SC185 4A Synchronous Step-Down Regulator POWER MANAGEMENT Description Features V Range: 2.9 5.5V The SC185 is a 4A synchronous step-down regulator IN designed to operate with an input voltage range of V Options: 1.0V to 3.3V OUT 2.9V to 5.5V. The device requires only three external Up to 4A Output Current filter components for a complete a step down regulator Ultra-Small Footprint, <1mm Height Solution solution. The output voltage is factory predetermined 1.5MHz Switching Frequency with an available range of 1.0V to 3.3V. Optional Power Save Mode Operation The SC185 is optimized for maximum efficiency over a Efficiency Up to 95% wide range of load currents. During full load operation, Low Output Noise Across Load Range the SC185 operates in PWM mode with fixed 1.5MHz Excellent Transient Response oscillator frequency, allowing the use of small surface Start Up into Pre-Bias Output mount external components. As the load decreases, the 100% Duty-Cycle Low Dropout Operation regulator has the option to transition into Power Save <1A Shutdown Current mode maintaining high efficiency or stay in forced PWM mode operation. Externally Programmable Soft Start Time Power Good indicator The SC185 offers output short circuit and thermal Input Under-Voltage Lockout protection to safe guard the device under extreme Output Over-Voltage, Current Limit Protection operating conditions. The enable pin provides on/off Over-Temperature Protection control of the regulator. When connected to logic Fixed VOUT version low, the device enters shutdown and consumes less 3mm x 3mm x 0.6mm thermally enhanced than 1uA of current. Other protection features include MLPQ-UT16 package programmable soft start with Power Good indicator, over -40 to +85C Temperature Range voltage protection and under voltage lockout. Pb-free, Halogen free, and RoHS/WEEE compliant The SC185 is available in a thermally-enhanced, 3mm Applications x 3mm x 0.6mm MLPQ-UT16 package and has a rated Desktop Computing temperature range of -40 to +85C. Set-Top Box LCD TV Network Cards Printer Typical Application Circuit L, 1.0H 14,15,16 1,2 V V LX PVIN IN OUT 1.5V C R IN 1 C SC185H OUT 22F 1 47F 4 AVIN C 10 1 VOUT 0.1F 7 PGOOD PGOOD 6 Enable EN 11,12,13,T 5 PGND Mode MODE 3 9 AGND SS C SS 1 www.semtech.com June 18, 2010SC185 Pin Configuration Ordering Information Device Package (2)(3)(4) SC185xULTRT 3mm x 3mm x 0.6mm MLPQ-UT16 16 15 14 13 (5) SC185xEVB Evaluation Board Notes: PGND 12 1 PVIN (1) Calculated from package in still air, mounted to 3 x 4.5, 4 layer TOP VIEW FR4 PCB with thermal vias under the exposed pad per JESD51 PGND 11 standards. 2 PVIN (2) Available in tape and reel only. A reel contains 3,000 devices. (3) Device is Pb-free, Halogen free, and RoHS/WEEE compliant. VOUT 10 3 AGND (4) x is the code of the output voltage. See Table 1 for the code. For T example, the device number for VOUT= 1.50V is SC185HULTRT. 9 SS 4 AVIN (5) x is the code of the output voltage. See Table 1 for the code. For example, the EVB with VOUT= 1.50V is SC185HEVB. 5 6 8 7 3mm x 3mm x 0.6mm MLPQ-UT16 (1) = 40C/W = 7C/W JA JC Table 1: Available Output Voltages Marking Information (6) Code VOUT B 1.00 E 1.20 H 1.50 185x J 1.80 yyww L 2.50 Q 3.30 nnnn Notes: (6) Contact factory for alternative output voltage options. Marking for 3mm x 3mm MLPQ-UT 16 Lead Package: x = Code of the output voltage (Example: H for VOUT=1.50V) yyww = Datecode (Example: 0852) nnnn = Semtech Lot number (Example: E901) 2010 Semtech Corp. www.semtech.com 2 LX MODE LX EN LX PGOOD PGND NC