NCP1400A

Features:

• Extremely Low Start−Up Voltage of 0.8 V
• Operation Down to Less than 0.2 V
• Only Four External Components for Simple Highly Efficient Converters
• Up to 100 mA Output Current Capability
• Fixed Frequency Pulse Width Modulation Operation
• Phase Compensated Error Amplifier for Stable Converter Operation
• Chip Enable Power Down Capability for Extended Battery Life
• Pb−Free Packages are Available



Application

• Cellular Telephones
• Pagers
• Personal Digital Assistants
• Electronic Games
• Digital Cameras
• Camcorders
• Handheld Instruments
• White LED Torch Light



Pinout




Specifications

Rating	Symbol	Value	Unit
Power Supply Voltage (Pin 2)	VOUT	-0.3 to 6.0	V
Input/Output Pins   LX(Pin5)   LXPeak Sink Current	VLX ILX	-0.3 to 6.0 400	V mA
CE(Pin1) Input Voltage Range Input Current Range	VCE ICE	-0.3 to 6.0 -150 to 150	V mA
Thermal Resistance Junction to Air	RBJA	250
Operating Ambient Temperature Range (Note 2)	TA	-40 to +85	/W
Operating Junction Temprature Range	TJ	-40 to +125
Storage Temperature Range	Tstg	-55 to +150

Description

The NCP1400A series are micropower step−up DC to DC converters that are specifically designed for powering portable equipment from one or two cell battery packs. These devices are designed to start−up with a cell voltage of 0.8 V and operate down to less than 0.2 V. With only four external components, this series allows a simple means to implement highly efficient converters that are capable of up to 100 mA of output current.

Each device NCP1400A consists of an on−chip fixed frequency oscillator, pulse width modulation controller, phase compensated error amplifier that ensures converter stability with discontinuous mode operation, soft−start, voltage reference, driver, and power MOSFET switch with current limit protection. Additionally, a chip enable feature of NCP1400A  is provided to power down the converter for extended battery life.

The NCP1400A device series are available in the Thin SOT23−5 package with seven standard regulated output voltages. Additional voltages that range from 1.8 V to 4.9 V in 100 mV steps can be manufactured.