Switch. TPS22946 Datasheet

TPS22946 Datasheet PDF


Part

TPS22946

Description

Current-Limited Load Switch

Manufacture

etcTI

Page 30 Pages
Datasheet
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TPS22946 Datasheet
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TPS22946
SLVS984B – SEPTEMBER 2009 – REVISED MARCH 2015
TPS22946 Ultralow Power, Low Input Voltage, Current-Limited Load Switch
With Shutoff, Auto-Restart, and Overcurrent Condition Time-Out
1 Features
1 Ultralow Quiescent Current 1 μA (Typical)
at VIN = 1.8 V
• Input Voltage Range: 1.62 V to 5.5 V
• Low ON-Resistance
– rON = 300 mat VIN = 5.5 V
– rON = 400 mat VIN = 3.3 V
– rON = 500 mat VIN = 2.5 V
– rON = 600 mat VIN = 1.8 V
• Selectable Minimum Current Limit:
155 mA, 70 mA, or 30 mA
• Integrated Inrush Current Time-out (8 ms)
• Shutdown Current: < 1 μA
• Thermal Shutdown
• Fault Blanking
• Auto Restart
• Overcurrent Condition Time-out (Automatic
Disable for Permanent Overcurrent)
• 1.8-V Compatible Control Input
• ESD Performance Tested Per JESD 22
– 6000-V Human-Body Model
(A114-B, Class II)
• Tiny DSGBA Package 1.4 mm × 0.9 mm (YZP)
2 Applications
• Fingerprint Module Protection
• Portable Consumer Electronics
• Mobile Phones
• Smartphones
• Notebooks
• GPS Devices
3 Description
The TPS22946 is an ultralow power load switch that
provides protection to systems and loads in high-
current conditions. The device contains a 300-m
current-limited P-channel MOSFET that can operate
over an input voltage range of 1.62 V to 5.5 V. The
switch is controlled by an on/off input (ON), which can
interface directly with low-voltage control signals. The
TPS22946 includes thermal shutdown protection that
prevents damage to the device when a continuous
over-current condition causes excessive heating by
turning off the switch.
When the switch current reaches the maximum limit,
the TPS22946 operates in a constant-current mode to
prohibit excessive currents from causing damage.
The current limit can be selected using the CL input:
a high CL input sets the current limit to 155 mA, a low
CL input sets the current limit to 70 mA, and a
floating CL input sets the current limit to 30 mA.
If the constant current condition persists after 10 ms,
the switch is turned off and the fault signal pin (OC) is
pulled low. The TPS22946 has an auto-restart feature
which turns the switch on again after 70 ms if the ON
pin is still active. If the TPS22946 remains in an over-
current condition for 5 seconds, the device shuts off
until it is turned on again by setting the ON control
signal off and then on.
If the device is used to protect an LDO, the inrush
current required by the LDO at startup can, in some
cases, exceed the current limit and initiate a blanking
(current limiting) condition. The TPS22946 provides
allowance for this scenario during startup of the LDO
by temporarily increasing the current limit to 435 mA
for 8 ms after the load switch is enabled.
The TPS22946 is available in space-saving 6-pin
DSBGA (YZP) package. The device is characterized
for operation over the free-air temperature range of
–40°C to 85°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS22946
DSBGA (6)
0.90 mm × 1.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
Power
Supply
VIN VOUT
CIN CLOAD
RLOAD
CL
ON
OFF
ON
GND
OC
VDD
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.

TPS22946 Datasheet
TPS22946
SLVS984B – SEPTEMBER 2009 – REVISED MARCH 2015
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 .......................................... 6
6.7 Typical Characteristics .............................................. 7
7 Parameter Measurement Information ................ 11
8 Detailed Description ............................................ 12
8.1 Overview ................................................................. 12
8.2 Functional Block Diagram ....................................... 12
8.3 Feature Description................................................. 13
8.4 Device Functional Modes........................................ 21
9 Application and Implementation ........................ 25
9.1 Application Information............................................ 25
9.2 Typical Application ................................................. 25
10 Power Supply Recommendations ..................... 27
11 Layout................................................................... 27
11.1 Layout Guidelines ................................................. 27
11.2 Layout Example .................................................... 27
12 Device and Documentation Support ................. 28
12.1 Trademarks ........................................................... 28
12.2 Electrostatic Discharge Caution ............................ 28
12.3 Glossary ................................................................ 28
13 Mechanical, Packaging, and Orderable
Information ........................................................... 28
4 Revision History
Changes from Revision A (February 2010) to Revision B
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
2 Submit Documentation Feedback
Product Folder Links: TPS22946
Copyright © 2009–2015, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS22946 SLVS984B – SEPTEM BER 2009 – REVISED MARCH 2015 TPS2294 6 Ultralow Power, Low Input Voltage, Cu rrent-Limited Load Switch With Shutoff, Auto-Restart, and Overcurrent Conditio n Time-Out 1 Features •1 Ultralow Qu iescent Current 1 μA (Typical) at VIN = 1.8 V • Input Voltage Range: 1.62 V to 5.5 V • Low ON-Resistance – rON = 300 mΩ at VIN = 5.5 V – rON = 40 0 mΩ at VIN = 3.3 V – rON = 500 m at VIN = 2.5 V – rON = 600 mΩ at VIN = 1.8 V • Selectable Minimum Curr ent Limit: 155 mA, 70 mA, or 30 mA • Integrated Inrush Current Time-out (8 m s) • Shutdown Current: < 1 μA • Th ermal Shutdown • Fault Blanking • A uto Restart • Overcurrent Condition T ime-out (Automatic Disable for Permanen t Overcurrent) • 1.8-V Compatible Con trol Input • ESD Performance Tested P er JESD 22 – 6000-V Human-Body Model (A114-B, Class II) • Tiny DSGBA Package 1.4 mm × 0.9 mm (YZP) 2 Applications • Fingerprint Module Protection • .
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