TPS22941 datasheet(13/19 Pages) TI

13 / 19 page

VIN

GND

VOUT

Off

5.5-V

Battery

10 µF

100 kW

0.1 µF

500 W

TPS22941, TPS22942, TPS22943, TPS22944, TPS22945

www.ti.com

SLVS832C – NOVEMBER 2008 – REVISED NOVEMBER 2009

APPLICATION INFORMATION

Figure 26. Typical Application Circuit, Active-High Enabled Device

(TPS22943, TPS22944 and TPS22945 Only)

On/Off Control

The ON pin controls the state of the switch. Activating ON continuously holds the switch in the on state as long

as there is no fault. An undervoltage on VIN or a junction temperature in excess of 150°C overrides the ON

control to turn off the switch. ON is active high and has a low threshold, making it capable of interfacing with

low-voltage signals.

Undervoltage Lockout

The undervoltage lockout turns off the switch if the input voltage (VIN) drops below the undervoltage lockout

threshold. With the ON pin active, the input voltage rising above the undervoltage lockout threshold causes a

controlled turn-on of the switch, which limits current overshoots.

Thermal Shutdown

Thermal shutdown protects the part from internally or externally generated excessive temperatures. During an

overtemperature condition the switch is turned off. The switch automatically turns on again if the temperature of

the die drops below the threshold temperature.

Reverse Voltage

If the voltage at the VOUT pin is larger than the VIN pin, large currents may flow and can cause permanent

damage to the device. TPS2294x is designed to control current flow only from VIN to VOUT.

Fault Reporting

When an overcurrent, input undervoltage, or overtemperature condition is detected, OC is set active low to signal

the fault mode. OC is an open-drain MOSFET and requires a pullup resistor between VIN and OC. During

shutdown, the pulldown on OC is disabled, reducing current draw from the supply.

Current Limiting

When the switch current reaches the maximum limit, the TPS22921/2/3/4/5 operates in a constant-current mode

to prohibit excessive currents from causing damage. TPS22921/3 has a current limit of 40 mA and TPS22922/4/5

has a current limit of 100 mA. A current limit condition immediately pulls the fault signal pin low (OC pin), and the

part remains in the constant-current mode until the switch current falls below the current limit.

Input Capacitor

To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns-on into a

discharged load capacitor or a short-circuit, a capacitor needs to be placed between VIN and GND. A 1-μF

ceramic capacitor, CIN, placed close to the pins is usually sufficient. Higher values of CIN can be used to further

reduce the voltage drop.

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Product Folder Link(s): TPS22941 TPS22942 TPS22943 TPS22944 TPS22945

TPS22941 Datasheet(PDF) 13 Page - Texas Instruments

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