LDR1825 datasheet(1/13 Pages) STMICROELECTRONICS

No de pièce	LDR1825

Description	VERY LOW DROP DUAL VOLTAGE REGULATOR

PDF	13 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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August 2004

s

OUTPUT CURRENT 1 UP TO 500mA

s

OUTPUT CURRENT 2 UP TO 1.0A

s

LOW DROPOUT VOLTAGE 1

(0.3V @ IO =500mA)

s

LOW DROPOUT VOLTAGE 2

(0.4V @ IO =1A)

s

VERY LOW SUPPLY CURRENT (TYP.50µA

IN OFF MODE, 1.6mA MAX IN ON MODE)

s

LOGIC-CONTROLLED ELECTRONIC

SHUTDOWN

s

OUTPUT VOLTAGE AVAILABILITY FOR

EACH REGULATOR: 1.8V, 2.5V, 3.3V

s

INTERNAL CURRENT AND THERMAL LIMIT

s

STABLE WITH LOW VALUE (MIN 4.7µF)

AND LOW E.S.R. OUTPUT CAPACITORS

s

SUPPLY VOLTAGE REJECTION: 70dB (TYP.)

s

TEMPERATURE RANGE (-40°C TO 125°C)

DESCRIPTION

The LDRxxyy is a Very Low Drop Dual Voltage

Regulator available in PPAK for the version

without inhibit and in SPAK-7L for the version with

the shutdown feature. The very low drop-voltage

(0.5V) and the very low supply current make it

particularly suitable for low noise and low power

applications such as PDA, MICRODRIVE and

other data storage applications while the used

high

voltage

technology

makes

this

device

suitable

for

consumer

applications such

as

MONITORS AND SET-TOP-BOX. For each VO a

Shutdown Logic Control function is available (TTL

compatible)

to

decrease

the

total

power

consumption.

LDRxxyy

VERY LOW DROP

DUAL VOLTAGE REGULATOR

+

-

+

-

START UP 1

BAND GAP 1

DRIVER 1

POWER 1

THERMAL 1

THERMAL 2

START UP 2

BAND GAP 2

DRIVER 2

POWER 2

VO1

VO2

INH2

INH1

VI2

VI1

ERROR

AMPLIFIER 1

ERROR

AMPLIFIER 2

Figure 1: Block Diagram

PPAK

SPAK-7L

Rev. 2

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