200 mA DC−DC Step−up Converter with Dual Low Battery Protection

NCP1417 is a monolithic micropower high frequency Boost (step−up) voltage switching converter IC specially designed for battery operated hand−held electronic products up to 200 mA loading. It integrates Synchronous Rectifier for improving efficiency as well as eliminating the external Schottky Diode. High switching frequency (up to 600 kHz) allows use of a low profile inductor and output capacitor. Dual Low−Battery Detectors and Cycle−by−Cycle Current Limit provide value−added features for various battery−operated applications. With all these functions ON, the quiescent supply current is only 9.0 A typical. This device is available in a space saving compact Micro8 package.

FEATUREs
• High Efficiency, Up to 92%, Typical
• Very Low Device Quiescent Supply Current of 9.0 μA Typical
• Built−in Synchronous Rectifier (P−FET) Eliminates One External Schottky Diode
• High Switching Frequency (Up to 600 kHz) Allows Small Size Inductor and Capacitor
• High Accuracy Reference Output, 1.19 V ±0.6% @ 25°C, Can Supply More Than 2.5 mA when VOUT ≥3.3 V
• 1.0 V Startup at No Load Guaranteed
• Output Voltage from 1.5 V to 5.5 V Adjustable
• Output Current Up to 200 mA @ Vin = 2.5 V, Vout = 3.3 V
• Multi−Function LBI/Shutdown Control Pin
• Dual Open Drain Low−Battery Detector Outputs
• 1.0 A Cycle by Cycle Current Limit
• Low Profile and Minimum External Parts
• Compact Micro8 Package

APPLICATIONs
• Personal Digital Assistants (PDA)
• Handheld Digital Audio Product
• Camcorders and Digital Still Camera
• Handheld Instrument
• Conversion from One or Two NiMH or NiCd or One Lithium−ion Cells to 3.3 V/5.0 V