The TPS202x family of power distribution switches is intended for applications where heavy capacitive loads
and short circuits are likely to be encountered. These devices are 50-mΩ N-channel MOSFET high-side power
switches. The switch is controlled by a logic enable compatible with 5-V logic and 3-V logic. Gate drive is
provided by an internal charge pump designed to control the power-switch rise times and fall times to minimize
current surges during switching. The charge pump requires no external components and allows operation from
supplies as low as 2.7 V.
When the output load exceeds the current-limit threshold or a short is present, the TPS202x limits the output
current to a safe level by switching into a constant-current mode, pulling the overcurrent (OC
) logic output low.
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. Recovery from
a thermal shutdown is automatic once the device has cooled sufficiently. Internal circuitry ensures the switch
remains off until valid input voltage is present.
The TPS202x devices differ only in short-circuit current threshold. The TPS2020 limits at 0.3-A load, the
TPS2021 at 0.9-A load, the TPS2022 at 1.5-A load, the TPS2023 at 2.2-A load, and the TPS2024 at 3-A load
(see Available Options). The TPS202x is available in an 8-pin small-outline integrated-circuit (SOIC) package
and in an 8-pin dual-in-line (DIP) package and operates over a junction temperature range of –40°C to 125°C.
GENERAL SWITCH CATALOG
33 mΩ, single
80 mΩ, single
TPS201xA
TPS202x
TPS203x
TPS2014
TPS2015
TPS2041
TPS2051
TPS2045
TPS2055
0.2 A – 2 A
0.2 A – 2 A
0.2 A – 2 A
600 mA
1 A
500 mA
500 mA
250 mA
250 mA
80 mΩ, dual
IN1
IN2
260 mΩ
1.3 Ω
OUT
TPS2042
TPS2052
TPS2046
TPS2056
TPS2100/1
IN1 500 mA
IN2 10 mA
TPS2102/3/4/5
IN1 500 mA
IN2 100 mA
500 mA
500 mA
250 mA
250 mA
80 mΩ, triple
TPS2043
TPS2053
TPS2047
TPS2057
500 mA
500 mA
250 mA
250 mA
80 mΩ, quad
TPS2044
TPS2054
TPS2048
TPS2058
500 mA
500 mA
250 mA
250 mA
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1999, Texas Instruments Incorporated
1
TPS2020, TPS2021, TPS2022, TPS2023, TPS2024
MAXIMUM CONTINUOUS
POWER-DISTRIBUTION SWITCHES
SLVS175A – DECEMBER 1998 – REVISED NOVEMBER 1999
AVAILABLE OPTIONS
RECOMMENDED
T
A
–40°C to 85°CActive low
†
The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2020DR)
ENABLE
LOAD CURRENT
TPS2020 functional block diagram
IN
Charge
Pump
(A)
0.20.3TPS2020DTPS2020P
0.60.9TPS2021DTPS2021P
11.5TPS2022DTPS2022P
1.52.2TPS2023DTPS2023P
2 3TPS2024DTPS2024P
Power Switch
TYPICAL SHORT-CIRCUIT
CURRENT LIMIT AT 25°C
(A)
CS
PACKAGED DEVICES
SMALL OUTLINE
†
(D)
†
OUT
PLASTIC DIP
(P)
EN
GND
†
Current Sense
UVLO
Driver
Thermal
Sense
Terminal Functions
TERMINAL
NAME
EN4IEnable input. Logic low turns on power switch.
GND1IGround
IN2, 3IInput voltage
OC5OOvercurrent. Logic output active low
OUT6, 7, 8OPower-switch output
NO.
D OR P
I/ODESCRIPTION
Current
Limit
OC
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
detailed description
power switch
TPS2020, TPS2021, TPS2022, TPS2023, TPS2024
POWER-DISTRIBUTION SWITCHES
SLVS175A – DECEMBER 1998 – REVISED NOVEMBER 1999
The power switch is an N-channel MOSFET with a maximum on-state resistance of 50 mΩ (V
Configured as a high-side switch, the power switch prevents current flow from OUT to IN and IN to OUT when
disabled.
charge pump
An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate
of the MOSFET above the source. The charge pump operates from input voltages as low as 2.7 V and requires
very little supply current.
driver
The driver controls the gate voltage of the power switch. T o limit large current surges and reduce the associated
electromagnetic interference (EMI) produced, the driver incorporates circuitry that controls the rise times and
fall times of the output voltage. The rise and fall times are typically in the 2-ms to 9-ms range.
enable (EN
overcurrent (OC)
current sense
)
The logic enable disables the power switch, the bias for the charge pump, driver, and other circuitry to reduce
the supply current to less than 10 µA when a logic high is present on EN . A logic zero input on EN restores bias
to the drive and control circuits and turns the power on. The enable input is compatible with both TTL and CMOS
logic levels.
The OC open drain output is asserted (active low) when an overcurrent or overtemperature condition is
encountered. The output will remain asserted until the overcurrent or overtemperature condition is removed.
I(IN)
= 5 V).
A sense FET monitors the current supplied to the load. The sense FET measures current more efficiently than
conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry
sends a control signal to the driver. The driver, in turn, reduces the gate voltage and drives the power FET into
its saturation region, which switches the output into a constant current mode and holds the current constant
while varying the voltage on the load.
thermal sense
An internal thermal-sense circuit shuts off the power switch when the junction temperature rises to
approximately 140°C. Hysteresis is built into the thermal sense circuit. After the device has cooled
approximately 20°C, the switch turns back on. The switch continues to cycle off and on until the fault is removed.
undervoltage lockout
A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2 V , a control
signal turns off the power switch.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
TPS2020, TPS2021, TPS2022, TPS2023, TPS2024
Input voltage
POWER-DISTRIBUTION SWITCHES
SLVS175A – DECEMBER 1998 – REVISED NOVEMBER 1999
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Input voltage range, V
Output voltage range, V
Input voltage range, V
Continuous output current, I
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Turnon Delay and Rise TIme2
Turnoff Delay and Fall Time3
Turnon Delay and Rise TIme with 1-µF Load4
Turnoff Delay and Rise TIme with 1-µF Load5
Device Enabled into Short6
TPS2020, TPS2021, TPS2022, TPS2023, and TPS2024, Ramped Load on Enabled Device
TPS2024, Inrush Current12
7.9-Ω Load Connected to an Enabled TPS2020 Device13
3.7-Ω Load Connected to an Enabled TPS2020 Device14
3.7-Ω Load Connected to an Enabled TPS2021 Device15
2.6-Ω Load Connected to an Enabled TPS2021 Device16
2.6-Ω Load Connected to an Enabled TPS2022 Device17
1.2-Ω Load Connected to an Enabled TPS2022 Device18
1.2-Ω Load Connected to an Enabled TPS2023 Device19
0.9-Ω Load Connected to an Enabled TPS2023 Device20
0.9-Ω Load Connected to an Enabled TPS2024 Device21
0.5-Ω Load Connected to an Enabled TPS2024 Device22
7, 8, 9,
10, 11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
7
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