LM2757

1 µF

0.47 µF

1.0 µF

0.47 µF

*Bump D1 is (NC) No Connect

B2,B3

A3

B1

A1

C3

C1,C2

A2

GND

5.0V (180 mA)

M0

D3

M1

D2

LM2757

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SNVS536D – OCTOBER 2007 – REVISED AUGUST 2009

LM2757 Switched Capacitor Boost Regulator with High Impedance Output in Shutdown

Check for Samples: LM2757

1

FEATURES

2

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Dual gain converter (2x, 3/2x) with up to 93%

•

Tiny 1.2 mm X 1.6 mm X 0.4 mm pitch,

Efficiency.

12–bump micro SMD package.

•

Inductorless solution uses only 4 small

APPLICATIONS

ceramic capacitors.

•

USB/USB-OTG/HDMI Power

•

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Supercapacitor Charger

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True input-output and output-input disconnect.

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Keypad LED Drive

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Up to 180 mA output current capability (5V).

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Audio amplifier power supply

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Selectable 4.1V, 4.5V or 5.0V output.

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Low-current Camera Flash

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Pre-regulation minimizes input current ripple.

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General Purpose Li-Ion-to-5V Conversion

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1.24 MHz switching frequency for a low-noise,

low-ripple output voltage.

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Cellular Phone SIM cards

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Integrated Over Current and Thermal

Shutdown Protection.

DESCRIPTION

The LM2757 is a constant frequency pre-regulated switched-capacitor charge pump that operates at 1.25 MHz to

produce a low-noise regulated output voltage. The device can be configured to provide up to 100 mA at 4.1V,

110 mA at 4.5V, or 180 mA at 5V. Excellent efficiency is achieved without the use of an inductor by operating the

charge pump in a gain of either 3/2 or 2 according to the input voltage and output voltage option selection.

require the regulated output bus to be driven by another supply while the LM2757 is shut down.

A perfect fit for space-constrained, battery-operated applications, the LM2757 requires only 4 small, inexpensive

ceramic capacitors. LM2757 is a tiny 1.2 mm X 1.6 mm 12–bump micro SMD device. Built in soft-start, over-

current protection, and thermal shutdown features are also included in this device.

Typical Application Circuit

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.