LD1117XX Datasheet, PDF (1/42 Pages) STMicroelectronics – Adjustable and fixed low drop positive voltage regulator

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 (V_ref = 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 (V_REF = 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.
TO-220
DPAK
SOT-223
SO-8
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.
Table 1. Device summary
LD1117XX12
LD1117XX12C
LD1117XX18
LD1117XX18C
LD1117XX25
March 2010
Part numbers
LD1117XX25C
LD1117XX30
LD1117XX33
LD1117XX33C
LD1117XX50
Doc ID 2572 Rev 28
LD1117XX50C
LD1117XX
LD1117XXC
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