APE1185S-25 - Advanced Power Electronics Corp. USA

3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

This datasheet contains new product information. Advanced Power Electronics Corp. reserves the rights to modify the product specification without notice. No liability is

assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

200926071-1/7

 Feature

• 0.7V maximum dropout voltage at 3A 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: TO252-5L, TO220-5L and TO263-5L

 General Description

APE1185 is a 3A 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

APE1185 X - XX

Low Dropout Regulator Package Vout

H:TO252-5L

S:TO263-5L

P:TO220-5L

Blank : Adj

15 = 1.5V

18 = 1.8V

25 = 2.5V

33 = 3.3V

50 = 5.0V

 Typical Application

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Vctr1

Vin

VOUT

Vsense

GND 470uF

470uF

10uF

3.3V

2.5V/3A

RoHS Compliant

12 = 1.2V

3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

2/7

 Block Diagram

THERMAL

SHUTDOWN

Vout

Adj

1.25V +

CURRENT

LIMIT

Vin

Vsense

Vctrl

 Pin Configuration

(APE1185S) (APE1185P)

Tab is Vout

FRONT VIEW

Vout

Vsense

Adj(GND)

Vctrl

Vin

Tab is Vout

FRONT VIEW

Vout

Vsense

Adj(GND)

Vctrl

Vin

( APE1185H )

 Pin Descriptions

Name I/O Description

Adj

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

(GND only for fixed mode)

Vsense I

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.

Vin I

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.

Vctrl I

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 the

device to regulate. A minimum of 100uF capacitor must be connected from this pin to

ground to insure stability.

Vout O

The output of the regulator. A minimum of 100uF capacitor must be connected from

this pin to ground to insure stability.

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1 Vsense

4 Vctrl

3 Vout

2 Adj(GND)

5 Vin

FRONT VIEW

Metal

Tab

GND

Tab is Vout

(1.2V)

3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

3/7

 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 Range -65 to +150 oC

TOP Operation Junction Temperature Range 0 to +150 oC

 Electrical Characteristics

Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150oC. Typical value refer to Tj=25oC.

Vout=Vsense.

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

VREF Reference Voltage APE1185-Adj Io=10mA, Tj=25oC, (Vin-Vout)=0.7V,

Vctrl=VIN+1V 1.225 1.250 1.275 V

Line Regulation APE1185-XX IO=10mA, VOUT+0.7V<VIN<12V, TJ =25oC

Vctrl=VIN+1V 0.5 %

APE1185-1.5 IOUT = 10mA, TJ = 25oC, 2.2V≦VIN≦12V

Vctrl=VIN+1V 1.470 1.500 1.530 V

APE1185-1.8 IOUT = 10mA, TJ = 25oC, 2.5V≦VIN≦12V

Vctrl=VIN+1V 1.764 1.800 1.836 V

APE1185-2.5 IOUT = 10mA, TJ = 25oC, 3.2V≦VIN≦12V

Vctrl=VIN+1V 2.450 2.500 2.550 V

APE1185-3.3 IOUT = 10mA, TJ = 25oC, 4.0V≦VIN≦12V

Vctrl=VIN+1V 3.235 3.300 3.365 V

Vout Output Voltage

APE1185-5.0 IOUT = 10mA, TJ = 25oC, 5.7V≦VIN≦12V

Vctrl=VIN+1V 4.900 5.000 5.100 V

APE1185-Adj 0mA<Io<3A, TJ =25oC

(VIN- VOUT)=2V ,Vctrl =VIN + 1V 1 %

APE1185-1.5 VIN=3V, 0mA<Io<3A, TJ =25oC

Vctrl=4V 12 15 mV

APE1185-1.8 VIN=3.3V, 0mA<Io<3A, TJ =25oC

Vctrl=4.3V 15 18 mV

APE1185-2.5 VIN=4V, 0mA<Io<3A, TJ =25oC

Vctrl=5V 20 25 mV

APE1185-3.3 VIN = 5V, 0mA<Io<3A, TJ=25oC

Vctrl=6V 26 33 mV

Load

Regulation

APE1185-5.0 VIN = 8V, 0mA<Io<3A, TJ=25oC

Vctrl=9V 40 50 mV

Dropout Voltage

(Vctrl –Vout)

Vadj=0V for all conditions below.

Vin=2.05V, Io=1.5A

Vin=2.05V, Io=2A

Vin=2.05V, Io=3A

1.25

1.15

1.25

1.40

Dropout Voltage

(Vin -Vout)

Vadj=0V for all conditions below.

Vctrl =2.75V, Io=1.5A

Vctrl =2.75V, Io=2A

Vctrl =2.75V, Io=3A

0.26

0.50

0.70

0.38

0.60

0.85

Current Limit Vctrl =2.75V, Vin=2.05V,∆Vo=100mV, Vadj=0V 3.5 A

Minimum Load

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

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APE1185-1.2 IOUT = 10mA, TJ = 25oC, 2.2V≦VIN≦12V

Vctrl=VIN+1V 1.176 1.200 1.224 V

APE1185-1.2 VIN=3V, 0mA<Io<3A, TJ =25oC

Vctrl=4V 10 12 mV

3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

4/7

 Electrical Characteristics(Continued)

Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150oC. Typical value refer to Tj=25oC.

Vout=Vsense.

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

Thermal Regulation 30mS Pulse 0.01 0.02 %/W

Ripple Rejection Vctrl =5V, Vin=5V, Io=3A, Vadj=0V, Tj=25, Vripple=1Vpp at

120Hz 60 70 dB

Control Pin Current

Vadj=0V for all conditions below.

Vctrl =2.75V, Vin=2.05V, Io=1.5A

Vctrl =2.75V, Vin=2.05V, Io=2A

Vctrl=2.75V, Vin=2.05V, Io=3A

Iadj Adjust Pin Current Vctrl=2.75V, Vin=2.05,Vadj=0 50 150 µA

θ Thermal Resistance

Junction-to-Case

TO-263: Control Circuitry/Power Transistor

TO-220: Control Circuitry/Power Transistor

TO-252: Control Circuitry/Power Transistor

2.7

OC/W

NOTE:

APE1185-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable

maximum junction temperature.

 Functional Descriptions

Introduction

The APE1185 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 APE1185 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 APE1185

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 APE1185 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 APE1185-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:

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3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

5/7

 Functional Descriptions(Continued)

Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically

APE1185-ADJ

Vin

Vctrl Adj

Vout

Vsense

R1+

R2+

Vref

Iadj=50uA

The APE1185-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

APE1185-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.

Load Regulation

Since the APE1185 has separate pins for the output

(Vout) and the sense (Vsense), it is ideal for

providing true remote sensing of the output voltage

at the load. This means that the voltage drops due

to parasitic resistance such as PCB traces between

the regulator and the load are compensated for

using remote sensing. Figure following shows a

typical application of the APE1185-ADJ with remote

sensing.

APE1185-ADJ

Vin

Vctrl

Vin

Vctrl

Vout

Vsense

Adj R1

Stability

The APE1185-XX requires the use of an output

capacitor as part of the frequency compensation in

order to make the regulator stable. Typical designs

for the microprocessor applications use standard

electrolytic capacitors with typical ESR in the range

of 50 to 100mΩ and an output capacitance of

100uF to 1000uF. Fortunately as the capacitance

increases, the ESR decreases resulting in a fixed

RC time constant. The APE1185-XX takes

advantage of the phenomena in making the overall

regulator loop stable. For most applications a

minimum of 100uF aluminum electrolytic capacitor

insures both stability and good transient response.

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3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

6/7

 Performance Characteristic

Output Current (A)

control

Dropout Voltage vs Output Current

Vcontrol Dropout Voltage (mV)

800

900

1000

1100

1200

Vpower = 2.05 V

Tj = 20

Tj = 120

00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Output Current (A)

power

Dropout Voltage vs Output Current

Vpower Dropout Voltage (mV)

00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

100

150

200

250

300

350

400

450

500

550

600

650

700

750

800

Vcontrol = 2.75 V

Tj = 120

Tj = 20

Junction Temperature (

Reference Voltage vs Junction Temperature

1. 247

1. 248

1. 249

1. 250

Reference Voltage (V)

1. 251

1. 252

1. 253

020 40 60 80 100 120

Output Current (A)

Load Regulation vs Output Current

Load Regulation (%)

0. 02

0. 04

0. 06

0. 08

0. 10

0. 12

0. 14

0. 15

Tj = 20

Tj = 120

00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

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3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

APE1185

7/7

 Performance Characteristic (continued )

Transient Response

 Marking Information

1185X-XX

Y WW SSS

Logo

Part Number

SSS: Internal code ( Optional)

( Top View)

XX: Blank=adj,

12= 1.2V, 15= 1.5V

18= 1.8V, 25= 2.5V

33= 3.3V, 50= 5.0V

Y : Year : "1"=2001

"2"=2002

WW : Nth week : 01~52

( TO252-5L / TO220-5L / TO263-5L )

VCONTROL = 5.0V

VPOWER = 3.3V

VOUT = 2.5V

CCONTRROL=10uF

CPOWER = 100uF

CADJ = 0.1uF

COUT = 470uF

ILOAD

10mA to 3A

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Package Code

Package Outline : TO-263-5L

Millimeters

MIN NOM MAX

A 4.40 4.60 4.80

b 0.66 0.79 0.91

L4 0.00 0.15 0.30

c 0.36 0.43 0.50

L1 2.29 2.54 2.79

E 9.80 10.10 10.40

c2 1.25 1.35 1.45

D 8.60 8.80 9.00

L 14.60 15.20 15.80

0° 4° 8°

1.All Dimensions Are in Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : TO-263-5L

7.60

1.27

5.90

1.70

SYMBOLS

ADVANCED POWER ELECTRONICS CORP.

Part Numbe

1185S-XX

YWWSSS LOGO

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Part Numbe

YWWSSS LOGO

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Output Voltage

Package Code

Package Outline : TO-252(5L)

Millimeters

MIN NOM MAX

A 6.40 6.6 6.80

B 5.2 5.35 5.50

C 6.80 7.00 7.20

D 2.20 2.50 2.80

S 0.50 0.65 0.80

E3 E3 3.50 4.00 4.50

G 0.40 0.50 0.60

H 2.20 2.30 2.40

J 0.45 0.50 0.55

K 0.00 0.075 0.15

L 0.90 1.20 1.50

M 5.40 5.60 5.80

1.All Dimensions Are in Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : TO-252(5L)

SYMBOLS

1.27 REF.

ADVANCED POWER ELECTRONICS CORP.

Part Number

1185H-XX

YWWSSS Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

LOGO

Output Voltage

Package Code

Package Outline : TO-220-5L

Millimeters

MIN NOM MAX

A4.07 4.45 4.82

b0.76 0.89 1.02

C0.36 0.50 0.64

D14.22 14.86 15.50

E9.78 10.16 10.54

e1.57 1.71 1.85

e1 6.68 6.81 6.93

F1.14 1.27 1.40

H1 5.46 6.16 6.86

J1 2.29 2.74 3.18

L13.21 13.97 14.73

3.68 3.81 3.94

2.54 2.73 2.92

1.All Dimensions Are in Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : TO-220-5L

SYMBOLS

ADVANCED POWER ELECTRONICS CORP.

φp

YWWSSS

Part Number

LOGO 1185P-XX

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Output Voltage

Package Code