RT9721A RICHTEK [Richtek Technology Corporation], RT9721A Datasheet
RT9721A
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RT9721A Summary of contents
Page 1
... The RT9721A/B are low voltage, single N-MOSFET high- side power switches, optimized for self-powered and bus- powered Universal Serial Bus (USB) applications. The RT9721A/B series provides a charge pump circuitry to drive the internal MOSFET switch; the switch's low R 80mΩ, meets USB voltage drop requirements; and a flag output is available to indicate fault conditions to the local USB controller ...
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... Open-Drain Fault Flag Output. FLG 5 VOUT Switch Output Voltage. Function Block Diagram EN Bias Oscillator www.richtek.com 2 Pull-Up Resistor (10k to 100k) USB Controller 1 4 Over -Current VIN FLG C IN RT9721A/B 1µF 5 VOUT OUT GND 10µF 2 Ferrite Beads Pin Function Current UVLO Limiting Gate Charge Control ...
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... LEAKAGE EN LOAD T 10 ON_RISE I LIM_THRES I Rising OUT HOLD LIM OUT I = 1mA R SINK FLG FLG_OFF FLG From fault condition to FLG t D assertion Discharge EN RT9721A/B Min Typ -- 80 = Open -- 50 = Open -- 0 0.01 = 0Ω -- 0.5 Rising -- 200 OUT -- -- 500 -- -- 100 − ...
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... RT9721A/B Parameter Under-Voltage Lockout Under-Voltage Hysteresis Thermal Shutdown Protection Thermal Shutdown Hysteresis Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied ...
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... Input Voltage (V) Switch Off Supply Current vs. Input Voltage 0.30 0.25 0.20 0.15 0.10 0.05 0.00 2.5 3 3.5 Input Voltage (V) DS9721A/B-02 April 2011 I = 100mA OUT 4 4.5 5 5.5 No Load 4 4.5 5 5.5 No Load 4 4.5 5 5.5 RT9721A/B On Resistance vs. Temperature 150 V IN 130 110 -50 - Temperature Switch On Supply Current vs. Temperature 45.0 42.5 40.0 37.5 35.0 32.5 30.0 27.5 25.0 -50 - Tmeperature Switch Off Supply Current vs. Temperature ...
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... RT9721A/B Output Voltage vs. Output Current 100 200 300 400 500 600 700 800 900 100 Output Current (mA) Output Turn-On Rise Time vs. Input Voltage 220 No Load 200 180 160 140 120 100 80 2.5 3 3.5 Input Voltage (V) Current Limit Detect Threshold vs. Input Voltage ...
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... Input Voltage (V) DS9721A/B-02 April 2011 − OUT 4 4 0Ω LOAD 4 4.5 5 5.5 Rising (2V/Div) Falling V (2V/Div) 4 4.5 5 5.5 RT9721A/B Current Limit vs. Temperature 900 850 800 750 700 650 600 550 500 -50 - Temperature FLAG Delay Time vs. Temperature 14.0 13.5 13.0 12.5 12.0 11.5 11.0 10.5 10.0 -50 - ...
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... RT9721A/B Power Off from (2V/Div) V OUT (2V/Div) Time (2ms/Div) Turn Off from (5V/Div) V OUT (2V/Div (500mA/Div) Time (100μs/Div) FLAG Response V OUT (5V/Div) V FLG (5V/Div) I OUT (500mA/Div) Time (2ms/Div) www.richtek.com (5V/Div) V (2V/Div (500mA/Div 200Ω ...
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... MOSFET are turned off, reducing the supply current to 0.1μA typical. The maximum guaranteed voltage for a logic low at the EN pin is 0.8V. A minimum guaranteed voltage the EN pin will turn the RT9721A/B on. Floating the input may cause unpredictable operation. EN should not be allowed to go negative with respect to GND. ...
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... USB-required fault reporting. The faster trip time of the RT9721A/B power distribution allow designers to design hubs that can operate through faults. The RT9721A/B have low on-resistance and internal fault-reporting circuitry that help the designer to meet voltage regulation and fault notification requirements ...
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... Figure 1. Maximum Power Dissipation Derating Curve RT9721A/B − θ J(MAX the maximum operation junction J(MAX) is the ambient temperature and the θ 250°C/W on the standard JEDEC 51-3 single layer = (125°C - 25°C) / (250°C/W) = 0.4W for J(MAX) . For the RT9721A/B, Figure 1 shows the maximum 0.50 0.45 0.40 0.35 SOT-23-5 0.30 0.25 0.20 0.15 0.10 0.05 0. Ambient Temperature (° ...
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... RT9721A/B Layout Considerations For best performance of the RT9721A/B series, the following guidelines must be strictly followed. Input and output capacitors should be placed close to the IC and connected to ground plane to reduce noise coupling. The GND should be connected to a strong ground plane for heat sink. ...
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... SOT-23-5 Surface Mount Package Richtek Technology Corporation Taipei Office (Marketing) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com RT9721A Dimensions In Inches Min Max 0.035 0.051 0.000 0.006 0.055 0.071 ...