NCP1521B: Buck Converter, DC-DC, 1.5 MHz, 600 mA

The NCP1521B step-down PWM DC-DC converter is optimized for portable applications powered from one cell Li-ion or three cell Alkaline/NiCd/NiMH batteries. The part is available in adjustable output voltage versions ranging from 0.9 V to 3.3 V. It uses synchronous rectification to increase efficiency and reduce external part count. The device also has a built-in 1.5 MHz (nominal) oscillator which reduces component size by allowing smaller inductors and capacitors. Automatic switching PWM/PFM mode offers improved system efficiency. Additional features include integrated soft-start, cycle-by-cycle current limiting and thermal shutdown protection. The NCP1521B is available in space saving, low profile TSOP5 and UDFN6 packages.

Features
  • 96% efficiency, 30 uA quiescent current, 0.3 uA shutdown current
  • 1.5 MHz switching frequency
  • Auto-switching between PWM and PFM mode at light load conditions
  • Adjustable output voltage from 0.9V to 3.3V
  • Best in class Low Ripple even in PFM mode
Benefits
  • Extends battery life and 'play-time'
  • Allows use of smaller inductor and capacitor
  • Low power consumption at light loading
Applications
  • Power supply for application processor
  • Power supply for processor with low core voltage
End Products
  • Cellular phones, smart phones, and PDAs
  • MP3 players and portable audio systems
  • Digital still cameras and video cameras
Application Notes (1)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1521B Step-Down Converter Simulation ProcedureAND8285/D (726.0kB)0
Package Drawings (1)
Document TitleDocument ID/SizeRevision
TSOP-5483 (32.5kB)M
Simulation Models (1)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1521B Simulation ModelNCP1521B SIMULATION MODEL (10.0kB)0
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Buck Converter, DC-DC, 1.5 MHz, 600 mANCP1521B/D (181.0kB)6
Evaluation Board Documents (5)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1521B Adjustable Output Voltage Step-Down Converter Evaluation Board User's ManualEVBUM2104/D (236.0kB)1
NCP1521BEVB Bill of Materials ROHS ComplieantNCP1521BEVB_BOM_ROHS.PDF (82.0kB)0
NCP1521BEVB Gerber Layout Files (ZipFormat)NCP1521BEVB_GERBERS.ZIP (63.0kB)0
NCP1521BEVB SchematicNCP1521BEVB_SCHEMATIC.PDF (118.0kB)0
NCP1521BEVB Test ProcedureNCP1521BEVB_TEST_PROCEDURE.PDF (141.0kB)0
Evaluation/Development Tool Information
ProductStatusComplianceShort Description
NCP1521BEVBActiveStep Down Converter Evaluation Board
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1521BSNT1GActivePb-free Halide freeTSOP-5 / SOT-23-54831Tape and Reel3000$0.21
Specifications
ProductTopologyControl ModeVCC Min (V)VCC Max (V)VO Typ (V)IO Typ (A)Efficiency (%)fSW Typ (kHz)
NCP1521BSNT1GStep-DownCurrent Mode2.75.50.9 to 3.30.6961500
Buck Converter, DC-DC, 1.5 MHz, 600 mA (181.0kB) NCP1521B
NCP1521B Step-Down Converter Simulation Procedure NCP1521B
NCP1521B Simulation Model NCP1521B
EVBUM2104/D - 236 NCP1521BEVB
NCP1521BEVB BOM ROHS NCP1521BEVB
NCP1521BEVB GERBERS NCP1521BEVB
NCP1521BEVB SCHEMATIC NCP1521BEVB
NCP1521BEVB TEST PROCEDURE NCP1521BEVB
TSOP-5 NUP4004M5