HT74XX
Negative Voltage Regulator
Selection Table
Part No.
Output Voltage
Tolerance
HT7430
-3.0V
5%
HT7450
-5.0V
5%
1
January 26, 2000
Features
Low power consumption
Low voltage drop
Low temperature coefficient
High input voltage (up to -24V)
High output current : 100mA (P
d
250mW)
TO-92 and SOT-89 package
Applications
Battery-powered equipment
Communication equipment
Audio/Video 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.
Although designed primarily as fixed voltage
regulators, these devices can be used with ex-
ternal components to obtain variable voltages
and currents.
Block Diagram
Pin Assignment
Pad Assignment
Pad Coordinates
Unit: mm
Pad No.
X
Y
1
-571.75
-578.00
2
175.75
-545.50
3
592.25
-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
Storage Temperature.................-50C to 125C
Power Consumption.............................. 250mW
Operating Temperature ..................0C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maxi-
mum 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 expo-
sure to extreme conditions may affect device reliability.
HT74XX
2
January 26, 2000
VOUT
VIN
ref
GND
VOUT
GND VIN
HT74XX
TO-92
GND VIN
VOUT
SOT-89
Front View
Bottom View
1
2
3
( 0 , 0 )
VO
U
T
VI
N
GN
D
Electrical Characteristics
HT7430, -3.0V output type
Ta=25C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
IN
Conditions
V
OUT
Output Voltage Tolerance -5V I
OUT
=10mA
-2.85 -3.0 -3.15
V
I
OUT
Output Current
-5V
60
100
mA
DV
OUT
Load Regulation
-5V 1mAI
OUT
50mA
60
120
mV
V
DIF
Voltage Drop
I
OUT
=1mA
100
mV
I
SS
Current Consumption
-5V No load
200
350
mA
D
D
V
V
V
OUT
IN
OUT
Line Regulation
-4VV
IN
-12V
I
OUT
=1mA
0.2
%/V
V
IN
Input Voltage
-24
V
D
D
V
T
OUT
a
Temperature Coefficient
-5V I
OUT
=10mA
0C<Ta<70C
0.45
mV/C
HT7450, -5.0V output type
Ta=25C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
IN
Conditions
V
OUT
Output Voltage
-7V I
OUT
=10mA
-4.75 -5.0 -5.25
V
I
OUT
Output Current
-7V
100
150
mA
DV
OUT
Load Regulation
-7V 1mAI
OUT
30mA
60
150
mV
V
DIF
Voltage Drop
I
OUT
=1mA
100
mV
I
SS
Current Consumption
-7V No load
330
500
mA
D
D
V
V
V
OUT
IN
OUT
Line Regulation
-6VV
IN
-15V
I
OUT
=1mA
0.2
%/V
V
IN
Input Voltage
-24
V
D
D
V
T
OUT
a
Temperature Coefficient
-7V I
OUT
=10mA
0C<Ta<70C
0.75
mV/C
HT74XX
3
January 26, 2000
Application Circuits
Basic circuit
High output current positive voltage regulator
Short-Circuit protection by Tr1
HT74XX
4
January 26, 2000
C o m m o n
C o m m o n
S i n g l e p o i n t G N D
G N D
T r 1
R 1
0 6 % " : :
S e r i e s
C 2
1 0 m F
C 1
1 0 m F
V
I N
V
O U T
V
O U T
V
I N
0 6 % " : :
S e r i e s
C 2
1 0 m F
C o m m o n
C o m m o n
S i n g l e p o i n t G N D
G N D
V
O U T
V
I N
V
I N
V
O U T
C 1
1 0 m F
C o m m o n
C o m m o n
S i n g l e p o i n t G N D
G N D
T r 1
R s
R 1
0 6 % " : :
5 A H E A I
C 1
1 0 m F
V
O U T
V
I N
C 2
1 0 m F
V
O U T
V
I N
Circuit for increasing output voltage
V
= V
( 1 + R2
R1
) + I R2
OUT
XX
SS
Circuit for increasing output voltage
V
= V
+ V
OUT
XX
D1
Constant current regulator
I
= V
R
+ I
OUT
XX
A
SS
HT74XX
5
January 26, 2000
C o m m o n
C o m m o n
S i n g l e p o i n t G N D
G N D
D 1
R 1
0 6 % " : :
S e r i e s
C 2
1 0 m F
V
I N
V
O U T
V
O U T
V
I N
V
X X
I
S S
C 1
1 0 m F
C o m m o n
C o m m o n
S i n g l e p o i n t G N D
G N D
R 1
R 2
0 6 % " : :
S e r i e s
C 1
1 0 m F
V
I N
V
X X
V
O U T
V
O U T
I
S S
V
I N
C 2
1 0 m F
C o m m o n
G N D
0 6 % " : :
S e r i e s
C 1
1 0 m F
C 2
1 0 m F
I
S S
V
I N
V
I N
V
O U T
V
X X
I
O U T
R
A
R
L
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