TPS22941 Datasheet, PDF (1/19 Pages) Texas Instruments – LOW-INPUT-VOLTAGE CURRENT-LIMITED LOAD SWITCHES WITH SHUT OFF AND AUTO-RESTART FEATURE

TPS22941, TPS22942, TPS22943, TPS22944, TPS22945
www.ti.com
SLVS832C – NOVEMBER 2008 – REVISED NOVEMBER 2009
LOW-INPUT-VOLTAGE CURRENT-LIMITED LOAD SWITCHES
WITH SHUT OFF AND AUTO-RESTART FEATURE
Check for Samples: TPS22941 TPS22942 TPS22943 TPS22944 TPS22945
FEATURES
1
• Input Voltage Range: 1.62 V to 5.5 V
• Low ON resistance
– r_ON = 0.4 Ω at V_IN = 5.5 V
– r_ON = 0.5 Ω at V_IN = 3.3 V
– r_ON = 0.6 Ω at V_IN = 2.5 V
– r_ON = 0.8 Ω at V_IN = 1.8 V
• Minimum Current Limit: 40 mA or 100 mA
• Undervoltage Lockout
• Thermal Shutdown
• Shutdown Current < 1 μA
• Fast Current Limit Response Time
• Fault Blanking
• Auto Restart
• 1.8-V Compatible Control Input Thresholds
• ESD Performance Tested Per JESD 22
– 4000-V Human-Body Model
(A114-B, Class II)
– 1000-V Charged-Device Model (C101)
• Tiny SC-70 (DCK) Package
APPLICATIONS
• Low-Current Sensor Protection
• HDMI Connector Protection
• Notebooks
• PDAs
• GPS Devices
• MP3 Players
• Peripheral Ports
DESCRIPTION
The TPS2294x load switches provide protection to
systems and loads in high-current conditions. The
devices contain a 400-mΩ current-limited P-channel
MOSFET that can operate over an input voltage
range of 1.62 V to 5.5 V. Current is prevented from
flowing when the MOSFET is off. The switch is
controlled by an on/off input (ON), which is capable of
interfacing directly with low-voltage control signals.
The TPS2294x 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 TPS22941/2/3/4/5 operates in a constant-current
mode to prohibit excessive currents from causing
damage. TPS22941/3 has a current limit of 40 mA
and TPS22942/4/5 has a current limit of 100 mA.
For the TPS22941/2/5, if the constant current
condition still persists after 10ms, these parts shut off
the switch and pull the fault signal pin (OC) low. The
TPS22941/2/5, have an auto-restart feature that turns
the switch on again after 80 ms if the ON pin is still
active. A current limit condition on the TPS22943 and
on the TPS22944 immediately pull the fault signal pin
low (OC pin) and the part remains in the
constant-current mode until the switch current falls
below the current limit.
The TPS2294x is available in a SC70-5 (DCK)
package. It is characterized for operation over the
free-air temperature range of –40°C to 85°C.
DEVICE
TPS22941
TPS22942
TPS22943
TPS22944
TPS22945
MINIMUM CURRENT LIMIT
(mA)
40
100
40
100
100
Table 1. Feature List
CURRENT LIMIT
BLANKING TIME (ms)
10
10
0
0
10
AUTO-RESTART TIME (ms)
80
80
N/A
N/A
80
ON PIN ACTIVITY
Active LOW
Active LOW
Active HIGH
Active HIGH
Active HIGH
1
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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.
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