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).

• 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
• 55A 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)

All trademarks are the property of their respective owners.

• 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

LM2770的完整型号有：LM2770SD-1215/NOPB，以下是这些产品的关键参数及官网采购报价：

LM2770SD-1215/NOPB，工作温度：-30 to 105，封装：WSON (DSC)-10，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM2770SD-1215/NOPB的批量USD价格：.359（1000+）

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