LM2770 Texas instruments

LM2770

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LM2770

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Описание

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
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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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
Operating temperature range (°C)	-30 to 105
Rating	Catalog
Type	Charge pump