Single-Phase Single Chip Graphics Core Power Supply

Single-Phase Single Chip Graphics Core Power Supply POWER MANAGEMENT Description The SC473 is a single-phase chip, high-performance PWM controller designed to power advanced graphic cores. Onchip support is provided that includes slew-rate controlled VID transitions. The SC473 implements hysteretic control technology which provides the fastest possible transient response while avoiding the stability issues inherent to classical PWM www.DataSheet4U.com controllers. Eliminating the sense resistors reduces costs and PCB area, plus increases system efficiency. Integrated SmartDriver™ technology initially turns on the high-side driver with ‘soft’ drive to reduce ringing, EMI, and capacitive turn-on of the low side MOSFET, while also increasing overall efficiency. Hysteretic operation adaptively reduces the SC473 switching frequency at light loads. Combined with an automatic “powersave” mode which prevents negative current flow in the low-side FET, system efficiency is significantly enhanced during light loading conditions. A 5-bit DAC, accurate to 0.85%, sets the output voltage reference, and implements the voltage range required by the processor. The DAC slew rate is externally programmed to minimize transient currents and audible noise. True differential remote sensing provides accurate point-of-load regulation at the processor die. Other features include programmable soft-start, an open-drain PWRGD output, dual-level over-voltage and programmable over-current protection. The SC473 is available in a space-saving 4x4mm, 24-pin MLP package. SC473 Features Single-Phase Solution with Integrated Drivers Hysteretic Control for Fast Transient Response SmartDriver™ for reduced EMI True Differential Remote (die) Sensing VID Programmed Voltage Delayed Power Good Signal with Blanking Programmable Soft-Start and DAC Slew Control Programmable OCP Threshold Supports all Ceramic Decoupling Solutions 24-Pin MLP (4x4) Lead-Free Package RoHS and WEEE compliant Applications High Performance Graphics Embedded Applications Updated - Aug 17, 2006 1 www.semtech.com www.DataSheet4U.com 9 8 7 6 5 R11 1 0 C5 1UF 9 8 7 6 5 2 9 8 7 6 5 1 TG +VGFX 1 L1 0.33UH + 3 2 1 PMON C87 1 1 2 2 C85 R16 1 4 2 1 16.2K 22NF Q2 D D Q3 CR2 MBRS140L R29 C64 C88 330UF + 330UF 330UF 1 2 3 2 1 2 3 2 1 PGD C6 1NF *10K 2 PMON 2 BST TG DRN BG V5 PMON 24 23 22 21 20 19 GND CLSET VREF AGND ERROUT FBSS HYS 25 1 CLSET 7 VREF 8 9 E_OUT 10 11 12 2 C63 1 10NF 1 C66 C89 *100PF C13 *100PF 1 1 2 C14 *100PF R22 500K 2 E-RC 1 2 2 2 2 2 VREF 100PF © 2006 Semtech Corp. +VDC +V5S +V5R Notes: 1 1 1 1 1 1 1) '*' in value = NO_POP 1 1 C86 C4 2 1UF 2 4 2 25V C1 10UF 2 2 25V 25V C2 10UF 10UF 2 2 25V 25V C7 10UF 10UF 2 25V C3 C12 10UF *C10 *1uF CR1 MBR0530 1 Q1 D +V3.3S 2 BST R2 1 2 1.15V @ 30A 5 1 3 1 4 2 6 C90 + C91 + 330UF POWER MANAGEMENT Typical Application Circuit SC473 10K 2 PGD DRN BG 1 4 2 1 2 1 1 C24 C16 *1NF 2 2 10uF 10uF EN 2 R31 499 R13 10K R32 16.2K +VGFX Note: All Grounds Tied together at output Caps. R23 VID4 VID3 VID2 VID1 VID0 PGD EN RAMP CS+ CSFB+ VID4 VID3 VID2 VID1 VID0 1 2 3 4 5 6 VID4 VID3 VID2 VID1 VID0 HYS SC473 U1 1 0 R34 499 18 17 16 RAMP 15 14 13 2 1 C65 100PF SS R102 10 1 C84 2 2 100PF R17 130K 1 1 FB+ FBR103 10 C8 1NF R19 *8k 1 R18 130K To Regulation Point 2 1 C9 *100PF R20 90K C11 1 2 2 *560PF VREF SC473 www.semtech.com SC473 POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Supply Voltage (V5) Condition Min -0.3 Max 6.5 30 34 6 25 29 BST, +0.3 V5, +0.3 VCCA +0.3 28 Units V V V V V V V V V o Static BST to PGND BST to DRN www.DataSheet4U.com DRN to PGND TG to PGND BG to PGND All Other Pins to PGND Thermal Resistance Junction to Ambient JESD51 Standard Method* Operating Junction Temperature Range Storage Temperature Range Peak IR Reflow (10-40sec) θJA TJ TSTG TIRreflow Static Transient <100ns Transient <100ns -0.3 -0.3 -0.3 -2 -5 DRN, -0.3 -0.3 -0.3 C/W o -40 -65 125 150 260 C C C o o *Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics Unless otherwise specified, VccA = V5 = 5V, -40° < TJ < +125°C. Parameter Control / Driver Supply (V5) V5 Operating Range V5 UVLO Condition Min Typ Max Units 4.5 Rising Hysteresis Falling EN = L0 4.25 50 5.0 4.4 150 5.5 4.5 250 10 V V mV μA mA mA V5 Current In UVLO Operating (Static) 0.8 10 1.3 12 © 2006 Semtech Corp. 3 www.semtech.com SC473 POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Logic Inputs (EN, VID [4:0]) Enable Threshold VID [4:0] Threshold Input Impedance Reference www.DataSheet4U.com (DAC, SS, VREF), (0 < TJ <85°C) 1.15 - 0.85V 0.825V - 0.5V 0.475 - 0.375V DAC Sink/Source Ability SS Slew Current SS Discharge Threshold VREF Accuracy VREF Sink/Source Ability Remote Sense (FB+, FB-) Bandwidth(1) Error Amplifier (ERROUT) Gain Bandwidth(1) Current Sensing (CS+, CS-) CS+, CS- Input Bias Current Maximum Input Signal Zero-Crosssing Detector Threshold Powersave CS+ = CS- = 1.5V 50 -6 6 1 μA mV mV 2 19 MHz 2 MHz 1.97 |1.5| 0.3V < DAC < 1.5V Start-up and Operating Discharge (SS = 0.5V) -0.85 -7 -14 |50| 102 15 50 2.00 400 2.03 120 138 +0.85 7 14 % mV mV μA μA mA mV V mA 0.8 0.45 40 2.0 0.55 V V kΩ Condition Min Typ Max Units DAC Error + Internal Offset © 2006 Semtech Corp. 4 www.semtech.com SC473 POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Current Sensing (CS+, CS-) (Cont.) Low-Pass Filter Corner Frequency(1) Current Limit Combined System (CLSET) CLSET = 1.2V, TG Low CL System Accuracy www.DataSheet4U.com CLSET Input Bias Current Hysteresis Setting (HYS) HYS Input Bias Current HYS Gain (internal hysteresis setting relative to voltage applied at HYS pin) OVP and Internal Powergood Fixed Over-Voltage Protection Threshold Power Good Window Upper Threshold Power Good Window Lower Threshold Power Good Window Lower Hysteresis Powergood (PWRGD) Leakage On-Resistance Power Monitor CS+, CS- = 4mV CS+, CS- = 16mV 74 530 148 590 222 mV 650 PWRGD High Impedance VPG = 5V PWRGD = 0.1V 20 1 100 μA Ω FB Rising Relative DAC FB Falling Relative DAC FB Rising Relative DAC 1.65 +160 -360 30 1.7 +200 -300 50 1.75 +240 -240 70 V mV mV mV HYS = 1V 4 7 |1| 10 μA % CLSET = 1.2V, TG High 28 16 52 mV 32 |1| μA 50 80 125 kHz Condition Min Typ Max Units PMON Output Voltage VOUT = 1.2875 TJ = 25 oC © 2006 Semtech Corp. 5 www.semtech.com SC473 POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter High-Side Driver (TG, BST, DRN) Peak Current(1)(2) RTTG_UP, DRN < 0.5V, 25°C G_UP Condition Min Typ Max Units 1.75 4.1 3.48 0.9 0.76 0.42 0.34 17 9 30 10 2.0 5.8 5.8 1.3 1.3 0.6 0.6 22 12 45 20 2.25 7.5 9.24 1.7 1.7 0.78 1.01 27 15 60 30 A Ω Ω Ω Ω Ω Ω ns ns ns ns RTTG_UP, DRN < 0.5V, -40 to 125°C G_UP www.DataSheet4U.com On-Resistance RTG_UP DRN > 0.5V, 25°C TG_UP,,,, RTTG_UP, DRN > 0.5V, -40 to 125°C G_UP RTG_DN, at 25°C TG_DN RTTG_DN, -40 to 125°C G_DN Rise Time(1, 2) Fall Time(1, 2) Propagation Delay(1, 2) Shoot-thru Protection Delay(1) Lower-Side Driver (BG, V5, PGND) Peak Current(1, 2) CTG = 3nF CTG = 3nF From Hysteretic Comparator Inputs to Driver Output 3.5 RBG_UP at 25°C BG_UP 4.0 1.3 1.3 0.5 0.5 7 3.5 4.5 1.7 2.1 0.65 0.86 9 4.5 A Ω Ω Ω Ω ns ns 0.9 0.76 0.35 0.28 5 2.5 On-Resistance RBG_UP at -40° to 125°C BG_UP RBG_DN at 25°C BG_DN RBG_DN at -40° to 125°C BG_DN Rise Time(1, 2) Fall Time(1, 2) Notes: (1) Guaranteed by design. (2) TJ = 25°C CBG = 3nF CBG = 3nF © 2006 Semtech Corp. 6 www.semtech.com SC473 POWER MANAGEMENT Pin Configuration PMON DRN BST Ordering Information Device(2) Package MLP-4x4-24 Temp Range (TJ) -40°C to +85°C BG VID4 VID3 VID2 VID1 VID0 HYS 1 2 3 4 5 6 24 23 22 21 20 19 TG V5 SC473MLTRT (1)(3) 18 17 16 15 14 13 PWRGD EN RAMP CS+ CSFB+ SC473EVB EVALUATION BOARD PGND PAD www.DataSheet4U.com 7 CLSET 8 VREF 9 10 11 12 AGND ERROUT FBSS SC473 Pin Out Diagram Top View Notes: 1) Only available in tape and reel packaging. A reel contains 3000 devices. 2) This device is ESD sensitive. Use of standard ESD handling precautions is required. 3) Lead-free package compliant with J-STD-020B. Qualified to support maximum IR Reflow temperature of 260oC for 30 seconds. This product is fully WEEE and RoHS compliant. Marking Information yyww = Date Code (Example: 0550) xxxxx = Semtech Lot Number (Example: E9000) xxxxx = (Example: 1–100) © 2006 Semtech Corp. 7 www.semtech.com SC473 POWER MANAGEMENT Pin Descriptions SC473 Pin Configuration Pin # 1 2 3 4 www.DataSheet4U.com 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin Name VID4 VID3 VID2 VID1 VID0 HYS CLSET VREF AGND ERROUT FBSS FB+ CSCS+ RAMP EN PWRGD PMON V5 BG DRN TG BST Thermal Pad VID least significant bit Core comparator hysteresis - a resistor divider from VREF to AGND on this pin sets the hysteresis voltage Current limit set - a resistor divider from VREF to AGND on this pin sets the OCP threshold Internal reference voltage (2V) - bypass to AGND with a 1000pF NPO ceramic capacitor Quiet ground for analog control circuits Error amplifier compensation pin Remote GND sense - connect to VSS_Sense at the CPU socket Soft-start. The external NPO ceramic capacitor at this pin defines the soft-start ramp Remote die sense of core voltage - connect to VCC_Sense at the CPU socket Inverting input to Current-Sense amplifier Non-inverting input to Current-Sense amplifier An external R-C defines the internal slope ramp Enable control pin - active high Power good indicator, active high, open drain output Power Monitor output Input supply for both contr