TMI3255

TMI3255 600kHz, 18V, 5A Synchronous COT Step-Down Converter Features Description ⚫ 45mΩ/25mΩ Low RDS(ON) internal FETs The TMI3255 is a high efficiency 600kHz, Constant ⚫ High Efficiency Synchronous-Mode on-Time (COT) control mode synchronous step- Operation down DC-DC converter capable of delivering up to 5A current. TMI3255 integrates main switch and ⚫ Wide Input Range: 4.5V to 18V ⚫ Feedback Voltage Accuracy 0.8V±2% ⚫ 600kHz Switch Frequency ⚫ Up to 5A Output Current size are achieved with 600kHz switching frequency. ⚫ COT control to achieve fast transient It adopts the COT architecture to achieve fast responses transient responses for high voltage step down ⚫ Power Save Mode at Light Load applications. ⚫ Integrated internal compensation The TMI3255 requires a minimum number of ⚫ Stable with Low ESR Ceramic Output readily available standard external components Capacitors and is available in a 6-pin DFN2x2-6FC ROHS synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor ⚫ Over Current Protection with Hiccup Mode ⚫ Thermal Shutdown ⚫ Inrush Current Limit and Soft Start ⚫ Build in Input Over Voltage Protection ⚫ Available in DFN2x2-6FC Package compliant package. Application ⚫ Digital Set Top Boxes ⚫ Flat Panel Television and Monitors ⚫ Notebook computer ⚫ Wireless and DSL Modems Typical Application Efficiency VOUT=3.3V, IOUT=1mA to 5A, TA=25°C 20Ω R4 C4 0.1µF 100% L BS CIN1 CIN2 22µF 100nF 90% VOUT= 3.3V LX R3 100kΩ 80% R1 39kΩ Cfb 20pF EN FB GND CO1 R2 12.5kΩ 22µF CO2 CO3 22µF 22µF TMI3255 Typical Application Circuits Efficiency VIN 3.3µH 70% 60% 50% 40% 9V-3.3V 30% 12V-3.3V 20% 0.001 16V-3.3V 0.01 0.1 1 10 Output Current (A) TMI and SUNTO are the brands of TOLL microelectronic TMI3255 V0.2 – 2020.07 www.toll-semi.com 1 TMI3255 Absolute Maximum Ratings (Note 1) Parameter Min Max Unit Input Supply Voltage, EN -0.3 20 V LX Voltages -0.3 20 V LX Voltages (