2.2 MHz Step-Down Regulator 500 mA, 5 V, low quiescent current
Qualified for automotive applications. Product Validation according to AEC-Q100/101.
The TLF50251EL 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 V to 45 V makes
the TLF50251EL 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
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
The TLF50251EL includes protection features such as a cycle-by-cycle current limitation, overtemperature
shutdown and input undervoltage lockout. The enable function, in shutdown mode with less than 2 µA
current consumption, enables easy power management in battery-powered systems.
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 inrush current peak and prevents output voltage overshoot.