TPS2530

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SLUSB67 – AUGUST 2012

DETAILED DESCRIPTION

TPS2530 is current-limited, power-distribution switch providing 0.5 A continuous load current in 3.3 V or 5 V

circuits. The part use N-channel MOSFETs for low resistance, maintaining voltage to the load. It is designed for

applications where short circuits or heavy capacitive loads are encountered. Device features include enable,

reverse blocking when disabled, overcurrent protection, overtemperature protection, and deglitched fault

reporting.

UVLO

The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn

on threshold. Built-in hysteresis prevents unwanted on/off cycling due to input voltage drop from large current

surges. FLT is high impedance when the TPS2530 is in UVLO.

ENABLE

The logic enable input EN, controls the power switch, bias for the charge pump, driver, and other circuits. The

supply current is reduced to less than 1 µA when the TPS2530 is disabled. Disabling the TPS2530 will

immediately clear an active FLT indication. The enable input is compatible with both TTL and CMOS logic levels.

are internally controlled. The rise time is controlled by both the TPS2530 and the external loading (especially

capacitance). The fall time is controlled by the TPS2530 and the loading (R and C). An output load consisting of

only a resistor will experience a fall time set by the TPS2530. An output load with parallel R and C elements will

The enable should not be left open, and may be tied to VIN or GND depending on the device.

INTERNAL CHARGE PUMP

The device incorporate an internal charge pump and gate drive circuitry necessary to drive the N-channel

MOSFET. The charge pump supplies power to the gate driver circuit and provides the necessary voltage to pull

the gate of the MOSFET above the source. The driver incorporate circuitry that controls the rise and fall times of

the output voltage to limit large current and voltage surges on the input supply, and provides built-in soft-start

functionally. The MOSFET power switch blocks current from OUT to IN when turned off by the UVLO or disabled.

CURRENT LIMIT

Characteristics table. When an overload condition is present, the device maintains a constant output current, with

The first overload condition occurs when either: 1) input voltage is first applied, enable is true, and a short circuit

circuit. The output voltage is held near zero potential with respect to ground and the TPS2530 ramps the output

to thermal cycle.

The second condition is when an overload occurs while the device is enabled and fully turned on. The device

Electrical Characteristics table) is applied. The response speed and shape will vary with the overload level, input

removed or the device begins to thermal cycle.

The TPS2530 thermal cycles if an overload condition is present long enough to activate thermal limiting in any of

temperature up. The device turns off when the junction temperature exceeds 135°C (min) while in current limit.

The device remains off until the junction temperature cools 20°C and then restarts.

Copyright © 2012, Texas Instruments Incorporated

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