G5172 Global Mixed-mode Technology High Efficiency, 4A Output, Synchronous Step Down Features General Description Two 30mΩ (typical) MOSFETs for high efficiency at 4A loads 200kHz to 2MHz Switching Frequency 0.8V ± 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 and 4mm × 4mm 16-pin QFN Package QFN4x4 Loads can attain to 5A The G5172 device is a full featured 6.0V, 4A synchronous step down current mode converter with two integrated MOSFETs. The G5172 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 (4mm x 4mm) thermally enhanced QFN package. The G5172 provides accurate regulation for a variety of loads with an accurate ±1% Voltage Reference (VREF) over temperature. Efficiency is maximized through the integrated 30mΩ 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 G5172R41U G5172R41D 5172 5172 -40°C to +85°C TQFN3X3-16 -40°C to +85°C TQFN3X3-16 G5172R81U 5172 -40°C to +85°C Frequency fold back and thermal shutdown protects the device during an over-current condition. PACKAGE (Green) TQFN4X4-16 Note: R4: TQFN3X3-16 R8:TQFN4X4-16 1: Bonding Code U & D: Tape & Reel Pin Configuration Typical Application Circuit VINA 1 VIN 2 3 BS 13 PG 14 EN VIN 3.3V to 6.0V 12 LX 11 LX 10 4 R5 100KΩ R3 48.7KΩ G5172 VIN CI 10µF C2 0.1µF R4 32.4KΩ EN PG SS RT COMP 8 SS CSS 0.01µF RT 182KΩ CZ* TQFN3X3-16/TQFN4X4-16 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. BS LX LX RT 7 COMP AGND 6 9 5 GND Thermal Pad FB GND 15 16 VIN G5172 FB (0.803V) 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: 0.9 Jul 18, 2012 1 G5174 Global Mixed-mode Technology Inc. High Efficiency, 4A Output, Synchronous Step Down Features General Description Two 30mΩ (typical) MOSFETs for high efficiency at 4A loads 200kHz to 2MHz Switching Frequency 0.8V ± 1% Voltage Reference Over Temperature Synchronizes to External Clock Adjustable Soft Start 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 TSSOP-14 (FD) The G5174 device is a full featured 5.5V, 4A synchronous step down current mode converter with two integrated MOSFETs. The G5174 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 thermally enhanced TSSOP-14 (FD) package. The G5174 provides accurate regulation for a variety of loads with an accurate ±1% Voltage Reference (VREF) over temperature. 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 Efficiency is maximized through the integrated 30mΩ MOSFETs and 350µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2µA by entering a shutdown mode. 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. Ordering Information ORDER NUMBER Marking G5174FA1U G5174 TEMP. RANGE PACKAGE (Green) Frequency fold back and thermal shutdown protects the device during an over-current condition. -40°C to +85°C TSSOP-14 (FD) Note: FA :TSSOP-14 (FD) 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit G5174 FB VIN 3.3V to 5.5V 14 1 COMP 2 13 AGND RT 3 12 GND SS Thermal Pad 4 11 VINA GND R3 48.7Ω CI 10µF R4 32.4Ω BS EN LX FB (0.803V) VIN LX 5 10 VINA LX 6 9 VIN BS 7 8 EN G5174 VIN CSS 0.01µF RT 182KΩ C Z* TSSOP-14 (FD) Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. SS RT COMP 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 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Nov 17, 2010 1