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LM2757 Datasheet Preview

LM2757 Datasheet

Switched-Capacitor Boost Regulator

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LM2757

SNVS536F – OCTOBER 2007 – REVISED JULY 2015

LM2757 Switched-Capacitor Boost Regulator With High Impedance Output in Shutdown

1 Features

•1 Dual Gain Converter (2×, 3/2×) With up to 93%

Efficiency

• Inductorless Solution Uses Only 4 Small Ceramic

Capacitors

• Total Solution Area < 12 mm2

• True Input-Output and Output-Input Disconnect

• Up to 180-mA Output Current Capability (5 V)

• Selectable 4.1-V, 4.5-V or 5-V Output

• Pre-Regulation Minimizes Input Current Ripple

• 1.24-MHz Switching Frequency for Low-Noise,

Low-Ripple Output Voltage

• Integrated Overcurrent and Thermal Shutdown

Protection

2 Applications

• USB/USB-OTG/HDMI Power

• Supercapacitor Charger

• Keypad LED Drive

• Audio Amplifier Power Supply

• Low-Current Camera Flash

• General Purpose Li-Ion-to-5-V Conversion

• Cellular Phone SIM Cards

3 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 4.1 V, 110 mA at 4.5 V, or 180 mA at 5

V. 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.

The LM2757 presents a high impedance at the VOUT

pin when shut down. This allows for use in

applications that require the regulated output bus to

be driven by another supply while the LM2757 is shut

down.

The LM2757 device comes in a tiny 12-pin 0.4-mm

pitch DSBGA package. A perfect fit for space-

constrained, battery-operated applications, the device

requires only 4 small, inexpensive ceramic

capacitors. Built-in soft-start, overcurrent protection,

and thermal shutdown features are also included in

this device.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (MAX)

LM2757

DSBGA (12)

1.641 mm × 1.581 mm

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

the end of the data sheet.

Typical Application

VIN = 3 V - 5.5 V

CIN 1 µF

0.47 µF

VIN

B2,B3

C1+

B1 C1-

A1 C2+

C2-

VOUT

VOUT = 4.1 V (100 mA), 4.5 V (110 mA)

5 V (180 mA)

1 µF

COUT

LM2757

GND

C1,C2

*Bump D1 is No Connect (NC)

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.

etcTI

LM2757 Datasheet Preview

LM2757 Datasheet

Switched-Capacitor Boost Regulator

No Preview Available !

LM2757

SNVS536F – OCTOBER 2007 – REVISED JULY 2015

www.ti.com

Table of Contents

1 Features .................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Device Options....................................................... 3

6 Pin Configuration and Functions ......................... 3

7 Specifications......................................................... 4

7.1 Absolute Maximum Ratings ...................................... 4

7.2 ESD Ratings.............................................................. 4

7.3 Recommended Operating Conditions....................... 4

7.4 Thermal Information .................................................. 4

7.5 Electrical Characteristics........................................... 5

7.6 Typical Characteristics .............................................. 6

8 Detailed Description ............................................ 10

8.1 Overview ................................................................. 10

8.2 Functional Block Diagram ....................................... 10

8.3 Feature Description................................................. 10

8.4 Device Functional Modes........................................ 11

9 Application and Implementation ........................ 13

9.1 Application Information............................................ 13

9.2 Typical Application ................................................. 13

10 Power Supply Recommendations ..................... 18

11 Layout................................................................... 19

11.1 Layout Guidelines ................................................. 19

11.2 Layout Example .................................................... 19

12 Device and Documentation Support ................. 20

12.1 Device Support .................................................... 20

12.2 Documentation Support ........................................ 20

12.3 Community Resources.......................................... 20

12.4 Trademarks ........................................................... 20

12.5 Electrostatic Discharge Caution ............................ 20

12.6 Glossary ................................................................ 20

13 Mechanical, Packaging, and Orderable

Information ........................................................... 21

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (May 2013) to Revision F

Page

• Added Device Information and Pin Configuration and Functions sections, ESD Rating table, Feature Description,

Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and

Documentation Support , and Mechanical, Packaging, and Orderable Information sections. ............................................... 1

Changes from Revision D (May 2013) to Revision E

Page

• Changed layout of National Data Sheet to TI format ........................................................................................................... 18

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LM2757 Datasheet

Switched-Capacitor Boost Regulator

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Switched-Capacitor Boost Regulator

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