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PDF AP1184 Data sheet ( Hoja de datos )
| Número de pieza | AP1184 | |
| Descripción | 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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Features
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
General Description
• 0.85V maximum dropout voltage at 4A load current
• Built-in Thermal shutdown
• Output current limiting
• Adjustable or fixed output voltage 1.5V, 1.8V, 2.5V,
3.3V, 5.0V
• Fast transient response
• Good noise rejection
• Packages: SOP-8L, TO220-5L and TO263-5L
• Lead Free Finish/RoHS Compliant for Lead Free
products (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
AP1184 XX - X X X
Package
S :SOP-8L
K5:TO263-5L
T5:TO220-5L
Vout
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Lead Free
L : Lead Free
Packing
-U : Tube
-13 : Taping
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Note:
Device
Package
Code
Packaging
(Note 2)
Tube/Bulk
Quantity
Part Number
Suffix
AP1184SLead-free
S
SOP-8L
100
-U
AP1184K5 K5 TO263-5L 50
Lead-free
AP1184T5 T5 TO220-5L 50
Lead-free
-U
-U
13” Tape and Reel
Quantity
Part Number
Suffix
2500/Tape & Reel
-13
800/Tape & Reel
-13
NA NA
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.
AP1184 Rev. 1
1 of 12
www.diodes.com
MARCH 2007
© Diodes Incorporated
1 page  
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Electrical Characteristics ( Continued )
Unless otherwise specified, these specifications apply over, Cin = 1uF, Cout = 10uF, and Tj = 0 to 150oC. Typical value refer to TA = 25oC.
Vout = Vsense.
Sym. Parameter
Test Condition
Min. Typ. Max. Unit
I adj Adjust Pin Current
Vctrl = 2.75V, Vin = 2.05,Vadjj = 0
50 150 µA
θJA Thermal Resistance
Junction-to-Ambient
θJC Thermal Resistance
Junction-to-Case
TO263-3L: Control Circuitry/Power Transistor (Note 4)
TO220-3L: Control Circuitry/Power Transistor (Note 4)
SOP-8L: Control Circuitry/Power Transistor (Note 5)
TO263-3L: Control Circuitry/Power Transistor (Note 4)
TO220-3L: Control Circuitry/Power Transistor (Note 4)
SOP-8L: Control Circuitry/Power Transistor (Note 5)
23 OC/W
15 OC/W
118 OC/W
3.5 OC/W
2.5 OC/W
5.4 OC/W
Note:
3. AP1184-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum
junction temperature.
4. Test conditions for TO263-3L and TO220-3L: with copper area of approximately 3in2, 1oz.
5. Test conditions for SOP-8L: mounted on 2oz. copper, minimum recommended pad layout, FR-4 PCB.
Package
Max Pd.
TO263-3L/TO220-3L 2.4W~4.4W
SOP-8L
1W~2W
Remarks
With heat sink or amount of copper board needed.
With heat sink or amount of copper board needed.
Functional Descriptions
Introduction
The AP1184 regulator is a 5 terminal device designed specifically to provide extremely low dropout voltages comparable to the
PNP type without the disadvantage of the extra power dissipation due to the base current associated with PNP regulators. This is done
by bringing out the control pin of the regulator that provides the base current to the power NPN and connecting it to a voltage that is
greater than the voltage present at the Vin pin. This flexibility makes the AP1184 ideal for applications where dual inputs are available
such as a computer motherboard with an ATX style power supply that provides 5V and 3.3V to the board. One such application is the
new graphic chip sets that require anywhere from 2.4V to 2.7V supply. The AP1184 can easily be programmed with the addition of two
external resistors to any voltages within the range of 1.25V to 15.5V. Another major requirement of these graphic chips is the need to
switch the load current from zero to several amps in tens of nanoseconds at the processor pins, which translates to an approximately 300
to 500ns of current step at the regulator. In addition, the output voltage tolerances are also extremely tight and they include the transient
response as part of the specification.
The AP1184 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 number of output capacitors. Another feature of the device is its true remote
sensing capability that allows accurate voltage setting at the load rather than at the device.
Output Voltage Setting
The AP1184-ADJ can be programmed to any voltages in the range of 1.25V to 15.5V with the addition of R1 and R2 external
resistors according to the following formula:
AP1184 Rev. 1
5 of 12
www.diodes.com
MARCH 2007
© Diodes Incorporated
5 Page 
AP1184
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
Package Information ( unit: mm )
(1) SOP-8L
7°~9°
1.27typ
0.3/0.5
4.80/5.30
(2) TO263-5L
0.38/1.27
Detail "A"
Gauge Plane
Seating Plane
0.35max. 45°
7°~9°
Detail "A"
3.70/4.10
AP1184 Rev. 1
11 of 12
www.diodes.com
MARCH 2007
© Diodes Incorporated
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AP1184.PDF ] | |
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