Infineon Technologies AG DC-DC Converters, Switching Regulators TLF51801ELV

The TLF51801ELV is a PWM step-down DC/DC controller with external power switches, packaged in a small, thermal enhanced PG-SSOP-14 with exposed pad.

The regulator is capable to drive external power-stages (n/n-MOS) for loads up to 10 A. The current limitation function is using either the Rdson of the HS-switch or a external shunt resistor. The output voltage with a 2% tolerance is adjustable. The device can run with a duty cycle larger than 99%. The bootstrap diode is integrated to save external components. The switching frequency can be set between 100 kHz and 700 kHz or can be synchronized to an external clock. During start-up the integrated soft-start limits the in rush current peak and prevents from an output voltage overshoot. The enable function, in shutdown mode with less than 2 μA current consumption, enables easy power management in battery-powered systems. The TLF51801ELV includes protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. With a temperature range Tj from -40°C to 150°C the device is suitable for harsh environment of automotive applications

Summary of Features

• Controller for loads up to 10A
• Driving external power-stage (n/n-MOS)
• Current limitation using the Rdson of the HS-switch or via shunt-resistor
• Adjustable output voltage: 1.2V up to Dmax*Vs
• ± 2% output voltage tolerance
• Duty cycle > 99%
• Integrated bootstrap diode
• Input voltage range from 4.75V to 45V
• Adjustable switching frequency: 100 kHz up to 700 kHz
• Syncronization input
• EN for ultra-low shut-down current (< 2 µA)
• Integrated soft-start function
• Suited for automotive applications: Tj = -40 °C to +150 °C
• Green Product (RoHS compliant)
• AEC Qualified

Benefits

• Rdson-current limitation saves external shunt resisitor and board space
• Integrated bootstrap diode saves external components and board space
• High duty cycle allows low drop-out operation
• Integrated soft- start function saves external components and board space

Potential Applications

• General purpose
• Pre-regulator

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