LD1117A Datasheet, PDF (1/27 Pages) STMicroelectronics – LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS

LD1117A series
Low drop fixed and adjustable positive voltage regulators
Features
■ Low dropout voltage
(1.15V typ. @ I_OUT = 1A, 25°C)
■ Very low quiescent current
(5 mA typ. @ 25°C)
■ Output current up to 1A
■ Fixed output voltage of: 1.2V, 1.8V, 2.5V,
2.85V, 3.3V, 5.0V
■ Adjustable version availability (V_rel = 1.25V)
■ Internal current and thermal limit
■ Only 10 µF for stability
■ Available in ± 2% (at 25°C) and 4% in full
temperature range
■ High supply voltage rejection:
– 80dB typ. at 25°C)
■ Temperature range: 0°C to 125°C
Description
The LD1117A is a LOW DROP Voltage Regulator
able to provide up to 1A of Output Current,
available even in adjustable version (Vref=1.25V).
Block diagram
TO-220
SOT-223
DPAK
D²PAK/A
Concerning fixed versions, are offered the
following Output Voltages: 1.2V, 1.8V, 2.5V, 2.85V,
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, D²PAK/A and TO-220. Surface
mount packages optimize the thermal
characteristics even offering a relevant space
saving effect. High efficiency is assured by NPN
pass transistor. Only a very common 10µF
minimum capacitor is needed for stability. Only
chip trimming allows the regulator to reach a very
tight output voltage tolerance, within ± 2% at
25°C.
January 2007
Rev. 17
1/27
www.st.com
27