www.fairchildsemi.com
FAN1616A
0.5A Adjustable/Fixed Low Dropout Linear Regulator
Features
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 applications where transient response and minimum dropout voltage
are critical. The 5V version is designed also to be used in
USB Hub and Motherboard applications.
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
On-chip thermal limiting provides protection against any
combination of overload and ambient temperature that
would create excessive junction temperatures.
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
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
FAN1616A
VIN = 12V
VIN
+
VOUT
10µF
R1
124Ω
ADJ
9V at 0.5A
+
22µF
R2
768Ω
VOUT = VREF(1 + R2/R1) + IAdj • R2
FAN1616A-3.3
VIN = 9V
+
VIN
VOUT
10µF
3.3V at 0.5A
+
22µF
GND
REV. 1.0.5 3/1/02
FAN1616A
PRODUCT SPECIFICATION
Electrical Characteristics
Operating Conditions: VIN ≤ 12V, TJ = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Conditions
Voltage3
1.5V ≤ (VIN - VOUT) ≤ 5.75V,
10mA ≤ IOUT ≤ 0.5A
Reference
Output Voltage4
Line Regulation1,2
Load
Regulation1,2,3
Dropout Voltage
Min.
Typ.
Max.
Units
•
1.225
(-2%)
1.250
1.275
(+2%)
V
10mA ≤ IOUT ≤ 0.5A
FAN1616A-1.8, 3.3V ≤ VIN ≤ 12V
FAN1616A-2.5, 4.0V ≤ VIN ≤ 12V
FAN1616A-3.3, 4.5V ≤ VIN ≤ 12V
FAN1616A-5, 6.2V ≤ VIN ≤ 12V
•
•
•
•
1.764
2.450
3.234
4.900
1.800
2.500
3.300
5.000
1.836
2.550
3.366
5.100
V
V
V
V
(VOUT + 1.5V) ≤ VIN ≤ 12V, IOUT = 10mA
•
0.005
0.2
%
(VIN – VOUT) = 2V, 10mA ≤ IOUT ≤ 0.5A
•
0.05
0.5
%
∆VREF = 1%, IOUT = 0.5A
•
1.000
1.200
V
Current3
•
35
120
µA
Adjust Pin Current Change3, 4 1.5V ≤ (VIN – VOUT) ≤ 12V,
10mA ≤ IOUT ≤ 0.5A
•
0.2
5
µA
Minimum Load Current
1.5V ≤ (VIN – VOUT) ≤ 12V
•
Quiescent Current
VIN = VOUT + 1.25V
•
Ripple Rejection
f = 120Hz, COUT = 22µF Tantalum,
(VIN – VOUT) = 3V, IOUT = 0.5A
Thermal Regulation
TA = 25°C, 30ms pulse
Adjust Pin
mA
4
60
13
72
0.004
•
Temperature Stability
10
mA
dB
0.02
0.5
%/W
%
Long-Term Stability
TA = 125°C, 1000hrs.
0.03
RMS Output Noise
(% of VOUT)
TA = 25°C, 10Hz ≤ f ≤ 10kHz
0.003
%
Thermal Resistance,
Juncation to Case
SOT-223
15
°C/W
TO-252
3
°C/W
150
°C
Thermal Shutdown
1.0
%
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation. Power dissipation is determined by input/
output differential and the output current. Guaranteed maximum output power will not be available over the full input/output
voltage range.
3. FAN1616A only.
4. Output current must be limited to meet the absolute maximum ratings of the part.
REV. 1.0.5 3/1/02
3
