Datasheet > UP7718A

UP7718A

更新时间： 2024-01-25 21:45:30

品牌	Logo	应用领域
合力精密电子 - UNITPOWER		稳压器
页数	文件大小	规格书
11页	274K
描述
3A Ultra Low Dropout Linear Regulator

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UP7718A 数据手册

Preliminary

uP7718

Functional Pin Description

Pin No. Name Pin Function

Ground.

GND

Feedback Voltage. This pin is the inverting input to the error amplifier. A resistor divider from

the output to GND is used to set the regulation voltage as V_OUT= 0.8x(R1+R2)/R1 (V)

Output Voltage. This pin is power output of the device. A pull low resistance exists when the

device is disabled by pulling low the EN pin. To maintain adequate transient response to large

load change, typical value of 1000uF Al electrolytic capacitor with 10uF ceramic capacitors are

recommended to reduce the effects of current transients on VOUT.

3, 4

VOUT

VIN

Input Voltage. This is the drain input to the power device that supplies current to the output pin.

Large bulk capacitors with low ESR should be placed physically close to this pin o prevent the

input rail from dropping during large load transient. A 4.7uF ceramic capacitor is recommended

at this pin. V_INcannot be forced higher than V_CNTLotherwise the current limit function may be false

triggered and disable the output voltage.

Supply Input for Control Circuit. This pin provides bias voltage to the control circuitry and

driver for the pass transistor.The driving capability of output current is proportioned to the V_CNTL

For the device to regulate, the voltage on this pin must be at least 1.5V greater than the output

voltage, and no less than V_{CNTL_MIN.}

CNTL

Power OK Indication. This pin is an open-drain output and is set high impedance once V_OUT

reaches 90% of its rating voltage.

POK

Enable Input. Pulling this pin below 0.5V turns the regulator off, reducing the quiescent current

to a fraction of its operating value.

Exposed Pad

Connected to VIN plane for better heat dissipation.

Functional Block Diagram

CNTL

VIN

Power On

Reset

Thermal Limit

Softstart &

Control Logic

Current Limit

0.8V

VOUT

Delay

POK

90% V_REF

GND

uPI Semiconductor Corp., http://www.upi-semi.com

Rev. P00, File Name: uP7718-DS-P0000

123 4 5 6 7...11

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