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 R
DS(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 R
DS(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
100K
1u
EN
OCB
Fault
Flag
YB1901
ON
OFF
1u
Figure 1: Typical Application Circuit
YB1901 Rev.1.2
www.yobon.com.tw
1
YB1901
2.0A High-Side Power Switch with Flag
Pin Configuration
GND
VIN
VIN
OCB
GND
EN
1
2
3
SOT23-5
5
4
VOUT
1
2
3
4
SOP8 or MSOP8
8
7
6
5
VOUT
VOUT
VOUT
OCB
VIN
EN
Figure 2: Pin Configuration
Pin Description
Table 1
Name
EN
GND
OCB
VIN
VOUT
Description
Pull low to enable the chip, active high (active low is optional).
Ground pin.
Open-drain fault flag. Connect a 100KΩ resistor to VIN.
Input supply. Bypass with a capacitor to GND.
Output voltage. Bypass with a capacitor to GND.
Ordering Information
Table 2
Order Number
YB1901ST25H
YB1901SPX8H
YB1901MXX8H
YB1901ST25L
YB1901SPX8L
YB1901MXX8L
Enable
Active High
Active High
Active High
Active Low
Active Low
Active Low
Package Type
SOT23-5
SOP-8
MSOP-8
SOT23-5
SOP-8
MSOP-8
Supplied As
3000 Units Tape & Reel
2500 Units Tape & Reel
2500 Units Tape & Reel
3000 Units Tape & Reel
2500 Units Tape & Reel
2500 Units Tape & Reel
Package Marking
Y90H
第一行
Y90H
第二行
SPX8
Y90HM8
Y90L
第一行
Y90L
第二行
SPX8
Y90LM8
YB1901 Rev.1.2
www.yobon.com.tw
2
YB1901
2.0A High-Side Power Switch with Flag
Absolute Maximum Ratings
(Note 1)
Supply Voltage...............................-0.3V to 6
Output Voltage .............. -0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration..............Infinite
Junction Temperature ..........................150℃
Storage Temperature .............-65℃ to 150℃
Lead Temperature................................250℃
ESD Susceptibility (HBM) .................... 3KV
ESD Susceptibility (MM) .......................300V
Recommended Operating Conditions
(Note 2)
Input Supply Voltage ...............2.7V to 5.5V
Operating Temperature ......... -40℃ to 85℃
Thermal Information
(Note 3)
Thermal Resistance (SOT-25,
θ
JA
) ...280℃/W
Internal Power Dissipation (SOT-25, P
D
) .. 0.4W
Note:
1. Exceeding these ratings may damage the device.
2. The device is not guaranteed to function outside of its operating conditions.
3.
θ
JA
is measured in free air at T
A
= 25℃ on a low effective thermal conductivity board.
YB1901 Rev.1.2
www.yobon.com.tw
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