SC189 2.5MHz, 1.5A Synchronous Step Down Regulator POWER MANAGEMENT Features Description V Range: 2.9 5.5V The SC189 is a high efficiency, synchronous step-down IN regulator providing up to 1.5A output current in either V Options: 1.0 - 3.3V OUT an ultra-small 2mm x 2mm, low profile package or a low Up to 1.5A Output Current cost SOT23-5 package. The device requires only three external filter components for a complete step down Ultra-Small Footprint, <1mm Height Solution regulator solution. The input voltage range is 2.9 to 5.5V 2.5MHz Switching Frequency with either factory programmed outputs from 1.0 to 3.3V or adjustable output via an external resistor divider. Efficiency Up to 93% Low Output Noise Across Load Range The converter operates at fixed 2.5MHz switching Excellent Transient Response frequency allowing small L/C filtering components. The voltage mode architecture is compatible with chip Start Up into Pre-Bias Output inductors and capacitors for minimum PCB footprint and 2 100% Duty-Cycle Low Dropout Operation lowest overall system cost. Total footprint of 25mm can be achieved - making the SC189 the ideal solution for <1A Shutdown Current high density systems. Solution height of <1mm is also Internal Soft Start possible. Input Under-Voltage Lockout Up to 93% efficiency is achieved with low R internal DS(ON) Output Over-Voltage, Current Limit Protection switches. PWM constant frequency operation ensures low output ripple across the load range. 100% duty-cycle Over-Temperature Protection provides 360mV dropout voltage at 1.5A which extends Adjustable Output Voltage the minimum input voltage for 2.5V and 3.3V outputs. Excellent transient response is achieved with no external Available in SOT23-5 package and 2mm x 2mm x compensation components. 0.6mm thermally enhanced MLPD-UT6 package -40 to +85C Temperature Range The SC189 provides input under-voltage, output over- voltage, output short circuit and over-temperature Fully WEEE and RoHS Compliant protection to safeguard the device and system under fault conditions. The regulator provides integrated soft-start to minimize inrush currents. Standby quiescient current is Applications less than 1A. Bluetooth Radios The SC189 is available in SOT23-5 and a thermally DSC and PMPs enhanced 2mm x 2mm x 0.6mm MLPD-UT6 package. GPS Devices xDSL Systems POL Regulators Portable HDD Wireless LAN Typical Application Circuit 2 Total PCB Area ~25mm L L SC189C 1H Chip V LX V VIN OUT IN 1.20V/1.5A 2.9V to 5.5V C IN C VOUT EN OUT 10F 22F C SC189 OUT C IN 0805 GND 0603 Actual Size 1 www.semtech.com August 27, 2010SC189 Pin Configuration Ordering Information Device Package & Description (2)(3)(4) SC189xULTRT 2mm x 2mm x 0.6mm MLPD-UT6 1 6 VOUT NC TOP VIEW 2)(3)(4) SC189xSKTRT SOT23-5 2 5 GND EN Evaluation Board for MLPD-UT6 (5) T SC189xEVB - Standard Size 3 4 LX VIN (i.e., Wire Wound Inductor) Evaluation Board for MLPD-UT6 2mm x 2mm x 0.6mm MLPD-UT6 (5) SC189xEVB-1 - Small Size (1) = 60C/W JA (i.e., Chip Inductor) Evaluation Board for SOT23-5 (5) SC189xEVB-2 - Standard Size 1 5 VIN LX (i.e., Wire Wound Inductor) TOP VIEW Evaluation Board for SOT23-5 GND 2 (5) SC189xEVB-3 - Small Size (i.e., Chip Inductor) 3 4 EN VOUT Notes: (1) Measured in free convection, mounted on 10mm x 10mm, 2 layer FR4 PCB shown in figure 7 ( for MLPD-UT6 package) and figure 8 ( SOT23-5 for SOT23-5 package) with copper of 1oz for each layer. (1) = 90C/W JA (2) Available in tape and reel only. A reel contains 3,000 devices. (3) Available in lead-free package only. Device is WEEE and RoHS Marking Information compliant. (4) x is the code of the output voltage. See Table 1 for the code. For example, the device number for VOUT= 1.20V is SC189CULTRT. (5) x is the code of the output voltage. See Table 1 for the code. For example, the EVB for MLPD-UT6 package with VOUT= 1.20V is FLx SC189CEVB (Standard Size) or SC189CEVB-1 (Small Size). Table 1: Available Output Voltages Code Code (1) VOUT for MLPD-UT6 for SOT23-5 Marking for 2mm x 2mm MLPD-UT 6 Lead Package: x = Code of the output voltage (Example: C for VOUT=1.20V) A A 1.00 oyw = Pin 1 and Datecode (Reference Package Marking Design Guidelines, Appendix A) B B 1.10 C C 1.20 Top Mark Bottom Mark E Not Available 1.28 Not Available F 1.30 H H 1.50 L L 1.80 x 189 Not Available N 2.00 T Y 2.50 Not Available V 2.70 Marking for SOT23, 5 Lead Package: Z Z 3.30 x = Code of the output voltage (Example: C for VOUT=1.20V) Notes: yyww = Datecode (Example: 0852) (1) Contact factory for unavaliable output voltage options. 2009 Semtech Corp. www.semtech.com 2