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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
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Pin Configuration
YB1901
2.0A High-Side Power Switch with Flag
OCB 1
GND 2
EN 3
SOT23-5
5 VOUT GND 1
VIN 2
4 VIN
VIN 3
EN 4
8 VOUT
7 VOUT
6 VOUT
5 OCB
SOP8 or MSOP8
Figure 2: Pin Configuration
Pin Description
Table 1
Name
Description
EN Pull low to enable the chip, active high (active low is optional).
GND
Ground pin.
OCB
Open-drain fault flag. Connect a 100Kresistor to VIN.
VIN Input supply. Bypass with a capacitor to GND.
VOUT
Output voltage. Bypass with a capacitor to GND.
Ordering Information
Table 2
Order Number Enable
Package Type
YB1901ST25H Active High
SOT23-5
YB1901SPX8H Active High
SOP-8
YB1901MXX8H
YB1901ST25L
Active High
Active Low
MSOP-8
SOT23-5
YB1901SPX8L Active Low
SOP-8
YB1901MXX8L Active Low
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
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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 (VIN + 0.3V)
Output Short-Circuit Duration..............Infinite
Junction Temperature ..........................150
Storage Temperature .............-65to 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 ......... -40to 85
Thermal Information
(Note 3)
Thermal Resistance (SOT-25, θJA) ...280/W
Internal Power Dissipation (SOT-25, PD) .. 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. θJA is measured in free air at TA = 25on a low effective thermal conductivity board.
YB1901 Rev.1.2
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