Solved by 6652sp TM 1A, High Efficiency, Fixed 1.4 MHz Current Mode PWM Buck Regulator Features 10 P 1 LX GND 1A Output Current 9 S 2 P GND VIN SP6652 1.4MHz Constant Frequency Operation FB 3 8 S VIN 97% Efficiency Possible 10 Pin DFN COMP 4 7 SYNC 0.5A (Max.) Shutdown Current 6 MODE SD 5 Adjustable Output Voltage No External FETs or Schottky Diode Required Uses Small Value Inductors and Ceramic tionsapplica Output Capacitors Mobile Phones Low Dropout Operation: 100% Duty Cycle PDAs Soft Start and Thermal Shutdown Protection DSCs Easy Frequency Synchonization MP3 Players USB Devices Lead Free, RoHS Compliant package: l Point of Use Power Small (3mm X 3mm) 10 Pin DFN or MSOP Description The SP6652 is a high efficiency, synchronous buck regulator ideal for portable applications using one Li-Ion cell, with up to 1A of output current. The 1.4MHz switching frequency and PWM control loop are optimized for a small value inductor and ceramic output capacitor, for space constrained portable designs. In addition, the input voltage range of 2.7V to 5.5V excellent transient response, output accuracy, and ability to transition into 100% duty cycle operation -- further extending useful battery life -- make the SP6652 a superior choice for a wide range of portable power applications. A logic level shutdown control, external clock synchronization, and forced-PWM or automatic control inputs are provided. Other features include soft-start, over current protection and 140C over-temperature shutdown. typical tion applica circuit Oct10-07 RevJ SP6652 1A, High Efficiency, Current Mode PWM Buck Regulator 2007 Sipex Corporation ABSOLUTE MAXIMUM RATINGS PV ,S ...........................................................................-0.3V to 6.0V These are stress ratings only and functional operation of the device at IN VIN P to S .....................................................................-0.3V to 0.3V these ratings or any other above those indicated in the operation sec- GND GND LX to P .............................................................. - 0.3V to P +0.3V tions of the specifications below is not implied. Exposure to absolute GND VIN Storage Temperature ....................................................-65 C to 150 C maximum rating conditions for extended periods of time may affect Operating Temperature .................................................. -40C to +85C reliability. electrical cHaracteristics V = UV = V = 3.6V, I = 0mA, T = -40C to +85C, typical values at 27C unless otherwise noted. IN IN SDN O AMB The denotes the specifications which apply over the full temperature range, unless otherwise specified. PARAMETER MIN typ MAX units Dcon itions Result of I measurement at V = P Q IN VIN Input Operating Voltage 2.85 5.5 V = 5.5V FB Set Voltage 0.784 0.8 0.816 V FB Set Current - 0.0 A V = 0.8V FB Overall FB Accuracy -4 4 % FB = COMP Switching Frequency 4 .6 MHz Mode = SD = V IN Minimum On-Time-Duration 180 230 ns V = 1.0V, V = 0.2V FB COMP SYNC Tracking Frequency .0 .0 MHz Mode = SD = V , V =1.0V IN FB SYNC Input Current - 0.0 A SYNC Logic Threshold Low 0.3 0.6 V High to Low Transition SYNC Logic Threshold High .7 V Low to High Transition PMOS Switch Resistance 0.4 0.6 I = 200mA PMOS NMOS Switch Resistance 0.4 0.6 I = 200mA NMOS Inductor Current Limit 1.3 .5 .7 A V = 0.4V, Mode = SD = V FB IN LX Leakage Current -3 0. 3 A SD = ZeroV V = 3.6V, Mode = SD = V 5 mA IN IN V Quiecent Current IN 3 0 mA V = 5.5V, Mode = SD = V IN IN UVLO Undervoltage Lockout Threshold, .55 .7 2.85 V SD = V IN V falling IN UVLO hysteresis 6 % Soft Start Current 4 A SD = V , V = 1V IN COMP SD MODE Input Current - 0.0 A 0.9 V High to Low Transition SD MODE Input Threshold Voltage 0.6 . 5 1.8 V Low to High Transition Slope Compensation 700 mA/S 40 Rising Over-Temperature Trip Point C Over-Temperature Hysteresis 4 C mA/V Error Amplifier Transconductance Oct10-07 RevJ SP6652 1A, High Efficiency, Current Mode PWM Buck Regulator 2007 Sipex Corporation