SUPPLY VOLTAGE SUPERVISOR (SVS)

nRST

Hysteresis

min 180ms

Time

USB POWER SWITCHES

TPS65230, TPS65231

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Thermal S/D trip point

160

°C

Thermal S/D hysteresis

20

°C

The supply voltage supervisor monitors two inputs, VMON1 and VMON2, and generates a reset pulse of at least

180-ms length when one or more supplies fall below their respective thresholds. All inputs are deglitched for very

short dips on the supplies. The reference values for VMON1 is specified for monitoring a 3.3-V rail without the

need of external components. The reference for VMON2 is set to monitor arbitrary supply voltages and require

resistor dividers at the inputs.

Please note that the reset signal generated by the SVS is for external use only and has no impact on the power

rails or USB switches of the TPS65230 and TPS65231.

Figure 1. Supply Voltage Supervisor Reset Generation

The TPS65230 and TPS65231 provide two power-distribution switches intended for applications where heavy

capacitive loads and short-circuits are likely to be encountered. Gate drive is provided by an internal regulator.

through EN_USBx bits of the ENABLE register.

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 USBFAULTx 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 switches when a thermal warning condition occurs to prevent

damage. Recovery from a thermal warning is automatic once the device has cooled sufficiently. Internal circuitry

ensures that the switch remains off until valid input voltage is present.

8

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Product Folder Link(s): TPS65230 TPS65231

Not Recommended for New Designs