LM2771 Texas instruments

LM2771

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LM2771

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Описание

The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors. The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low (<30mA typ.), the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with efficiencies similar to an LDO.

Low-Noise Fixed Frequency Operation
1.5V Output Voltage
Li-Ion (3.6V) to 1.5V with 81% Efficiency
1.7% Output Voltage Accuracy
Very Low Output Ripple: 8mV @ 250mA
Output Currents up to 250mA
2.7V to 5.5V Input Range
Shutdown Disconnects Load from V_IN
1.1MHz Switching Frequency
No Inductors…Small Solution Size
Current Limit and Thermal Protection
WSON-10 Package (3mm × 3mm × 0.8mm)

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Vin (min) (V)	2.7
Vin (max) (V)	5.5
Vout (min) (V)	1.5
Vout (max) (V)	1.5
Iout (max) (A)	0.25
Regulated outputs (#)	1
Switching frequency (min) (kHz)	800
Switching frequency (max) (kHz)	1400
Iq (typ) (mA)	0.045
Features	Adjustable current limit
Operating temperature range (°C)	-30 to 110
Rating	Catalog
Type	Charge pump