LM2704 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – Micropower Step-up DC/DC Converter with 550mA Peak Current Limit

LM2704
www.ti.com
SNVS175C – MAY 2004 – REVISED MAY 2004
LM2704 Micropower Step-up DC/DC Converter with 550mA Peak Current Limit
Check for Samples: LM2704
FEATURES
1
•2 550mA, 0.7Ω, Internal Switch
• Uses Small Surface Mount Components
• Adjustable Output Voltage up to 20V
• 2.2V to 7V Input Range
• Input Undervoltage Lockout
• 0.01µA Shutdown Current
• Small 5-Lead SOT-23 Package
APPLICATIONS
• LCD Bias Supplies
• White LED Back-Lighting
• Handheld Devices
• Digital Cameras
• Portable Applications
DESCRIPTION
The LM2704 is a micropower step-up DC/DC in a small 5-lead SOT-23 package. A current limited, fixed off-time
control scheme conserves operating current resulting in high efficiency over a wide range of load conditions. The
21V switch allows for output voltages as high as 20V. The low 400ns off-time permits the use of tiny, low profile
inductors and capacitors to minimize footprint and cost in space-conscious portable applications. The LM2704 is
ideal for LCD panels requiring low current and high efficiency as well as white LED applications for cellular phone
back-lighting. The LM2704 can drive up to 8 white LEDs from a single Li-Ion battery.
Typical Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated