YOBON YB1901SPX8H

YB1901
2.0A High-Side Power Switch with Flag
Description
Features
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.
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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
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Applications
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The YB1901 power switch is available in
SOT-25, MSOP8, SOP8 packages.
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PDA, DSC, GPS
USB Peripherals
PC Cards
PCMCIA Cards
Notebook PC
Battery-Charger Circuits
Battery-Powered Instruments
Typical Application Circuit
2.7~5V
VIN
System
Power
Vout
YB1901
ON
OFF
1u
100K
1u
EN
OCB
Fault
Flag
Figure 1: Typical Application Circuit
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Pin Configuration
OCB
1
GND
2
EN
3
5
VOUT
4
VIN
GND
1
8
VOUT
VIN
2
7
VOUT
VIN
3
6
VOUT
EN
4
5
OCB
SOT23-5
SOP8 or MSOP8
Figure 2: Pin Configuration
Pin Description
Table 1
Name
EN
Description
Pull low to enable the chip, active high (active low is optional).
GND
Ground pin.
OCB
Open-drain fault flag. Connect a 100KΩ resistor 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
Supplied As
YB1901ST25H
Active High
SOT23-5
3000 Units Tape & Reel
Y90H
YB1901SPX8H
Active High
SOP-8
2500 Units Tape & Reel
第一行 Y90H
第二行 SPX8
YB1901MXX8H
Active High
MSOP-8
2500 Units Tape & Reel
Y90HM8
YB1901ST25L
Active Low
SOT23-5
3000 Units Tape & Reel
Y90L
YB1901SPX8L
Active Low
SOP-8
2500 Units Tape & Reel
第一行 Y90L
第二行 SPX8
YB1901MXX8L
Active Low
MSOP-8
2500 Units Tape & Reel
Y90LM8
YB1901 Rev.1.2
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Package Marking
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 (VIN + 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, 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 = 25℃ on a low effective thermal conductivity board.
YB1901 Rev.1.2
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3
YB1901
2.0A High-Side Power Switch with Flag
Electrical Characteristics
Table 3
(VIN=5V, CIN= COUT=1μF, TA=25°C, unless otherwise noted.)
PARAMETER
Input Voltage Rage
Output MOS RDS(ON)
CONDITION
MIN
2.7
YB1901, IOUT=0.5A
TYP
5
MAX
5.5
Unit
V
120
mΩ
60
uA
mA
us
Supply Current
Iout=0
Load current
Output Turn-on Rising Time RL=10Ω, 90% Settling
500
Current Limit Threshold
YB1901, VOUT=4V
1.6
2.2
2.8
A
Short-circuit Current
YB1901, Vout=0V
0.1
1.5
1.73
A
1.5
1.7
200
1.85
2.4
V
mV
uA
uA
V
200
mV
135
20
°C
°C
EN Input Threshold
VIN=5V, Rising
EN Input Hysteresis
Shutdown Supply Current
Output Leakage Current
EN=Non-active, Vout=0V
VIN Under Voltage Lockout
VIN Under Voltage
Hysteresis
Thermal Limit
Thermal Limit Hysteresis
OCB assertion or
OCB Deglitch
deassertion
OCB Output Low Voltage ISINK =1mA, VIN=5V
OCB Off-State Current
VOCB =VIN
YB1901 Rev.1.2
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420
1
1
7.5
10
ms
0.4
1
V
uA
4
YB1901
2.0A High-Side Power Switch with Flag
Typical Characteristics
At TA=25℃, VIN=5V, CIN=COUT=1.0μF, VEN=VIN, unless otherwise noted.
Turn on delay time and rising time
Turn off delay time and falling time
RL=5Ω
Cout=100uF
Inrush current and different load capacitance
RL=5Ω
UVLO at rising
Thermal shutdown reponse
RL=1Ω
Cout=47uF
UVLO at falling
RL=33Ω
YB1901 Rev.1.2
RL=5Ω
Cout=100uF
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RL=33Ω
5
YB1901
2.0A High-Side Power Switch with Flag
Inrush current response
Short circuit response at start up
Cout=47uF
Short circuit and Enable pin enable
Cout=47uF
Resistance load inrush response
Cout=47uF
Capacitance load inrush response
RL=2Ω
Cout=47uF
Capacitance load inrush response
Cout=47uF
CL=470uF hot plug-in
Cout=100uF
CL=10uF hot plug-in
Rdson VS Input Voltage
Quiecsent current VS Input Voltage
160
70
140
120
50
Rdson (mΩ)
Qeiescent Current (uA)
60
40
30
100
80
Iout=100mA
60
20
40
10
20
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
2.5
Input Voltage (V)
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Function Block
VIN
UVLO
Charge
pump
OSC
VOUT
Current
Limit
BIAS
EN
Delay
OCB
Thermal
Protection
GND
Figure 3: Function Block
Functional Description
The YB1901 is an N-channel high-side
power switch with an internal charge-pump
circuitry to drive the switch. The enable
signal is either active high. It is ideal for
battery-powered applications and adaptor
card operation with less than 2.0A
requirement.
NMOS Switch
The drain of the NMOS is connected to VIN
and the source to VOUT. The bulk contact is
grounded, instead of the source terminal,
so there is no parasitic diode between the
two terminals. It prevents reverse current
flow from VOUT to VIN if VOUT being forced to
higher voltage than VIN when the enable is
inactive. This feature makes the main
difference between YB1901 and a
traditional external MOSFET.
YB1901 Rev.1.2
Chip Enable
The enable signal is available with either or
active low of customer’s request. When the
enable is inactive, the switch is turned off,
the internal oscillation stopped, the charge
pump discharged, and the whole chip
current consumption is kept at lower than
0.1μA typically. When the enable is set
active, the oscillation starts, the charge
pump works. But it takes time building up
the control voltage necessary to drive the
MOSFET switch. The turn-on delay time is
around 0.42ms typically.
Floating the enable pin may cause
unpredictable operation. It should be
avoided.
Under-Voltage Lock-Out (UVLO)
UVLO prevents the chip from turning on
until a safe input voltage is reached. For
YB1901 UVLO is set to around 2.4V, and
there is a hysteresis voltage of 0.2V
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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
YB1901 Rev.1.2
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.
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YB1901
2.0A High-Side Power Switch with Flag
Thermal Considerations
The YB1901 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:
than normal traces, and GND should be
connected to a ground plane. For best
performance, CIN and COUT should be
placed close to the package pins.
PD(MAX) = [ TJ(MAX) - TA ] / θJA
Constraints for the YB1901 are maximum
junction temperature TJ(MAX) = 125℃, and
package thermal resistance, θJA =280℃/W.
The maximum continuous output current
for YB1901 depends on package power
dissipation and the RDS(ON) of MOSFET at
TJ(MAX). Typical conditions are calculated
under normal ambient condition where TA =
25℃. At 85℃, PD(MAX) = 143mW. At TA =
25℃, PD(MAX) = 357mW.
The maximum current is calculated by the
following equation:
IOUT < (PD(MAX) / RDS(MAX))1/2
For example, if VIN = 5V, RDS(MAX) = 100mΩ
and TA = 25℃, IOUT(MAX) = 1.89A.
Thermal Shutdown is employed to protect
the device damage when temperature is
over 120℃.
PCB Layout Consideration
To maximize YB1901 performance, some
board layout rules should be followed:
VIN and VOUT should be routed using wider
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Package Information (SOT23-5)
YB1901 Rev.1.2
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10
YB1901
2.0A High-Side Power Switch with Flag
Package Information (MSOP-8)
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Package Information (SOP-8)
NOTICE:
y The information described herein is subject to change without notice.
y Yobon does not assume any responsibility for use of any circuitry or applications described herein, nor
does it convey any patent license.
YB1901 Rev.1.2
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