HOLTEK HT1087 User Manual

0.5A General Purpose LDO

Features

·

Output voltage ranges: Fixed range of 1.5V, 1.8V,

2.5V, 3.3V, 5.0V or adjustable type.

·

High accuracy: ±2%

·

Low voltage drop: 1.1V (typ.), V

Applications

·

Active SCSI terminations

·

Post regulator for switching power supplies

·

Low voltage microcontrollers

General Description

The HT1087 devices are a series of three-terminal high
current low voltage regulators. They can deliver an out
put current of 0.5A and can accept input voltages up to
12V. The devices are available in both adjustable and

=5.0V at 0.5A

OUT

HT1087 Series

·

Guaranteed output current: 0.5A

·

Low quiescent current: 8mA (typ.)

·

Integrated current limit & thermal protection circuits

·

SOT89, TO92 packages

·

Motherboard clock supplies

·

Battery chargers

fixed output voltage type with a range of 1.5V to 5.0V. In
ternal current limit and thermal protection circuits pro

­vide protection against overload conditions that could
create excessive junction temperatures.

-

-

Selection Table

Part No. Output Voltage Package Marking

HT1087-ADJ Adjust

HT1087-15 1.5V

HT1087-18 1.8V

HT1087-25 2.5V

HT1087-33 3.3V

HT1087-50 5.0V

Note:

For lead free devices, a ²#² mark is suffixed at the end of the date code.

Block Diagram

V

I N

C u r r e n t

L i m i t i n g

A m p l i f i e r

T h e r m a l

P r o t e c t i o n

V

O U T

SOT89

TO92

HT1087-ADJ

HT1087-15
HT1087-18
HT1087-25
HT1087-33
HT1087-50

E r r o r
A m p .

Rev. 1.10 1 October 5, 2007

B a n d g a p

R e f e r e n c e

A D J

G N D

Pin Assignment

HT1087 Series

S O T 8 9

T o p V i e w

V I N

G N D /

A D J

G N D /

A D J

H T 1 0 8 7 - X X

V O U T

V O U T V I N

Absolute Maximum Ratings*

Input Supply Voltage ..................VSS-0.3V to VSS+13V

T O 9 2

H T 1 0 8 7 - X X

V O U T

G N D / A D J

V O U T

G N D / A D J

F r o n t V i e w

V I N

B o t t o m V i e w

V I N

Storage Temperature ...........................-50°Cto125°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

²*² Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings in­dicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.
The guaranteed specifications apply only for the test conditions listed.

Recommended Operating Conditions

Input Supply Voltage ..................VSS-0.3V to VSS+12V

Ambient Temperature ............................-40°Cto85°C

Thermal Information

Symbol Parameter Package Max. Unit

Thermal Resistance

q

JA

(Junction to Ambient)
(Assume no ambient airflow,
no heat sink)

P

D

Power Dissipation

Note: PDis measured at Ta= 25°C

SOT-89

TO-92 200

SOT-89 0.5 W

TO-92 0.5 W

200

°C/W

°C/W

Rev. 1.10 2 October 5, 2007

HT1087 Series

Electrical Characteristics

TJ=25°C, VIN=V

+1.5V, IO=10mA, unless otherwise specified (see note 1)

OUT

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

REF

Reference Voltage

2.75V £ V

IN

£ 12V

1.225 1.250 1.275 V

HT1087-15 1.470 1.500 1.530 V

HT1087-18 1.764 1.800 1.836 V

V

OUT

Output Voltage

HT1087-25 2.450 2.500 2.550 V

HT1087-33 3.234 3.300 3.366 V

HT1087-50 4.900 5.000 5.100 V

=0.5A

DV

DV

V

I

LIMIT

I

ADJ

I

SS

LOAD

LINE

DIF

Load Regulation (see note 2)

Line Regulation

Dropout Voltage (see note 3)

Current Limit (see note 4)

Adjust Pin Current
(Variable Version)

Quiescent Current
(Fixed Version)

RR Ripple Rejection

V

D

O U T

T

D

Temperature Coefficient

a

I

OUT

2.75V £ V

DV

OUT

DV

OUT

2.75V £ V

2.75V £ V

£ 12V ¾

IN

=2%, I

=0.5A ¾

OUT

=10%

£ 12V

IN

£ 12V

IN

120Hz input ripple

=22mF

C

OUT

-40°C<Ta<85°C ¾±0.4 ¾ mV/°C

1

¾

0.015 0.15 %/V

1.1 1.3 V

0.5 1.5

¾

55 120

¾

¾

60

20 mV

¾

813mA

¾

A

mA

dB

Note:

1. Specifications are production tested at room temperature, Ta. Specifications within the -40°Cto85°C
operating temperature range are assured by design, characterization and correlation withStatistical Quality
Controls (SQC).

2. Loadregulation is measured at a constant junction temperature, using pulse testing with a low ON time and
is guaranteed up to the maximum power dissipation. Power dissipation is determined by the input/output

differential voltage and the output current. Guaranteed maximum power dissipation will notbe available over

the full input/output range. The maximum allowable power dissipation at any ambient temperature is

=(T

P

D

J(MAX)

- Ta ) / qJA.

3. Dropoutvoltage is defined as the input voltage minus the output voltage that produces a 2% change inthe
output voltage from the value at V

IN=VOUT

+1.5V with a fixed load.

4. Current limit is measured by pulsing for a short time.

Rev. 1.10 3 October 5, 2007

Application Circuits

Basic Circuits

·

Variable voltage type

HT1087 Series

V

I N

C 1

1 0

m

C o m m o n C o m m o n

Note:

C1 isrequired if the needed if the device is located far from filter capacitors, the recommended value is 10mF.

V I N

H T 1 0 8 7 - A D J

F

V=V(1+

OUT REF ADJ

A D J

I

A D J

V O U T

V

R2

)+I R2

R1

R E F

S i n g l e p o i n t G N D

R 1
1 2 5

W

R 2
1 k

W

V

O U T

C 2

1 0

F

m

C2 is required for stability, the recommended value is 10mF.
R1 is required for regulation, the recommended value is 125W.

·

Fixed voltage type

V

I N

V I N

H T 1 0 8 7

V O U T

V

O U T

S e r i e s

C 1

F

1 0

m

G N D

C 2

F

1 0

m

C o m m o n C o m m o n

Note:

C1 isrequired if the needed if the device is located far from filter capacitors, the recommended value is 10mF.

S i n g l e p o i n t G N D

C2 is required for stability, the recommended value is 10mF.

Typical Application Circuits

·

1.25~10.5V regulator

2 . 7 5 V£V

C o m m o n C o m m o n

1 2 V

I N

£

C 1

1 0

m

V I N

H T 1 0 8 7 - A D J

F

V=V(1+

OUT REF ADJ

A D J

I

A D J

V O U T

V

R2

)+I R2

R1

R E F

S i n g l e p o i n t G N D

R 1
1 2 5

W

R 2
1 k

W

V

O U T

C 2

1 0

F

m

Rev. 1.10 4 October 5, 2007

·

Digitally selected outputs

HT1087 Series

V

I N

C 1

1 0

V I N

H T 1 0 8 7 - A D J

F

m

R 2 R 3 R 4 R 5 R n

C o m m o n C o m m o n

N o t e : R 2 c a n s e t t h e m a x i m u m v o l t a g e .

·

High output current positive voltage regulator

T r 1

V

I N

R 1

C 1

1 0

F

m

C o m m o n C o m m o n

V

V O U T

O U T

R 1
1 2 5

A D J

I n p u t s

I

C 1

V I N

H T 1 0 8 7

S e r i e s

V O U T

I

R E G

G N D

W

S i n g l e p o i n t
G N D

C 2

1 0

C 2

1 0

F

m

V

O U T

I

O

F

m

S i n g l e p o i n t G N D

·

Increased Output voltage Circuit

V

I N

C o m m o n C o m m o n

V

=

IO = I

B E 1

I

-

R E G

+ I

C 1

I

C 1

( 1 +b)

R E G

V O U T

,

V

O U T

R

1

V I N

H T 1 0 8 7

S e r i e s

C 1

1 0

F

m

G N D

I

S S

D 1

S i n g l e p o i n t G N D

V=V+V

OUT XX D1

V

XX

R=

1

I

SS

C 2

V

1 0

X X

F

m

R 1

Rev. 1.10 5 October 5, 2007

·

Dual Supply Circuit

HT1087 Series

I C 1

V

I N

I C 2

V I N

H T 1 0 8 7

S e r i e s

C 1

1 0

F

m

G N D

V I N

V O U T

H T 1 0 8 7

S e r i e s

C 2

1 0

F

m

G N D

R 1

V O U T

V

O U T 1

V

X X 1

V

X X 2

C 3

1 0

F

m

V

O U T 2

C o m m o n C o m m o n

·

Tracking Voltage Regulator

V

I N

- V

I N

V I N

C 1
1 0

F

m

S i n g l e p o i n t G N D

S i n g l e p o i n t G N D

V=V+V

OUT1 XX2 XX1

V=V

OUT2 XX2

H T 1 0 8 7

V O U T

S e r i e s

G N D

R

-V = V x

OOUT

A

R

B

V

O U T

C 2
1 0

m

R

F

A

R

B

- V

O

Rev. 1.10 6 October 5, 2007

Package Information

3-Pin SOT89 Outline Dimensions

HT1087 Series

A

B

E

G

F

Symbol

H

Dimensions in mil

Min. Nom. Max.

A 173

B64

C90

D35

E 155

F14

G17

H

¾

I55

J14

I

J

C

D

¾

¾

¾

¾

¾

¾

¾

59

¾

¾

181

72

102

47

167

19

22

¾

63

17

Rev. 1.10 7 October 5, 2007

3-Pin TO92 Outline Dimensions

HT1087 Series

A

B

D

C

E

F

G

H

Symbol

Min. Nom. Max.

A 170

B 170

C 500

D11

E90

F45

G45

H 130

I8

Dimensions in mil

¾

¾

¾¾

¾

¾

¾

¾

¾

¾

a 4°¾6°

200

200

20

110

55

65

160

18

Rev. 1.10 8 October 5, 2007

Product Tape and Reel Specifications

Reel Dimensions

HT1087 Series

T 2

A

B

T 1

D

SOT89

Symbol Description Dimensions in mm

A Reel Outer Diameter

B Reel Inner Diameter

180±1.0

62±1.5

C Spindle Hole Diameter 12.75+0.15

D Key Slit Width

1.9±0.15

T1 Space Between Flange 12.4+0.2

T2 Reel Thickness

17-0.4

C

Rev. 1.10 9 October 5, 2007

TO92 Reel Dimensions (Unit: mm)

HT1087 Series

P a c k a g e U p , F l a t S i d e U p

3 0

P a c k a g e U p , F l a t S i d e D o w n

5 8

8 8

3 6 0

4 3

Rev. 1.10 10 October 5, 2007

Carrier Tape Dimensions

E

HT1087 Series

D

P 1P 0

t

F

PD 1

A 0

W

C

SOT89

Symbol Description Dimensions in mm

W Carrier Tape Width

P Cavity Pitch

E Perforation Position

F Cavity to Perforation (Width Direction)

12.0+0.3

8.0±0.1

1.75±0.1

5.5±0.05

D Perforation Diameter 1.5+0.1

D1 Cavity Hole Diameter 1.5+0.1

P0 Perforation Pitch

P1 Cavity to Perforation (Length Direction)

A0 Cavity Length

B0 Cavity Width

K0 Cavity Depth

t Carrier Tape Thickness

4.0±0.1

2.0±0.10

4.8±0.1

4.5±0.1

1.8±0.1

0.30±0.013

C Cover Tape Width 9.3

B 0

K 0

-0.1

Rev. 1.10 11 October 5, 2007

TO92 Carrier Tape Dimensions

HT1087 Series

P

H 1

H

H 0

F 1 F 2

P 2

P 0

l 1

D 0

TO92

Symbol Description Dimensions in mm

I1 Taped Lead Length (2.5)

P Component Pitch

P

P

F

F

Dh

0

2

1

2

Perforation Pitch

Component to Perforation (Length Direction)

Lead Spread

Lead Spread

Component Alignment

W Carrier Tape Width

W

W

W

H

0

H

1

D

0

Hold-down Tape Width

0

Perforation Position

1

Hold-down Tape Position (0.5)

2

Lead Clinch Height

Component Height Less than 24.7

Perforation Diameter

t Taped Lead Thickness

H Component Base Height

Note:

Thickness less than 0.38±0.05mm~0.5mm

12.7±1.0

12.7±0.3

6.35±0.4

2.5+0.4

2.5+0.4

0±0.1

18.0+1.0

6.0±0.5

9.0±0.5

16.0±0.5

4.0±0.2

0.7±0.2

19.0±0.5

P0 Accumulated pitch tolerance: ±1mm/20pitches.

( ) Bracketed figures are for consultation only

-0.1

-0.1

-0.5

h

D

W 2

W 0

W 1

W

t

Rev. 1.10 12 October 5, 2007

Holtek Semiconductor Inc. (Headquarters)

No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: [phone]
Fax: [phone]
http://www.holtek.com.tw

Holtek Semiconductor Inc. (Taipei Sales Office)

4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: [phone]
Fax: [phone]
Fax: [phone] (International sales hotline)

HT1087 Series

Holtek Semiconductor Inc. (Shanghai Sales Office)

7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233
Tel: [phone]
Fax: [phone]
http://www.holtek.com.cn

Holtek Semiconductor Inc. (Shenzhen Sales Office)

5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District,
Shenzhen, China 518057
Tel: [phone]
Fax: [phone]

Holtek Semiconductor Inc. (Beijing Sales Office)

Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031
Tel: [phone]
Fax: [phone]

Holtek Semiconductor Inc. (Chengdu Sales Office)

709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016
Tel: [phone]
Fax: [phone]

Holmate Semiconductor, Inc. (North America Sales Office)

46729 Fremont Blvd., Fremont, CA 94538
Tel: [phone]
Fax: [phone]
http://www.holmate.com

Copyright Ó 2007 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek as
sumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.

-

Rev. 1.10 13 October 5, 2007