RT9085AWSC datasheet(4/15 Pages) RICHTEK

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DS9085A-02 March 2019

www.richtek.com

RT9085A

is a registered trademark of Richtek Technology Corporation.

Operation

The RT9085A is using N-MOSFET pass transistor for

output voltage regulation from VIN voltage. The separated

bias voltage (VBIAS) power the low current internal control

circuit for applications requiring low input voltage and ultra

low dropout voltage.

In steady-state operation, the feedback voltage is

regulated to the reference voltage by the internal regulator.

When the feedback voltage signal is less than the

reference, the output current passes through the power

MOSFET will be increased. The extra amount of the

current is sent to the output until the voltage level of ADJ

pin returns to the reference. On the other hand, if the

feedback voltage is higher than the reference, the power

MOSFET current is decreased. The excess charge at the

output can be released by the loading current.

Chip Enable and Shutdown

The RT9085A provides an EN pin, as an external chip

enable control, to enable or disable the device. VEN below

0.54V turns the regulator off and enters the shutdown

mode, while VEN above 0.93V turns the regulator on. When

the regulator is shutdown, the ground current is reduced

to a maximum of 1

μA.

Output Active Discharge

When the RT9085A is operating at shutdown mode, the

device has an internal active pull down circuit that connects

the output to GND through a 150

Ω resistor for output

discharging purpose.

Current Limit

The RT9085A continuously monitors the output current

to protect the pass transistor against abnormal operations.

When an overload or short circuit is encountered, the

current limit circuitry controls the pass transistor's gate

voltage to limit the output within the predefined range.

Over-Temperature Protection (OTP)

The RT9085A has an over-temperature protection. When

the device triggers the OTP, the device shuts down until

the temperature back to normal state.

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