HT72xx Series
300mA TinyPower
TM
LDO
Features
• Output voltage ranges: Fixed range of 1.8V, 2.5V,
2.7V, 3.0V, 3.3V, 4.5V, 5.0V type.
• Highly accuracy: ±2%
• Low voltage drop: 240mV (typ.),
V
OUT
=5.0V at 300mA
• Maximum Input Voltage: 8V
• Guaranteed output current: 300mA
• Low quiescent current: 4
m
A (typ.)
• Current limiting
• Over-temperature shutdown
• 3-pin SOT23, 5-pin SOT23 and 3-pin SOT89
Packages
General Description
The HT72xx series of positive, linear regulators
features low quiescent current (4
m
A typ.) with low
dropout voltage, making them ideal for battery
applications. The space-saving 3-pin SOT23
package is attractive for ″Pocket″ and ″Hand Held″
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
″Worst″ of operating conditions.
Applications
• Portable electronics
• Wireless devices
• Cordless phones
• PC peripherals
• Battery powered devices
• Electronic scales
Selection Table
Part No.
HT7218
HT7225
HT7227
HT7230
HT7233
HT7245
HT7250
Note: ″xx″ stands for output voltages.
Output Voltage
1.8V
2.5V
2.7V
3.0V
3.3V
4.5V
5.0V
Tolerance
Package
Marking
±2%
SOT23
SOT23-5
SOT89
72xx (for SOT23)
72xx (for SOT23-5)
HT72xx (for SOT89)
Rev. 1.40
1
August 04, 2018
HT72xx
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
V
R 1
V O U T
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
H T 7 2 x x
7 2 x x
T o p V ie w
7 2 x x
T o p V ie w
S O T 8 9
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 O U T
V IN
G N D
C E
G N D
V IN
V O U T
Pin Description
Pin No.
SOT23
—
2
3
1
—
SOT23-5
3
5
1
2
4
SOT89
—
3
2
1
—
Pin Name
CE
VOUT
VIN
GND
NC
Description
Chip enable pin, high enable
Output pin
Input pin
Ground pin
No connection
Rev. 1.40
2
August 04, 2018
HT72xx
Absolute Maximum Ratings*
Maximum Supply Voltage ..........................Up to 8.5V
Operating Temperature .........................−40°C
to 85°C
Storage Temperature ...........................−50°C
to 125°C
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.
Thermal Information
Symbol
θ
JA
Parameter
Thermal Resistance (Junction to Ambient)
(Assume no ambient airflow, no heat sink)
Package
SOT23
SOT23-5
SOT89
SOT23
P
D
Power Dissipation
SOT23-5
SOT89
Max.
667
500
200
0.15
0.20
0.50
Unit
°C/W
°C/W
°C/W
W
W
W
Note: P
D
is measured at Ta= 25°C
Electrical Characteristics
Symbol
V
IN
∆V
OUT
I
SS
∆V
LOAD
V
DROP
∆V
LINE
I
LIM
V
IH
V
IL
I
SD
∆V
OUT
∆T
a
Parameter
Input Voltage
Output Voltage Tolerance
Quiescent Current
Load Regulation (Note1)
Dropout Voltage (Note2)
Line Regulation
Current Limit (Note3)
CE Input High Threshold
CE Input Low Threshold
Shutdown Current
Temperature Coefficient
—
—
I
O
=0mA, V
CE
=V
IN
1mA ≤ I
OUT
≤ 300mA
∆V
OUT
=2%
I
OUT
=300mA
V
O
≤ 1.8V
Test Conditions
T
j=25°
C, V
IN
=V
OUT
+1.0V, I
O
=1mA, unless otherwise specified
Min.
—
−2
—
—
—
—
—
—
300
2
—
—
—
Typ.
—
—
4
0.004
800
350
240
0.2
—
—
—
0.5
±0.8
Max.
8
2
7
0.008
1200
400
300
0.3
—
—
0.8
1.0
—
Unit
V
%
µA
%/mA
mV
2.5V ≤ V
O
≤ 2.7V
3.0V ≤ V
O
≤ 5.0V
V
OUT
+1.0V≤V
IN
≤8.0V
∆V
OUT
=10%
V
OUT
+ 1V ≤ V
IN
≤ 8V
V
OUT
+ 1V ≤ V
IN
≤ 8V
CE input voltage ≤ 0.8V
−40°C < Ta < 85°C
%/V
mA
V
V
µA
mV/°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) / θ
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. 1.40
3
August 04, 2018
HT72xx
Application Circuit
The circuits provided in this section are for reference only.
For the purposes of clarity some of the detailed components pramaters shall depend on the application.
Basic Circuits
V
IN
V IN
0 6 % N N
S e r ie s
G N D
V O U T
V
O U T
C 1
1
m
F
C 2
2 .2
m
F
C o m m o n
V
IN
S in g le p o in t G N D
V IN
C E
C 1
1
m
F
L
H
V O U T
C o m m o n
V
O U T
R2
R1
0 6 % N N
S e r ie s
G N D
C 2
2 .2
m
F
C o m m o n
S in g le p o in t G N D
C o m m o n
Typical Application Circuits
High Output Current Positive Voltage Regulator
T r1
V
IN
I
C
1
V IN
R 1
C 1
1 0
m
F
0 6 % N N
S e r ie s
G N D
V O U T
I
R
E G
V
I
O
C 2
1 0
m
F
O U T
C o m m o n
S in g le p o in t G N D
V
=
1
B E 1
C o m m o n
R
I
R
I
O
= I
C
E G
1
-
+ I
R
I
C
1
E G
,
(1 +
b
)
Rev. 1.40
4
August 04, 2018
HT72xx
Increased Output Voltage Circuit
V
IN
V IN
C 1
1 0
m
F
0 6 % N N
S e r ie s
I
S
S
V O U T
C 2
1 0
m
F
V
O U T
G N D
V
X X
R 1
R 2
C o m m o n
S in g le p o in t G N D
C o m m o n
V
OUT
= V
XX
(1 +
Dual Supply Circuit
R2
R1
) + I
SS
R2
IC 1
V
IN
V IN
0 6 % N N
S e r ie s
G N D
V O U T
C 3
1 0
m
F
V
O U T 1
IC 2
V IN
C 1
1 0
m
F
C o m m o n
V
X X 1
0 6 % N N
S e r ie s
G N D
V O U T
C 2
1 0
m
F
V
R 1
O U T 2
V
X X 2
S in g le p o in t G N D
C o m m o n
V
OUT1
= V
XX2
+ V
XX1
V
OUT2
= V
XX2
Tracking Voltage Regulator
V
IN
V IN
C 1
1 0
m
F
0 6 % N N
S e r ie s
G N D
V O U T
C 2
1 0
m
F
R
A
V
O U T
S in g le p o in t G N D
R
B
-V
IN
V
O
-V
O
= V
OUT
×
R
B
R
A
Rev. 1.40
5
August 04, 2018
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