GS7103PP-R datasheet(10/15 Pages) GSTEK

10 / 15 page

3A Ultra Low Dropout Linear Regulator

GS7103

Green Solution Technology Co.,LTD.

Rev.:1.6

JUN-16

Application Information

Enable

The GS7103 has a dedicated enable pin(EN).

When the EN pin is in the logic low (VEN<0.6V),

the regulator will be turned off, reducing the

supply current to less than 1uA.

When the EN pin is in the logic high (VEN>1.4V),

the regulator will be turned on and undergoes a

new soft-start cycle. Left open, the EN pin is

pulled down by a internal resistor to shut down

the regulator.

Power-on-Reset

The GS7103 features a power-on-reset control

through monitor both input voltages to prevent

wrong operations. Only after the two supply

voltages exceed their rising POR threshold

voltages, the regulator is to be initiated and starts

up.

POK

The POK pin is an open-drain output, and can be

connects to VOUT or other rail through an external

pull-up resistor. As the output voltage arrives 92%

of normal output voltage, an internal delay

function starts to perform a delay time and then

output the POK pin high to indicate the output is

OK. As the output voltage falls below the falling

Power-OK threshold or one of the two supply

voltages falls below it’s falling POR threshold, the

POK pin will output low immediately without a

delay time.

Build-In Soft-Start

An internal soft-start function controls rise rate of

the output voltage to limit the current surge at

start-up. The typical soft-start interval is about

3mS.

Current Limit

The GS7103 contains a foldback over current

protection function. It allows the output current to

reach the maximum value of 4A. Then further

decreases in the load resistance reduce both the

load current and the load voltage. The main

advantage of foldback limiting is less power

dissipation in the pass transistor under shorted-

load conditions. During startup, the current limit

value is set to a high value, thus GS7103 can

operate in full load condition. After startup, the

current limit value is set to a normal value, so the

pass transistor can be protected well.

Thermal-Shutdown Protection

Thermal Shutdown protects GS7103 from ex-

cessive power dissipation. If the die temperature

exceeds 150°C, the pass transistor is shut off.

50°C of hysteresis prevents the regulator from

turning on until the die temperature drops to

100°C.

Output Capacitor selection

The GS7103 is designed to employ ceramic

output capacitors as low as 10uF; if employ EL

output capacitor as large as 1000uF, feedback

resistance(Rbottom) should be larger than 100K

ohm(Table 2). Place the capacitors physically as

close as possible to the device with wide and

direct PCB traces. Capacitor ESR should be less

than 50mohm.

Cout

Rbottom

Ceramic

≥

10uF

≥

0.1KΩ

1000uF

≥

100KΩ

Table 1 Cout capacitor vs. Rbottom resistance

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