CS8271 데이터 시트보기 (PDF) - Cherry semiconductor

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CS8271

Adjustable Micropower Low Dropout Linear Regulator with ENABLE

Cherry semiconductor 

Electrical Characteristics: VOUT + 1V ² VIN ² 30V, 5V ² VOUT ² 12V, IOUT = 10mA, -40¡ ² TA ² 125¡, -40¡ ² TJ ² 150¡,

VENABLE = 0V; unless otherwise specified.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

s ENABLE

Enable Threshold

1.15

2.0

2.6

V

Enable Input Current

VENABLE = 2.6V

VENABLE = 5V

10

20

µA

35

50

µA

s Adjustment Pin

Reference Voltage

Adjustment Pin Current

R1: Feedback resistor between VOUT and Adjust, R2: Adjust resistor to ground.

100µA ² IOU T² 100mA

IAdj =

VREF

R2

-

(VOUT - VREF)

R1

1.246

1.272

1.297

V

20

500

nA

Note 1: Guaranteed by design, not 100% tested in production.

PACKAGE PIN #

8L SOIC & PDIP

1

2

3, 6, 7

4

5

8

Package Pin Description

PIN SYMBOL

FUNCTION

VOUT

Gnd

NC

Adj

ENABLE

VIN

100mA output; adjustable from 5V to 12V.

Ground.

No Connection.

Resistor divider from VOUT to Adj, sets output voltage.

Logic level switch, when HIGH, regulator is in sleep mode.

Input voltage.

Circuit Description

Output Voltage Adjustment

The output voltage of the CS8271 is adjustable to any value

between the reference voltage on the Adj pin, (1.272V Typ.)

and the maximum input voltage minus the dropout voltage.

To adjust the output voltage, a pair of external resistors R1

and R2 are connected as shown in Figure 1.

The equation for the output voltage is

VOUT

CS8271

Adj

( ) VOUT = VREF x

R1 + R2

R2

+ IAdj x R1

where Vref is the typical reference voltage and IAdj is the

adjust pin bias current. This is usually 500nA maximum.

Figure 1: Output Voltage Adjustment.

VOUT

R1

VREF

R2

3

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