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 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.
The LM2703 micropower step‑up DC/DC converter is supplied in a 5‑lead SOT‑23 package and delivers up to 350 mA peak current with a 21 V switch, allowing output voltages up to 20 V. It is suited for LCD bias supplies, white‑LED back‑lighting, handheld devices and other portable applications.
Key specifications include a 2.2 V‑7 V input range, 400 ns off‑time, 95 % efficiency at moderate load, and a shutdown current of only 0.01 A. The device features an adjustable output, internal current limit, and a shutdown pin for low‑power operation.
| Input voltage range | 2.2 V to 7 V |
|---|---|
| Shutdown current | 0.01 A |
| Package | 5‑lead SOT‑23 |
| Efficiency (typical) | up to 95 % |
| Switch off time | 400 ns |
The device operates from 2.2 V up to 7 V input.
Tie the SHDN pin above 1.1 V to enable the device; the pin is active low.
The shutdown current is specified as 0.01 A.