TPS2046B Datasheet, PDF (1/29 Pages) Texas Instruments – CURRENT-LIMITED, POWER-DISTRIBUTION SWITCHES

www.ti.com
DBV-5 D-8
D-16
TPS2045B, TPS2055B
TPS2046B, TPS2047B
SLVS532C – JULY 2004 – REVISED OCTOBER 2007
CURRENT-LIMITED, POWER-DISTRIBUTION SWITCHES
FEATURES
1
• 70-mΩ High-Side MOSFET
• 250-mA Continuous Current
• Thermal and Short-Circuit Protection
• Accurate Current Limit (0.3 A min, 0.7 A max)
• Operating Range: 2.7 V to 5.5 V
• 0.6-ms Typical Rise Time
• Undervoltage Lockout
• Deglitched Fault Report (OC)
• No OC Glitch During Power Up
• Maximum Standby Supply Current:
1-μA (Single and Dual) or 2-μA (Triple)
• Bidirectional Switch
• Ambient Temperature Range: –40°C to 85°C
• ESD Protection
• UL Pending
APPLICATIONS
• Heavy Capacitive Loads
• Short-Circuit Protections
TPS2045B/TPS2055B
DBV PACKAGE
(TOP VIEW)
OUT
IN
GND
OC
EN ^†
TPS2046B
D PACKAGE
(TOP VIEW)
GND
IN
EN1
EN2
OC1
OUT1
OUT2
OC2
TPS2045B/TPS2055B
D PACKAGE
(TOP VIEW)
GND
IN
IN
EN ^†
OUT
OUT
OUT
OC
TPS2047B
D PACKAGE
(TOP VIEW)
GND
IN1
EN1
EN2
GND
IN2
EN3
NC
OC1
OUT1
OUT2
OC2
OC3
OUT3
NC
NC
NC - No Connection
†_{All enable inputs are active high (EN) for the TPS2055B.}
DESCRIPTION
The TPS204xB/TPS2055B power-distribution switches are intended for applications where heavy capacitive
loads and short circuits are likely to be encountered. These devices incorporate 70-mΩ N-channel MOSFET
power switches for power-distribution systems that require multiple power switches in a single package. Each
switch is controlled by a 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, the device limits 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 that the switch remains
off until valid input voltage is present. This power-distribution switch is designed to set current limit at 0.5 A
typically.
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.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information 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.
Copyright © 2004–2007, Texas Instruments Incorporated