LM2787

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SNVS080F – JULY 2001 – REVISED MAY 2013

LM2787 Low Noise Regulated Switched Capacitor Voltage Inverter in DSBGA

Check for Samples: LM2787

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FEATURES

DESCRIPTION

The LM2787 CMOS Negative Regulated Switched

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•

Inverts and Regulates the Input Supply

Capacitor Voltage Inverter delivers a very low noise

Voltage

adjustable output for an input voltage in the range of

•

Small 8-Bump DSBGA and Thin DSBGA

+2.7V to +5.5V. Four low cost capacitors are used in

Packages

this circuit to provide up to 10mA of output current.

The regulated output for the LM2787 is adjustable

•

91% Typical Charge Pump Power Efficiency at

between

−1.5V and −5.2V. The LM2787 operates at

10mA

260 kHz (typical) switching frequency to reduce

•

Low Output Ripple

output

resistance

and

voltage

ripple.

With

an

•

Shutdown Lowers Quiescent Current to 0.05

operating current of only 400 µA (charge pump power

µA (Typical)

efficiency greater than 90% with most loads) and 0.05

µA typical shutdown current, the LM2787 provides

ideal performance for cellular phone power amplifier

APPLICATIONS

bias and other low current, low noise negative voltage

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Wireless Communication Systems

needs. The device comes in small 8-Bump DSBGA

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Cellular Phone Power Amplifier Biasing

and thin DSBGA packages.

•

Interface Power Supplies

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Handheld Instrumentation

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Laptop Computers and PDA's

Typical Application Circuit and Connection Diagram

8-Bump DSBGA (Top View)

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PRODUCTION DATA information is current as of publication date.

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Products conform to specifications per the terms of the Texas

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