SEMTECH SC189

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  <1µA 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 +85°C 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 1µA.  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 1µH Chip V LX V VIN OUT IN 1.20V/1.5A 2.9V to 5.5V C IN C VOUT EN OUT 10µF 22µF C SC189 OUT C IN 0805 GND 0603 Actual Size 1 www.semtech.com August 27, 2010 SC189 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) θ = 60°C/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) θ = 90°C/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 SC189 Absolute Maximum Ratings Recommended Operating Conditions VIN Supply Voltage ……………………………… 2.9 to 5.5V VIN Supply Voltage ……………………………… -0.3 to 6.0V (3) Maximum Output Current …………………………… 1.5A LX Voltage ………….. -1 to V +1V, -3V (20ns Max), 6V Max IN VOUT Voltage ……………………………… -0.3 to V +0.3V IN Thermal Information EN Voltage …………………………………. -0.3 to V +0.3V IN (1) Thermal Resistance, Junction to Ambient Peak IR Reflow temperature …………………………. 260°C MLPD-UT6 Package ……………………………… 60°C/W (2) ESD Protection Level …………………………………. 3kV SOT23-5 Package ……………………………… 90°C/W Operating Junction Temperature …………… -40 to +125˚C Maximum Junction Temperature …………………… +150°C Storage Temperature Range ………………… -65 to +150 °C Exceeding the absolute maximum ratings may result in permanent damage to the device and/or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. 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 ( for SOT23- 5 package) with copper of 1oz for each layer. (2) Tested according to JEDEC standard JESD22-A114-B. (3) For SOT23-5 package, the limit of the maximum power dissiption shown in figure 2 may reduce the maximum output current. Electrical Characteristics Unless specified: V = 5.0V, C =10µF, C =10µF; L=2.2µH; -40°C