HT1117 Datasheet, PDF (1/10 Pages) Holtek Semiconductor Inc – 1A General Purpose LDO

HT1117 Series
1A General Purpose LDO
Features
· Output voltage ranges: Fixed range of 1.8V, 2.5V,
2.85V, 3.3V, 5.0V or adjustable type.
· High accuracy: ±2%
· Low voltage drop: 1.1V (typ.), V_OUT=5.0V at 1A
· Guaranteed output current: 1A
· Low quiescent current: 8mA (typ.)
· Integrated current limit & thermal protection circuits
· SOT-223 package
Applications
· Active SCSI terminations
· Post regulator for switching power supplies
· Low voltage microcontrollers
· Motherboard clock supplies
· Battery chargers
General Description
The HT1117 devices are a series of three-terminal high
current low voltage regulators. They can deliver an out-
put current of 1A and can accept input voltages up to
12V. The devices are available in both adjustable and
fixed output voltage type with a range of 1.8V to 5.0V. In-
ternal current limit and thermal protection circuits pro-
vide protection against overload conditions that could
create excessive junction temperatures.
Selection Table
Part No.
HT1117-ADJ
HT1117-18
HT1117-25
HT1117-28
HT1117-33
HT1117-50
Output Voltage
Adjust
1.8V
2.5V
2.85V
3.3V
5.0V
Package
SOT-223
Note: For lead free devices, a ²#² mark is suffixed at the end of the date code.
Block Diagram
V IN
Marking
HT1117-ADJ
HT1117-18
HT1117-25
HT1117-28
HT1117-33
HT1117-50
C u rre n t
L im itin g
A m p lifie r
T h e rm a l
P r o te c tio n
V OUT
E rro r
A m p.
B andgap
R e fe re n c e
ADJ
Rev. 1.00
GND
1
August 7, 2007