rt9237 ETC-unknow, rt9237 Datasheet
rt9237
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rt9237 Summary of contents
Page 1
... The settings of current sense, droop tuning and over current protection are independent to compensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The RT9237 uses a 5-bit DAC of 1.1V to 1.85V (25mV/step) output with load compensation to meet the strict VRM transient requirement ...
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... RT9237 Absolute Maximum Ratings Supply Voltage Input, Output or I/O Voltage Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Power Dissipation SOP-28 Package Thermal Resistance SOP-28, θ JA Lead Temperature (Soldering, 10 sec.) Electrical Characteristics (V = 5V, GND = 0V 25°C, unless otherwise specified) ...
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... R = 15k IMAX VSEN Rising VSEN Rising IMAX Oscillator INH OVP, PGOOD POR Logic Current Limit Droop Processor Control EA SS Control COMP SS RT9237 Min Typ Max 0.55 0.6 0. 116 120 124 -- 108 -- 92 IRMP INH PWM Logic & Driver PWMCP INH PWM Logic & Driver ...
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... RT9237 VID4 VID3 Note: (1) 0:Connected to GND (2) 1:Open www.richtek-ic.com.tw ...
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... Typical Application Circuit DS9237-00 January 2002 Preliminary RT9237 www.richtek-ic.com.tw 5 ...
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... RT9237 Functional Pin Description VID4, VID3, VID2, VID1 and VID0 ( Pin1,2,3,4,5) DAC voltage identification inputs for VRM9.0. These pins are TTL-compatible and internally pulled to VDD if left open. COMP (Pin 6) Output of the error amplifier and input of the PWM comparator. FB (Pin 7) Inverting input of the internal error amplifier. ...
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... GND COMP R LOAD Voltage loop DS9237-00 January 2002 Preliminary PWMCP Current Balance PWMCP Processor SS Control OUT PWM1 PWM Logic & Driver PWM2 PWM Logic & Driver ISP1 ISN1 CS1 ISP2 ISN2 CS2 IN RT9600 V IN RT9600 Current loop RT9237 www.richtek-ic.com.tw 7 ...
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... For 2-channel application, connect PWM3 and PWM4 high. 3-channel application connect PWM4 high. Current sensing setting RT9237 senses the current of low side MOSFET in each synchronous rectifier when it is conducting for channel current balance and droop tuning. The differential sensing GM amplifier converts the voltage ...
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... I X4 ADJ Protection and SS function For OVP, the RT9237 detects the V pin. Eliminate the parasitic delay and noise influence on the PCB path for fast and accurate detection. The trip point of OVP is 120% of normal output level. The PWM outputs are pulled low to turn on the low side MOSFET and turn off the high side MOSFET of the synchronous rectifier at OVP ...
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... PWM GND +5V VDD PWM1 ISP1 VCC ISN1 PVCC COMP RT9600 FB PWM2 PWM VSEN GND ADJ RT9237 ISP2 DVD ISN2 IRMP PWM3 SS ISP3 VCC IMAX ISN3 PVCC GND RT9600 PWM GND b. Over current protection trip point(IMAX pin resistor, keep ISPx current<80uA at OCP ...
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... IMAX Take the temperature rising for consideration, (27°C) × R (70° IMAX IMAX {R (27°C)/R (70°C)} = 11.2KΩ DS(ON) DS(ON 0.1µF is the suitable value for most SS application. www.richtek-ic.com.tw RT9237 1M 10M 1000000 10000000 = suggested 2.7KΩ (27°C) ADJ =13.6KΩ ...
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... RT9237 Layout Guide Layout Guide Place the high-power switching components first, and separate them from sensitive nodes. 1. Most critical path: the current sense circuit is the most sensitive part of the converter. The current sense resistors tied to ISP1,2,3,4 and ISN1,2,3,4 should be located not more than 0.5 inch from the IC and away from the noise switching nodes ...
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... O1 V CORE C OUT IN Kelvin Sense Parallel Trace Fig.8 Layout Consideration PWM VCC IMAX IRMP COMP ADJ RT9237 FB R ISP ISP X ISN X VSEN R ISN Locate next to IC www.richtek-ic.com.tw RT9237 + Next to IC Pin( Locate next to FB Pin ...
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... RT9237 Package Information C Symbol www.richtek-ic.com.tw 14 Preliminary Dimensions In Millimeters Min Max 17.704 18.110 7.391 7.595 2.362 2.642 0.330 0.508 1.194 1.346 0.229 0.330 0.102 0.305 10.008 10.643 0.381 1.270 28–Lead SOP Plastic Package Dimensions In Inches ...
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... No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 DS9237-00 January 2002 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw RT9237 www.richtek-ic.com.tw 15 ...