NCP1422: Boost Converter, Sync-Rect, PFM, DC-DC, 800 mA, with True-Cutoff and Ring-Killer

NCP1422 is a monolithic micropower high frequency step-up switching converter IC specifically designed for battery-operated hand-held electronic products up to 800mA 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 reduce the shutdown current to typically only 50nA. 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 typical only 8.5 uA. This device is available in compact and low profile DFN10 package.

特性

Output Current up to 800 mA at VIN = 2.5 V and VOUT = 3.3 V
High Switching Frequency, up to 1.2MHz
Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
Low Quiescent Current of 8.5 µA
1.0V Startup at No Load Guaranteed
Output Voltage from 1.5V to 5V Adjustable
1.5A Cycle by Cycle Current Limit
On Chip Thermal Shutdown with Hysteresis
Housed in Space-Saving and Low Profile DFN10 package
Pb-Free Package is Available

应用

Personal Digital Assistants (PDA)
Handheld Digital Audio Products
Camcorders and Digital Still Cameras
Conversion from one to two Alkaline, NiMH, NiCd battery cells to 3.0-5.0V or one Lithium-ion cells to 5.0V
While LED Flash for Digital Cameras

应用注释 (1)

Document Title	Document ID/Size	Revision	Revision Date
NCP1421/2 Reference Designs for High-Power White LED Flash Applications	AND8171/D (46.0kB)	0

数据表 (1)

Document Title	Document ID/Size	Revision	Revision Date
Boost Converter, Sync-Rect, PFM, DC-DC, 800 mA, with True-Cutoff and Ring-Killer	NCP1422/D (134.0kB)	3

评估板文档 (9)

Document Title	Document ID/Size	Revision
NCP1422GEVB Bill of Materials ROHS Compliant	NCP1422GEVB_BOM_ROHS (70kB)	1
NCP1422GEVB Gerber Layout Files (Zip Format)	NCP1422GEVB_GERBER (45kB)	0
NCP1422GEVB Schematic	NCP1422GEVB_SCHEMATIC (46kB)	0
NCP1422GEVB Test Procedure	NCP1422GEVB_TEST_PROCEDURE (128kB)	0
NCP1422LEDGEVB Bill of Materials ROHS Compliant	NCP1422LEDGEVB_BOM_ROHS.PDF (187.0kB)	0
NCP1422LEDGEVB Gerber Layout Files (Zip Format)	NCP1422LEDGEVB_GERBER.ZIP (43.0kB)	0
NCP1422LEDGEVB Manual	EVBUM2136/D (144.0kB)	1
NCP1422LEDGEVB Schematic	NCP1422LEDGEVB_SCHEMATIC.PDF (122.0kB)	0
NCP1422LEDGEVB Test Procedure	NCP1422LEDGEVB_TEST_PROCEDURE.PDF (159.0kB)	0