NCP1421: Boost Converter, Sync-Rect, PFM, DC-DC, 600 mA, 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 50nA. Ring-Killer is also integrated to eliminate the high-frequency ringing in discontinuous conduction mode. In addition to 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 μA. This device is available in the compact and low Micro8 package.

Features
  • High Efficiency:94% for 3.3 V Output at 200 mA from 2.0 V Input84% 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)
  • True-Cutoff Function Reduces Device Shutdown Current to typically 50nA
  • Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
  • High Accuracy Reference Output, 1.2V 1 1.5%, can supply 2.5mA Loading Current when VOUT > 3.3V
  • Low Quiescent Current of 8.5 µA
  • Integrated Low-Battery Detector
  • Open Drain Low -Battery Detector Output
  • 1.0V Startup at No Load Guaranteed
  • Output Voltage from 1.5V to 5.0V Adjustable
  • 1.5 A Cycle-by-Cycle Current Limit
  • Multi-function Logic Controlled Shutdown Pin
  • On Chip Thermal Shutdown with Hysteresis
  • Output Current up to 600mA at VIN=2.5V and VOUT=3.3V
  • Housed in Space Saving and Low Profile Micro8 package
  • Pb-Free Package is Available
Applications
  • Personal Digital Assistants (PDA)
  • Camcorders and Digital Still Cameras
  • Handheld Digital Audio Products
  • Handheld Instruments
  • Conversion from one to two Alkaline, NiMH, NICd Battery Cells to 3.0-5.0V or one Lithium-ion cell to 5.0V
Application Notes (1)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1421/2 Reference Designs for High-Power White LED Flash ApplicationsAND8171/D (46.0kB)0
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Boost Converter, Sync-Rect, PFM, DC-DC, 600 mA, with True-Cutoff and Ring-KillerNCP1421/D (116.0kB)6
Evaluation Board Documents (9)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1421EVB BILL OF MATERIALSNCP1421EVB_BOM.REV1.PDF (70.0kB)1
NCP1421EVB GERBER LAYOUT FILES (ZIP FORMAT)NCP1421EVB_GERBER.REV1.ZIP (180.0kB)1
NCP1421EVB SCHEMATICNCP1421EVB_SCHEMATIC.REV1.PDF (126.0kB)1
NCP1421EVB TEST PROCEDURENCP1421EVB_TEST_PROCEDURE.REV1.PDF (115.0kB)1
NCP1421LEDGEVB Bill of Materials ROHS CompliantNCP1421LEDGEVB_BOM_ROHS.PDF (38.0kB)0
NCP1421LEDGEVB Gerber Layout Files (Zip Format)NCP1421LEDGEVB_GERBER.ZIP (25.0kB)0
NCP1421LEDGEVB ManualEVBUM2135/D (148.0kB)1
NCP1421LEDGEVB SchematicNCP1421LEDGEVB_SCHEMATIC.PDF (866.0kB)0
NCP1421LEDGEVB Test ProcedureNCP1421LEDGEVB_TEST_PROCEDURE.PDF (68.0kB)0
Package Drawings (1)
Document TitleDocument ID/SizeRevision
Micro 8 lead Surface Mount846A-02 (57.7kB)J
Evaluation/Development Tool Information
ProductStatusComplianceShort Description
NCP1421EVBActiveUp to 600 mA DC-DC Converter Evaluation Board
NCP1421LEDGEVBActivePb-freeUp to 600mA DC-DC Converter Evaluation Board
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1421DMR2GActivePb-free Halide freeMicro8™846A-021Tape and Reel4000$0.7333
Specifications
ProductTopologyControl ModeVCC Min (V)VCC Max (V)VO Typ (V)IO Typ (A)Efficiency (%)fSW Typ (kHz)
NCP1421DMR2GStep-UpCurrent/Voltage Mode15.51.5 to 5.00.6Up to 94Up to 1200
Boost Converter, Sync-Rect, PFM, DC-DC, 600 mA, with True-Cutoff and Ring-Killer (116.0kB) NCP1421
NCP1421/2 Reference Designs for High-Power White LED Flash Applications NTJS3157N
NCP1421EVB BOM NCP1421EVB
NCP1421EVB GERBER NCP1421EVB
NCP1421EVB SCHEMATIC NCP1421EVB
NCP1421EVB TEST PROCEDURE NCP1421EVB
NCP1421LEDGEVB BOM ROHS NCP1421LEDGEVB
NCP1421LEDGEVB GERBER NCP1421LEDGEVB
EVBUM2135/D - 148 NCP1421LEDGEVB
NCP1421LEDGEVB SCHEMATIC NCP1421LEDGEVB
NCP1421LEDGEVB TEST PROCEDURE NCP1421LEDGEVB
Micro 8 lead Surface Mount CM1216