HT72Bxx
High PSRR 300mA LDO Regulator
Features
• Output Voltage: 1.5V/1.8V/2.5V/2.8V/
3.0V/3.3V/5V
• High Output Voltage Accuracy: ±2%
• HT72B25 Low Voltage Drop: 0.34V (Typ.)
(V
OUT
=2.5V @ I
OUT
=300mA)
• Maximum Input Voltage: 7.0V
• Guaranteed Output Current: 300mA
• Low Power Consumption: 18uA (Typ.)
• High Ripple Rejection: 70dB (1kHz@I
OUT
=30mA)
• Power-saving Shutdown Mode
• Over Temperature Protection
• Current Limiting
• SOT23-5, SOT89 Package
General Description
The HT72Bxx series are CMOS-based voltage
regulator ICs with high output voltage accuracy, low
quiescent current, low on Resistance, and high ripple
rejection. Each of these ICs consists of a voltage
reference unit, an error amplifier, resistor-net for
voltage setting, a current limit circuit, a chip enable
circuit, and so on.
The HT72Bxx’s current limiters' fold back circuit
also operates as a short circuit protect function for the
output current limiter.
These ICs perform with low dropout voltage and the
chip-enable function. The quiescent current of this IC
is only 18μA, and the line transient response and the
load transient response of HT72Bxx are excellent,
thus these ICs are very suitable for the power supply
for hand-held communication equipment.
The space-saving SOT23-5, SOT89 package will be
an attractive additional feature for pocket and hand-
held applications.
Applications
• Portable communication equipment
• Portable music player
• Electrical appliances such as cameras, VCRs and
camcorders
• Battery-powered equipment
Selection Table
Part No.
HT72B15
HT72B18
HT72B25
HT72B28
HT72B30
HT72B33
HT72B50
Output Voltage
1.5V
1.8V
2.5V
2.8V
3.0V
3.3V
5.0V
±2%
SOT23-5
SOT89
Tolerance
Package
Rev. 1.00
1
August 24, 2011
HT72Bxx
Block Diagram
V
IN
Short Current
Shutdown
V
OUT
CE
V
ref
GND
Absolute Maximum Ratings (Note 1)
Maximum Input Supply Voltage...........................................................................................................................7.5V
Ambient Temperature Range .................................................................................................................. -40°C~+85°C
Thermal Information
Symbol
θ
JA
Parameter
Thermal Resistance
(Junction to Ambient)
(Assume no ambient airflow,
no heat sink)
Power Dissipation
SOT89
Note: P
D
is measured at Ta= 25°C
0.50
W
Package
SOT23-5
SOT89
SOT23-5
P
D
Max.
500
200
0.20
Unit
°C/W
°C/W
W
Rev. 1.00
2
August 24, 2011
HT72Bxx
Electrical Characteristics
Symbol
V
IN
∆V
OUT
∆V
LINE
∆V
LOAD
Parameter
Input Voltage
Output Voltage Tolerance
Line Regulation
Load Regulation(Note 3)
Ta=25°C, V
IN
=V
OUT
+1V, I
OUT
=30mA, unless otherwise specified(Note 2)
Test Conditions
1.5V≤V
OUT
≤5.0V
1mA≤I
OUT
≤30mA
V
OUT
+0.5V≤V
IN
≤7V I
OUT
=10mA
1.5V≤V
OUT
≤1.8V
1mA≤I
OUT
≤300mA 2.5V≤V
OUT
≤3.0V
V
OUT
≥3.3V
∆V
OUT
=2%
I
OUT
=300mA
V
OUT
=0V
I
OUT
=0mA
CE=GND
V
OUT
+1V≤V
IN
≤7V
V
OUT
+1V≤V
IN
≤7V
I
OUT
=30mA
f=1kHz
f=10kHz
1.5V≤V
OUT
≤1.8V
2.5V≤V
OUT
≤5.0V
Min.
2.5
-2
—
—
—
—
—
—
—
—
—
1
0
—
—
—
—
—
Typ. Max.
—
—
0.02
13
14
15
0.6
0.34
90
18
0.1
—
—
70
53
30
±100
150
7
+2
0.1
30
35
40
0.9
0.64
—
30
1
7
0.3
—
—
—
—
—
V
mA
μA
μA
V
V
dB
μVrms
ppm/°C
°C
mV
Unit
V
%
%/V
V
DROP
I
SHORT
I
SS
I
SD
V
IH
V
IL
RR
V
NOISE
T
C
T
SD
Dropout Voltage(Note 4)
Short Current Limit
Supply Current
Shutdown Current
CE Input High Threshold
CE Input Low Threshold
Ripple Rejection
Output Noise
Temperature Coefficient
Thermal Shutdown Temperature
Bandwidth=10Hz to 100KHz
T
C
=
∆
V
OUT
, I
=30mA, -40°C≤Ta≤85°C
∆
T
a
•
V
OUT
OUT
—
Note: 1. 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.
2. Specifications are production tested at T
A
=room temperature. Specifications over the -40°C to 85°C
operating temperature range are assured by design, characterization and correlation with Statistical
Quality Controls (SQC).
3. Load regulation is measured at constant junction temperature, using pulse testing with a short ON time.
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)
–T
A
)/θ
JA
.
4. Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a
specified output current. In dropout, the output voltage will be equal to: V
IN
–V
DROP
.
Rev. 1.00
4
August 24, 2011
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