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Details, datasheet, quote on part number:TPS2056P
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| Part: | TPS2056P |
| Category: | Power Management => Power Distribution/Switches => USB Power Controllers/Switches => USB Power Switches |
| Description: | ti TPS2056, 0.345A, 2.7-5.5V Dual (1In/2Out) Hi-side MOSFET, Fault Report, Act-high Enable |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download TPS2056P datasheet File size : 421 kB |
| Request For quote: | Find where to buy TPS2056P
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Datasheet text preview:
TPS2046, TPS2056 DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS183 APRIL 1999
features
typical applications
D D D D D D D D D D D D
135-m -Maximum (5-V Input) High-Side MOSFET Switch 250 mA Continuous Current per Channel Independent 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
D D D D
Notebook, Desktop and Palmtop PCs Monitors, Keyboards, Scanners, and Printers Digital Cameras, Phones, and PBXs Hot-Insertion Applications
TPS2046 D OR P PACKAGE (TOP VIEW)
TPS2056 D OR P PACKAGE (TOP VIEW)
GND IN EN1 EN2
1 2 3 4
8 7 6 5
OC1 OUT1 OUT2 OC2
GND IN EN1 EN2
1 2 3 4
8 7 6 5
OC1 OUT1 OUT2 OC2
description
The TPS2046 and TPS2056 dual power-distribution switches are intended for applications where heavy capacitive loads and short circuits are likely. These devices incorporate in single packages two 135-m N-channel MOSFET high-side power switches for power-distribution systems that require multiple 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 TPS2046 and TPS2056 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 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 TPS2046 and TPS2056 are designed to limit at 0.44-A load. These power distribution switches, available in 8-pin small-outline integrated circuit (SOIC) and 8-pin plastic dual-in-line packages (PDIP), operate over an ambient temperature range of 40°C to 85°C.
AVAILABLE OPTIONS RECOMMENDED MAXIMUM CONTINUOUS CONTINUOUS LOAD CURRENT (A) 0.25 TYPICAL SHORT-CIRCUIT CURRENT CURRENT LIMIT AT 25°C (A) 0.44 PACKAGED DEVICES SOIC (D) TPS2046D PDIP (P) TPS2046P TPS2056P
TA 40°C to 85°C
ENABLE
Active low
40°C to 85°C Active high 0.25 0.44 TPS2056D The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2046DR)
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 Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 1999, Texas Instruments Incorporated
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· DALLAS, TEXAS 75265
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TPS2046, TPS2056 DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS183 APRIL 1999
TPS2046 functional block diagram
OC1 GND EN1 Driver Charge Pump CS UVLO Power Switch IN Charge Pump Driver Current sense EN2 Thermal Sense Current Limit OC2 CS OUT2 OUT1 Current Limit Thermal Sense
Terminal Functions
TERMINAL NO. NAME EN1 EN2 EN1 EN2 GND IN OC1 OC2 OUT1 OUT2 3 4 1 2 8 5 7 6 D OR P TPS2046 TPS2056 3 4 1 2 8 5 7 6 I I I I I I O O O O Enable input. Logic low turns on power switch, IN-OUT1. Enable input. Logic low turns on power switch, IN-OUT2. Enable input. Logic high turns on power switch, IN-OUT1. Enable input. Logic high turns on power switch, IN-OUT2. Ground Input voltage Overcurrent. Logic output active low, for power switch, IN-OUT1 Overcurrent. Logic output active low, for power switch, IN-OUT2 Power-switch output Power-switch output I/O DESCRIPTION
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPS2046, TPS2056 DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS183 APRIL 1999
detailed description
power switch The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 m (VI(IN) = 5 V). Configured as a high-side switch, the power switch prevents current flow from OUTx to IN and IN to OUTx when disabled. The power switch can supply a minimum of 250 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 (ENx or ENx) 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 ENx (TPS2046) or a logic low is present on ENx (TPS2056). A logic zero input on ENx or logic high on ENx 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 (OCx) The OCx 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 The TPS2046 and TPS2056 implement a dual-threshold thermal trip to allow fully independent operation of the power distribution switches. In an overcurrent or short-circuit condition the junction temperature rises. When the die temperature rises to approximately 140°C, the internal thermal sense circuitry checks to determine which power switch is in an overcurrent condition and turns off that switch, thus isolating the fault without interrupting operation of the adjacent power switches. Hysteresis is built into the thermal sense, and after the device has cooled approximately 20 degrees, the switch turns back on. The switch continues to cycle off and on until the fault is removed. The (OCx) open-drain output is asserted (active low) when overtemperature or overcurrent occurs. 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.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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