G5193 Global Mixed-mode Technology High Efficiency, 3A Output, Synchronous Step Down Features General Description Two 45mΩ (typical) MOSFETs for high efficiency at 3A loads 300kHz to 2MHz Switching Frequency 0.827V±1% Voltage Reference Over Temperature Synchronizes to External Clock Adjustable Soft Start UV and OV Power Good Output Low Operating and Shutdown Quiescent Current Safe Start-up into Pre-Biased Output Cycle by Cycle Current Limit, Thermal and Frequency Fold Back Protection Thermally Enhanced 3mm × 3mm 16-pin QFN The G5193 device is a full featured 5.5V, 3A synchronous step down current mode converter with two integrated MOSFETs. The G5193 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2MHz switching frequency, and minimizing the IC footprint with a small 3mm x 3mm thermally enhanced QFN package. The G5193 provides accurate regulation for a variety of loads with an accurate ±1% Voltage Reference (VREF) over temperature. Efficiency is maximized through the integrated 45mΩ MOSFETs and 350µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2µA by entering a shutdown mode. Applications Low-Voltage, High-Density Power Systems Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and Microprocessors Broadband, Networking and Optical Communication Infrastructure Under voltage lockout is internally set at 2.6V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage startup ramp is controlled by the soft start pin. An open drain power good signal indicates the output is within 93% to 107% of its nominal voltage. Ordering Information ORDER NUMBER Marking TEMP. RANGE PACKAGE (Green) G5193R41U 5193 -40°C to +85°C TQFN3X3-16 G5193R41D 5193 -40°C to +85°C TQFN3X3-16 Frequency fold back and thermal shutdown protects the device during an over-current condition. Note: R4: TQFN3X3-16 1: Bonding Code U & D: Tape & Reel VIN EN PG BS 15 14 13 2 7 8 RT 4 COMP GND 6 3 VIN 3.3V to 5.5V 11 Thermal Pad FB GND Typical Application Circuit 12 5 VIN 1 AGND VINA 16 Pin Configuration LX R5 100KΩ LX 9 SS G5193 VIN CI 10µF C2 0.1µF EN PG CSS 0.01µF RT 182KΩ CZ* G5193 TQFN3X3-16 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. BS LX R4 32.4KΩ LX 10 R3 48.7KΩ SS RT COMP FB (0.827V) CBS 0.1µF LO 1.0µH CO 22*2µF VOUT 1.8V CD* R1 100KΩ R2 80KΩ GND AGND EP RC 20KΩ CC 470PF ＊ Option ＊ VINA must connect to VIN TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Jul 18, 2012 1