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TLF50281EL

The TLF50281EL is a high frequency PWM step-down DC/DC converter with an integrated PMOS power switch, packaged in a small PG-SSOP-14 with exposed pad. The wide input voltage range from 4.75 to 45 V makes the TLF50281EL suitable for a wide variety of applications. The device is designed to be used under harsh automotive environmental conditions. The switching frequency of nominal 2.2 MHz allows the use of small and cost-effective inductors and capacitors, resulting in a low, predictable output voltage ripple and in minimized consumption of board space. In light load condition the device operates in Pulse Frequency Modulation (PFM) to optimize the efficiency. Between the single pulses, all internal controlling circuitry is switched off to reduce the internal power consumption. The voltage regulation loop provides an excellent line and load regulation, the stability of the loop is ensured by an internal compensation network. This compensation network combined with a current mode regulation control guarantees a highly effective line transient rejection. During start-up the integrated soft-start limits the in rush current peak and prevents from an output voltage overshoot. The TLF50281EL includes protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. The enable function, in shutdown mode with less than 2 μA current consumption, enables easy power management in battery-powered systems. In addition, the TLF50281EL is providing a reset output with adjustable threshold and a timeout watchdog with adjustable timing to monitor and control the µC.

Parametric TLF50281EL Comments Asyncronous low-Iq-Buck; 5V/500mA; Iq<45µA; f=2,2MHz; 100%DC; EN, RES, WD VQ (multiple) 5V IQ  max 500.0mA Iq 45.0µA Regulator Type DC/DC->Buck Tolerance 2% Watchdog yes Protect Y Reset yes Inhibit Y Operating Temperature  min  max -40.0°C  150.0°C Mounting SMT Sales Product Name TLF50281EL OPN TLF50281ELXUMA1 Product Status active and preferred Package Name PG-SSOP-14 Completely lead free yes Halogen free yes RoHS compliant yes Packing Size 2500 Packing Type TAPE & REEL Moisture Level 3

Summary of Features: 500 mA step down voltage regulator 5 V Output voltage ± 2% output voltage tolerance Low quiescent current (less than 45μA at nominal battery voltage) Current mode PWM regulation PFM mode for light load current Input voltage range from 4.75V to 45V Integrated power transistor 2.2 MHz switching frequency 100% Duty cycle Synchronization input Very low shutdown current consumption (<2 μA) Integrated compensation Integrated soft-start function Reset generator with adjustable threshold Watchdog with adjustable timing Input undervoltage lockout Suited for automotive applications: Tj = -40 °C to +150 °C Green Product (RoHS compliant) AEC Qualified Benefits: Low current consumption for permanently Vbat-connnected systems High switching frequency reduces value and size of coil and output capacitor Low drop-out operation due to 100% DC No external components required for compensation and soft-start Flexibility in setting reset threshold Flexibility in setting watchdog timing

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