Diodes AP1186 User Manual

AP1186

1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR

Features

General Description

• Adjustable or Fixed output voltage 1.5V, 1.8V, 2.5V,

3.3V, 5.0V

• 0.5V Maximum Dropout voltage at 1.5A Load current

• Built-in Thermal Shutdown

• Output Current Limiting

• Fast transient response

• Good noise rejection

• Packages: TO220-5L, TO263-5L

• Lead Free Finish/RoHS Compliant for Lead Free

products (Note 1)

AP1186 is a 1.5A 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 a switcher can be
achieved without the cost and complexity associated with a
switching regulator. One such application is the new graphic chip
sets that require anywhere from 2.4V to 2.7V supply.

Ordering Information

X X X

1186

AP

Package Vout

K5:TO263-5L
T5:TO220-5L

Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.

Device

AP1186T5 T5 TO220-5L 50 -U NA NA

Lead-free

AP1186K5 K5 TO263-5L 50 -U 800/Tape & Reel -13

Lead-free

Note: 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

X -

Blank : Adj
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
50 : 5.0V

Packaging

(Note 2)

.

Lead Free

L : Lead Free Package

Tube 13” Tape and Reel

Quantity

Part Number

Suffix

Packing

-U : Tube

-13: Taping

Quantity

Part Number

Suffix

Typical Application

AP1186 Rev. 1 1 of 9 MARCH 2007

3V 5V

+

470uF

Vin

Vctrl
Vou

t

GND

Vsense

5
4
3

2
1

+

470uF

+

470uF

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2.5
V

/1.5A

Block Diagram

Vin

AP1186

1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR

Vout

Vctrl

CURRENT

LIMIT

THERMAL

SHUTDOWN

Package Connect Diagram

5 PIN TO263 5 PIN TO220

FRONT VIEW

Vin

5

Vctrl

4
3

Vout
Adj(GND)

2

Vsense

1

Tab is Vout

+

+

-

1.25V

+

+

-

Vsense

Adj

FRONT VIEW

5

4
3

2
1

Tab is Vout

Vin

Vctrl
Vout
Adj(GND)
Vsense

Pin Descriptions

Name I/O Description

Vsense I

Adj

(GND)

Vout O

Vctrl I

Vin I

AP1186 Rev. 1 2 of 9 MARCH 2007

This pin is the positive side of the reference that allows remote load sensing to achieve excellent load
regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability.

A resistor divider from this pin to the Vout pin and ground sets the output voltage.
(GND only for fixed mode)

The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground
to insure stability.

This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor.
This pin must always by higher than the Vout pin in order for the device to regulate. A minimum of
100uF 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 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.

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T

AP1186

1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR

Absolute Maximum Ratings

Symbol Parameter Rating Unit

Vin Input Voltage 16 V

Vctrl Control Input Voltage 18 V

PD Power Dissipation Internally Limited
TST Storage Temperature -65 to +150

TOP Operating Junction Temperature Range 0 to +150

Electrical Characteristics

Unless otherwise specified, these specifications apply over, Cin = 1uF, Cout = 10uF, and T

o

25

C. Vout = Vsense.

SYM. Parameter Test Condition Min. Typ. Max. Unit

Reference

V

REF

Voltage

AP1186-Adj

AP1186-1.5

AP1186-1.8

V

Output Voltage

out

AP1186-2.5

AP1186-3.3

AP1186-5.0

Line Regulation AP1186-XXX

AP1186-Adj

AP1186-1.5

AP1186-1.8

Load Regulation

AP1186-2.5

AP1186-3.3

AP1186-5.0

Dropout Voltage
(Vctrl-Vout)
Dropout Voltage
(Vin-Vout)

Vadj = 0V for all conditions below.
Vin = 2.05V, Io = 1.5A
Vadj = 0V for all conditions below.
Vctrl = 3V, Io = 1.5A

Current Limit Vctrl = 3V, Vin = 2.05V, ∆Vo = 100mV, Vadj = 0V 1.6 A

Minimum Load
Current

Vctrl = 5V, Vin = 3.3V, Vadj = 0V 5 10 mA

AP1186 Rev. 1 3 of 9 MARCH 2007

= 25oC,(VIN-V

A

V

= VIN+1V

ctrl

I

= 10mA, TA = 25oC, 2V≦VIN≦12V

OUT

= VIN+1V

V

ctrl

I

= 10mA, TA = 25oC, 2.3V≦VIN≦12V

OUT

V

= VIN+1V

ctrl

I

= 10mA, TA = 25oC, 3V≦VIN≦12V

OUT

V

= VIN+1V

ctrl

I

= 10mA, TA = 25oC, 3.8V≦VIN≦12V

OUT

= VIN+1V

V

ctrl

I

= 10mA, TA = 25oC, 5.5V≦VIN≦12V

OUT

V

= VIN+1V

ctrl

I

= 10mA, V

O

V

= VIN+1V

ctrl

0mA<Io<1.5A, T

– V

(V

IN

V

= 3V, 0mA<Io<1.5A, TA = 25oC

IN

V

= 4V

ctrl

V

= 3.3V, 0mA<Io<1.5A, TA = 25oC

IN

V

= 4.3V

ctrl

V

= 4V, 0mA<Io<1.5A, TA = 25oC

IN

V

= 5V

ctrl

V

= 5V, 0≦I

IN

T

= 25oC V

A

V

= 8V, 0≦I

IN

T

= 25oC V

A

) = 2V, V

OUT

ctrl

ctrl

) = 0.5V,IO = 10mA

OUT

+0.5V<VIN<12V

OUT

=25oC

A

= VIN + 1V

ctrl

≦1.5A, TA = 25oC ,

OUT

= 6V

≦1.5A, TA= 25oC ,

OUT

= 9V

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FIXED-MODE REGULATOR

o

C

o

C

= 0 to 150oC. Typical value refers to TA =

J

1.225 1.250 1.275 V

1.470 1.500 1.530

1.764 1.800 1.836

2.450 2.500 2.550

3.235 3.300 3.365

4.900 5.000 5.100

0.2 %

1 %

12 15 mV

15 18 mV

20 25 mV

26 33 mV

40 50 mV

1.23

0.26 0.38

V

V

V