TK11250C Toko America, TK11250C Datasheet - Page 17

• Manufacturer Part Number: TK11250C
• Description: (TK112xxC) LDO Regulator
• Manufacturer: Toko America

TOKO Inc.
Application hint
Parallel
Current boost
On/Off Cont.
Vin
Because the control current is small, it is possible to control it directly by CMOS logic.
The PULLDOWN resistance (500K ) is built into the control terminal.
The noise and the ripple rejection characteristics depend on the capacitance on the Vref terminal.
The ripple rejection characteristic of the low frequency region improves by increasing the
A standard value is Cnp=0.068 F. Increase Cnp in a design with important output noise and ripple
The on/off switching speed changes depending on the Np terminal capacitance. The switching speed
On/Off Control
can be easily made.
For current boost applications, use the products below. A low voltage drop, high current regulator
TK714xx
TK732xx
circuit following the regulator is non-operating. A design
with little electric power loss can be implemented. We
recommend the use of the on/off control of the regulator
without using a high side switch to provide an output from
the regulator. A highly accurate output voltage with low
voltage drop is obtained.
It is recommended to turn the regulator Off when the
capacitance of Cnp.
rejection requirements. The IC will not be damaged if the capacitor value is increased.
slows when the capacitance is large.
R
connected
( For Iout=10A Max regulator)
Only the PNP transistor for the current boost is external.
resistor.
Built-in Short circuit protection: a constant current can be set by an external
TK11233C
TK11220C
ON/OFF
TK11250C
Control
IC Data Sheet
GC3-H026 A
3.3V
2.0V
5V
The figure at the left illustrates multiple regulators being
controlled by a single On/Off control signal. There is a
possibility of overheating because the power loss of the low
voltage side IC (TK11220C) is large. The series resistor
(R) is put in the input line of the low output voltage
regulator in order to prevent over-dissipation. The voltage
dropped across the resistor reduces the large input-to-
output voltage across the regulator, reducing the power
dissipation in the device. When the thermal sensor works,
a decrease of the output voltage, oscillation, etc.
be observed.
REG
TK112xxC
On/Off Cont.
Page 17
Vsat
OP
may