rt9244 Richtek Technology Corporation, rt9244 Datasheet
rt9244
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rt9244 Summary of contents
Page 1
... CORE independent to compensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The DAC output of RT9244 supports K8 CPU by 5-bit VID input, precise initial value & smooth V jump. The IC monitors the V CORE over-voltage protection. Soft-start, over-current protection and programmable under-voltage lockout are also provided to assure the safety of microprocessor and power system ...
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... RT9244 Typical Application Circuit www.richtek.com 2 DS9244-06 March 2007 ...
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... Switching frequency setting. Connect this pin to GND with a resistor to set the frequency. Frequency vs. R 450 400 350 300 250 200 150 100 DVD (Pin 32) Programmable power UVLO detection input. Trip threshold = 2. rising. DVD RT9244 (kΩ) www.richtek.com 3 ...
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... RT9244 Function Block Diagram www.richtek.com 4 DS9244-06 March 2007 ...
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... RT9244 Nominal Output Voltage DACOUT 1.550 1.525 1.500 1.475 1.450 1.425 1.400 1.375 1.350 1.325 1.200 1.275 1.250 1.225 1.200 1.175 1.150 1.125 1.100 1.075 1.050 1.025 1.000 0.975 ...
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... RT9244 Absolute Maximum Ratings Supply Voltage, V ------------------------------------------------------------------------------------------- 7V CC Input, Output or I/O Voltage ---------------------------------------------------------------------------------- GND-0. Package Thermal Resistance SOP-32, θ ----------------------------------------------------------------------------------------------------- 50°C/W JA Junction Temperature ------------------------------------------------------------------------------------------ 150°C Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- 260°C Storage Temperature Range --------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ----------------------------------------------------------------------------------- 2kV ...
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... VOSS VOSS GBW SR COMP = 10pF Z IMP GBW SR I ISPFSS I ISPOCP Δ OVT 4mA OVP OVP VSEN Rising V PGOOD− 4mA PGOODL PGOOD RT9244 Min Typ Max Units μ 0.95 1.0 1. MHz -- 3 -- V/μ kΩ MHz ...
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... RT9244 Typical Operating Characteristics 250 200 150 100 Offset Voltage Ross (kohm) Start-up @I (5V/Div (1V/Div) V OUT (5V/Div) PGOOD (5V/Div) PWM Time (10ms/Div) www.richtek.com 8 GM GM1 GM3 GM4 GM2 60 80 100 120 (mV) ...
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... For 3-Channel application, connect PWM4 high. of pulse width C Current Sensing Setting RT9244 senses the current of low side MOSFET in each to output by PWM synchronous rectifier when it is conducting for channel IN current balance and droop tuning. The differential sensing GM amplifier converts the voltage on the sense component ...
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... local feedback. Protection and SS Function R SP For OVP, the RT9244 detects the V of the differential amplifier output. Eliminate the delay due to compensation network (compared to sensing FB voltage for fast and accurate detection. The trip point of OVP is O OFF − ...
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... DAC offset voltage setting (VOSS pin & compen- sation network resistor). Power Sequence & SS DVD pin external resistor and SS pin capacitor. PCB Layout a. Kelvin sense for current sense GM amplifier input. b. Refer to layout guide for other item. RT9244 12V 12V V CORE 12V Current Sense Components www ...
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... RT9244 Design Example Given: Apply for three phase converter V = 12V 1.5V CORE I = 60A LOAD (MAX 120mV at full load DROOP OCP trip point set at 33A for each channel (S/ 6mΩ of low side MOSFET at 27°C DS(ON 2μ 9,000μF with 2mΩ ESR. ...
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... The compensation, bypass and other function setting components should be near the IC and away from the noisy power path DS9244-06 March 2007 SW1 IN SW2 Figure 7. Power Stage Ripple Current Path ) ensures the accurate DS(ON OUT C OUT L2 RT9244 R L www.richtek.com 13 ...
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... Locate near MOSFETs www.richtek.com 14 +12V or +5V C BOOT CORE C C OUT IN Kelvin Sense For Thermal Couple Figure 8. Layout Consideration PWM VCC RT VOSS COMP RT9244 SIP ISPx R ISNx R SIN VSEN ADJ GND DS9244-06 March 2007 + Next Locate next ...
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... No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com Dimensions In Inches Min Max 0.800 0.816 0.291 0.299 0.093 0.104 0.013 0.020 0.050 0.009 0.013 0.004 0.012 0.394 0.419 0.015 0.050 RT9244 www.richtek.com 15 ...