LD1117D12CTR Datasheet

IC型号：
LD1117D12CTR
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STMicroelectronics [LOW DROP FIXED AND ADJUSTABLE POSITIVE ...
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LD1117 series

Low drop fixed and adjustable positive voltage regulators

Feature summary

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Low dropout voltage (1V TYP.)

2.85V Device performances are suitable for

SCSI-2 active termination

Output current up to 800 mA

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

2.85V, 3.0V, 3.3V, 5.0V

Adjustable version availability (V

rel

=1.25V)

Internal current and thermal limit

Available in 卤 1% (at 25掳C) and 2% in full

temperature range

Supply voltage rejection: 75dB (typ.)

SOT-223

SO-8

DPAK

TO-220

Description

The LD1117 is a LOW DROP Voltage Regulator

able to provide up to 800mA of Output Current,

available even in adjustable version (Vref=1.25V).

Concerning fixed versions, are offered the

following Output Voltages: 1.2V,1.8V,2.5V,2.85V,

3.0V 3.3V and 5.0V. The 2.85V 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碌F minimum capacitor is needed for stability.

On chip trimming allows the regulator to reach a

very tight output voltage tolerance, within 卤 1% at

25掳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.

Block diagram

December 2006

Rev. 20

1/38

www.st.com

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