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| Preliminary RT9224C VRM 9.0 Synchronous PWM Buck Converter Controller and Output Voltage Monitor General Description The RT9224C is a high speed switching controller designed for use in Synchronous DC/DC buck converter for modern CPUs. The regulated output voltage is digitally programmable from 1.075V to 1.85V by a 5-bit DAC which provides initial accuracy of 1%. The RT9224C drives two external N-Channel MOSFETs, providing high efficiency and eliminating the need for high cost P-Channel devices. It senses the output current across the on-resistance of the N-Channel MOSFET and provides an adjustable current limit without external sense resistor. The RT9224C monitors the output voltage and provides the output signal for power-good and over-voltage protections. The switching frequency is 200kHz. The high switching frequency cooperating with a high speed error amplifier maintains a fast response to the dynamic load of modern CPUs. Features Simple Voltage-Mode PWM Control with Buck Rectification 1% DAC Output Voltage Accuracy 5-Bit Digital-to-Analog Output Voltage Range from 1.075V to 1.85V Fast Transient Response and Excellent Output Voltage Regulation Fault Protection for Over-Voltage and Over- Current Power-Good Output Voltage Monitor Applications Power Supply for VRM 9.0 Microprocessors Low-Voltage Distributed Power Supplies High Power 5V to 1.075V to 1.85V Switching Regulator Pin Configurations (TOP VIEW) VSEN OCSET SS VID0 VID1 VID2 VID3 VID4 NC FB 20 19 18 17 16 15 14 13 12 11 NC OVP VCC LGATE PGND BOOT UGATE PHASE PGOOD GND Ordering Information RT9224C Package Type S : SOP-20 Operating Temperature Range C : Commercial Standard P : Pb Free with Commercial Standard 2 3 4 5 6 7 8 9 10 SOP-20 DS9224C-02 March 2004 www.richtek.com 1 RT9224C Typical Application Circuit L1 1uH VIN = 5V F1 + Preliminary CIN 2N6394 2K 2 x1uF 5 x1000uF +12V 10 0.1uF 15V VCC 18 SS 3 OVP 19 2 OCSET 1000pF 1K 0.1uF VSEN 1 OSC VID0 VID1 VID2 VID3 VID4 FB 4 5 6 7 8 Monitor and Protection 12 PGOOD 15 BOOT 14 UGATE 13 PHASE Q1 L2 3uH D2 Q2 COUT 9 x1000uF 4.99K 0.68uF +VO + D/A 10 + GND + 17 LGATE 16 PGND 750K Component Selection Notes: COUT, CIN - Each 1000F 6.3WV DC, Sanyo MV-GX or Equivalent. L2 - Core: Micrometals T50-52B; Winding: 10 Turns of 16AWG. L1 - Core: Micrometals T50-52; Winding: 5 Turns of 18AWG. D2 - 3A, 40V Schottky, Motorola MBR340 or Equivalent. Q1, Q2 - PHB83N03LT; PHB95N03LT www.richtek.com 2 DS9224C-02 March 2004 Preliminary Function Block Diagram VCC RT9224C VSEN 110% Power-On Reset (POR) + + PGOOD 90% 115% + + OCSET - Over Current Reference 200uA 4.5V Soft Start 10uA SS BOOT UGATE Inhibit Gate Control Logic PHASE Over Voltage OVP VID0 VID1 VID2 VID3 VID4 TTL D/A Converter (DAC) DACOUT Error Amplifier + - PWM Comparator + Oscillator PWM FB LGATE PGND GND DS9224C-02 March 2004 www.richtek.com 3 RT9224C Functional Pin Description Pin No. Pin Name 1 VSEN Preliminary Pin Function Output voltage monitoring input for OVP & PGOOD Over current set pin, sinks 200A through a resistor (ROCS) from this pin to upper N-MOSFET to set the trip point: 2 OCSET IPEAK = 200uA x ROCS MOSFET - on resistance An over-current trip cycles the soft-start function 3 4 5 6 7 8 9,20 10 11 12 13 14 15 16 17 18 19 SS VID0 VID1 VID2 VID3 VID4 NC FB GND PGOOD PHASE UGATE BOOT PGND LGATE VCC OVP Soft start speed is set by internal 10A current source and capacitor from this pin to GND Switching regulator output voltage setting Switching regulator output voltage setting Switching regulator output voltage setting Switching regulator output voltage setting Switching regulator output voltage setting No connection Feedback input pin IC signal ground Open drain logic output This pin is pulled low when the converter output is not within 10% of the DACOUT reference voltage Current limit sense input High side driver output Driver power Low side driver GND Low side driver output Power supply input Over voltage protection This pin is pulled high when the VSEN voltage is over 15% of the DACOUT reference voltage www.richtek.com 4 DS9224C-02 March 2004 Preliminary Table 1 Output Voltage Program Pin Name VID4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 VID3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 VID0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 RT9224C Nominal Output Voltage DACOUT 1.075V 1.100V 1.125V 1.150V 1.175V 1.200V 1.225V 1.250V 1.275V 1.300V 1.325V 1.350V 1.375V 1.400V 1.425V 1.450V 1.475V 1.500V 1.525V 1.550V 1.575V 1.600V 1.625V 1.650V 1.675V 1.700V 1.725V 1.750V 1.775V 1.800V 1.825V 1.850V Note: (1) 0:Connected to GND (2) 1:Open DS9224C-02 March 2004 www.richtek.com 5 RT9224C Absolute Maximum Ratings Preliminary Supply Voltage ------------------------------------------------------------------------------------------------------- +15V Boot Voltage ---------------------------------------------------------------------------------------------------------- +15V Input, Output or I/O Voltage --------------------------------------------------------------------------------------- GND -0.3V to VCC + 0.3V Storage Temperature Range --------------------------------------------------------------------------------------- -65C to 150C Package Thermal Resistance SOP-20, JA --------------------------------------------------------------------------------------------------------------------------------------------------------- 87C/W Recommended Operating Conditions Supply Voltage ------------------------------------------------------------------------------------------------------- +12V 10% Ambient Temperature Range -------------------------------------------------------------------------------------- 0C to 70C Junction Temperature Range -------------------------------------------------------------------------------------- 0C to 125C Electrical Characteristics (TA = 25 C, recommended operating conditions, unless otherwise specified) Parameter VCC Supply Current Nominal Supply Power-On Reset VCC Rising Threshold VCC Falling Threshold Rising VOCSET Threshold Oscillator Free Running Frequency Ramp Amplitude Reference and DAC DAC (VID0 - VID4) Input Low Voltage DAC (VID0 - VID4) Input High Voltage DACOUT Voltage Accuracy Error Amplifier DC Gain Gate Drivers UGATE Source UGATE Sink LGATE Source LGATE Sink Symbol Test Conditions UGATE and LGATE Open Min ----170 Typ 3 9.5 7.5 1.6 200 1.9 ---65 8 5 500 5 Max ----230 -0.8 -+1.0 ------ Units mA V V V ICC VOCSET = 4.5V VOCSET = 4.5V kHz VP-P V V % dB mA VOSC --2.0 -1.0 ------ RUGATE VBOOT - VPHASE = 12V RUGATE VUGATE - VPHASE = 1V ILGATE VCC = 12V, VLGATE = 6V RLGATE VLGATE = 1V To be continued www.richtek.com 6 DS9224C-02 March 2004 Preliminary Parameter Protection Over-voltage Trip (VSEN/DACOUT) OCSET Current Source OVP Sourcing Current Soft-Start Current Power Good Upper Threshold (VSEN/DACOUT) Lower Threshold (VSEN/DACOUT) Hysteresis (VSEN/DACOUT) PGOOD Voltage Low VSEN Rising VSEN Falling Upper and Lower Threshold VPGOOD IPGOOD = -5mA 106 89 --IOCSET IOVP ISS VOCSET = 4.5V VSEN = 5.5V, VOVP = 0V VSS = 1.5V -167 60 -Symbol Test Conditions Min RT9224C Typ 115 200 -10 --2 0.5 Max 120 233 --114 96 --Units % A mA A % % % V DS9224C-02 March 2004 www.richtek.com 7 RT9224C Outline Dimension A Preliminary H M J B F C I D Symbol A B C D F H I J M Dimensions In Millimeters Min 12.598 7.391 2.362 0.330 1.194 0.229 0.102 10.008 0.381 Max 13.005 7.595 2.642 0.508 1.346 0.330 0.305 10.643 1.270 Dimensions In Inches Min 0.496 0.291 0.093 0.013 0.047 0.009 0.004 0.394 0.015 Max 0.512 0.299 0.104 0.020 0.053 0.013 0.012 0.419 0.050 20- Lead SOP Plastic Package RICHTEK TECHNOLOGY CORP. Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 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.com www.richtek.com 8 DS9224C-02 March 2004 |
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