Switch. TPS22949A Datasheet

TPS22949A Datasheet PDF


Part

TPS22949A

Description

Current-Limited Load Switch

Manufacture

etcTI

Page 30 Pages
Datasheet
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TPS22949A Datasheet
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TPS22949, TPS22949A
SLVS908D – FEBRUARY 2009 – REVISED JUNE 2015
TPS22949x Current-Limited Load Switch With Low Noise Regulation Capability
1 Features
1 Integrated Current Limiter
– Input Voltage Range: 1.62 V to 4.5 V
– Low ON-Resistance
– rON = 300-mat VIN = 4.5 V
– rON = 350-mat VIN = 3.3 V
– rON = 400-mat VIN = 2.5 V
– rON = 600-mat VIN = 1.8 V
– Integrated 100-mA Minimum Current Limit
– Undervoltage Lockout
– Fast-Current Limit Response Time
– Integrated Fault Blanking and Auto Restart
• Stable Without Current Limiter Output Capacitor
(TPS22949A Only)
• Integrated Low-Noise RF LDO
– Input Voltage Range: 1.62 V to 4.5 V
– Low Noise: 50 μVrms (10 Hz to 100 kHz)
– 80-dB VIN PSRR (10 Hz to 10 kHz)
– Fast Start-Up Time: 130 μs
– Low Dropout 100 mV at Iload =100 mA
– Integrated Output Discharge
– Stable With 2.2-μF Output Capacitor
• 1.8-V Compatible Control Input Threshold
• ESD Performance Tested Per JESD 22
– 3500 V Human Body Model
(A114-B, Class II)
– 1000 V Charged Device Model
(C101)
• Tiny 8-Terminal YZP Package (1.9 mm × 0.9 mm,
0.5-mm Pitch, 0.5-mm Height) and WSON-8
(DRG) 3.0 mm × 3.0 mm
2 Applications
• Fingerprint Module Protection
• Portable Consumer Electronics
• Smart Phones
• Notebooks
• Control Access Systems
3 Description
The TPS22949 and TPS22949A are devices that
provide protection to systems and loads in high-
current conditions. The device contains a 500-m
current-limited P-channel MOSFET that can operate
over an input voltage range of 1.62 V to 4.5 V as well
as a low-dropout (LDO) regulator with a fixed output
voltage of 1.8 V.
The switch is controlled by an on/off input (EN1),
which can interface directly with low-voltage control
signals. When the switch current reaches the
maximum limit, the TPS22949/TPS22949A operates
in a constant-current mode to prohibit excessive
currents from causing damage. If the constant current
condition persists after 12 ms, these devices shut off
the switch and pull the fault signal pin (OC) low. The
TPS22949/TPS22949A has an auto-restart feature
that turns the switch on again after 70 ms if the EN1
pin is still active.
The output of the current limiter is internally
connected to an RF low-dropout (LDO) regulator that
offers good AC performance with very low ground
current, good power supply rejection ratio (PSRR),
low noise, fast start-up, and excellent line and load
transient response. The output of the regulator is
stable with ceramic capacitors. This LDO uses a
precision voltage reference and feedback loop to
achieve overall accuracy of 2% over all load, line,
process, and temperature variations.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS22949
DSBGA (8)
1.90 mm × 0.90 mm
TPS22949A
DSBGA (8)
WSON (8)
1.90 mm × 0.90 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
TPS22949
TPS22949A
VIN VIN VOUTCL
VOUTCL
EN1
CIN
EN2
CCL
V+ V+ VOUTLDO
GND
OC
CLDO
VOUTLDO
(1.8 V, 100 mA)
OC
RPU
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.

TPS22949A Datasheet
TPS22949, TPS22949A
SLVS908D – FEBRUARY 2009 – REVISED JUNE 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Current Limiter Electrical Characteristics.................. 6
7.7 Low-Noise LDO Regulator Electrical Characteristics 7
7.8 Current Limiter Switching Characteristics ................. 7
7.9 Typical Characteristics .............................................. 8
8 Detailed Description ............................................ 15
8.1 Overview ................................................................. 15
8.2 Functional Block Diagram ....................................... 15
8.3 Feature Description................................................. 16
8.4 Device Functional Modes........................................ 17
9 Application and Implementation ........................ 18
9.1 Application Information............................................ 18
9.2 Typical Application ................................................. 19
9.3 System Examples ................................................... 21
10 Power Supply Recommendations ..................... 22
11 Layout................................................................... 22
11.1 Layout Guidelines ................................................. 22
11.2 Layout Example .................................................... 22
12 Device and Documentation Support ................. 23
12.1 Related Links ........................................................ 23
12.2 Community Resources.......................................... 23
12.3 Trademarks ........................................................... 23
12.4 Electrostatic Discharge Caution ............................ 23
12.5 Glossary ................................................................ 23
13 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
Changes from Revision C (January 2010) to Revision D
Page
• Added 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
• Deleted Dissipation Ratings table........................................................................................................................................... 5
2 Submit Documentation Feedback
Copyright © 2009–2015, Texas Instruments Incorporated
Product Folder Links: TPS22949 TPS22949A


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS22949, TPS22949A SLVS908D – FEBRUARY 2009 – REVISED JUNE 201 5 TPS22949x Current-Limited Load Switch With Low Noise Regulation Capability 1 Features •1 Integrated Current Limi ter – Input Voltage Range: 1.62 V to 4.5 V – Low ON-Resistance – rON = 3 00-mΩ at VIN = 4.5 V – rON = 350-m at VIN = 3.3 V – rON = 400-mΩ at VIN = 2.5 V – rON = 600-mΩ at VIN = 1.8 V – Integrated 100-mA Minimum C urrent Limit – Undervoltage Lockout Fast-Current Limit Response Time – Integrated Fault Blanking and Auto Res tart • Stable Without Current Limiter Output Capacitor (TPS22949A Only) • Integrated Low-Noise RF LDO – Input V oltage Range: 1.62 V to 4.5 V – Low N oise: 50 μVrms (10 Hz to 100 kHz) – 80-dB VIN PSRR (10 Hz to 10 kHz) – Fa st Start-Up Time: 130 μs – Low Dropo ut 100 mV at Iload =100 mA – Integrat ed Output Discharge – Stable With 2.2-μF Output Capacitor • 1.8-V Compatible Control Input Threshold • ESD Performa.
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