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TPS2041, TPS2051
POWER-DISTRIBUTION SWITCHES
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
D
D
D
D
D
D
D
D
D
D
D
D
D
135-mΩ -Maximum (5-V Input) High-Side
MOSFET Switch
500 mA Continuous Current
Short-Circuit and Thermal Protection With
Overcurrent Logic Output
Operating Range . . . 2.7 V to 5.5 V
Logic-Level Enable Input
2.5-ms Typical Rise Time
Undervoltage Lockout
10
µA
Maximum Standby Supply Current
Bidirectional Switch
Available in 8-pin SOIC and PDIP Packages
Ambient Temperature Range, –40°C to 85°C
2-kV Human-Body-Model, 200-V
Machine-Model ESD Protection
UL Listed – File No. E169910
TPS2041
D OR P PACKAGE
(TOP VIEW)
GND
IN
IN
EN
1
2
3
4
8
7
6
5
OUT
OUT
OUT
OC
TPS2051
D OR P PACKAGE
(TOP VIEW)
GND
IN
IN
EN
1
2
3
4
8
7
6
5
OUT
OUT
OUT
OC
description
The TPS2041 and TPS2051 power distribution switches are intended for applications where heavy capacitive
loads and short circuits are likely to be encountered. The TPS2041 and the TPS2051 are 135-mΩ N-channel
MOSFET high-side power switches. Each switch is controlled by a logic enable compatible with 5-V and 3-V
logic. Gate drive is provided by an internal charge pump that controls 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 TPS2041 and TPS2051 limit
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 in overcurrent 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 TPS2041 and TPS2051 are designed to limit at 0.9-A load. These power distribution switches are available
in 8-pin small-outline integrated circuit (SOIC) and 8-pin plastic dual-in-line packages (PDIP) and operate over
an ambient temperature range of –40°C to 85°C.
AVAILABLE OPTIONS
RECOMMENDED
MAXIMUM CONTINUOUS
LOAD CURRENT
(A)
0.5
0.5
TYPICAL SHORT-CIRCUIT
CURRENT LIMIT AT 25°C
(A)
0.9
0.9
PACKAGED DEVICES
SOIC
(D)†
TPS2041D
TPS2051D
PDIP
(P)
TPS2041P
TPS2051P
TA
–40°C to 85°C
–40°C to 85°C
ENABLE
Active low
Active high
† The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2041DR)
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.
This document contains information on products in more than one phase
of development. The status of each device is indicated on the page(s)
specifying its electrical characteristics.
Copyright
©
1999, Texas Instruments Incorporated
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1
TPS2041, TPS2051
POWER-DISTRIBUTION SWITCHES
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
TPS2041 functional block diagram
Power Switch
†
IN
Charge
Pump
Current
Limit
OC
UVLO
Thermal
Sense
CS
OUT
EN
Driver
GND
†Current Sense
Terminal Functions
TERMINAL
NO.
NAME
EN
EN
GND
IN
OC
OUT
4
–
1
2, 3
5
6, 7, 8
D OR P
TPS2041
TPS2051
–
4
1
2, 3
5
6, 7, 8
I
I
I
I
O
O
Enable input. Logic low turns on power switch.
Enable input. Logic high turns on power switch.
Ground
Input voltage
Over current. Logic output active low
Power-switch output
I/O
DESCRIPTION
2
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TPS2041, TPS2051
POWER-DISTRIBUTION SWITCHES
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
detailed description
power switch
The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 mΩ (V
I(IN)
= 5 V).
Configured as a high-side switch, the power switch prevents current flow from OUT to IN and IN to OUT when
disabled. The power switch supplies a minimum of 500 mA per switch.
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. To 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 4-ms range.
enable (EN or EN)
The logic enable disables the power switch and 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 (TPS2041) or a logic low is present
on EN (TPS2051). A logic zero input on EN or a logic high 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.
overcurrent (OC)
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.
current sense
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.
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3
TPS2041, TPS2051
POWER-DISTRIBUTION SWITCHES
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Input voltage range, V
I(IN)
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6 V
Output voltage range, V
O(OUT)
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V
I(IN)
+ 0.3 V
Input voltage range, V
I(ENx)
or V
I(ENx)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6 V
Continuous output current, I
O(OUT)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . internally limited
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating virtual junction temperature range, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 125°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . 260°C
Electrostatic discharge (ESD) protection: Human body model MIL-STD-883C . . . . . . . . . . . . . . . . . . . . . 2 kV
Machine model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 kV
† 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.
NOTE 1: All voltages are with respect to GND.
DISSIPATION RATING TABLE
PACKAGE
D
P
TA
≤
25°C
POWER RATING
725 mW
1175 mW
DERATING FACTOR
ABOVE TA = 25°C
5.8 mW/°C
9.4 mW/°C
TA = 70°C
POWER RATING
464 mW
752 mW
TA = 85°C
POWER RATING
377 mW
611 mW
recommended operating conditions
TPS2041
MIN
Input voltage, VI(IN)
Input voltage, VI(EN) or VI(EN)
Continuous output current, IO(OUT)
Operating virtual junction temperature, TJ
2.7
0
0
–40
MAX
5.5
5.5
500
125
TPS2051
MIN
2.7
0
0
–40
MAX
5.5
5.5
500
125
UNIT
V
V
mA
°C
4
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