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LM2776 Datasheet

Switched Capacitor Inverter

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LM2776
SNVSA56B – MAY 2015 – REVISED FEBRUARY 2017
LM2776 Switched Capacitor Inverter
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
2.7 V to 5.5 V
2.2 PF
Typical Application
LM2776
VIN VOUT
-VIN @ up to 200mA
EN C1+
2.2 PF
GND
C1-
1 PF
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.
space
space
space
Output Impedance vs Input Voltage
IOUT = 100 mA
5.0
4.5
TA = -40°C
TA = 25°C
4.0 TA = 85°C
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
D005
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

LM2776 Datasheet Preview

LM2776 Datasheet

Switched Capacitor Inverter

No Preview Available !

LM2776
SNVSA56B – MAY 2015 – REVISED FEBRUARY 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Switching Characteristics .......................................... 5
6.7 Typical Characteristics ............................................. 5
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 10
8 Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Application - Voltage Inverter ..................... 11
9 Power Supply Recommendations...................... 15
10 Layout................................................................... 15
10.1 Layout Guidelines ................................................. 15
10.2 Layout Example .................................................... 15
11 Device and Documentation Support ................. 16
11.1 Device Support...................................................... 16
11.2 Receiving Notification of Documentation Updates 16
11.3 Community Resources.......................................... 16
11.4 Trademarks ........................................................... 16
11.5 Electrostatic Discharge Caution ............................ 16
11.6 Glossary ................................................................ 16
12 Mechanical, Packaging, and Orderable
Information ........................................................... 16
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (February 2016) to Revision B
Page
• Added link for TIDA-01063 reference design ......................................................................................................................... 1
Changes from Original (May 2015) to Revision A
Page
• Changed Equation 1 from "ROUT = RSW..." to "ROUT = (2 × RSW)..."....................................................................................... 12
2 Submit Documentation Feedback
Product Folder Links: LM2776
Copyright © 2015–2017, Texas Instruments Incorporated


Part Number LM2776
Description Switched Capacitor Inverter
Maker etcTI
Total Page 24 Pages
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