LM2703

LM2703 www.ti.com SNVS172F – FEBRUARY 2002 – REVISED MAY 2013 LM2703 Micropower Step-Up DC/DC Converter with 350mA Peak Current Limit Check for Samples: LM2703 FEATURES 1 2 350mA, 0.7Ω, Internal Switch Uses Small Surface Mount Components Adjustable Output Voltage up to 21V 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 LM2703 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 22V switch allows for output voltages as high as 21V. 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 LM2703 is ideal for LCD panels requiring low current and high efficiency as well as white LED applications for cellular phone back-lighting. The LM2703 can drive up to 4 white LEDs from a single Li-Ion battery. Typical Application Circuit VIN = Li-Ion L 10 PH D 20V 15 mA CIN 4.7 PF 51 VIN SW 4 LM2703 3 SHDN FB GND 2 R1 510k R2 33k COUT 1 PF CIN: Taiyo Yuden Ceramic COUT: Taiyo Yuden Ceramic L: Coilcraft DT1608C-103 or Murata LQY33PN100M02 (low profile) D: Motorola MBRM130LT3 Figure 1. Typical 20V Application 1 Pl...