The LM2705 is a micropower step-up DC-DC converter in a small 5-pin SOT-23 package. A current-limited, fixed-off-time control scheme conserves operating current, which results in high efficiency over a wide range of load conditions. The 21-V switch allows for output voltages as high as 20 V. The low 400-ns off-time permits the use of tiny, low-profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. The LM2705 is ideal for LCD panels requiring low current and high efficiency as well as white-LED applications for cellular phone back-lighting. The LM2705 device can drive up to 3 white LEDs from a single Li-Ion battery. The low peak-inductor current of the LM2705 makes it ideal for USB applications.
For all available packages, see the orderable addendum at the end of the data sheet.| Topology | Boost |
| Vin (min) (V) | 2.2 |
| Vin (max) (V) | 7 |
| Vout (min) (V) | 1.24 |
| Vout (max) (V) | 20 |
| Switch current limit (typ) (A) | 0.15 |
| Type | Converter |
| Regulated outputs (#) | 1 |
| Switching frequency (min) (kHz) | 600 |
| Switching frequency (max) (kHz) | 2500 |
| Iq (typ) (mA) | 0.235 |
| Features | Enable, Nonsynchronous rectification |
| Duty cycle (max) (%) | 76 |
| Operating temperature range (°C) | -40 to 85 |
| Rating | Catalog |
| SOT-23 (DBV) | 5 | 8.12 mm² 2.9 x 2.8 |
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