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LD1117D12CTR Datasheet

  • LD1117D12CTR

  • STMicroelectronics [LOW DROP FIXED AND ADJUSTABLE POSITIVE ...

  • 473.31KB

  • STMICROELECTRONICS   STMICROELECTRONICS

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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 鹵 1% (at 25擄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 鹵 1% at
25擄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
38

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