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HT78XX Series 500mA TinyPowerTM LDO
Features
* Output voltage ranges: Fixed range of 1.8V, 2.5V, * Low quiescent current: 5mA (typ.) * Current limiting * Over-temperature shutdown * SOT-89, TO-92 Packages
2.7V, 3.0V, 3.3V, 5.0V type.
* Highly accuracy: 2% * Low voltage drop: 360mV (typ.),
VOUT=5.0V at 500mA
* Guaranteed output current: 500mA
Applications
* Battery powered systems * Personal Digital Assistants * Peripheral cards * PCMCIA cards * Personal Communication Equipment
General Description
The HT78XX series of positive, linear regulators features low quiescent current (5mA typ.) with low dropout voltage, making them ideal for battery applications. The devices are capable of supplying 500mA of output current continuously. They are available with several fixed output voltages ranging from 1.8V to 5.0V. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain variable voltages and currents. These rugged devices have Thermal Shutdown and Current Limiting to prevent device failure under the Worst of operating conditions.
Selection Table
Part No. HT7818 HT7825 HT7827 HT7830 HT7833 HT7850 Output Voltage 1.8V 2.5V 2.7V 3.0V 3.3V 5.0V 2% SOT-89 TO-92 Tolerance Package
Block Diagram
V IN O v e rc u rre n t S h u td o w n T h e rm a l S h u td o w n R1 AMP VOUT
V
re f
R2 GND
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HT78XX Series
Pin Assignment
S O T -8 9 T O -9 2
H T78XX H T78XX T o p V ie w
F r o n t V ie w
GND
V IN
VOUT GND V IN VOUT
B o tto m
GND V IN VOUT GND V IN VOUT
V ie w
N o te : F o r le a d fr e e d e v ic e s , a # m a r k is s u ffix e d a t th e e n d o f th e d a te c o d e .
Absolute Maximum Ratings*
Maximum Supply Voltage ............................ up to 8.5V Operating Temperature ......................... -40C to 85C 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. Storage Temperature .......................... -50C to 125C
Thermal Information
Symbol Parameter Thermal Resistance (Junction to Ambient) (Assume no ambient airflow, no heat sink) Power Dissipation TO-92 0.50 W Package SOT-89 TO-92 SOT-89 Max. 200 200 0.50 Unit C/W C/W W
qJA
PD
Note: PD is measured at Ta= 25C
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HT78XX Series
Electrical Characteristics
Symbol VIN DVOUT ISS DVLOAD VDROP DVLINE ILIM
DVO DT
a UT
Tj=25C, VIN=VOUT+1.0V, IO=1mA, unless otherwise specified Test Conditions 3/4 3/4 IO=0mA 1mAIOUT500mA DVOUT=2% IOUT=500mA VO1.8V 2.5VVO2.7V 3.0VVO5.0V Min. 3/4 -2 3/4 3/4 3/4 3/4 3/4 3/4 500 3/4 Typ. 3/4 3/4 5 0.004 800 500 360 0.2 3/4 0.8 Max. 8 2 7 0.008 1200 650 500 0.3 3/4 3/4 %/V mA mV/C mV Unit V % mA %/mA
Parameter Input Voltage Output Voltage Tolerance Quiescent Current Load Regulation (Note1)
Dropout Voltage (Note2)
Line Regulation Current Limit (Note3) Temperature Coefficient
VOUT+1.0VVIN8.0V DVOUT=10% -40CNote:
1. 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. 2. 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+1V with a fixed load. 3. Current limit is measured by pulsing for a short time.
Application Circuits
Basic Circuits
V
IN
V IN
H T78XX S e r ie s
GND
VOUT
V
OUT
C1 1mF
C2 2 .2 m F
C om m on
S in g le p o in t G N D
C om m on
Typical Application Circuits
* High output current positive voltage regulator
T r1 V
IN
IC
1
V IN R1 C1 10mF
H T78XX 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
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HT78XX Series
* Increased Output voltage Circuit
V
IN
V IN C1 10mF
H T78XX S e r ie s
IS
S
VOUT C2 10mF
V
OUT
GND
V
XX
R1
R2
C om m on
S in g le p o in t G N D
C om m on
VOUT = VXX (1+
* Dual Supply Circuit
R2 ) + ISS R2 R1
IC 1 V
IN
V IN
H T78XX S e r ie s
GND
VOUT V
OUT1
IC 2 V IN C1 10mF C om m on
V
XX1
C3 10mF
H T78XX 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 T78XX 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 = VO x
RA RB
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HT78XX Series
Package Information
3-Pin SOT-89 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
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HT78XX Series
3-Pin TO-92 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
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Product Tape and Reel Specifications
Reel Dimensions
T2 D
A
B
C
T1
SOT-89 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
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HT78XX Series
TO-92 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
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HT78XX Series
Carrier Tape Dimensions
D
E F W C
P0
P1
t
B0
D1
P
K0 A0
SOT-89 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
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HT78XX Series
TO-92 Carrier Tape Dimensions
P Dh
H1 H H0 l1
W2 W0 t W1 W
F1 P2 P0
F2 D0
TO-92 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
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HT78XX 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 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.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.
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