Multi-Phase PWM Controller

www.DataSheet4U.com RT9243 Multi-Phase PWM Controller for CPU Core Power Supply General Description The RT9243 is a multi-phase buck DC/DC controller integrated with all control functions for GHz CPU VRM. The RT9243 controls 2, 3 or 4 buck switching stages operating in interleaved phase set automatically. The multiphase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the component dimension and the output voltage ripple in load transient. RT9243 controls both voltage and current loops to achieve good regulation, response & power stage thermal balance. Precise current loop using RDS(ON) as sense component builds precise load line for strict VRM DC & transient specification and also ensures thermal balance of different power stages. The settings of current sense, droop tuning, VCORE initial offset 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 DAC output of RT9243 supports VRD10.x by 6-bit VID input, precise initial value & smooth VCORE transient at VIID jump. The IC monitors the VCORE voltage for PGOOD and 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. Features Multi-Phase Power Conversion with Automatic Phase Selection VRD10.x DAC Output with Active Droop Compensation for Fast Load Transient Smooth VCORE Transition at VID Jump Power Stage Thermal Balance by RDS(ON) Current Sense Hiccup Mode Over-Current Protection Programmable Switching Frequency (50kHz to 400kHz per Phase), Under-Voltage Lockout and Soft-Start High Ripple Frequency Times Channel Number RoHS Compliant and 100% Lead (Pb)-Free Applications Intel® Processors Voltage Regulator: VRD10.x Low Output Voltage, High Current DC-DC Converters Voltage Regulator Modules Pin Configurations (TOP VIEW) OVP PGOOD VID4 VID3 VID2 VID1 VID0 VID125 VOSS ADJ SS FB COMP VDIF ISN4 ISN3 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 RT DVD VCC PWM4 ISP4 ISP2 PWM2 PWM1 ISP1 ISP3 PWM3 GND SGND VSEN ISN1 ISN2 Ordering Information RT9243 Package Type S : SOP-32 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Note : SOP-32 RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating. DS9243-07 March 2007 www.richtek.com 1 +12V +12V C7 4.7uF 2 BOOT PVCC PHASE LGATE GND 4 IPD06N03LA C9 0.01uF 5 Q2 R14 4.7 VCC PWM 8 IPD09N03LA L1 1uH UGATE 7 C4 1uF +12V C5 1uF 3 RT DVD VCC PWM4 ISP4 ISP2 PWM2 PWM1 ISP1 ISP3 PWM3 GND SGND VSEN ISN1 ISN2 17 R12 2k +12V 18 R11 2k 19 +12V C16 1uF C17 4.7uF R17 10 2 7 6 C15 1uF 3 C18 2200uF 20 21 GND 4 22 C10 1uF 3 PWM LGATE 5 23 R10 2k 6 VCC 24 PHASE R9 2k PVCC 7 8 25 UGATE R15 10 2 BOOT IPD09N03LA Q4 IPD06N03LA 26 27 C12 4.7uF R8 2k 28 +12V C11 1uF C13 2200uF L2 1uH C25 to C28 2200uF x 4 C14 0.01uF 29 +12V R7 1k VCORE C20 to C24 2200uF x 5 30 R6 12k 31 32 R5 4.7k 6 C8 2200uF +5V R13 10 C6 1uF www.DataSheet4U.com www.richtek.com 2 RT9600 1 Q1 RT9243 RT9243 OVP < 1 OVP PG_VCORE < 2 PGOOD VID4 > 3 VID4 Typical Application Circuit VID3 > 4 VID3 VID2 > 5 VID2 VID1 > 6 VID1 VID0 > 7 VID0 RT9600 1 Q3 VID125 > 8 R1 100k VID125 9 VOSS 10 ADJ R16 4.7 C1 0.1uF 11 SS 12 FB R2 15k C2 22nF 13 COMP C3 33pF 14 VIDF 15 ISN4 R3 2.4k 16 ISN3 R4 2k RT9600 BOOT PVCC VCC PWM LGATE GND 4 UGATE PHASE 1 8 Q5 IPD09N03LA Q6 5 1uH R18 4.7 IPD06N03LA C19 0.01uF DS9243-07 March 2007 www.DataSheet4U.com RT9243 Functional Pin Description OVP (Pin 1) Over voltage trip output. PGOOD (Pin 2) Power good open-drain output. VID4 (Pin 3), VID3 (Pin 4), VID2 (Pin 5), VID1 (Pin 6), VID0 (Pin 7) & VID125 (Pin 8) DAC voltage identification inputs for VRD10.x. These pins are internally pulled to 3V if left open. VOSS (Pin 9) VCORE initial value offset. Connect this pin to GND with a resistor to set the offset value. ADJ (Pin 10) Current sense output for active droop adjust. Connect a resistor from this pin to GND to set the load droop. SS (Pin 11) Connect this SS pin to GND with a capacitor to set the soft-start time interval. Pulling this pin below 1V (ramp valley of sawtooth wave in pulse width modulator) would make all PWMs low, turn on low side MOSFETs and turn off high side MOSFETs. FB (Pin 12) Inverting input of the internal error amplifier. COMP (Pin 13) Output of the error amplifier and input of the PWM comparator. VDIF (Pin 14) VCORE differential sense output. VSEN (Pin 19) VCORE differential sense positive input. SGND (Pin 20) VCORE differential sense negative input. GND (Pin 21) Ground for the IC. DS9243-07 March 2007 www.richtek.com 3 PWM1 (Pin 25), PWM2 (Pin 26), PWM3 (Pin 22) & PWM4 (Pin 29) PWM outputs for each driven channel. Connect these pins to the PWM input of the MOSFET driver. For systems which use 3 channels, connect PWM4 high. Two channel systems connect PWM3 and PWM4 high. ISN1 (Pin 18), ISN2 (Pin 17), ISN3 (Pin 16) & ISN4 (Pin 15) RDS(ON) current sense inputs from each individual converter channel sense component's GND node. ISP1 (Pin 24), ISP2 (Pin 27), ISP3 (Pin 23) & ISP4 (Pin 28) RDS(ON) current sense inputs for each individual converter channel. Tie this pin to the component's sense node. VCC (Pin 30) IC power supply. Connect this pin to a 5V supply. DVD (Pin 31) Programmable power UVLO detection input. Trip threshold = 2V at VDVD rising. RT (Pin 32) Switching frequency setting. Connect this pin to GND with a resistor to set the frequency. 450 400 350 300 Frequency vs. RRT f OSC(kHz) 250 200 150 100 50 0 0 10 20 30 40 50 60 70 RRT (kΩ) www.DataSheet4U.com Power On Reset + + PWMCP INH Function Block Diagram + + OVP Trip Point INH + + - OCP Setting + + + + DAC + Droop PG Trip Point Offset Currrent Source/Sink + + Current Correction VOSS Error Amplifier GAP Amplifier SS Control + + + + - SGND VSEN - Buffer Amplifier SUM/M VDIF SS FB COMP ADJ GND + + - - + + - - - + VID0 VID1 VID2 VID3 VID4 VID125 INH DAC PWM Logic & Driver Oscillator & Sawtooth + + - + - + www.richtek.com 4 OVP PGOOD VCC DVD RT INH RT9243 PWM Logic & Driver PWM1 PWM2 PWMCP PWM Logic & Driver PWM3 PWMCP INH PWM Logic & Driver PWMCP PWM4 ISN1 ISP1 ISN2 ISP2 ISN3 ISP3 ISN4 ISP4 DS9243-07 March 2007 www.DataSheet4U.com RT9243 Table 1. Output Voltage Program Pin Name VID4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 VID3 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 VID2 1 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 VID1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 0 0 1 1 1 1 VID0 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 0 0 VID125 X 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 Nominal Output Voltage DACOUT No CPU 0.8375V 0.850V 0.8625V 0.875V 0.8875V 0.900V 0.9125V 0.925V 0.9375V 0.950V 0.9625V 0.975V 0.9875V 1.000V 1.0125V 1.025V 1.0375V 1.050V 1.0625V 1.075V 1.0875V 1.100V 1.1125V 1.125V 1.1375V 1.150V 1.1625V 1.175V 1.1875V 1.200V 1.2125V To be continued DS9243-07 March 2007 www.richtek.com 5 www.DataSheet4U.com RT9243 Table 1. Output Voltage Program Pin Name VID4 1 1 1 1 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 VID3 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 VID2 0 0 0 0 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 VID1 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 1 1 1 VID0 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 VID125 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 Nominal Output Voltage DACOUT 1.225V 1.2375V 1.250V 1.2625V 1.275V 1.2875V 1.300V 1.3125V 1.325V 1.3375V 1.350V 1.3625V 1.375V 1.3875V 1.400V 1.4125V 1.425V 1.4375V 1.450V 1.4625V 1.475V 1.4875V 1.500V 1.5125V 1.525V 1.5375V 1.550V 1.5625V 1.575V 1.5875V 1.600V Note: (1) 0 : Connected to GND (2) 1 : Open (3) X : Don't Care www.richtek.com 6 DS9243-07 March 2007 www.DataSheet4U.com RT9243 Absolute Maximum Ratings (Note 1) Supply Voltage, VCC -------------------------------------------------------------------------------------------- 7V Input, Output or I/O Voltage ----------------------------------------------------------------------------------- GND-0.3V to VCC+0.3V Package Thermal Resistance SOP-32, θJA ------------------------------------------------------------------------------------------------------ 50°C/W 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 MM (Machine Mode) -------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 3) Supply Voltage, VCC -------------------------------------------------------------------------------------------- 5V ± 10% Ambient Temperature Range ---------------------------------------------------------------------------------- 0°C to 70°C Junction Temperature Range ---------------------------------------------------------------------------------- 0°C to 125°C Electrical Characteristics (VCC = 5V, TA = 25°C, unless otherwise specified) Parameter VCC Supply Current Nominal Supply Current Power-On Rese