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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
C1
0.47 µF
C2
0.47 µF
VIN
B2,B3
C1+
A3
B1 C1-
A1 C2+
C3
C2-
VOUT
VOUT = 4.1 V (100 mA), 4.5 V (110 mA)
5 V (180 mA)
A2
1 µF
COUT
LM2757
M0
D3
M1
D2
GND
C1,C2
*Bump D1 is No Connect (NC)
1
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
2 Submit Documentation Feedback
Product Folder Links: LM2757
Copyright © 2007–2015, Texas Instruments Incorporated


Part Number LM2757
Description Switched-Capacitor Boost Regulator
Maker etcTI
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