AP1184K5(2014) Ver la hoja de datos (PDF) - Diodes Incorporated.

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componentes Descripción

Fabricante

AP1184K5
(Rev.:2014)

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR

Diodes Incorporated. 

NOT RECOMMENDED FOR NEW DESIGN

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 TO263-5L: Control Circuitry/Power Transistor (Note 4)

Junction-to-Ambient TO220-5L: Control Circuitry/Power Transistor (Note 5)

61

OC/W

31

OC/W

θJC Thermal Resistance TO263-5L: Control Circuitry/Power Transistor (Note 4)

Junction-to-Case

TO220-5L: Control Circuitry/Power Transistor (Note 5)

7

OC/W

5

OC/W

Notes:

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 TO263-5L : Devise mounted on 2oz copper, minimum recommended pad layout , FR-4 PCB.

5. Test conditions for TO220-5L : with copper area of approximately 3in2 , 1oz.

Package

TO263-5L/TO220-5L

Max Pd.

Remarks

2.4W~4.4W 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. 6 - 3

5 of 12

www.diodes.com

OCTOBER 2014

© Diodes Incorporated

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