HT7521-7 Datasheet, PDF (18/25 Pages) Holtek Semiconductor Inc – 30V, 100mA TinyPowerTM LDO with Protections

HT75xx-7
As the quiescent current of the device is very small it can generally be ignored and as a result the input current can
be assumed to be equal to the output current. Therefore the power dissipation of the device, PD, can be calculated as
the voltage drop across the input and output multiplied by the current, given by the equation, PD = (VIN – VOUT) × IIN.
As the input current is also equal to the load current the power dissipation PD = (VIN – VOUT) × ILOAD. However,
with transient load currents, PD = (VIN – VOUT) × ILOAD(AVG) as shown in the figure.
IIN
VIN
VIN
OUT
VOUT
Common
CE
Vref
Vfb
GND
ILOAD
Common
Application Circuits
Basic Circuits
VIN
C3
0.1μF
C1
10μF ^OFF
VIN
CE
ON
Common
HT75xx-7
Series
GND
VOUT
C2
10μF
V_OUT
C4
0.1μF
Common
High Output Current Positive Voltage Regulator
TR1
VIN
Common
R1
VIN
C3
0.1μF
C1
OFF
10μF
CE
ON
HT75xx-7
Series
GND
VOUT
C2
10μF
VOUT
C4
0.1μF
Common
Rev. 1.10
18
February 18, 2016