TPS2047A_14 Datasheet, PDF (1/38 Pages) Texas Instruments – CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

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TPS2045A, TPS2046A
TPS2047A, TPS2048A, TPS2055A
TPS2056A, TPS2057A, TPS2058A
SLVS251C – SEPTEMBER 2000 – REVISED JANUARY 2008
CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
FEATURES
1
• 80-mΩ High-Side MOSFET Switch
• 250 mA Continuous Current Per Channel
• Independent Thermal and Short-Circuit
Protection With Overcurrent Logic Output
• Operating Range: 2.7-V to 5.5-V
• CMOS- and TTL-Compatible Enable Inputs
• 2.5-ms Typical Rise Time
• Undervoltage Lockout
• 10 µA Maximum Standby Supply Current
for Single and Dual
(20 µA for Triple and Quad)
• Bidirectional Switch
• Ambient Temperature Range, 0°C to 85°C
• ESD Protection
DESCRIPTION
The TPS2045A through TPS2048A and TPS2055A
through TPS2058A power-distribution switches are
intended for applications where heavy capacitive
loads and short circuits are likely to be encountered.
TPS2045A, TPS2055A
D PACKAGE
(TOP VIEW)
GND 1
IN 2
IN 3
EN^† 4
8 OUT
7 OUT
6 OUT
5 OC
TPS2046A, TPS2056A
D PACKAGE
(TOP VIEW)
GND 1
IN 2
EN1^† 3
EN2^† 4
8 OC1
7 OUT1
6 OUT2
5 OC2
TPS2047A, TPS2057A
D PACKAGE
(TOP VIEW)
TPS2048A, TPS2058A
D PACKAGE
(TOP VIEW)
GNDA 1
IN1 2
EN1^† 3
EN2^† 4
GNDB 5
IN2 6
EN3^† 7
NC 8
16 OC1 GNDA 1
15 OUT1
IN1 2
14 OUT2 EN1^† 3
13 OC2
EN2^† 4
12 OC3 GNDB 5
11 OUT3
IN2 6
10 NC
EN3^† 7
9 NC
EN4^† 8
16 OC1
15 OUT1
14 OUT2
13 OC2
12 OC3
11 OUT3
10 OUT4
9 OC4
† _{All enable inputs are active high for the TPS205xA series.}
NC – No connect
These devices incorporate 80-mΩ N-channel MOSFET high-side power switches for power-distribution systems
that require multiple power switches in a single package. Each switch is controlled by an independent logic
enable input. 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, these devices limit the output
current to a safe level by switching into a constant-current mode, pulling the overcurrent (OCx) 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. These power-distribution switches are designed to current limit at
0.5 A.
1
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 © 2000–2008, Texas Instruments Incorporated