APE1184P-18-HF datasheet, PDF - EEWORLD Datasheet

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APE1184P-18-HF: DescriptionAPE1184P-18-HF; CategoryPower/power management The power supply circuit; File Size131KB，8 Pages; ManufacturerAPEC

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APE1184P-18-HF Overview

APE1184P-18-HF

APE1184P-18-HF Parametric

Parameter Name	Attribute value
Maker	APEC
package instruction	,
Reach Compliance Code	compliant

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Advanced Power

Electronics Corp.

APE1184

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE

or FIXED-MODE REGULATOR

FEATURES

0.7V Maximum Dropout Voltage at 4A

Load Current

Built-in Thermal Shutdown

Output Current Limiting

Adjustable or Fixed Output Voltage 1.2V,

1.5V, 1.8V, 2.5V, 3.3V, 5.0V

Fast Transient Response

Good Noise Rejection

Packages: TO-252-5L, TO-220-5L and TO-263-5L

RoHS Compliant & Halogen Free

DESCRIPTIOON

APE1184 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.

TYPICAL APPLICATION

10uF

Vctrl

VOUT

2.5V/4A

470uF

3.3V

470uF

VIN

GND

Vsense

ORDERING / PACKAGE INFORMATION

APE1184 X - XX - HF

Halogen Free

Package Type

H : TO-252-5L

S : TO-263-5L

P : TO-220-5L

Output Voltage

Blank : Adj

12 : 1.2V

15 : 1.5V

18 : 1.8V

25 : 2.5V

33 : 3.3V

50 : 5.0V

Top View

TO-252-5L

Top View

TO-263-5L

Top View

TO-220-5L

Data and specifications subject to change without notice

201104017

Advanced Power

Electronics Corp.

FUNCTION DESCRIPTION

Introduction

APE1184

The APE1184 regulator is 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 APE1184 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 APE1184 can easily be programmed with

the addition of two external resistors to any voltages within the range of 1.2V 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 APE1184 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 APE1184-ADJ can be programmed to any voltages in the range of 1.2V to 15.5V with the

addition of R1 and R2 external resistors according to the following formula:

The APE1184-ADJ keeps a constant 1.25V between the Vsense pin and the Adj pin. By placing

a resistor R1 across these two pins and connecting the Vsense ans Vout pin together, a constant

current flows through R1, adding to the Iadj current and into the R2 resistor producing a voltage equal

to the (1.25/R1)*R2 + Iadj*R2. This voltage is then added to the 1.25V to set the output voltage. This

is summarized in the above equation. Since the minimum load current requirement of the APE1184-

ADJ is 10mA, R1 is typically selected to be a 121Ω resistor so that it automatically satisfies this

condition. Notice that since the Iadj is typically in the range of 50uA it only adds a small error to the

output voltage and should be considered when very precise output voltage setting is required.

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