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LM27762 Datasheet Preview

LM27762 Datasheet

Low-Noise Positive and Negative Output Integrated Charge Pump Plus LDO

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LM27762
SNVSAF7B – AUGUST 2016 – REVISED FEBRUARY 2017
LM27762 Low-Noise Positive and Negative Output Integrated
Charge Pump Plus LDO
1 Features
1 Generates Low-Noise Adjustable Positive Supply
Voltage Between 1.5 V and 5 V and Negative
Supply Voltage Between –1.5 V and –5 V
• Input Voltage Range 2.7 V to 5.5 V
• ±250-mA Output Current
• Inverting Charge Pump Followed by Negative
LDO
• 2-MHz Low-Noise Fixed-Frequency Operation
• 2.5-Inverter Output Impedance, VIN = 5 V
• Negative LDO Dropout Voltage 30 mV at 100 mA,
VOUT = –5 V
• Positive LDO with 45-mV Dropout Voltage at 100
mA, VOUT = 5 V
• 390-µA Quiescent Current (Typical)
• Shutdown Quiescent Current to 0.5 µA (Typical)
• Current Limit and Thermal Protection
• Power Good Pin (Active Low)
• Create a Custom Design Using the LM27762 With
the WEBENCH® Power Designer
2 Applications
• Hi-Fi Audio Headphone Amplifiers
• Operational Amplifier Power Biasing
• Powering Data Converters
• Wireless Communication Systems
• Interface Power Supplies
• Handheld Instrumentation
3 Description
The LM27762 delivers very low-noise positive and
negative outputs that are adjustable between ±1.5 V
and ±5 V. Input-voltage range is from 2.7 V to 5.5 V,
and output current goes up to ±250 mA. With an
operating current of only 390 µA and 0.5-µA typical
shutdown current, the LM27762 provides ideal
performance for power amplifier and DAC bias and
other high-current, low-noise negative voltage needs.
The device provides a small solution size with few
external components.
Negative voltage is generated by a regulated
inverting charge pump followed by a low-noise
negative LDO. The inverting charge pump of the
LM27762 device operates at 2-MHz (typical)
switching frequency to reduce output resistance and
voltage ripple. Positive voltage is generated from the
input by a low-noise positive LDO.
Positive and negative outputs of LM27762 have
dedicated enable inputs. These outputs support
independent timing for the positive and negative rails
for specific system power-sequence needs. Enable
inputs can be also shorted together and connected to
the input voltage. The LM27762 has an optional
Power Good feature.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM27762
WSON (12)
2.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
Simplified Schematic
2.7 V to 5.5 V
VIN
CVIN
RPU
PGOOD
C1-
C1
C1+
EN+
EN-
LM27762
CP
1.5 V to 5 V
OUT+
R1
FB+
GND
R2
R4
FB-
OUT-
R3
-1.5 V to -5 V
CCP
COUT+
COUT-
Copyright © 2016, Texas Instruments Incorporated
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

LM27762 Datasheet Preview

LM27762 Datasheet

Low-Noise Positive and Negative Output Integrated Charge Pump Plus LDO

No Preview Available !

LM27762
SNVSAF7B – AUGUST 2016 – 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 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Application ................................................. 12
9 Power Supply Recommendations...................... 17
10 Layout................................................................... 17
10.1 Layout Guidelines ................................................. 17
10.2 Layout Example .................................................... 18
11 Device and Documentation Support ................. 19
11.1 Device Support...................................................... 19
11.2 Receiving Notification of Documentation Updates 19
11.3 Community Resources.......................................... 19
11.4 Trademarks ........................................................... 19
11.5 Electrostatic Discharge Caution ............................ 19
11.6 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (September 2016) to Revision B
Page
• Added added ulinks for WEBENCH ...................................................................................................................................... 1
Changes from Original (July 2016) to Revision A
Page
• Changed "Switched Capacitor" to "Charge Pump" in title ..................................................................................................... 1
• Changed "Generates Low-Noise Adjustable Positive and Negative Supply Voltages From ±1.5 V and ±5 V" to
"Generates Low-Noise Adjustable Positive Supply Voltages Between 1.5 V and 5 V and Negative Supply Voltages
From –1.5 V to –5 V" in Features........................................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: LM27762
Copyright © 2016–2017, Texas Instruments Incorporated


Part Number LM27762
Description Low-Noise Positive and Negative Output Integrated Charge Pump Plus LDO
Maker etcTI
Total Page 29 Pages
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