LD1117SC-R datasheet(1/42 Pages) STMICROELECTRONICS

部件名	LD1117SC-R

功能描述	Adjustable and fixed low drop positive voltage regulator

PDF	42 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 42 page

March 2010

Doc ID 2572 Rev 28

1/42

42

LD1117xx

Adjustable and fixed low drop positive voltage regulator

Features

■ Low dropout voltage (1 V typ.)

■ 2.85 V device performances are suitable for

SCSI-2 active termination

■ Output current up to 800 mA

■ Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V,

3.0 V, 3.3 V, 5.0 V

■ Adjustable version availability (Vref = 1.25 V)

■ Internal current and thermal limit

■ Available in ± 1% (at 25 °C) and 2% in full

temperature range

■ Supply voltage rejection: 75 dB (typ.)

Description

The LD1117 is a low drop voltage regulator able

to provide up to 800 mA of output current,

available even in adjustable version (VREF = 1.25

V). Concerning fixed versions, are offered the

following output voltages: 1.2 V, 1.8 V, 2.5 V, 2.85

V, 3.0 V, 3.3 V and 5.0 V. The 2.85 V type is ideal

for SCSI-2 lines active termination. The device is

supplied in: SOT-223, DPAK, SO-8 and TO-220.

The SOT-223 and DPAK surface mount packages

optimize the thermal characteristics even offering

a relevant space saving effect.

High efficiency is assured by NPN pass transistor.

In fact in this case, unlike than PNP one, the

quiescent current flows mostly into the load. Only

a very common 10 µF minimum capacitor is

needed for stability. On chip trimming allows the

regulator to reach a very tight output voltage

tolerance, within ± 1% at 25°C. The adjustable

LD1117 is pin to pin compatible with the other

standard. Adjustable voltage regulators

maintaining the better performances in terms of

drop and tolerance.

DPAK

SO-8

TO-220

SOT-223

Table 1.

Device summary

Part numbers

LD1117XX12

LD1117XX25C

LD1117XX50C

LD1117XX12C

LD1117XX30

LD1117XX

LD1117XX18

LD1117XX33

LD1117XXC

LD1117XX18C

LD1117XX33C

LD1117XX25

LD1117XX50

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