sc480imltrt Semtech Corporation, sc480imltrt Datasheet
sc480imltrt
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sc480imltrt Summary of contents
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POWER MANAGEMENT Description The SC480 is a combination switching regulator and linear source/sink regulator intended for DDR1/2/3 memory systems. The purpose of the switching regulator is to generate the supply voltage, VDDQ, for the memory system pseudo-fi ...
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POWER MANAGEMENT POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifi cations below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specifi the Electrical Characteristics section is not implied. Exposure to ...
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POWER MANAGEMENT Electrical Characteristics (Cont.) TEST CONDITIONS 15V, VCCA = VDDP = VTTEN = EN/PSV = 5V, VDDQ = VTTIN = 1.8V Parameter VDDQ Controller FB Error Comparator Threshold (1) VDDQS Regulation Threshold On-Time Minimum Off-Time ...
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POWER MANAGEMENT POWER MANAGEMENT Electrical Characteristics (Cont.) TEST CONDITIONS 15V, VCCA = VDDP = VTTEN = EN/PSV = 5V, VDDQ = VTTIN = 1.8V Parameter Under-Voltage Fault Delay Under-Voltage Blank Time Output Over-Voltage Fault Over-Voltage Fault ...
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POWER MANAGEMENT Electrical Characteristics (Cont.) TEST CONDITIONS 15V, VCCA = VDDP = VTTEN = EN/PSV = 5V, VDDQ = VTTIN = 1.8V Parameter FB Input Thresholds FB Logic Input Low FB Logic Input High Gate Drives ...
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POWER MANAGEMENT POWER MANAGEMENT Shoot-Through Delay Timing Diagram LX DL tplhDL © 2006 Semtech Corp tplhDH 6 SC480 www.semtech.com ...
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... NMOS output and requires an external pull-up resistor. 14,15 VDDP +5V supply voltage input for the VDDQ gate drivers. © 2006 Semtech Corp. Ordering Information Device SC480IMLTRT SC480EVB PGND1 Notes Only available in tape and reel packaging. A reel contains 3000 devices. PGND1 2) This product is fully WEEE and RoHS compliant ...
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POWER MANAGEMENT POWER MANAGEMENT Pin Description (Cont.) Current limit input pin. Connect to drain of low-side MOSFET for RDS(on) sensing or the source 16 ILIM for resistor sensing through a threshold sensing resistor. 17,18 PGND1 Power ground for VDDQ switching ...
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POWER MANAGEMENT Block Diagram VCCA VDDQS +12% -12% REF DSCHG VCCA VTTRUN EN/ PSV TON TON/ TOFF VDDQS VDDQS DSCHG -10% +16% VMON -30% 1.5V FB -10 +16% © 2006 Semtech Corp. VTTEN OTSD POR/SS DRVH FEDLY DRVL ...
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POWER MANAGEMENT POWER MANAGEMENT Application Information Application Information +5V Bias Supplies The SC480 requires an external +5V bias supply in addition to the battery. If stand-alone capability is required, the +5V supply can be generated with an external linear regulator. ...
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POWER MANAGEMENT Application Information Referencing Figure 2, the equation for setting the output voltage is Current Limit Circuit Current limiting of the SC480 can be accomplished in two ways. The on-state ...
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POWER MANAGEMENT POWER MANAGEMENT Application Information (Cont.) Power Good Output The VDDQ controller has a power good (PGD) output. Power good is an open-drain output and requires a pull- up resistor. When the output voltage is +16%/-10% from its nominal ...
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POWER MANAGEMENT Application Information (Cont.) Switching Frequency Switching frequency determines the trade-off between size and effi ciency. Higher frequency increases switch- ing losses in the MOSFETs, since losses are a function of F*VIN2. Knowing the maximum input voltage and budget ...
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POWER MANAGEMENT POWER MANAGEMENT Application Information (Cont.) Dropout Performance The output voltage adjust range for continuous-conduction operation is limited by the fi xed 400nS (typical) Minimum Off-time One-shot. For best dropout performance, use the slowest on-time setting of 200KHz. When ...
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POWER MANAGEMENT Application Information (Cont.) For stability, place a 10Ω/1μF series combination from REF to VSSA. If REF load capacitance exceeds 1μF, place at least 10Ω in series with the load capacitance to prevent instability possible to use ...
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POWER MANAGEMENT POWER MANAGEMENT Application Information (Cont.) © 2006 Semtech Corp. where ERR is the transient output tolerance. For this TR case the load transient of 5A (10A - 5A). TRANS For our example: ERR = 144mV and ...
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POWER MANAGEMENT Application Information (Cont.) R BOT Z V TOP RIPPLE_VBA ( T 0.015 Secondly calculating the value of C this TOP TOP C TOP VBAT Since our example uses internal feedback ,this ...
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POWER MANAGEMENT POWER MANAGEMENT Application Information (Cont.) Thermal Considerations The junction temperature of the device may be calculated as follows θ J AMB JA where T is the junction temperature temperature the ...
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POWER MANAGEMENT Application Information (Cont.) accurate signal. The layout can be generally considered in three parts; the control section referenced to VSSA, the VTT output, and the switcher power section. Looking at the control section fi rst, locate all components ...
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POWER MANAGEMENT POWER MANAGEMENT Application Information (Cont.) VDDQ VTT 10uF 10uF 10uF 0805 0805 0805 R2 1MEG VBAT REF R5 10R 5V C13 C14 1uF 1nF VDDQ © 2006 Semtech Corp 0.1uF 5V MBR0530 C4 ...
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POWER MANAGEMENT Typical Characteristics 1.8V Effi ciency vs. Output Current Powersave Mode 100% VBAT = 10 90% VBAT = 20 80% 70% 60% 50 (A) OUT 2.5V Effi ciency vs. Output Current Powersave Mode 100% VBAT ...
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POWER MANAGEMENT POWER MANAGEMENT Typical Characteristics (Cont.) Load Transient Response 5A, Psave Mode Load Transient Response 0A, Psave Mode Load Transient Response 10A © 2006 Semtech Corp. Load Transient Response 5A, Continuous ...
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POWER MANAGEMENT Typical Characteristics (Cont.) VTT Load Transient Response, 1A Sink/Source, Psave Mode Startup (PSV), EN/PSV Going High © 2006 Semtech Corp. VTT Load Transient Response, 1A Sink/Source, Continuous Conduction Mode Startup (PSV), EN/PSV Going Low, VDDQ = 5A 23 ...
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POWER MANAGEMENT POWER MANAGEMENT Outline Drawing - MLPQ 24 (4x4mm) PIN 1 INDICATOR (LASER MARK) aaa C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 2. © ...
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... COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Phone: (805) 498-2111 Fax: (805) 498-3804 © 2006 Semtech Corp. K DIM Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 www.semtech.com 25 SC480 DIMENSIONS INCHES MILLIMETERS (.155) (3.95) 3.10 .122 .106 2.70 .106 2.70 ...