Diodes AP1184 User Manual
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Features
General Description
• 0.85V maximum dropout voltage at 4A load current
• Built-in Thermal shutdown
• Output current limiting
• Adjustable or fixed output voltage1.5V, 1.8V, 2.5V,
3.3V, 5.0V
• Fast transient response
• Good noise rejection
• Packages: TO220-5L and TO263-5L
• Lead Free Finish/ RoHS Complian (Note 1)
AP1184 is a 4A regulator with extremely low dropout voltage.
This product is specifically designed to provide well regulated
supply for applications requiring 2.8V or lower voltages from 3.3V
ATX power supplies where high efficiency of the switch can be
achieved without the cost and complexity associated with
switching regulator. One such application is the new graphic
chipsets that requires anywhere from 2.4V to 2.7V supply.
Ordering Information
XX
Vout
Package
K5 : TO263-5L
T5 : TO220-5L
AP1184
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Device
AP1184K5XXL-U K5 TO263-5L 50 -U NA NA
Lead-free
AP1184K5XXL-13 K5 TO263-5L NA NA 800/Tape & Reel -13
Lead-free
AP1184T5XXL-U T5 TO220-5L 50 -U NA NA
Lead-free
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
Package
Code
Packaging
(Note 2)
.
L X
XX
-
Quantity
-
Lead Free
L : Lead Free
Tube 13” Tape and Reel
Part Number
Suffix
Packing
U : Tube
13 : Tape & Reel
Quantity
Part Number
Suffix
AP1184 Rev. 5 1 of 12 SEPTEMBER 2008
www.diodes.com © Diodes Incorporated
A
Pin Assignments
FRONT VIEW
5
4
3
2
1
Tab is Vout
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Vin
Vctrl
Vout
Adj(GND)
Vsense
FRONT VIEW
5
4
3
2
1
Tab is Vout
Vin
Vctrl
Vout
Adj(GND)
Vsense
TO263-5L
Pin Descriptions
Pin Numbers with standard type are for TO220-5L, TO263-5L packages.
Name I/O Description
Adj
(GND)
resistor divider from this pin to the Vout pin and ground sets the output voltage. (GND
only for fixed mode)
This pin is the positive side of the reference that allows remote load sensing to achieve
Vsense I
excellent load regulation. A minimum of 10uF capacitor must be connected from this pin
to ground to insure stability.
The input of the regulator. Typically a large storage capacitor is connected from this pin
Vin I
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 higher than Vout in
order for the device to regulate.
This pin is the supply pin for the internal control circuit as well as the base drive for the
Vctrl I
pass transistor. This pin must always be higher than the Vout pi n in ord er to regu late the
device. A minimum of 100uF capacitor must be connected from this pin to ground to
insure stability.
Vout O
The output of the regulator. A minimum of 100uF capacitor must be connected from this
pin to ground to insure stability.
Block Diagram
TO220-5L
Vin
Vctrl
CURRENT
LIMIT
THERMAL
SHUTDOWN
+
+
-
1.25V
+
+
-
Vout
Vsense
Adj
AP1184 Rev. 5 2 of 12 SEPTEMBER 2008
www.diodes.com © Diodes Incorporated
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
Typical Application Circuit
(1) Adjustable Regulator
3.3V
FIXED-MODE REGULATOR
5V
470µF
Vctrl
Vout
Vsense
Tab is Vout
(2) 3.3V to 2.5V Fixed Mode Regulator
3.3V
470µF
Vctrl
Vout
GND
Vsense
Vin
Adj
Vin
V:Note +×=
OUT
V
REF
R1
R2
121
121
1(
470µF
Ω
Ω
2.5V/ 4A
470µF
R
2
)
R
1
5V
470µF
2.5V/ 4A
470µF
Tab is Vout
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VIN Input Voltage 16 V
V
Control Input voltage 18 V
ctrl
PD Power dissipation Internally limited
TST Storage temperature Range -65 to +150
TOP Operation Junction Temperature Range 0 to +125
AP1184 Rev. 5 3 of 12 SEPTEMBER 2008
www.diodes.com © Diodes Incorporated
o
C
o
C
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics (Under Operating Conditions)
Unless otherwise specified, these specifications apply over, Cin = 1uF, C
V
out
= V
sense
Sym. Parameter Test Condition Min Typ. Max Unit
=10mA, TA = 25oC, (Vin-V
I
V
Reference Voltage AP1184-Adj
REF
Line Regulation AP1184-XXX
AP1184-1.5
AP1184-1.8
V
Output Voltage
out
AP1184-2.5
AP1184-3.3
AP1184-5.0
AP1184-Adj
AP1184-1.5
Load
Regulation
AP1184-1.8
AP1184-2.5
AP1184-3.3
AP1184-5.0
= 0V for all conditions below.
V
adj
Dropout Voltage
–V
(V
)
ctrl
out
Dropout Voltage
(Vin – V
out
)
Current Limit
Minimum Load
Current
= 2.05V, Io = 1.5A
V
in
V
= 2.05V, Io = 3A
in
= 2.05V, Io = 4A
V
in
V
= 0V for all conditions below.
adj
V
= 2.75V, Io = 1.5A
ctrl
= 2.75V, Io = 3A
V
ctrl
V
=2.75V, Io =4A
ctrl
V
= 2.75V, Vin = 2.05V, ΔVo = 100mV, V
ctrl
V
= 5V, Vin = 3.3V, V
ctrl
Thermal Regulation 30mS Pulse 0.01 0.02 %/W
Ripple Rejection
Vctrl = 5V, Vin = 5V, Io = 4A, Vadj = 0V, Tj = 25, Vripple =1Vpp
at 120Hz
Vadj = 0V for all conditions below.
Control Pin Current
Vctrl = 2.75V, Vin = 2.05V, Io = 1.5A
Vctrl = 2.75V, Vin = 2.05V, Io = 3A
Vctrl = 2.75V, Vin = 2.05V, Io = 4A
o
= VIN+1V
V
ctrl
= 10mA, V
I
O
V
= VIN+1V
ctrl
= 10mA, TA = 25oC, 2.2VVIN12V
I
OUT
= VIN+1V
V
ctrl
= 10mA, TA = 25oC, 2.5VVIN12V
I
OUT
V
= VIN+1V
ctrl
= 10mA, TA = 25oC, 3.2VVIN12V
I
OUT
= VIN+1V
V
ctrl
= 10mA, TA = 25oC, 4.0VVIN12V
I
OUT
V
= VIN+1V
ctrl
= 10mA, TA = 25oC, 5.7VVIN12V
I
OUT
= VIN+1V
V
ctrl
0mA<Io<4A, T
(V
- V
IN
= 3V, 0mA<Io<4A, TA = 25oC
V
IN
= 4V
V
ctrl
= 3.3V, 0mA<Io<4A, TA = 25oC
V
IN
V
= 4.3V
ctrl
= 4V, 0mA<Io<4A, TA = 25oC
V
IN
= 5V
V
ctrl
= 5V, 0mA<Io<4A, TA = 25oC
V
IN
V
= 6V
ctrl
= 8V, 0mA<Io<4A, TA = 25oC
V
IN
V
= 9V
ctrl
OUT
A
) =2V ,V
OUT
= 0V 5 10 mA
adj
= 10uF, and Tj = 0 to 150oC. Typical value refer to TA = 25oC.
out
) = 0.7V,
out
+0.7V<VIN<12V, TA = 25oC
1.225 1.250 1.275 V
0.2 %
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
= 25oC
= VIN + 1V
ctrl
1 %
12 15 mV
15 18 mV
20 25 mV
26 33 mV
40 50 mV
1.10
0.26
0.50
0.70
adj
= 0V
4.2 A
60 70 dB
6
30
33
1.15
1.18
1.25
0.38
0.60
0.85
25
60
70
V
mA
V
AP1184 Rev. 5 4 of 12 SEPTEMBER 2008
www.diodes.com © Diodes Incorporated
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