SC473 SEMTECH [Semtech Corporation], SC473 Datasheet
SC473
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SC473 Summary of contents
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... Other features include programmable soft-start, an open-drain PWRGD output, dual-level over-voltage and programmable over-current pro- tection. The SC473 is available in a space-saving 4x4mm, 24-pin MLP package. Updated - Aug 17, 2006 Single-Phase Single Chip ...
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... POWER MANAGEMENT Typical Application Circuit SC473 © 2006 Semtech Corp PMON FB ERROUT 21 DRN AGND 22 TG VREF 23 BST CLSET 24 GND ...
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... Semtech Corp. Condition Static Transient <100ns Static Transient <100ns θ STG T IRrefl ow < +125°C. J Condition Min 4.5 Rising 4.25 Hysteresis Falling UVLO Operating (Static) 3 SC473 Min Max Units -0.3 6 DRN, -0.3 BST, +0.3 V -0.3 V5, +0 ...
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... Current Sensing (CS+, CS-) CS+, CS- Input Bias Current Maximum Input Signal Zero-Crosssing Detector Threshold Powersave © 2006 Semtech Corp. Condition <85°C) J 1.15 - 0.85V 0.825V - 0.5V 0.475 - 0.375V 0.3V < DAC < 1.5V Start-up and Operating Discharge (SS = 0.5V) CS+ = CS- = 1.5V 4 SC473 Min Typ Max 0.8 2.0 0.45 0.55 40 -0.85 +0. -14 14 |50| 102 120 138 ...
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... Semtech Corp. Condition CLSET = 1.2V, TG Low CLSET = 1.2V, TG High HYS = 1V FB Rising Relative DAC FB Falling Relative DAC FB Rising Relative DAC PWRGD High Impedance PWRGD = 0.1V CS+, CS- = 4mV CS+, CS- = 16mV 5 SC473 Min Typ Max 50 80 125 |1| | 1.65 1.7 1.75 +160 +200 ...
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... G_DN C = 3nF 3nF TG From Hysteretic Comparator Inputs to Driver Output R at 25°C BG_UP BG_UP R at -40° to 125°C BG_UP BG_UP R at 25°C BG_DN BG_DN R at -40° to 125°C BG_DN BG_DN C = 3nF 3nF BG 6 SC473 Min Typ Max 1.75 2.0 2.25 4.1 5.8 7.5 3.48 5.8 9.24 0.9 1.3 1.7 0.76 1.3 1.7 0.42 0.6 0.78 0.34 0.6 1. ...
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... VID2 PGND PAD 4 VID1 5 VID0 6 HYS SC473 Pin Out Diagram Top View Marking Information yyww = Date Code (Example: 0550) xxxxx = Semtech Lot Number (Example: E9000) xxxxx = (Example: 1–100) © 2006 Semtech Corp. Ordering Information Device SC473MLTRT 18 PWRGD SC473EVB ...
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... Bootstrap pin - a capacitor is connected between BST and DRN to develop the fl oating 24 BST voltage for the switching MOSFET Thermal Pad Power ground for driver - connect with at least two vias to the system GND plane © 2006 Semtech Corp. Pin Description 8 SC473 www.semtech.com ...
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... Semtech Corp ERROR AMP - HYSTERETIC COMPARATOR + + - FILTER REFERENCE limit - + VID [4:0] CO DAC START UP DRIVERS CROSS CONDUCTION PROTECTION CO ZERO CS CROSSING SC473 9 SC473 ERROUT I - limit Hys_hi Hys_lo CO + VREF & UVLO - PWRGD LOGIC 3ms PWRGD TIME BST TG DRN V5 BG PGND www.semtech.com ...
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... The SC473 provides a complete solution to high perfor- mance graphics core requirements. In the SC473, the ripple for the hysteretic switching control is provided by DCR sensing. This provides several advan- tages over plain voltage-mode hysteretic converters, which switch on voltage ripple. • ...
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... If the FB voltage is 200mV greater than the DAC voltage (i.e., out of the pow- ergood window), the SC473 will latch off and hold the low- side driver on permanently. Either the power or EN must be recycled to clear the latch. The latch is disabled © ...
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... POWER MANAGEMENT Applications Information (Cont.) DC Sense Voltage RCS LOAD RCS LOAD L1 L-R Rcs R25 R25 100 100 Power Monitor Implementation for SC473 (R Sense) IR33 VDCR (R25 R25 VR33 IR33 R33 PMON_Ideal V R33 Vcc_core © 2006 Semtech Corp. +Vcc_core CS- R33 I V R33 ...
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... International Rectifi er Fairchild Semiconductor Siliconix Infenion Technologies Various Various Vishay / Panasonic Various IRC, Panasonic Panasonic / NEC-TOKIN SPCAP 13 SC473 Series or Part Number IRF7821, IRF6602, SSC3002S, Si4860DY,Si4410BDY Depends on Application X5R or better Schottky, 200mA or greater 0.2 μH - 0.5μH X5R or better ERJ-M1WTJ 330μF, max ESR 6mΩ ...
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... SC473 VID0 V OUT 0 1.1500V 1 1.1250V 0 1.1000V 1 1.0750V 0 1.0500V 1 1.0250V 0 1.0000V 1 0.9750V 0 0.9500V 1 0.9250V 0 0.9000V 1 0.8750V 0 0.8500V 1 0.8250V 0 0.8000V 1 0.7750V 0 0.7500V 1 0.7250V 0 0 ...
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... Figure 2 – Battery Mode Line and Load Regulation Battery Efficiency vs. Output Current V = 0.97500V OUT 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 Output Current (A) 19V 9V Figure 4 – Battery Mode Efficiency v/s Output Current PMON Error vs. Current V = 1.1500V OUT 9.00 14.00 19.00 24.00 29.00 Iout (A) DCR SENSE Figure 6 – Typical PMON Error v/s Output Current www.semtech.com SC473 20.00 22.00 24.00 20.00 22.00 24.00 34.00 ...
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... Figure 7 – Nominal Operation @ Iout = 30A Figure 9 – Output Voltage with 24A load step *Above performance graphs correspond to Applications Schematic on page 2 © 2006 Semtech Corp. Figure 8 – Voltage Transition 0.95V to 1.15V Figure 10 – Output Voltage with 24A dynamic load release 16 SC473 www.semtech.com ...
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... POWER MANAGEMENT Outline Drawing - MLP-32 Outline Drawing - MLP 4x4-24 © 2006 Semtech Corp. 17 SC473 www.semtech.com ...
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... POWER MANAGEMENT Land Pattern - MLP-32 Land Pattern - MLP 4x4-24 Contact Information Phone: (805) 498-2111 Fax: (805) 498-3804 © 2006 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 18 SC473 www.semtech.com ...