1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 May. 14, 2004
1/9
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.
General Description
AP1086 is a low dropout positive adjustable or
fixed-mode regulator with minimum of 1.5A output
current capability. The product is specifically
designed to provide well-regulated supply for low
voltage IC applications such as high-speed bus
termination and low current 3.3V logic supply.
AP1086 is also well suited for other applications
such as VGA cards. AP1086 is guaranteed to have
<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.
Ordering Information
AP1086
X
X
X
X
Low Dropout Regulator Package Vout
D : TO252-3L
K : TO263-3L
T : TO220-3L
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Packing
Blank : Tube
A : Taping
Lead Free
Blank : Normal
L : Lead Free Package
Typical Application
5V to 3.3V Fixed Mode Regulator Adjustable Regulator
C2
100uF
5V
3.3V/1.5A
Tab is Vout
Vin
Vout
GND
C1
100uF
R1
121
R2
121
C2
100uF
5V
2.5V/1.5A
Tab is Vout
Vin
Vout
C1
100uF
Adj
V
OUT
=V
ref
(1+R2/R1)
Ω
Ω
×
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
2/9
Block Diagram
3
THERMAL
SHUTDOWN 1
2 Vout
Adj
(GND)
1.25V +
+
CURRENT
LIMIT
Vin
－
+
－
+
Functional Description
Introduction
The AP1086 adjustable or fixed-mode Low
Dropout(LDO) regulator is a 3 terminal device
which can easily be programmed by internal mask
change to any voltages within the range of 1.25 to
5V. The AP1086 only needs 1.4V differential
between Vin and Vout to maintain output regulation.
In addition, the output voltage tolerances are also
extremely tight and they include the transient
response as part of the specification. For example,
Intel VRE specification calls for a total of +/- 100mV
including initial tolerance, load regulation and 0 to
1.5A load step.
The AP1086 is specifically designed to meet the
fast current transient needs as well as providing an
accurate initial voltage, reducing the overall system
cost with the need for fewer output capacitors.
Load Regulation
Since the AP1086 is only a 3 terminal device, it is
not possible to provide true remote sensing of the
output voltage at the load. But it can supply good
load regulation by internal feedback bypass the
external loss such as adjustable mode.
Stability
The AP1086 requires the use of an output capacitor
as part of the frequency compensation in order to
make the regulator stable. For most applications a
minimum of 10uF aluminum electrolytic capacitor
insures both stability and good transient response.
Thermal Design
The AP1086 incorporates an internal thermal
shutdown that protects the device when the junction
temperature exceeds the maximum allowable
junction temperature. Although this device can
operate with junction temperatures in the range of
150oC, it is recommended that the selected heat
sink be chosen such that during maximum
continuous load operation the junction temperature
is kept below the temperature.
Layout Consideration
The output capacitors must be located as close to
the Vout terminal of the device as possible. It is
recommended to use a section of a layer of the PC
board as a plane to connect the Vout pin to the
output capacitors to prevent any high frequency
oscillation that may result due to excessive trace
inductance.
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
3/9
Connection Diagram
3 PIN TO263 3 PIN TO252 3 PIN TO220
3
2
1
Vin
Vout
Tab is Vout
FRONT VIEW
Adj
(GND)
3
2
1
Vin
Vout
Adj
(GND)
Tab is Vout
FRONT VIEW
Tab is Vout
3Vin
2
1
Vout
FRONT VIEW
Adj
(GND)
Pin Descriptions
NAME I/O PIN # FUNCTION
Adj
(GND) 1 Adjustable (Ground only for fixed mode)
Vout O 2
The output of the regulator. A minimum of 10uF capacitor must be
connected from this pin to ground to insure stability.
Vin I 3
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 Vout in order for
the device to regulate properly.
Absolute Maximum Ratings
Symbol Parameter Rating Unit
Vin DC Supply Voltage -0.3 to 12 V
PD Power Dissipation Internally Limited
TST Storage Temperature -65 to +150 oC
TOP Operating Junction Temperature Range 0 to +150 oC
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
4/9
Electrical Characteristics (Under Operating Conditions)
PARAMETER CONDITIONS MIN TYP MAX UNIT
Reference Voltage AP1086-Adj TJ=25oC,(VIN-VOUT)=1.5V,IO=10mA 1.225 1.250 1.275 V
AP1086-1.5
IOUT = 10mA, TJ = 25oC, 3V≦VIN≦12V 1.470 1.500 1.530 V
Output Voltage AP1086-1.8 IOUT = 10mA, TJ = 25oC, 3.3V≦VIN≦
12V 1.764 1.800 1.836 V
AP1086-2.5 IOUT = 10mA, TJ = 25oC, 4V≦VIN≦12V 2.450 2.500 2.550 V
AP1086-3.3 IOUT = 10mA, TJ = 25oC, 4.8V≦VIN≦
12V 3.235 3.300 3.365 V
AP1086-5.0 IOUT = 10mA, TJ = 25oC, 6.5V≦VIN≦
12V 4.900 5.000 5.100 V
Line Regulation AP1086-XXX IO=10mA, VOUT+1.5V<VIN<12V - - 0.2 %
AP1086-Adj VIN=3.3V, 0mA<Io<1.5A, TJ=25oC
(Note 1, 2) - - 1 %
AP1086-1.5 VIN=3V, 0mA<Io<1.5A, TJ=25oC
(Note 1, 2) - 12 15 mV
AP1086-1.8 VIN=3.3V, 0mA<Io<1.5A, TJ=25oC
(Note 1, 2) - 15 18 mV
AP1086-2.5 VIN=4V, 0mA<Io<1.5A, TJ=25oC
(Note 1, 2) - 20 25 mV
AP1086-3.3 VIN = 5V, 0≦IOUT≦1.5A, TJ=25oC ,
TJ=25oC (Note 1.2) - 26 33 mV
Load Regulation
AP1086-5.0 VIN = 8V, 0≦IOUT≦1.5A, TJ=25oC ,
TJ=25oC (Note 1.2) - 40 50 mV
Dropout Voltage
(VIN-VOUT)
AP1086-Adj/-2.5
/-3.3/-3.6/-5.0 IOUT = 1.5A, ∆VOUT=1%VOUT - 1.3 1.4 V
Current Limit AP1086-Adj/-2.5
/-3.3/-3.6/-5.0 (VIN-VOUT) = 5V 1. 6 - - A
Minimum Load Current AP1086-XXX 0oC≦Tj≦125oC - 5 10 mA
Thermal Regulation TA=25℃, 30ms pulse - 0.008 0.04 %/W
F=120Hz,COUT=25uF Tantalum, IOUT=1.5A
Ripple Rejection
AP1086-XXX VIN=VOUT+3V - 60 70 dB
Temperature Stability IO=10mA - 0.5 - %
Thermal Resistance
Junction-to-Ambient
TO-252
TO-263 - 101
91 - OC/W
Thermal Resistance
Junction-to-Case
TO-252: Control Circuitry/Power Transistor
TO-263: Control Circuitry/Power Transistor - 15
10 - OC/W
Note 1: 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.
Note 2: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.
Note 3: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.
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
5/9
Typical Performance Characteristics
Temperature (
o
C)
Percent Change in Output Voltage vs Temperature
Output Voltage Change (%)
-50 -25 0 25 50 75 100 125 150
- 2
-1.5
- 1
-0.5
0
0. 5
1
1.5
2
Input Voltage (V)
Line Regulation
Output Voltage Deviation (%)
0
0.2
0.4
0.6
0.8
1
24
6 8 10 12
TIME (us)
Line Transient Response
Output Voltage Deviation (mV) Input Voltage (V)
-40
-20
0
20
40
5.5
6.5
7.5 Cin=1uF
Cout=10uF Tantalum
0 20 40 60 80 100 120 140 160 180 200
TIME (us)
Load Transient Response
Load Current (A) Output Voltage Deviation (mV)
010
20 30 40 50 60 70 80 90 100
-1
0
1
2
-20
-10
0
10
20
30 Cin=1uF
Cout=10uF Tantalum
Preload=100mA
Temperature (
o
C)
Load Regulation vs Temperature
Output Voltage Deviation (%)
-25 0 25 50 75 100 125
- 1
-0.80
-0.40
-0.20
0
0.20
I load=1.5A
Output Current (A)
Dropout Voltage vs Output Current
Dropout Voltage (V)
0
0. 2
0. 4
0. 6
0. 8
1. 0
1. 2
1. 4
1. 6
1. 8
2. 0
0
Tj = 25
o
C
Tj = 125
o
C
0.25 0.5 0.75 1.0 1.25 1.5
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
6/9
Marking Information
Logo
Part Number
1086 for ADJ
86-VV : 15 for 1.5V
18 for 1.8V
25 for 2.5V
33 for 3.3V
50 for 5V
YY : Year
WW: Nth week
X : Internal code ( Optional)
( Top View)
AC
86-VV
YYWWX X Blank: normal
L: Lead Free Package
(TO252-3L)
Logo
Part Number
VV : 15 for 1.5V
18 for 1.8V
25 for 2.5V
33 for 3.3V
50 for 5V
Blank for ADJ
YY : Year
WW: Nth week
X : Internal code ( Optional)
( Top View)
AC
1086-VV
YYWWX X Blank: normal
L: Lead Free Package
(TO220-3L / TO263-3L)
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
7/9
Package Dimension
(1) TO263-3L
E
e
A
L2
C2
C
L1
b
b2
D
L3
L
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 4.06 4.45 4.83 0.160 0.175 0.190
b 0.51 0.75 0.99 0.020 0.030 0.039
b2 1.14 1.27 1.40 0.045 0.050 0.055
C 0.38 TYP. 0.015 TYP.
C2 1.14 1.27 1.40 0.045 0.050 0.055
D 8.65 9.15 9.65
0.341 0.360 0.380
E 9.65 9.97 10.29 0.380 0.393 0.405
e 2.54 BSC. 0.100 BSC.
L 14.61 15.24 15.88 0.575 0.600 0.625
L1 2.28 2.54 2.80
0.090 0.100 0.110
L2 - 1.30 2.92 - 0.051 0.115
L3 1.27 1.52 1.78 0.050 0.060 0.070
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
8/9
(2) TO252-3L
b2
E
e
b
L2
e1
DL1
A
C1
C
A1
H
SEATING PLANE
SEE NOTE2
L
Notes:
1. JEDEC Outline: TO-252 AB
2. Mils suggested for positive contact at mounting.
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 2.18 2.29 2.39 0.086 0.090 0.094
A1 1.02 1.15 1.27 0.040 0.045 0.050
b 0.61 TYP. 0.024 TYP.
b2 5.20 5.35 5.50 0.205 0.211 0.217
C 0.46 0.52 0.58 0.018 0.020 0.023
C1 0.46 0.52 0.58 0.018 0.020 0.023
D 5.33 5.57 5.80 0.210 0.219 0.228
E 6.35 6.58 6.80 0.250 0.259 0.268
e 2.25 BSC. 0.089 BSC.
e1 4.50 BSC. 0.177 BSC.
H 9.00 9.70 10.40 0.354 0.382 0.409
L 0.51 - - 0.020 - -
L1 0.64 0.83 1.02 0.025 0.033 0.040
L2 1.52 1.78 2.03 0.060 0.070 0.080
1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
AP1086
Anachip Corp.
www.anachip.com.tw Rev.1.0 May. 14, 2004
9/9
(3) TO220-3L
A
J1
F
C
SEATING PLANE
D
Q
E
L1
L
b
e
e1
b1
ΦP
H1
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 3.55 4.20 4.85 0.140 0.165 0.191
b1 1.14 1.46 1.78 0.045 0.057 0.070
b 0.51 0.83 1.14 0.020 0.033 0.045
C 0.31 0.72 1.14 0.012 0.028 0.045
D 14.20 15.35 16.50 0.559 0.604 0.650
E 9.70 10.20 10.70 0.382 0.402 0.421
e 2.29 2.54 2.79 0.090 0.100 0.110
e1 4.83 5.08 5.33 0.190 0.200 0.210
F 0.51 0.95 1.40 0.020 0.037 0.055
H1 5.84 6.35 6.86 0.230 0.250 0.270
J1 2.03 2.48 2.92 0.080 0.098 0.115
L 12.72 13.72 14.72 0.501 0.540 0.580
L1 3.66 5.00 6.35 0.144 0.197 0.250
øP 3.53 3.81 4.09 0.139 0.150 0.161
Q 2.54 2.98 3.43 0.100 0.117 0.135
