HT72XX Series
300mA TinyPower
TM
LDO
Features
·
Output voltage ranges: Fixed range of 1.8V, 2.5V,
·
Guaranteed output current: 300mA
·
Low quiescent current: 4mA (typ.)
·
Current limiting
·
Over-temperature shutdown
·
SOT23, SOT23-5, SOT89, TO92 Packages
2.7V, 3.0V, 3.3V, 5.0V type.
·
Highly accuracy:
±2%
·
Low voltage drop: 240mV (typ.),
V
OUT
=5.0V at 300mA
·
Maximum Input Voltage: 8V
Applications
·
Portable electronics
·
Wireless devices
·
Cordless phones
·
PC peripherals
·
Battery powered devices
·
Electronic scales
General Description
The HT72XX series of positive, linear regulators fea-
tures low quiescent current (4mA typ.) with low dropout
voltage, making them ideal for battery applications. The
space-saving SOT23 package is attractive for
²Pocket²
and
²Hand
Held² applications. The devices are capable
of supplying 300mA 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
²Worst²
of operating conditions.
Selection Table
Part No.
HT7218
HT7225
HT7227
HT7230
HT7233
HT7250
Note:
Output Voltage
1.8V
2.5V
2.7V
3.0V
3.3V
5.0V
±2%
SOT23
SOT23-5
SOT89
TO92
72XX# (for SOT23)
72XX# (for SOT23-5)
HT72XX# (for SOT89)
HT72XX (for TO92)
Tolerance
Package
Marking
²XX²
stands for output voltages.
For lead free devices, TO92 package will add a
²#²
mark at the end of the date code, whereas SOT89 &
SOT23, SOT23-5 packages will add a
²#²
mark at the end of the marking.
Rev. 1.20
1
September 30, 2008
HT72XX Series
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
C E
A M P
R 1
V O U T
V
re f
R 2
G N D
Pin Assignment
S O T 2 3
V IN
S O T 2 3 -5
V O U T
N C
S O T 8 9
T O 9 2
H T 7 2 X X
H T 7 2 X X #
T o p V ie w
F r o n t V ie w
7 2 X X #
T o p V ie w
7 2 X X #
T o p V ie w
G N D
G N D
V O U T
V IN
G N D
C E
V IN
V O U T
G N D
V IN
V O U T
B o tto m
G N D
V O U T
V IN
G N D
C E
G N D
V IN
V O U T
V ie w
G N D
V IN
V O U T
Pin Description
Pin No.
SOT23
¾
2
3
1
¾
SOT23-5
3
5
1
2
4
SOT89
¾
3
2
1
¾
TO92
¾
3
2
1
¾
Pin Name
CE
VOUT
VIN
GND
NC
Description
Chip enable pin, high enable
Output pin
Input pin
Ground pin
No connection
Absolute Maximum Ratings*
Maximum Supply Voltage ............................ up to 8.5V
Operating Temperature ..........................-40°C to 85°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 in-
dicate 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 ...........................-50°C to 125°C
Rev. 1.20
2
September 30, 2008
HT72XX Series
Thermal Information
Symbol
Parameter
Thermal Resistance
(Junction to Ambient)
(Assume no ambient airflow,
no heat sink)
Package
SOT23
q
JA
SOT23-5
SOT89
TO92
SOT23
P
D
SOT23-5
Power Dissipation
SOT89
TO92
Note: P
D
is measured at Ta= 25°C
0.50
0.50
W
W
Max.
667
500
200
200
0.15
0.20
Unit
°C/W
°C/W
°C/W
°C/W
W
W
Electrical Characteristics
Symbol
V
IN
DV
OUT
I
SS
DV
LOAD
Parameter
Input Voltage
Output Voltage Tolerance
Quiescent Current
Load Regulation (Note1)
T
j
=25°C, V
IN
=V
OUT
+1.0V, I
O
=1mA, unless otherwise specified
Test Conditions
¾
¾
I
O
=0mA, V
CE
=V
IN
1mA£I
OUT
£300mA
DV
OUT
=2%
I
OUT
=300mA
V
O
£1.8V
2.5V£V
O
£2.7V
3.0V£V
O
£5.0V
Min.
¾
-2
¾
¾
¾
¾
¾
¾
300
2.0
¾
¾
¾
Typ.
¾
¾
4
0.004
800
350
240
0.2
¾
¾
¾
0.5
±0.8
Max.
8
2
7
0.008
1200
400
300
0.3
¾
¾
0.8
1
¾
%/V
mA
V
V
mA
mV/°C
mV
Unit
V
%
mA
%/mA
V
DROP
Dropout Voltage (Note2)
DV
LINE
I
LIM
V
IH
V
IL
I
SD
D
V
O
D
T
a
U T
Line Regulation
Current Limit (Note3)
CE Input High Threshold
CE Input Low Threshold
Shutdown Current
Temperature Coefficient
V
OUT
+1.0V£V
IN
£8.0V
DV
OUT
=10%
V
OUT
+1V£V
IN
£8V
V
OUT
+1V£V
IN
£8V
CE input voltage£0.8V
-40°C<Ta<85°C
Note:
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
P
D
= (T
J(MAX)
-
Ta) /
q
JA
.
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 V
IN
= V
OUT
+1V with a fixed load.
3. Current limit is measured by pulsing for a short time.
Rev. 1.20
3
September 30, 2008
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