RT9701 datasheet(9/12 Pages) RICHTEK

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RT9701

DS9701-05 October 2001

www.richtek-ic.com.tw

Functional Description

The RT9701 is a high-side single N-channel switch

with active-high enable input.

Input and Output

VIN (input) is the power supply connection to the

circuitry and the drain of the output MOSFET. VOUT

(output) is the source of the output MOSFET. In a

typical circuit, current flows through the switch from

VIN to VOUT toward the load. Both VOUT pins must

be short on the board and connected to the load and

so do both VIN pins but connected to the power

source.

Thermal Shutdown

Thermal shutdown shuts off the output MOSFET if

the die temperature exceeds 130°C and 20°C of

hysteresis forces the switch turning off until the die

temperature drops to 110°C.

Soft Start

In order to eliminate the upstream voltage droop

caused by the large inrush current during hot-plug

events, the “soft-start” feature effectively isolates

power supplies from such highly capacitive loads.

Under-voltage Lockout

UVLO prevents the MOSFET switch from turning on

until input voltage exceeds 1.8V (typical). If input

voltage drops below 1.8V (typical), UVLO shuts off

the MOSFET switch.

Current Limiting and Short Protection

The current limit circuit is designed to protect the

system supply, the MOSFET switch and the load

from damage caused by excessive currents. The

current limit threshold is set internally to allow a

minimum of 1.1A through the MOSFET but limits the

output current to approximately 1.5A typical. When

the output is short to ground, it will limit to a constant

current 1A until thermal shutdown or short condition

removed.

1 >

2 >

Thermal Shut Down Response

50mS/Div

CH1: VCE : 5V/Div

CH3: IOUT@RL1ohm : 500mA/Div

CH2: IOUT@short : 500mA/Div

VIN = 5V

Thermal Shut Down

CH1

CH2

CH3

1A/Div

Time (50mS/Div)

Ω : 1A/Div

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