SC4626 2.5MHz, 1A Synchronous Step Down Regulator in SOT23-5 POWER MANAGEMENT Features Description V Range: 2.9 5.5V The SC4626 is a high efficiency, synchronous step-down IN regulator providing up to 1A output current in a SOT23- V Options: 1.0 - 3.3V OUT 5 package. The device requires only three external filter Up to 1A Output Current components for a complete step-down regulator solution. 2.5MHz Switching Frequency The input voltage range is 2.9 to 5.5V with either factory programmed outputs from 1.0 to 3.3V or adjustable Efficiency Up to 93% output via an external resistor divider. Low Output Noise Across Load Range The converter operates at fixed 2.5MHz switching Excellent Transient Response frequency allowing small L/C filtering components. Start Up into Pre-Bias Output The voltage mode architecture is compatible with chip inductors and capacitors for minimum PCB footprint and 100% Duty-Cycle Low Dropout Operation lowest overall system cost. <1A Shutdown Current Internal Soft Start Up to 93% efficiency is achieved with low R internal DS(ON) switches. PWM constant frequency operation ensures Input Under-Voltage Lockout low output ripple across the load range. 100% duty-cycle Output Over-Voltage, Current Limit Protection provides 300mV dropout voltage at 1A which extends the minimum input voltage for 2.5V and 3.3V outputs. Over-Temperature Protection Excellent transient response is achieved with no external Adjustable Output Voltage compensation components. SOT23-5 Package The SC4626 provides input under-voltage, output over- Fully WEEE and RoHS Compliant voltage, output short circuit and over-temperature 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 DSC and PMPs The SC4626 is available in a SOT23-5 package. GPS Devices xDSL Systems POL Regulators Portable HDD Wireless LAN Typical Application Circuit L 2.2H V LX VIN V OUT IN 1.20V/1A 2.9V to 5.5V C IN C OUT 10F GND 10F Enable EN VOUT SC4626C 1 www.semtech.com August 27, 2010SC4626 Pin Configuration Ordering Information Device Package & Description (2)(3)(4) SC4626xSKTRT SOT23-5 (TOP VIEW) Evaluation Board - Standard (5) SC4626xEVB Size (i.e., Wire Wound Inductor) 1 5 VIN LX Evaluation Board - Small Size (5) SC4626xEVB-1 (i.e., Chip Inductor) Notes: GND 2 (1) Measured in free convection, mounted on 10mm x 10mm, 2 layer FR4 PCB shown in figure 4 with copper of 1oz for each layer. (2) Available in tape and reel only. A reel contains 3,000 devices. (3) Device is Pb-free, Halogen free, and RoHS/WEEE compliant. 3 4 EN VOUT (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 SC4626CSKTRT. (5) x is the code of the output voltage. See Table 1 for the code. For example, the EVB for VOUT= 1.20V is SC4626CEVB (Standard Size) or SC4626CEVB-1 SOT23-5 (Small Size). (1) = 90C/W JA Marking Information Table 1: Available Output Voltages (1) Code VOUT A 1.00 C 1.20 E 1.28 x F 1.30 H 1.50 L 1.80 Y 2.50 Z 3.30 Notes: (1) Contact factory for unavaliable output voltage options. Marking for SOT23, 5 Lead Package: x = Code of the output voltage (Example: C for VOUT=1.20V) yyww = Datecode (Example: 0852) 2009 Semtech Corp. www.semtech.com 2