FB
LBI/EN
LBO
REF
1
2
3
4
8 OUT
7 LX
6 GND
5 BAT
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP1421DMR2
Micro8 4000 Tape & Reel
NCP1421DMR2G Micro8 4000 Tape & Reel
(Pb−Free)
†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.
© Semiconductor Components Industries, LLC, 2004
October, 2004 − Rev. 6
1
Publication Order Number:
NCP1421/D


  ON Semiconductor Electronic Components Datasheet  

NCP1421 Datasheet

600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer

No Preview Available !

NCP1421 pdf
NCP1421
0.5 V Chip
Enable
FB +
1
PFM
REF
4
Voltage
Reference
LBI/EN
2
1.20 V
+
VBAT
BAT
M3 5
ZLC +
+
20 mV
CONTROL LOGIC
TRUE CUTOFF
CONTROL
_ZCUR
_MSON
_TSDON
VDD
_MAINSW2ON
M2
SENSEFETt
M1
LX
VDD 7
OUT
8
VOUT
_CEN
_PFM
_MAINSWOFD
_SYNSW2ON
GND
VDD
6
GND
_SYNSWOFD
_VREFOK
_ILIM
+
GND
RSENSE
+
GND
LBO
3
GND
Figure 1. Detailed Block Diagram
http://onsemi.com
2


Part Number NCP1421
Description 600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer
Maker ON
Total Page 14 Pages
PDF Download
NCP1421 pdf
NCP1421 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 NCP1421 600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer ON
ON
NCP1421 pdf
2 NCP1422 Sync-Rect PFM Step-Up DC-DC Converter ON Semiconductor
ON Semiconductor
NCP1422 pdf
3 NCP1423 400mA Sync-Rect PFM Step-Up DC-DC Converter ON Semiconductor
ON Semiconductor
NCP1423 pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy