| Vin (Min) (V) | 2.7 |
| Vin (Max) (V) | 5.5 |
| Vout (Min) (V) | 1.2 |
| Vout (Max) (V) | 1.575 |
| Iout (Max) (A) | 0.25 |
| Regulated outputs (#) | 1 |
| Switching frequency (Min) (kHz) | 475 |
| Switching frequency (Max) (kHz) | 925 |
| Iq (Typ) (mA) | 0.055 |
| Features | Dynamic Voltage Scaling |
| Rating | Catalog |
- High Efficiency Multi-Gain Architecture: Peak Power Efficiency >85%
- Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V
- Dynamic Output Voltage Selection
- ±3% Output Voltage Accuracy
- Output Currents up to 250mA
- 2.7V to 5.5V Input Range
- Low-Supply-Current Sleep Mode
- 55μA Quiescent Supply Current in Full-Power Mode
- Soft-Start
- Short-Circuit Protection in Full-Power Mode
- Current-Limit Protection in Sleep Mode
- WSON-10 Package (3mm × 3mm × 0.8mm)
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The LM2770 is a switched capacitor step-down regulator that is ideal for powering low-voltage applications in portable systems. The LM2770 can supply load currents up to 250mA and operates over an input voltage range of 2.7V to 5.5V. This makes the LM2770 a great choice for systems powered by 1-cell Li-Ion batteries and chargers. The output voltage of the LM2770 can be dynamically switched between two output levels with a logic input pin. Output voltage pairs currently available include 1.2V/1.5V and 1.2V/1.575V. Other pairs of voltage options can be developed upon request.
LM2770 efficiency is superior to both fixed-gain switched capacitor buck regulators and low-dropout linear regulators (LDO's). Multiple fractional gains maximize power efficiency over the entire input voltage and output current ranges. The LM2770 can also be switched into a low-power sleep mode when load currents are light (≤ 20mA). In sleep mode, the charge pump is off, and the output is driven with a low-noise, low-power linear regulator.
Soft-start, short-circuit protection, current-limit protection, and thermal-shutdown protection are also included. The LM2770 is available in TI’s small 10-pin Leadless Leadframe Package (WSON-10).
