Input Voltage (V)

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

D005

VIN

EN

LM2776

GND

VOUT

C1+

C1-

2.2 PF

2.2 PF

1 PF

2.7 V to 5.5 V

-VIN @ up to 200mA

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2776

SNVSA56A – MAY 2015 – REVISED FEBRUARY 2016

LM2776 Switched Capacitor Inverter

1

1 Features

1

•

Input Voltage: 2.7 V to 5.5 V

•

200-mA Output Current

•

Inverts Input Supply Voltage

•

Low-Current PFM Mode Operation

•

2-MHz Switching Frequency

•

Greater than 90% Efficiency

•

Current Limit and Thermal Protection

•

No Inductors

2 Applications

•

Operational Amplifier Power Supplies

•

Interface Power Supplies

•

Data Converter Supplies

•

Audio Amplifier Power Supplies

•

Portable Electronic Devices

3 Description

The LM2776 CMOS charge-pump voltage converter

inverts a positive voltage in the range from 2.7 V to

5.5 V to the corresponding negative voltage. The

LM2776 uses three low-cost capacitors to provide

200 mA of output current without the cost, size, and

electromagnetic

interference

(EMI)

related

to

inductor-based converters.

With an operating current of only 100

μA and

operating efficiency greater than 90% at most loads,

the LM2776 provides ideal performance for battery-

powered systems requiring a high power negative

power supply.

The LM2776 has been placed in TI's 6-pin SOT-23 to

maintain a small form factor.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2776

SOT-23 (6)

2.90 mm × 1.60 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

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Typical Application

Output Impedance vs Input Voltage