AP1184K5 DIODES [Diodes Incorporated], AP1184K5 Datasheet - Page 5

• Manufacturer Part Number: AP1184K5
• Description: 4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR
• Manufacturer: DIODES [Diodes Incorporated]

Electrical Characteristics
Unless otherwise specified, these specifications apply over, C
V
Sym.
Note:
TO263-3L/TO220-3L 2.4W~4.4W
SOP-8L
Functional Descriptions
Introduction
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
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.
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
resistors according to the following formula:
AP1184 Rev. 1
θ
ou
I
θ
adj
JA
JC
t = V
The AP1184 regulator is a 5 terminal device designed specifically to provide extremely low dropout voltages comparable to the
The AP1184 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage,
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
Adjust Pin Current
Thermal Resistance
Junction-to-Ambient
Thermal Resistance
Junction-to-Case
Package
sense
4. Test conditions for TO263-3L and TO220-3L: with copper area of approximately 3in
3. AP1184-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum
5. Test conditions for SOP-8L: mounted on 2oz. copper, minimum recommended pad layout, FR-4 PCB.
junction temperature.
Parameter
.
1W~2W
Max Pd.
V
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)
ctrl
= 2.75V, V
V
in
pin. This flexibility makes the AP1184 ideal for applications where dual inputs are available
4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
With heat sink or amount of copper board needed.
With heat sink or amount of copper board needed.
in
( Continued )
= 2.05,V
www.diodes.com
Test Condition
5 of 12
in
adjj
= 1uF, C
= 0
out
= 10uF, and T
2
, 1oz.
Remarks
j
= 0 to 150
FIXED-MODE REGULATOR
o
C. Typical value refer to T
Min. Typ. Max. Unit
118
3.5
2.5
5.4
50
23
15
©
AP1184
Diodes Incorporated
MARCH
150
A
= 25
2007
O
O
O
O
O
O
C/W
C/W
C/W
C/W
C/W
C/W
µA
o
C.