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YB1901 Datasheet(PDF) 7 Page - YOBON TECHNOLOGIES,INC. |
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YB1901 Datasheet(HTML) 7 Page - YOBON TECHNOLOGIES,INC. |
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7 / 12 page  YB1901 2.0A High-Side Power Switch with Flag YB1901 Rev.1.2 www.yobon.com.tw 7 Function Block 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 0.1μA 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 UVLO BIAS OSC Charge pump Current Limit Thermal Protection Delay VIN VOUT OCB EN GND |
Similar Part No. - YB1901 |
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Similar Description - YB1901 |
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