YB1900 Datasheet, PDF (6/8 Pages) YOBON TECHNOLOGIES,INC. – Ultra Low Quiescent Current Smart Load Switch

Function Block
YB1900
Ultra Low Quiescent Current Smart Load Switch
Application Information
The YB1900 featured very low quiescent
current and very low RDS(ON) and making
them ideal for battery-powered applications.
The ENABLE control pin is TTL compatible
and driven by 1.5V beyond making the
YB1900 an ideal level-shifting load switch.
Input Capacitor Selection
A 1μF or larger input capacitor is
recommended to prevent load transients
from affecting upstream circuits. CIN should
be located as close to the device VIN pin as
practically. There is no specific requirement
type of capacitor is recommended. However,
for higher current operation, ceramic
capacitors are recommended for CIN.
Output Capacitor Selection
For proper slew operation, a 0.1μF or greater
is recommended. The output capacitor has
also no specific capacitor type requirement.
If desired, COUT maybe increased without
limit to accommodate any load transient
Reverse Output-to-Input Voltage
Conditions and Protection
Under normal conditions, there is a parasitic
diode between the output & input of the load
switch. In case of VOUT exceeding VIN, this
would forward bias the internal parasitic
diode and allow excessive current flow into
the VOUT pin and possibly damage the load
switch.
In applications, where there is a possibility of
VOUT exceeding VIN for brief periods of time
during operation, the use of larger value CIN
capacitor is highly recommended. A larger
value of CIN with respect to COUT will affect a
slower CIN decay rate during shutdown, thus
preventing VOUT from exceeding VIN.
In case of extended period of time for VOUT
exceeding VIN, it is recommended to place a
Schottky diode from VIN to VOUT.
Thermal Considerations
The YB1900 is designed to deliver a
continuous load current. The maximum limit
is package power dissipation. At any given
ambient temperature, the maximum package
power dissipation can be determined by the
following equation:
P_D(MAX) = [T_J(MAX)-T_A] / θ_JA
YB1900 MRev.1.2
www.yobon.com.tw
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