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TPS2048 数据表(PDF) 4 Page - Texas Instruments

部件名 TPS2048
功能描述  QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
Download  24 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TPS2048 数据表(HTML) 4 Page - Texas Instruments

  TPS2048 Datasheet HTML 1Page - Texas Instruments TPS2048 Datasheet HTML 2Page - Texas Instruments TPS2048 Datasheet HTML 3Page - Texas Instruments TPS2048 Datasheet HTML 4Page - Texas Instruments TPS2048 Datasheet HTML 5Page - Texas Instruments TPS2048 Datasheet HTML 6Page - Texas Instruments TPS2048 Datasheet HTML 7Page - Texas Instruments TPS2048 Datasheet HTML 8Page - Texas Instruments TPS2048 Datasheet HTML 9Page - Texas Instruments Next Button
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TPS2048, TPS2058
QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS192 – APRIL 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
power switch
The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 m
Ω (VI(INx) = 5 V).
Configured as a high-side switch, the power switch prevents current flow from OUTx to INx and INx 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 20
µA when a logic high is present on ENx (TPS2048) or a logic low is present
on ENx (TPS2058). 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 over temperature condition is
encountered. The output will remain asserted until the overcurrent or over temperature 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 TPS2048 and TPS2058 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.


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