Diodes AP1086 User Manual
AP1086
1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Description
AP1086 is a low dropout positive adjustable or fixed-mode
regulator with 1.5A output current capability. The product is
Pin Assignments
(Top View)
3
specifically designed to provide well-regulated su pply for low
voltage IC applications such as high-speed bus termination
2
and low current 3.3V logic supply. AP1086 is also well suited
for other applications such as VGA cards. AP1086 is
guaranteed to have lower than 1.4V dropout at full load
current making it ideal to provide well-regulated outputs of
1.25V to 5.0V with 4.7 to 12V input supply by different output
voltage.
Features
• 3-Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V,3.3V,
5.0V
• 1.4V Maximum Dropout at Full Load Current
• Fast Transient Response
• Built-in Thermal Shutdown
• Output Current Limiting
• Lead Free Packages: TO252-3L, TO263-3L, TO220-3L
• TO252-3L, TO263-3L, and TO220-3L: Available in
“Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
1
Tab is V
OUT
TO252-3L
(Top View)
3
2
1
Tab is V
OUT
TO263-3L
(Top View)
3
2
1
Tab is V
OUT
TO220-3L
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
V
V
OUT
V
OUT
Adj (GND)
IN
Adj (GND)
V
IN
V
IN
V
OUT
Adj (GND)
Typical Application Circuit
5V to 3.3V Fixed Mode Regulator
5V
C1
100uF
Vin
Vout
GND
Tab is Vout
AP1086
Document number: DS31028 Rev. 6 - 2
C2
100uF
3.3V/1.5A
1 of 10
www.diodes.com
Tab is Vout
Adjustable Regulator
5V
Vout
Note:
Vin
Adj
o
C1
100uF
RE
F
V
OUT=Vref
R1
121
R2
121
(
VV +∗=
1
Ω
Ω
R
2
)
R
1
×
(1+R2/R1)
2.5V/1.5A
C2
100uF
June 2010
© Diodes Incorporated
1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR
Pin Descriptions
Pin Name I/O Pin # Description
Adj (GND) 1 Adjustable (Ground only for fixed mode)
V
O 2
OUT
VIN I 3
Functional Block Diagram
The output of the regulator. A minimum of 10uF capacitor must be connected
from this pin to ground to insure stability.
The input pin of regulator. Typically a large storage capacitor is connected
from this pin to ground to insure that the input voltage does not sag below the
minimum dropout voltage during the load transient response. This pin must
always be 1.4V higher than V
in order for the device to regulate properly.
OUT
AP1086
FIXED-MODE REGULATOR
3
V
IN
2
+
+
-
1.25V
+
CURRENT
LIMIT
+
Thermal
Shutdown
-
1
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VIN DC Supply Voltage -0.3 to 12 V
TST Storage Temperature -65 to +150
TMJ Maximum Junction Temperature 150
V
Adj
o
o
OUT
C
C
Recommended Operating Conditions
Symbol Parameter Min Max Unit
Top Operating Junction Temperature Range
0 125
AP1086
Document number: DS31028 Rev. 6 - 2
2 of 10
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© Diodes Incorporated
o
C
June 2010
AP1086
1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics (Under Operating Conditions)
Parameter Conditions
Reference Voltage AP1086-Adj
AP1086-1.5
AP1086-1.8
Output Voltage
AP1086-2.5
AP1086-3.3
AP1086-5.0
Line Regulation AP1086-XXX IO = 10mA, V
AP1086-Adj
AP1086-1.5
AP1086-1.8
Load Regulation
AP1086-2.5
AP1086-3.3
AP1086-5.0
Dropout Voltage
IN-VOUT
)
(V
Current Limit
Minimum Load
Current (Note 4)
Thermal Regulation
Ripple Rejection
RMS Noise (% of V
AP1086-Adj/-2.5/
-3.3/-3.6/-5.0
AP1086-Adj/-2.5/
-3.3/-3.6/-5.0
AP1086-XXX
T
= 25οC, 30ms pulse
A
f = 120Hz,C
OUT
AP1086-XXX V
OUT
)
10Hz ≤ f ≤ 10KHz
T
= 25οC, (VIN-V
A
I
= 10mA, TA = 25οC, 3V≦VIN≦12V
OUT
= 10mA, TA = 25οC, 3.3V≦VIN≦12V
I
OUT
= 10mA, TA = 25οC, 4V≦VIN≦12V
I
OUT
I
= 10mA, TA = 25οC, 4.8V≦VIN≦12V
OUT
I
= 10mA, TA = 25οC, 6.5V≦VIN≦12V
OUT
V
= 3.3V, 0mA<Io<1.5A, TA = 25οC
IN
(Note 2, 3)
V
= 3V, 0mA<Io<1.5A, TA = 25οC
IN
(Note 2, 3)
V
= 3.3V, 0mA<Io<1.5A, TA = 25οC
IN
(Note 2, 3)
V
= 4V, 0mA<Io<1.5A, TA = 25οC
IN
(Note 2, 3)
V
= 5V, 0≦I
IN
T
= 25oC (Note 2, 3)
J
= 8V, 0≦I
V
IN
T
= 25oC (Note 2, 3)
J
I
= 1.5A, ΔV
OUT
(VIN-V
o
0
) = 5V 1. 6 - - A
OUT
C≦TJ≦125oC
= 25uF Tantalum, I
= V
IN
OUT
)= 1.5V,IO = 10mA
OUT
+1.5V<VIN<12V - - 0.2 %
OUT
≦1.5A, TA = 25οC,
OUT
≦1.5A, TA = 25οC,
OUT
= 1%V
OUT
= 1.5A
OUT
OUT
+3V - 60 70 dB
Temperature Stability IO = 10mA - 0.5 - %
θ
Thermal Resistance
JA
Junction-to-Ambient
(No heat sink; No air flow)
θ
Thermal Resistance
JC
Junction-to-Case
Notes: 2. See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant
junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package.
3. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference in input and
output and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
4. Quiescent current is defined as the minimum output current required in maintaining regulation. At 12V input/output differential the device is
guaranteed to regulate if the output current is greater than 10mA.
TO252-3L
TO263-3L
TO220-3L
TO252-3L: Control Circuitry/Power Transistor
TO263-3L: Control Circuitry/Power Transistor
TO220-3L: Control Circuitry/Power Transistor
Min Typ. Max Unit
1.225 1.250 1.275
1.470 1.500 1.530 V
1.764 1.800 1.836 V
2.450 2.500 2.550 V
3.235 3.300 3.365 V
4.900 5.000 5.100 V
- - 1 %
- 12 15 mV
- 15 18 mV
- 20 25 mV
- 26 33 mV
- 40 50 mV
- 1.3 1.4 V
- 5 10 mA
- 0.008 0.04 %/W
- 0.003 - %
-
-
101
83
86
15
0.65/2.7
0.65/2.7
o
C/W
-
o
C/W
-
AP1086
Document number: DS31028 Rev. 6 - 2
3 of 10
www.diodes.com
June 2010
© Diodes Incorporated
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