TPS2553DBVR IC

Technical Specifications of TPS2553DBVR

Datasheet	TPS2553DBVR datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Power Distribution Switches, Load Drivers
Manufacturer	Texas Instruments
Series	–
Packaging	Cut Tape (CT)
Part Status	Active
Switch Type	General Purpose
Number of Outputs	1
Ratio – Input:Output	1:1
Output Configuration	High Side
Output Type	N-Channel
Interface	On/Off
Voltage – Load	2.5 V ~ 6.5 V
Voltage – Supply (Vcc/Vdd)	Not Required
Current – Output (Max)	1.5A
Rds On (Typ)	85 mOhm
Input Type	Non-Inverting
Features	Slew Rate Controlled, Status Flag
Fault Protection	Current Limiting (Adjustable), Over Temperature, UVLO
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	SOT-23-6
Supplier Device Package	SOT-23-6

Description of the TPS2553DBVR

The TPS2553DBVR power distribution switch is intended for applications demanding precise current limiting, large capacitive loads, and short circuits. It provides up to 1.5 A of continuous load current. With an additional resistor, you can set the most current these devices can handle to be between 75 mA and 1.7 A. The accuracy of the current limit can be as exact as 6% at the highest current-limit levels. The power switch’s rise and fall times are controlled to lessen current surges during turn-on and turn-off.

When the output load surpasses the current-limit threshold, TPS255x devices employ a constant-current mode to limit the output current to a safe level. When there is an overcurrent or reverse voltage, TPS255x-1 devices act as circuit breakers by latching off the power switch.

Features for the TPS2553DBVR

• Maximum Load Current of 1.5 A.
• Typical current-limit accuracy is 6% at 1.7 A.
• meets the requirements for USB current-limiting.
• TPS2550 and TPS2551 are backwards compatible.
• 75 mA to 1700 mA (typical) is the adjustable current limit.
• Latch-Off (TPS255x-1) and Constant-Current (TPS255x) versions.
• 2 s is the typical fast overcurrent response time.
• MOSFET with a high side of 85 m (DBV package).
• Protection against reverse input-output voltage.
• operating between 2.5 and 6.5 volts.
• Integrated Soft Start.

Feature Description

● Overcurrent Conditions

Because of problems with too much current, the TPS255x and TPS255x-1 limit their output current to IOS values. The device keeps the output current steady and lowers the output voltage when it senses it is too high. There are two possible cases where there is too much. The first case is when there is a short or partial short circuit, and the gadget is turned on or enabled. The TPS255x ramps the output current to IOS while keeping the output voltage close to ground potential.

TPS255x devices limit the IOS current until the overload situation is fixed or thermal cycling starts. TPS255x-1 devices will keep the IOS current limit in place until the overload is fixed or the internal de glitch time (usually 7.5 ms) is met. The device will stay turned off until the power is reset or the switch is flipped.

A partial short circuit, momentary overload, or full short circuit happens while the device is active. The device responds to the overcurrent situation (see Figure 21). During this time, the current-sense amplifier is overdriven, temporarily turning off the current-limit MOSFET inside the amplifier. The current-sense amplifier gets the output current back and limits it to IOS.

The TPS255x also limits the current to IOS until the problem with overload is fixed, or the gadget cools down. The TPS255x-1 will only let IOS current through if the overload situation is still there or the device’s built-in de glitch time has passed. The TPS255x will go through thermal cycles if the above overload conditions last long enough to turn on thermal restricting. The device turns off when the joint temperature goes above 135°C (which is normal). The gadget stays off until the junction temperature drops by about 10°C, then turns back on. The TPS255x turns on and off repeatedly until the overload is taken care of.

● Reverse-Voltage Protection

N-channel MOSFETs turn off when the output voltage is 135 mV higher than the input voltage for 4 milliseconds. The negative current is (VOUT – VIN)/rDS(on). As a result, TPS255x/TPS2552-1/TPS2253-1 input devices are protected against being destroyed by the input capacitance absorbing too much current.

When the output voltage falls below the input voltage for the same 4-ms de glitch period, TPS255x devices turn on the N-channel MOSFET. Even after the reverse-voltage state has disappeared, TPS255x-1 devices keep the device off and don’t let the N-channel MOSFET to switch on unless the power is cycled or the device enabled is turned on and off. After 4 ms, the reverse-voltage comparator turns on the active-low FAULT output.

● FAULT Response

The FAULT open-drain output turns on when the current is too high, the temperature is too high, or the voltage is too low. The TPS255x sends out the FAULT signal until the problem is fixed and regular operation can start again. The TPS255x-1 sends the FAULT signal when there is a problem and when it is turned off. The FAULT signal is turned off when the device’s power is turned on and off or when enable is turned on and off, and regular operation continues.

The TPS255x and TPS255x-1 have an internal delay de-glitch circuit that stops false FAULT reporting for overcurrent (normally 7.5 ms) and reverses voltage (usually 4 ms) without any extra hardware. This keeps FAULT from being asserted during regular operation, such as when starting into a large capacitive load. Deglitch slows down the entry and exit of faults. When the temperature is too high, the FAULT warning goes off without deglitching.

● ENABLE (EN or EN)

Several circuits activated by the logic lowers the supply current enabled, including the power switch and the driver. When a logic low is detected on EN, the supply current drops to less than 1 A. The driver, control circuits, and power switch are all activated by either a logic low or logic high input on EN. There is support for both CMOS and TTL logic levels at the enabled input.

● Thermal Sense

Two independent thermal-sensing circuits check the power switch’s working temperature and turn it off if it becomes too hot, making the TPS255x and TPS255x-1 self-protecting. The power switch voltage drops when the TPS255x device operates in constant-current mode due to high current.

When there is too much current, the junction temperature goes up because the power loss in the package is related to the voltage drop across the power switch. The first thermal monitor turns off the power switch when the die temperature exceeds 135°C (minimum) and the part is at its current limit. The thermal monitor has built-in hysteresis, and the switch turns on when the device has cooled down by about 10°C.

Conclusion

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