RT9173B Richtek Technology Corporation, RT9173B Datasheet
RT9173B
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RT9173B Summary of contents
Page 1
... Current limits in both sourcing and sinking mode, plus on- chip thermal shutdown make the circuit tolerant of the output fault conditions. The RT9173B are available in the popular 5-lead TO-252 and fused SOP-8 (the multiple V package are internally connected but lowest thermal resistance) surface mount packages. ...
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... REFEN 2N7002 GND 50Ω / 33Ω / 25Ω 47μF CNTL 3.3V 2.5V VCNTL VIN RT9173B 1.25V REFEN VOUT GND Figure 1. Output Voltage Tolerance, ΔV 3.3V A VCNTL VIN RT9173B REFEN VOUT GND R L Figure 2. Current in Shutdown Mode, Ι 2. VOUT C OUT R DUMMY V OUT V C ...
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... V OUT V would be high if V OUT R and C L OUT Time deleay Figure 5. REFEN Pin Shutdown Threshold OUT OUT I L CLHIGH OUT V C OUT CLLOW 2.5V VIN V OUT VOUT OUT L < 0.2V REFEN > 0.6V REFEN TRIGGER RT9173B www.richtek.com 3 ...
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... RT9173B Functional Pin Description Pin Name VIN Power Input GND Ground VCNTL Gate Drive Voltage REFEN Reference Voltage Input and Chip Enable VOUT Output Voltage Function Block Diagram REFEN www.richtek.com 4 Pin Function VCNTL Current Limiting Sensor CNTL Thermal VIN VOUT GND ...
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... CNTL < 0.2V 180Ω, Figure 2 SHDN REFEN L I Figure 3,4 LIM 3.3V ≤ V ≤ CNTL ΔT 3.3V ≤ V ≤ CNTL Output = High, Figure 5 Output = Low, Figure 5 RT9173B –65°C to 150°C Min Typ Max Units − − 1.7 2.5/1 3.3 ...
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... RT9173B Note 1. Stresses beyond those listed under These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ...
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... CNTL V = 2.5V CNTL 110 125 V = 2.5V CNTL V = 2.5V 3.3V IN CNTL 110 125 (°C) RT9173B Source Current Limit vs. Temperature 3.8 3 1.8V 2 2.5V 2.2 1.8 -40 -25 - Temperature (°C) Sink Current Limit vs. Temperature 3.8 3 1.8V 3.3V IN CNTL 2 ...
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... RT9173B Output Voltage vs. Temperature 0. 1. 3.3V CNTL 0.905 0.9 0.895 0.89 -40 -25 - Temperature (°C) 0. Transient Response 0.9V REFEN 100 Swing Frequency : 1kHz 0 -100 Time (250us/Div) 1.25V @ 2A Transient Response 1.25V REFEN 100 Swing Frequency : 1kHz 0 -100 Time (250us/Div) www.richtek.com 8 50 ...
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... Output Short-Circuit Protection Source Force the output shorted to ground Time (1ms/DIV) DS9173B-09 March 2007 3.3V CNTL RT9173B Output Short-Circuit Protection Sink CNTL Force the output shorted to V Time (1ms/DIV) www.richtek.com = 2.5V = 3.3V DDQ 9 ...
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... Distributed Bus Terminating Topology Terminator Resistor VOUT RT9173B REFEN VOUT RT9173B General Regulator The RT9173B could also serves as a general linear regulator. The RT9173B accepts an external reference voltage at REFEN pin and provides output voltage regulated to this reference voltage as shown in Figure 6, where R1/(R1+R2) OUT REF www ...
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... Input Capacitor and Layout Consideration Place the input bypass capacitor as close as possible to the RT9173B. A low ESR capacitor larger than 470uF is recommended for the input capacitor. Use short and wide traces to minimize parasitic resistance and inductance. Inappropriate layout may result in large parasitic inductance and cause undesired oscillation between RT9173B and the preceding power converter ...
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... RT9173B Outline Information Symbol www.richtek.com Dimensions In Millimeters Min Max 2.184 2.388 0.381 0.889 4.953 5.461 0.457 0.889 5.334 6.223 6.350 6.731 9.000 10.414 0.508 1.780 0.508 Ref. 0.889 2.032 1 ...
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... SOP Plastic Package Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com RT9173B H M Dimensions In Inches Min Max 0.189 0.197 0.150 0.157 0.053 ...