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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 120m. 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 60A 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 m Low Quiescent Current : 60A at 5V Low Shutdown Current : <1A 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
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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 100K 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 Y90H SPX8 Y90HM8 Y90L Y90L 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 .............-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, JA) ...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. JA is measured in free air at TA = 25 on a low effective thermal conductivity board.
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Electrical Characteristics
Table 3 (VIN=5V, CIN= COUT=1F, TA=25C, unless otherwise noted.)
PARAMETER Input Voltage Rage Output MOS RDS(ON)
CONDITION
MIN 2.7
TYP 5 120 60
MAX 5.5
Unit V m uA mA us
YB1901, IOUT=0.5A
Supply Current Iout=0 Load current Output Turn-on Rising Time RL=10, 90% Settling Current Limit Threshold YB1901, VOUT=4V
500 420 1.6 2.2 2.8
A
Short-circuit Current
YB1901, Vout=0V
0.1 1.5
1.5 1.7 200
1.73 1.85 1 1
A V mV uA uA V mV 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
2.4 200 135 20 7.5 10 0.4 1
ms V uA
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Typical Characteristics
At TA=25, VIN=5V, CIN=COUT=1.0F, VEN=VIN, unless otherwise noted.
Turn on delay time and rising time
Turn off delay time and falling time
RL=5 Cout=100uF
RL=5 Cout=100uF
Inrush current and different load capacitance
Thermal shutdown reponse
RL=5
RL=1 Cout=47uF
UVLO at rising
UVLO at falling
RL=33
RL=33
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Inrush current response Short circuit response at start up
Cout=47uF
Cout=47uF
Short circuit and Enable pin enable
Resistance load inrush response
Cout=47uF
RL=2 Cout=47uF
Capacitance load inrush response
Capacitance load inrush response
Cout=47uF CL=470uF hot plug-in
Cout=100uF CL=10uF hot plug-in
Quiecsent current VS Input Voltage
70 60 Qeiescent Current (uA) 50 40 30 20
Rdson VS Input Voltage
160 140 120 Rdson (m) 100 80 60 40
Iout=100mA
10
20
0 2.5 3.0 3.5 4.0 Input Voltage (V) 4.5 5.0 5.5
0 2.5 3.0 3.5 4.0 Input Voltage (V) 4.5 5.0 5.5
YB1901 Rev.1.2
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YB1901
2.0A High-Side Power Switch with Flag
Function Block
VIN
UVLO
Charge pump
OSC BIAS EN
Current Limit
VOUT
Delay Thermal Protection
OCB
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.
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 0.1A 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 Rev.1.2
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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 135C approximately. If the circuit is triggered, the chip will turn on again when the silicon temperature drops around 20C 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 1F 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 0.1F 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 Rev.1.2
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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: PD(MAX) = [ TJ(MAX) - TA ] / JA Constraints for the YB1901 are maximum junction temperature TJ(MAX) = 125, and package thermal resistance, JA =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) = 100m 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 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.
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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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: The information described herein is subject to change without notice. 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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