www.fairchildsemi.com
REV. 1.0.5 3/1/02
Features
• Low dropout voltage
• Load regulation: 0.05% typical
• Current limit
• On-chip thermal limiting
• Standard SOT-223 and TO-252 packages
• Three-terminal adjustable or fixed 1.8V, 2.5V, 3.3V or 5V
• Specified from -40°C to +125°C
Applications
• USB Controlled Power Supply
• High efficiency linear regulators for Mixed Voltage
Logic, ASIC, FPGA based systems
• Post regulators for switching supplies
• Battery chargers
• 12V to 5V, 3.3V, 2.5V, 1.8V, or adj linear regulators
• Motherboard clock supplies
• SDRAM Module supplies
Description
The FAN1616A, FAN1616A-1.8, -2.5, -3.3 and -5 are low
dropout three-terminal regulators with 0.5A output current
capability. These devices have been optimized for applica-
tions where transient response and minimum dropout voltage
are critical. The 5V version is designed also to be used in
USB Hub and Motherboard applications.
On-chip thermal limiting provides protection against any
combination of overload and ambient temperature that
would create excessive junction temperatures.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the bias current of the
FAN1616A flows into the load, increasing efficiency.
The FAN1616A series regulators are available in the
industry-standard SOT-223 and TO-252 power packages.
Typical Applications
V
IN
= 12V V
IN
V
OUT
ADJ
9V at 0.5A
FAN1616A
10µF22µF
R1
124Ω
R2
768Ω
V
IN
= 9V V
IN
V
OUT
GND
3.3V at 0.5A
FAN1616A-3.3
10µF
++
+
+
22µF
V
OUT
= V
REF
(1 + R2/R1) + I
Adj
• R2
FAN1616A
0.5A Adjustable/Fixed Low Dropout Linear Regulator