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LM7705 Datasheet

Low-Noise Negative Bias Generator

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LM7705
SNVS420D – NOVEMBER 2008 – REVISED MAY 2018
LM7705 Low-Noise Negative Bias Generator
1 Features
1 Regulated Output Voltage 0.232 V
• Output Voltage Tolerance 5%
• Output Voltage Ripple 4 mVPP
• Supply Voltage 3 V to 5.25 V
• Conversion Efficiency Up to 98%
• Quiescent Current 78 µA
• Shutdown Current 20 nA
• Turnon Time 500 µs
• Operating Temperature Range 40°C to 125°C
• 8-Pin VSSOP Package
2 Applications
• True Zero Amplifier Outputs
• Portable Instrumentation
• Low-Voltage Split-Power Supplies
3 Description
The LM7705 device is a switched capacitor voltage
inverter with a low noise, 0.23 V fixed negative
voltage regulator. This device is designed to be used
with low voltage amplifiers to enable the amplifiers
output to swing to zero volts. The 0.23 V is used to
supply the negative supply pin of an amplifier while
maintaining less then 5.5 V across the amplifier. Rail-
to-Rail output amplifiers cannot output zero volts
when operating from a single-supply voltage and can
result in error accumulation due to amplifier output
saturation voltage being amplified by following gain
stages. A small negative supply voltage will prevent
the amplifiers output from saturating at zero volts and
will help maintain an accurate zero through a signal
processing chain. Additionally, when an amplifier is
used to drive an input of the ADC, the amplifier can
output a zero voltage signal and the full input range
of an ADC can be used. The LM7705 device has a
shutdown pin to minimize standby power
consumption.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM7705
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
+V low voltage
amplifier
+V
+ In +
CFLY
- In -
-V
true zero
output voltage
shutdown
CRES
CF+ CF-
VDD
SD VOUT
LM7705
CRES
VSS
VSS
-0.23V
COUT
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

LM7705 Datasheet Preview

LM7705 Datasheet

Low-Noise Negative Bias Generator

No Preview Available !

LM7705
SNVS420D – NOVEMBER 2008 – REVISED MAY 2018
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......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 ESD Ratings.............................................................. 3
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 3.3-V Electrical Characteristics ................................. 4
6.6 5-V Electrical Characteristics .................................... 5
6.7 Typical Characteristics .............................................. 6
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 10
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Application .................................................. 16
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 19
10.1 Layout Guidelines ................................................. 19
10.2 Layout Examples................................................... 19
11 Device and Documentation Support ................. 20
11.1 Community Resources.......................................... 20
11.2 Trademarks ........................................................... 20
11.3 Electrostatic Discharge Caution ............................ 20
11.4 Glossary ................................................................ 20
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 C (September 2015) to Revision D
Page
• Deleted 'Maximum Output Current 26 mA' from Features list ............................................................................................... 1
• Deleted IO_MAX spec from 3.3-V Electrical Characteristics and 5-V Electrical Characteristics tables.................................. 4
Changes from Revision B (March 2013) to Revision C
Page
• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
Changes from Revision A (November 2008) to Revision B
Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................. 19
2 Submit Documentation Feedback
Product Folder Links: LM7705
Copyright © 2008–2018, Texas Instruments Incorporated


Part Number LM7705
Description Low-Noise Negative Bias Generator
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