Datasheet NCP1421 (ON Semiconductor)

NCP1421 Boost Converter - Sync-Rect, PFM, DC-DC, True-Cutoff, Ring-Killer 600 mA NCP1421 is a monolithic micropower high−frequency step−up switching converter IC specially designed for battery−operated
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hand−held electronic products up to 600 mA loading. It integrates Sync−Rect to improve efficiency and to eliminate the external
MARKING
Schottky Diode. High switching frequency (up to 1.2 MHz) allows
DIAGRAM
for a low profile, small−sized inductor and output capacitor to be 8 used. When the device is disabled, the internal conduction path from
Micro8
1421 LX or BAT to OUT is fully blocked and the OUT pin is isolated from 8
DM SUFFIX
AYWG the battery. This True−Cutoff function reduces the shutdown current
CASE 846A
1 G to typically only 50 nA. Ring−Killer is also integrated to eliminate the high−frequency ringing in discontinuous conduction mode. In 1 addition to the above, Low−Battery Detector, Logic−Controlled 1421= Specific Device Code Shutdown, Cycle−by−Cycle Current Limit and Thermal Shutdown A = Assembly Location provide value−added features for various battery−operated Y = Year W = Work Week applications. With all these functions on, the quiescent supply G = Pb−Free Package current is typically only 8.5 A. This device is available in the (Note: Microdot may be in either location) compact and low profile Micro8t package.
Features
• High Efficiency: 94% for 3.3 V Output at 200 mA from 2.5 V Input
PIN CONNECTIONS
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) FB 1 8 OUT • Output Current up to 600 mA at VIN = 2.5 V and VOUT = 3.3 V LBI/EN 2 7 LX • True−Cutoff Function Reduces Device Shutdown Current to LBO 3 6 GND typically 50 nA REF 4 5 BAT • Anti−Ringing Ring−Killer for Discontinuous Conduction Mode (Top View) • 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 A • Integrated Low−Battery Detector
ORDERING INFORMATION
• Open Drain Low−Battery Detector Output
Device Package Shipping
† • 1.0 V Startup at No Load Guaranteed NCP1421DMR2 Micro8 4000 Tape & Reel • Output Voltage from 1.5 V to 5.0 V Adjustable • NCP1421DMR2G Micro8 4000 Tape & Reel 1.5 A Cycle−by−Cycle Current Limit (Pb−Free) • Multi−function Logic−Controlled Shutdown Pin • †For information on tape and reel specifications, On Chip Thermal Shutdown with Hysteresis including part orientation and tape sizes, please • Pb−Free Package is Available refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
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 © Semiconductor Components Industries, LLC, 2009
1
Publication Order Number:
August, 2019 − Rev. 7 NCP1421/D