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HT1087 Series 0.5A General Purpose LDO
Features
* Output voltage ranges: Fixed range of 1.5V, 1.8V, * Guaranteed output current: 0.5A * Low quiescent current: 8mA (typ.) * Integrated current limit & thermal protection circuits * SOT89, TO92 packages
2.5V, 3.3V, 5.0V or adjustable type.
* High accuracy: 2% * Low voltage drop: 1.1V (typ.), VOUT=5.0V at 0.5A
Applications
* Active SCSI terminations * Post regulator for switching power supplies * Low voltage microcontrollers * Motherboard clock supplies * Battery chargers
General Description
The HT1087 devices are a series of three-terminal high current low voltage regulators. They can deliver an output current of 0.5A and can accept input voltages up to 12V. The devices are available in both adjustable and fixed output voltage type with a range of 1.5V to 5.0V. Internal current limit and thermal protection circuits provide protection against overload conditions that could create excessive junction temperatures.
Selection Table
Part No. HT1087-ADJ HT1087-15 HT1087-18 HT1087-25 HT1087-33 HT1087-50 Note: Output Voltage Adjust 1.5V 1.8V 2.5V 3.3V 5.0V SOT89 TO92 HT1087-ADJ HT1087-15 HT1087-18 HT1087-25 HT1087-33 HT1087-50 Package Marking
For lead free devices, a # mark is suffixed at the end of the date code.
Block Diagram
V
IN
C u rre n t L im itin g A m p lifie r T h e rm a l P r o te c tio n V
OUT
E rro r Am p.
Bandgap R e fe re n c e
ADJ
GND
Rev. 1.10
1
October 5, 2007
HT1087 Series
Pin Assignment
SO T89 TO 92
H T 1 0 8 7 -X X H T 1 0 8 7 -X X T o p V ie w
F r o n t V ie w
GND/VOUT ADJ
V IN VOUT V IN G N D /A D J
GND/ ADJ
VOUT
V IN
B o tto m
VOUT V IN G N D /A D J
V ie w
Absolute Maximum Ratings*
Input Supply Voltage ..................VSS-0.3V to VSS+13V Storage Temperature ...........................-50C to 125C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings 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. * 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 ............................-40C to 85C
Thermal Information
Symbol Parameter Thermal Resistance (Junction to Ambient) (Assume no ambient airflow, no heat sink) Power Dissipation TO-92 0.5 W Package SOT-89 TO-92 SOT-89 Max. 200 200 0.5 Unit C/W C/W W
qJA
PD
Note: PD is measured at Ta= 25C
Rev. 1.10
2
October 5, 2007
HT1087 Series
Electrical Characteristics
Symbol VREF Parameter Reference Voltage TJ=25C, VIN=VOUT+1.5V, IO=10mA, unless otherwise specified (see note 1) Test Conditions 2.75V VIN 12V HT1087-15 HT1087-18 VOUT Output Voltage HT1087-25 HT1087-33 HT1087-50 DVLOAD DVLINE VDIF ILIMIT IADJ ISS RR
DVO DT
a UT
Min. 1.225 1.470 1.764 2.450 3.234 4.900 1 3/4 3/4 0.5 3/4 3/4 3/4 3/4
Typ. 1.250 1.500 1.800 2.500 3.300 5.000 3/4 0.015 1.1 1.5 55 8 60 0.4
Max. 1.275 1.530 1.836 2.550 3.366 5.100 20 0.15 1.3 3/4 120 13 3/4 3/4
Unit V V V V V V mV %/V V A mA mA dB mV/C
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) Ripple Rejection Temperature Coefficient
IOUT=0.5A 2.75V VIN 12V DVOUT=2%, IOUT=0.5A DVOUT=10% 2.75V VIN 12V 2.75V VIN 12V 120Hz input ripple COUT=22mF -40CNote:
1. Specifications are production tested at room temperature, Ta. Specifications within the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). 2. Load regulation 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 not be available over the full input/output range. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - Ta) / qJA. 3. Dropout voltage is defined as the input voltage minus the output voltage that produces a 2% change in the output voltage from the value at VIN = 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
HT1087 Series
Application Circuits
Basic Circuits
* Variable voltage type
V
IN
V IN C1 10mF
H T 1 0 8 7 -A D J
ADJ IA
DJ
VOUT V
REF
V R1 125W R2 1kW C2 10mF
OUT
C om m on S in g le p o in t G N D
C om m on
VOUT = VREF ( 1 + Note:
R2 ) + IADJ R2 R1
C1 is required if the needed if the device is located far from filter capacitors, the recommended value is 10mF. C2 is required for stability, the recommended value is 10mF. R1 is required for regulation, the recommended value is 125W.
* Fixed voltage type
V
IN
V IN
H T1087 S e r ie s
GND
VOUT
V
OUT
C1 10mF
C2 10mF
C om m on
S in g le p o in t G N D
C om m on
Note:
C1 is required if the needed if the device is located far from filter capacitors, the recommended value is 10mF. C2 is required for stability, the recommended value is 10mF.
Typical Application Circuits
* 1.25~10.5V regulator
2 .7 5 V V
IN
12V C1 10mF
V IN
H T 1 0 8 7 -A D J
ADJ IA
DJ
VOUT V
REF
V R1 125W R2 1kW C2 10mF
OUT
C om m on S in g le p o in t G N D
C om m on
VOUT = VREF ( 1 +
R2 ) + IADJ R2 R1
Rev. 1.10
4
October 5, 2007
HT1087 Series
* Digitally selected outputs
V
IN
V IN
H T 1 0 8 7 -A D J
ADJ
VOUT R1 125W C2 10mF
V
OUT
C1 10mF R2 R3 R4 R5 Rn
C om m on In p u ts N o te : R 2 c a n s e t th e m a x im u m v o lta g e . S in g le p o in t GND
C om m on
* High output current positive voltage regulator
T r1 V
IN
IC
1
V IN R1 C1 10mF
H T1087 S e r ie s
GND
VOUT IR
EG
V IO C2 10mF
OUT
C om m on
S in g le p o in t G N D V =
1 BE1
C om m on
R
IR IO = IC
EG
+ IR
IC
1 EG
,
(1 + b )
1
* Increased Output voltage Circuit
V
IN
V IN C1 10mF
H T1087 S e r ie s
IS
S
VOUT C2 10mF
V
OUT
GND
V
XX
R1
D1 C om m on S in g le p o in t G N D C om m on
VOUT = VXX + VD1 R1 = VXX ISS
Rev. 1.10
5
October 5, 2007
HT1087 Series
* Dual Supply Circuit
IC 1 V
IN
V IN
H T1087 S e r ie s
GND
VOUT V
OUT1
IC 2 V IN C1 10mF C om m on
V
XX1
C3 10mF
H T1087 S e r ie s
GND
VOUT V C2 10mF R1
OUT2
V
XX2
S in g le p o in t G N D
C om m on
VOUT1 = VXX2 + VXX1 VOUT2 = VXX2
* Tracking Voltage Regulator
V
IN
V IN C1 10mF
H T1087 S e r ie s
GND
VOUT C2 10mF R
A
V
OUT
S in g le p o in t G N D R
B
-V
IN
-V
O
-VO = VOUT x
RA RB
Rev. 1.10
6
October 5, 2007
HT1087 Series
Package Information
3-Pin SOT89 Outline Dimensions
A B
I J
E
C
D
G F H
Symbol A B C D E F G H I J
Dimensions in mil Min. 173 64 90 35 155 14 17 3/4 55 14 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 59 3/4 3/4 Max. 181 72 102 47 167 19 22 3/4 63 17
Rev. 1.10
7
October 5, 2007
HT1087 Series
3-Pin TO92 Outline Dimensions
A
B
D C
E F G H
Symbol A B C D E F G H I a
Dimensions in mil Min. 170 170 500 11 90 45 45 130 8 4 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 200 200 3/4 20 110 55 65 160 18 6
Rev. 1.10
8
October 5, 2007
HT1087 Series
Product Tape and Reel Specifications
Reel Dimensions
T2 D
A
B
C
T1
SOT89 Symbol A B C D T1 T2 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1801.0 621.5 12.75+0.15 1.90.15 12.4+0.2 17-0.4
Rev. 1.10
9
October 5, 2007
HT1087 Series
TO92 Reel Dimensions (Unit: mm)
P ackage U p, 30
F la t S id e U p
P ackage U p,
F la t S id e D o w n
58 88 360
43
Rev. 1.10
10
October 5, 2007
HT1087 Series
Carrier Tape Dimensions
D
E F W C
P0
P1
t
B0
D1
P
K0 A0
SOT89 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 12.0+0.3 -0.1 8.00.1 1.750.1 5.50.05 1.5+0.1 1.5+0.1 4.00.1 2.00.10 4.80.1 4.50.1 1.80.1 0.300.013 9.3
Rev. 1.10
11
October 5, 2007
HT1087 Series
TO92 Carrier Tape Dimensions
P Dh
H1 H H0 l1
W2 W0 t W1 W
F1 P2 P0
F2 D0
TO92 Symbol I1 P P0 P2 F1 F2 Dh W W0 W1 W2 H0 H1 D0 t H Note: Description Taped Lead Length Component Pitch Perforation Pitch Component to Perforation (Length Direction) Lead Spread Lead Spread Component Alignment Carrier Tape Width Hold-down Tape Width Perforation Position Hold-down Tape Position Lead Clinch Height Component Height Perforation Diameter Taped Lead Thickness Component Base Height Dimensions in mm (2.5) 12.71.0 12.70.3 6.350.4 2.5+0.4 -0.1 2.5+0.4 -0.1 00.1 18.0+1.0 -0.5 6.00.5 9.00.5 (0.5) 16.00.5 Less than 24.7 4.00.2 0.70.2 19.00.5
Thickness less than 0.380.05mm~0.5mm P0 Accumulated pitch tolerance: 1mm/20pitches. ( ) Bracketed figures are for consultation only
Rev. 1.10
12
October 5, 2007
HT1087 Series
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 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: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 86-21-6485-5560 Fax: 86-21-6485-0313 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: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 Fax: 86-10-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holmate Semiconductor, Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holmate.com
Copyright O 2007 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes 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. Holteks 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

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