LM2703

Features:

·350mA, 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




Application

·LCD Bias Supplies
·White LED Back-Lighting
·Handheld Devices
·Digital Cameras
·Portable Applications




Specifications

VIN 7.5V
SW Voltage 21V
FB Voltage 2V
SHDN Voltage 7.5V
Maximum Junction Temp. TJ 150
(Note 2)

Lead Temperature
(Soldering 10 sec.) 300
Vapor Phase
(60 sec.) 215
Infrared
(15 sec.) 220
ESD Ratings (Note 3)
Human Body Model 2kV
Machine Model (Note 4) 200V

Regulated LEDs	4
Total LED Current	60 mA
Boost Type	Inductive
Efficiency (peak)	80 %
Input Min Voltage	2.2 Volt
Input Max Voltage	7 Volt
OutputMax Voltage	20 Volt
Boost Voltage	Unregulated
LED Configuration	Series
Supply Current	0.235 mA
Switching Type	PFM
PWM BrightCtrl	Yes
Analog-V BrightCtrl	No
Ambient Light Compensation	No
RGB-LED	No
Temperature Min	-40 deg C
Temperature Max	85 deg C
RegType	Switching Regulator
PowerWise	No
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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 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 spaceconscious 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.