SC194AMLTRT Semtech, SC194AMLTRT Datasheet
SC194AMLTRT
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SC194AMLTRT Summary of contents
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... Space-saving lead-free package - MLP-10 3mm Applications Cell phones Wireless communication chipset power Personal media player Notebook and sub-notebook computers PDAs and mobile communicators WLAN peripherals SC194A VIN LX EN SYNC/PWM VOUT VID0 VID1 PGND MODE GND 1 SC194A L1 V 1.8V 4.7μ OUT 10μF www.semtech.com OUT ...
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... Electrical Characteristics Unless otherwise noted 3.6V SYNC/PWM = Parameter Symbol Input Voltage Range VOUT Accuracy VOUT Temperature Accuracy V Line Regulation V Load Regulation (PWM) V PSAVE Regulation V P-Channel On Resistance N-Channel On Resistance Start-Up Time P-Channel Current Limit © 2006 Semtech Corp. Symbol OUT V LX θ ( ...
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... SYNC Frequency (upper) SYNC Frequency (lower) UVLO Threshold (upper) UVLO Hysteresis Thermal Shutdown Thermal Shutdown Hysteresis Logic Input High Logic Input Low Logic Input Current High Logic Input Current Low © 2006 Semtech Corp. Conditions SYNC/PWM = GND OUT OUT OUT(Programmed) ...
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... PWM VOUT 5 MLP10: 3X3 10 LEAD Marking Information © 2006 Semtech Corp. Ordering Information DEVICE SC194AMLTRT SC194AEVB Ordering Information 10 LX Notes: 1) Lead-free packaging only. This product is fully WEEE and RoHS compliant. 9 PGND 2) Available in tape and reel only. A reel contains 3000 devices. 8 GND ...
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... POWER MANAGEMENT Block Diagram EN 4 SYNC OSC & Slope 3 /PWM Generator 500mV Ref 2 MODE VID1 7 Voltage Select VID0 6 VOUT 5 © 2006 Semtech Corp. Plimit Amp Control Logic PWM Comp Error Amp PSAVE Comp 5 SC194A PRELIMINARY 1 VIN Current Amp 10 LX Nlimit Amp 9 PGND 8 GND www ...
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... Inductor connection to the switching FETs THERMAL Pad for heatsinking purposes - not connected internally. Connects to ground plane using T multiple vias. PAD © 2006 Semtech Corp. to select 100% duty cycle function, MODE = GND to disable IN for forced PWM mode or GND to allow the part to enter PSAVE IN 6 ...
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... Protection Features The SC194A provides the following protection features: • Thermal shutdown • Current limit © 2006 Semtech Corp. • Over-voltage protection • Soft-start Thermal Shutdown The device has a thermal shutdown feature to protect the SC194A if the junction temperature exceeds 145°C. In thermal shutdown the on-chip power devices are disabled, tri-stating the LX output ...
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... V OUT -2% Inductor Current 0 A Time © 2006 Semtech Corp. 100% Duty Cycle Operation The 100% duty cycle mode may be selected by connecting the MODE pin high. This will allow the SC194A to maintain output regulation under low input voltage/high output voltage conditions. In 100% duty cycle operation, as the input supply drops toward the output voltage, the PMOS on-time increases linearly above the maximum value in fi ...
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... If PSAVE operation is required the minimum capacitor value is 22μF. © 2006 Semtech Corp. Output voltage ripple is a combination of the voltage ripple from the inductor current charging and discharging the output capacitor and the voltage created from the inductor current ripple through the output capacitor ESR ...
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... Place the inductor and fi lter capacitors as close to the device as possible and use short wide traces between the power components. © 2006 Semtech Corp. 2. Route the output voltage feedback path away from the inductor and LX node to minimize noise and magnetic interference. ...
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... Effi ciency vs. Input Voltage 100 95 V =1.8V,PWM OUT OUT V =1V,PWM OUT 75 70 2.5 3.5 4.0 3.0 Vin(V) I =500 mA(PWM)/50 mA(PSAVE) OUT © 2006 Semtech Corp. = 1.8V OUT 100 V =4.2V PWM IN =3.6V PWM 0 1.2V OUT 100 V =4.2V PWM IN =3.6V PWM 0 =1.8V,PSAVE OUT ...
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... Quiescent Current vs. Input Voltage PWM Mode 6 5.5 5 4.5 4 3.5 3 2.5 3 3.5 4 4.5 V (V) IN © 2006 Semtech Corp. 1.8025 1.8020 1.8015 1.8010 1.8005 1.8000 1.7995 1.7990 1.7985 1.7980 1.7975 5.0 5 ° -40 ° 0. ° ...
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... V =1.8V, l =1.4A, IN OUT OUT SYNC/PWM=1.15MHz ext clock PWM Operation Time (1us/div) Condition V =3.6V, V =1.8V, l =150mA, IN OUT OUT SYNC/PWM=V IN © 2006 Semtech Corp. Switching Frequency vs. Temperature 1050 1040 1030 1020 1010 1000 990 980 970 960 950 -50 -30 4.7 5.2 V (50mV/div) ...
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... V =1.8V, l =10mA, IN OUT OUT SYNC/PWM=V IN Load Transient Response PSAVE Time (100us/div) Condition V =3.6V, V =1.8V, l =1A to 100 mA, IN OUT OUT SYNC/PWM=GND © 2006 Semtech Corp. Load Transient Response PWM EN (2V/div) V (1V/div) OUT l (100mA/div) IN Condition V =3.6V VID Code Change V (100mV/div) OUT I (1A/div) ...
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... Flag from uProc Changes voltage from 1. 1.0V with Forced PWM and no 100% Duty Cycle OUT V IN 2. 10μF © 2006 Semtech Corp. SC194A VIN LX EN 4.7μH SYNC/PWM VOUT VID0 VID1 PGND MODE GND L1 SC194A ...
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... POWER MANAGEMENT Outline Drawing - MLP-10 A PIN 1 INDICATOR (LASER MARK) aaa C LxN NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS. © 2006 Semtech Corp DIM aaa bbb A SEATING PLANE bxN bbb SC194A PRELIMINARY DIMENSIONS INCHES MILLIMETERS ...
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... POWER MANAGEMENT Land Pattern - MLP-10 H (C) X NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR 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 ...