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PDF ( 数据手册 , 数据表 ) YB1901

零件编号 YB1901
描述 2.0A High-Side Power Switch
制造商 YOBON TECHNOLOGIES
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YB1901 数据手册, 描述, 功能
YB1901
2.0A High-Side Power Switch with Flag
Description
The YB1901 is a low operation voltage,
single N-channel MOSFET high-side
power switch, optimized for low power
consumption system. A small internal
charge-pump circuitry is built in the
YB1901 to drive the internal MOSFET
switch for reaching an average RDS(ON)
resistance of 120mΩ. A fault flag output is
available to indicate an abnormal condition
during operation.
Some other features include low in-rush
current during plug-in, thermal shutdown to
prevent switch failure from high-current
loads, under-voltage lock-out to keep the
chip off when below normal operation
supply, a short-circuit protection to avoid
grounded big current. The quiescent
current needed to run the change-pump is
as low as 60μA at 5V input. It makes the
device ideal for portable battery operated
system.
The YB1901 power switch is available in
SOT-25, MSOP8, SOP8 packages.
Features
„ Built-In N-Channel MOSFET
„ Typical RDS(ON) Resistance : 120 mΩ
„ Low Quiescent Current : 60μA at 5V
„ Low Shutdown Current : <1μA
„ Current Limit at 2.0A
„ Wide Input Voltage Range : 2.7 ~ 5.5V
„ Hot Plug-In Application
„ 2.4V Under-Voltage Lock-Out
„ Thermal Shutdown Protection
„ Short-Circuit Protection
„ Reverse Current Flow Blocking
„ Open-Drain Fault Flag
„ SOT-25, MSOP8, SOP8 Packages
„ Green Package (RoHS) Available
Applications
„ PDA, DSC, GPS
„ USB Peripherals
„ PC Cards
„ PCMCIA Cards
„ Notebook PC
„ Battery-Charger Circuits
„ Battery-Powered Instruments
Typical Application Circuit
2.7~5V
VIN Vout
System
Power
ON
OFF
1u
YB1901
100K
1u
EN OCB
Fault
Flag
YB1901 Rev.1.2
Figure 1: Typical Application Circuit
www.yobon.com.tw
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YB1901 pdf, 数据表
YB1901
2.0A High-Side Power Switch with Flag
between rising and falling. That UVLO
shuts down the chip when input voltage
drops below 2.4V and allows starting up
the chip when input voltage above 2.6V.
Short-Circuit Protection
If the VOUT pin is connected to ground or
nearly ground level by mistake, the
short-circuit protection circuit will come
active and put a current limit over the
switch to protect the switch from
over-current. The current limit is set around
1.5A.
Overload Current Limit
The YB1901 is designed to work below
2.0A. If the current load outgrows 2.0A, it
will trigger the Overload Current Limit
Circuitry. The max current limit is set at
2.0A. If the protection circuit is activated, it
send out a fault signal from the OCB pin. It
does not shutdown the circuit.
Thermal Shutdown
The thermal shutdown is deployed to
protect the switch from damage if the
silicon temperature rises above 135°C
approximately. If the circuit is triggered, the
chip will turn on again when the silicon
temperature drops around 20°C below.
Fault Flag
There is a fault flag signal (OCB) available
with YB1901 to indicate the occurrence of
abnormal operation. The abnormal
operation includes Short-Circuit, Thermal
shutdown and Overload Current Limit.
When the fault happens and lasts for more
than 7.5ms typically, the flag will be
asserted. OCB is designed in open-drain
structure. Connecting a resistor of 100K
ohm to VIN is necessary for the pin to signal
(active low) a faulty condition.
Application Information
The YB1901 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 1.7V beyond making the
YB1901 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 no
parasitic diode between the output & input
of the load switch. In case of VOUT
exceeding VIN, there is no excessive
current flow from VOUT to VIN. This
reverse-blocking ability secures the use of
such a power switch.
YB1901 Rev.1.2
www.yobon.com.tw
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