SC192IMLTRT Semtech

SC192 Synchronous Buck Converter with Integrated Power Devices POWER MANAGEMENT Description Features The SC192 is a synchronous step-down converter with 2.7V to 7V Input Range Output Adjustable from 0.75V to Vin integrated power devices designed for battery operated systems. The internal power switches reduce system Fixed Frequency or PSAVE for Maximum Efficiency Over Wide Load Current Range size and cost. In addition, an efficiency of 95% can be 700mA Guaranteed Output Current achieved for significant line and load ranges. The SC192 is designed for single-cell Li-Ion battery applications, but No Schottky Diode Required also performs well in fixed 3.3V or 5V input circuits. 35 A Quiescent Current 100% Duty Cycle in Dropout The SC192 has a flexible clocking scheme. It can be 95% Efficiency synchronized to an external oscillator, fixed to the inter- Fast Transient Response nal oscillator, or allowed to modulate the frequency dur- Over Temperature Protection ing light loads (PSAVE) for maximum battery life, by the Space-saving Micro Lead-Frame Package method called pulse frequency modulation (PFM). Shut- MLPD-10 3x3 down places the switches in a high impedance state and turns off all control circuitry to achieve a typical quies- Applications cent current of 0.1A. Cell Phones Cordless Phones Line and load regulation is to +/-0.5% of the output volt- Notebook and Subnotebook Computers age. The internal MOSFET switches provide >1A peak PDAs and Mobile Communicators current to provide a DC output of at least 700mA. Grounding the ILIM pin reduces the current limit by half. 1 Li-Ion or 3 NiMH/NiCd Powered Devices The SC192 can achieve 100% duty cycle for excellent low dropout performance and comes in a tiny MLPD-10, 3 x 3 package having a maximum height of 1mm. Typical Application Circuit SC192 L1 Vout = 0.75V to Vin Vin = 2.7V to 7V 1 9 LX VIN C1 R1 8 C5 EN 5 C6 ADJ 6 ILIM R2 10 PGND 2 7 BP SYNC/PWM C4 C3 R8 34 GND COMP Revision 8, March 26, 2007 1 www.semtech.comSC192 POWER MANAGEMENT PRELIMINARY Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Plarameter Smymbo Msaximu Unit VVIN input -0.3 t-V0.3ot 7o.75 IN SVYNC/PWM Input -0.3 t-V0.3ot 7o .75 SYNC EVN Input -0.3 t-V0.3ot 7o .75 EN PVGND to GND -V0.3 to 0.3 PGDN LVX Voltage -V1 to VIN +1 LX IVLIM Voltage -V0.3 to VIN + 0.3 ILIM AVDJ Voltage -V0.3 to VIN + 0.3 ADJ CVOMP Voltage -V0.3 to VIN + 0.3 COMP BVP Voltage VVIN - 0.3 to VIN + 0.3 BP Thermal Impedance Junction to Ambient *57 C/W JA Otutput Short Circuit to GND Csontinuous SC LIX Current +A1.6 LX Peak IR Reflow Temperature SC192IMLTR (Soldering) 10s - 30s T 240 C LEAD SC192IMLTRT (Soldering) 20s - 40s 260 STtorage Temperature -65 to +160 C S * Tied to PCB with 1 square inch, 2 ounce copper. Note: This device is ESD sensitive. Use of ESD handling precautions is required. Electrical Characteristics Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, ILIM = VIN, EN = VIN, T =-40 to 85C. Typical values are at T = +25C. A A Plarameter Ssymbo Cnondition Mpi Txy Msa Unit 7 IVnput Voltage Range 25.7 5V. IN AVDJ Regulation Voltage 05.73109.7 0V.76 ADJ AIDJ Input Current A0DJ = 0.75V -05 5A0 n ADJ OVutput Voltage Adjust Range V V V OUT ADJ IN LGine Regulation RE -50.5 +%0. LINE (1) Load Regulation REG Peak Inductor Current = 060%. LOAD 0 to 700mA PR-Channel On Resistance I=3200mA 0. DSP LX NR-Channel On Resistance I=4200mA 0. DSN LX 2007 Semtech Corp. 2 www.semtech.com