Document
TPS2041, TPS2051 POWER-DISTRIBUTION SWITCHES
D 135-mΩ -Maximum (5-V Input) High-Side
MOSFET Switch
D 500 mA Continuous Current D Short-Circuit and Thermal Protection With
Overcurrent Logic Output
D Operating Range . . . 2.7 V to 5.5 V D Logic-Level Enable Input D 2.5-ms Typical Rise Time D Undervoltage Lockout D 10 µA Maximum Standby Supply Current D Bidirectional Switch D Available in 8-pin SOIC and PDIP Packages D Ambient Temperature Range, –40°C to 85°C D 2-kV Human-Body-Model, 200-V
Machine-Model ESD Protection
D UL Listed – File No. E169910
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
TPS2041 D OR P PACKAGE
(TOP VIEW)
GND IN IN EN
1 2 3 4
8 OUT 7 OUT 6 OUT 5 OC
TPS2051 D OR P PACKAGE
(TOP VIEW)
GND IN IN EN
1 2 3 4
8 OUT 7 OUT 6 OUT 5 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
TA
ENABLE
RECOMMENDED MAXIMUM CONTINUOUS
LOAD CURRENT (A)
TYPICAL SHORT-CIRCUIT CURRENT LIMIT AT 25°C
(A)
PACKAGED DEVICES
SOIC (D)†
PDIP (P)
–40°C to 85°C Active low
0.5
0.9 TPS2041D
–40°C to 85°C Active high
0.5
0.9 TPS2051D
† The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2041DR)
TPS2041P TPS2051P
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
•POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1
TPS2041, TPS2051 POWER-DISTRIBUTION SWITCHES
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
TPS2041 functional block diagram
Power Switch
IN
Charge Pump
EN
Driver
† CS
Current Limit
UVLO
GND
Thermal Sense
†Current Sense
NAME
EN EN GND IN OC OUT
TERMINAL
NO.
D OR P
TPS2041 TPS2051
4–
–4
11
2, 3 2, 3
55
6, 7, 8
6, 7, 8
Terminal Functions
I/O DESCRIPTION
I Enable input. Logic low turns on power switch. I Enable input. Logic high turns on power switch. I Ground I Input voltage O Over current. Logic output active low O Power-switch output
OUT OC
•2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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 (VI(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 (TP.