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TPS2045A, TPS2046A TPS2047A, TPS2048A, TPS2055A TPS2056A, TPS2057A, TPS2058A
SLVS251C – SEPTEMBER 2000 – REVISED JANUARY 2008
CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
FEATURES
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• 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 IN IN
EN†
1 2 3 4
8 OUT 7 OUT 6 OUT 5 OC
TPS2046A, TPS2056A D PACKAGE (TOP VIEW)
GND
IN EN1† EN2†
1 2 3 4
8 OC1 7 OUT1 6 OUT2 5 OC2
TPS2047A, TPS2057A D PACKAGE (TOP VIEW)
TPS2048A, TPS2058A D PACKAGE (TOP VIEW)
GNDA IN1
EN1† EN2† GNDB
IN2 EN3†
NC
1 2 3 4 5 6 7 8
16 OC1 15 OUT1 14 OUT2 13 OC2 12 OC3 11 OUT3 10 NC 9 NC
GNDA
IN1 EN1† EN2† GNDB
IN2 EN3† EN4†
1 2 3 4 5 6 7 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
TPS2045A, TPS2046A TPS2047A, TPS2048A, TPS2055A TPS2056A, TPS2057A, TPS2058A
SLVS251C – SEPTEMBER 2000 – REVISED JANUARY 2008
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
AVAILABLE OPTIONS(1)
TA 0°C to 85°C
ENABLE
Active low Active high Active low Active high Active low Active high Active low Active high
RECOMMENDED MAXIMUM CONTINUOUS
LOAD CURRENT (A)
TYPICAL SHORT-CIRCUIT CURRENT LIMIT AT 25°C
(A)
NUMBER OF SWITCHES
Single
Dual 0.25 0.5
Triple
Quad
PACKAGED DEVICES
SOIC (D)(2)
TPS2045AD TPS2055AD TPS2046AD TPS2056AD TPS2047AD TPS2057AD TPS2048AD TPS2058AD
(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) The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2045ADR)
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Copyright © 2000–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS2045A TPS2046A TPS2047A TPS2048A TPS2055A TPS2056A TPS2057A TPS2058A
www.ti.com
TPS2045A
TPS2046A
TPS2045A, TPS2046A TPS2047A, TPS2048A, TPS2055A TPS2056A, TPS2057A, TPS2058A
SLVS251C – SEPTEMBER 2000 – REVISED JANUARY 2008
FUNCTIONAL BLOCK DIAGRAMS
Power Switch
IN
Charge Pump
EN‡
Driver
UVLO
GND † Current sense ‡ Active high for TPS205xA series
Thermal Sense
† CS
Current Limit
OUT OC
GND EN1‡
Charge Pump
UVLO
IN Charge Pump
EN2‡
Thermal Sense
Driver
Current Limit
†
CS
Power Switch
†
CS
Driver
Current Limit
Thermal Sense
OC1
OUT1 OUT2 OC2
† Current sense ‡ Active high for TPS205xA series
Copyright © 2000–2008, Texas Instruments Incorporated
Submi.