TPS22951 Datasheet, PDF (1/13 Pages) Texas Instruments – CURRENT-LIMITED 1-Ω SMART-LOAD SWITCH

TPS22951
www.ti.com................................................................................................................................................ SLVS788A – FEBRUARY 2009 – REVISED MARCH 2009
CURRENT-LIMITED 1-Ω SMART-LOAD SWITCH
FEATURES
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• 1-Ω P-Channel MOSFET
• 300-mA Continuous Source Current
• Thermal and Short-Circuit Protection
• 600-mA Current Limit
• Operating Range: V_CC = 2.8 V to 5.3 V
• 41-µs Typical Rise Time
• 10-µA Maximum Standby Supply Current
• Ambient Temperature Range: –40°C to 85°C
• ESD Performance Tested Per JESD 22
– 4000-V Human-Body Model (HBM)
– 400-V Machine Model (MM)
– 1000-V Charged-Device Model (CDM)
YFP PACKAGE
(TOP-THROUGH VIEW)
YFP PACKAGE
(TOP VIEW)
A ^V_CC PWR
B GND EN
C POK DET
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Ball A1
Index Area
DESCRIPTION/ORDERING INFORMATION
The TPS22951 smart-load switch is intended for
applications where heavy capacitive loads and short
circuits are likely to be encountered. This device
incorporates a 1-Ω P-channel MOSFET power switch
for power distribution. The switch is controlled by a
logic enable (EN) input and an accessory detect
(DET) pin. The switch is active when EN is high and
DET is low. The switch is disabled if EN is low or
DET is high. A low power state is achieved by driving
EN high.
When the output load exceeds the current-limit
threshold or a short is present, the device limits the
output current to a safe level by increasing the on
resistance of the power switch. When continuous
heavy overloads and short circuits increase the power
dissipation in the switch, causing the junction
temperature to rise, a thermal-protection circuit shuts
off the switch to prevent damage. The device
recovers from a thermal shutdown once the device
has cooled sufficiently, but the switch remains OFF
until EN is toggled. This smart-load switch is
designed to set current limit at 600-mA maximum.
TERMINAL FUNCTIONS
BALL
NO. NAME
DESCRIPTION
A1 V_CC Supply voltage
A2 PWR Power switch output
B1 GND Ground
B2 EN Enable input⁽¹⁾
C1
POK
Power OK switch status open-drain output, active
low
C2 DET Accessory detect, active low
(1) DET must be low for a minimum of 2 µs before EN is pulled
high (see Timing Requirements).
T_A
–40°C to 85°C
ORDERING INFORMATION
PACKAGE ^{(1) (2)}
ORDERABLE PART NUMBER
WCSP – YFP
Tape and reel TPS22951YFPR
TOP-SIDE MARKING
_ _347
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated