Negative Voltage Regulator
Features
Low power consumption
·
Low voltage drop
·
Low temperature coefficient
·
Applications
Battery-powered equipment
·
Communication equipment
·
General Description
The HT74XX series is a set of three-terminal
high current high voltage regulator imple
mented in CMOS technology. They can deliver
100mA output current and allow an input volt
age as high as -24V. They are available with
several fixed output voltages ranging from
-2.4V to -15V. CMOS technology ensures low
voltage drop and low quiescent current.
HT74XX
High input voltage (up to -24V)
·
High output current : 100mA (Pd£ 250mW)
·
TO-92 and SOT-89 package
·
Audio/Video equipment
·
Although designed primarily as fixed voltage
regulators, these devices can be used with ex
ternal components to obtain variable voltages
and currents.
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Selection Table
Part No. Output Voltage Tolerance
HT7430
HT7450
-3.0V ±5%
-5.0V ±5%
1 January 26, 2000
Block Diagram Pin Assignment
HT74XX
VIN
GND
ref
VOUT
TO-92
HT74XX
Front View
VOUTGND VIN
Bottom View
Pad Assignment Pad Coordinates
Pad No. X Y
1
2 175.75
(0 ,0 )
1
VOUT
2 3
VIN
GND
3 592.25
-571.75 -578.00
SOT-89
GND VINVOUT
Unit: mm
-545.50
-545.50
Chip size: 1550 ´ 1562 (mm)
2
* The IC substrate should be connected to VDD in the PCB layout artwork.
Absolute Maximum Ratings
Supply Voltage.............................+0.3V to -26V
Power Consumption.............................. 250mW
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi
mum 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 expo
sure to extreme conditions may affect device reliability.
Storage Temperature.................-50°Cto125°C
Operating Temperature ..................0°Cto70°C
2 January 26, 2000
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Electrical Characteristics
HT74XX
HT7430, -3.0V output type
Symbol Parameter
V
OUT
I
OUT
DV
OUT
V
DIF
I
SS
DDV
OUT
´
VV
IN OUT
V
IN
DDV
OUT
T
a
Output Voltage Tolerance
Output Current
Load Regulation
Voltage Drop
Current Consumption
Line Regulation
Input Voltage
Temperature Coefficient
HT7450, -5.0V output type
Symbol Parameter
V
OUT
I
OUT
DV
OUT
V
DIF
I
SS
DDV
OUT
´
VV
IN OUT
V
IN
DDV
OUT
T
a
Output Voltage
Output Current
Load Regulation
Voltage Drop
Current Consumption
Line Regulation
Input Voltage
Temperature Coefficient
Test Conditions
V
IN
-5V
Conditions
=10mA
I
OUT
-5V ¾
-5V 1mA£I
¾
-5V
¾
=1mA
I
OUT
No load
-4V£V
I
=1mA
OUT
OUT
IN
£50mA ¾
£-12V
Min. Typ. Max. Unit
-2.85 -3.0 -3.15
60 100
60 120 mV
100
¾
200 350
¾
0.2
¾
¾¾ ¾¾-24
-5V
0°C<Ta<70°C
¾±0.45 ¾ mV/°C
=10mA
I
OUT
Test Conditions
Min. Typ. Max. Unit
V
IN
-7V
-7V ¾
-7V 1mA£I
¾
-7V
¾
Conditions
=10mA
I
OUT
OUT
=1mA
I
OUT
No load
-6V£V
IN
I
=1mA
OUT
£30mA ¾
£-15V
-4.75 -5.0 -5.25
100 150
60 150 mV
100
¾
330 500
¾
0.2
¾
¾¾ ¾¾-24
I
=10mA
OUT
-7V
0°C<Ta<70°C
¾±0.75 ¾ mV/°C
¾
¾
¾
¾
¾
¾
Ta=25°C
V
mA
mV
mA
%/V
V
Ta=25°C
V
mA
mV
mA
%/V
V
3 January 26, 2000
Application Circuits
Basic circuit
HT74XX
V
V
IN
C1
10
F
m
Common Common
IN
06%"::
GND
High output current positive voltage regulator
Tr1
V
IN
R1
C1
10
m
Common Common
V
IN
06%"::
F
GND
Short-Circuit protection by Tr1
Series
Single point G N D
Series
Single point G N D
V
OUT
C2
10
F
m
V
OUT
C2
10
F
m
V
OUT
V
OUT
R1
Rs
Tr1
V
IN
06%"::
V
OUT
V
OUT
5AHEAI
C1
10
F
m
GND
Single point G N D
C2
10
F
m
V
IN
Common Common
4 January 26, 2000
Circuit for increasing output voltage
HT74XX
V
IN
C1
10
V
IN
F
m
Common CommonSingle point G N D
V=V(1+
OUT XX SS
Circuit for increasing output voltage
C1
V
IN
F
m
V
IN
10
Common Common
06%"::
Series
GND
06%"::
Series
GND
Single point G N D
I
SS
D1
R1
V
OUT
V
OUT
C2
10
F
I
SS
m
V
XX
R2
R2
)+I R2
R1
V
OUT
C2
10
F
m
V
XX
R1
V
OUT
Constant current regulator
V
IN
C1
10
F
m
Common
V=V+V
OUT XX
V
IN
06%"::
D1
V
OUT
Series
GND
I
SS
I=
OUT
C2
V
10mF
V
XX
+I
R
SS
A
5 January 26, 2000
R
XX
A
I
OUT
R
L
Dual supply
IC 1
V
IN
V
IN
06%"::
Series
V
IN
IC 2
06%"::
V
GND
OUT
Series
C1
10
F
m
Common Common
GND
C2
10
F
m
R1
V
OUT
V
OUT
C3
10
F
m
V
OUT
HT74XX
6 January 26, 2000
HT74XX
Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (International sales hotline)
Holtek Semiconductor (Hong Kong) Ltd.
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: 852-2-745-8288
Fax: 852-2-742-8657
Copyright ã 2000 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 hereinare
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 pres
ent a risk to human life due to malfunction or otherwise. 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.
7 January 26, 2000
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