RT9183 Ver la hoja de datos (PDF) - Richtek Technology

Número de pieza

componentes Descripción

Fabricante

RT9183

Ultra Low Dropout 1.5A Linear Regulator

Richtek Technology 

RT9183

Adjustable Operation

The adjustable version of the RT9183 has an output voltage

range of 0.8V to 4.5V. The output voltage is set by the

ratio of two external resistors as shown in Figure 2. The

value of R2 should be less than 80k to maintain regulation.

In critical applications, small voltage drop is caused by

the resistance (RT) of PC traces between the ground pin of

the device and the return pin of R2 (See Figure 5 shown on

next page). Note that the voltage drop across the external

PC trace will add to the output voltage of the device.

Optimum regulation will be obtained at the point where

the return pin of R2 is connected to the ground pin of the

device directly.

VIN

Enable

C

0.1uF

(SOP-8 & TO-263-5)

RT9183

VIN

VOUT

EN

CIN

10uF

GND ADJ

RT

VOUT

R1

COUT

10uF

R2

Figure 5. Return Pin of External Resistor Connection

Referring to Figure 3 the fixed voltage versions for both

SOP-8 and TO-263-5 packages, the ADJ pin is the input

to the error amplifier and MUST be tied the ground pin of

the device directly otherwise it will be in the unstable state

if the pin voltage more than 0.1V with respect to the ground

pin itself.

www.richtek.com

12

DS9183-14 April 2008

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