TI TPS40195PWR

TPS40195 is a flexible synchronous buck controller that operates from a supply voltage rated at 4.5V to 20V. This controller implements voltage-mode control via an adjustable switching frequency ranging from 100kHz to 600kHz. Flexible features of this device include selectable soft-start time, programmable short-circuit limiting, programmable UVLO, and synchronization capability. An adaptive anti-cross-conduction scheme is employed to prevent shoot-through current in the power FETs. Overcurrent detection is achieved by sensing the voltage drop across the low-side MOSFET (when on) and comparing it against a user-programmed threshold. This threshold is set by a single external resistor connected from ILIM to GND. Cycle-by-cycle current limiting (to prevent current runaway) is provided by sensing the voltage across the high-side MOSFET (when on) and terminating the cycle when the voltage drop exceeds a fixed threshold of 550mV. If the controller detects an output short circuit, it shuts down both MOSFETs and attempts a restart after the timeout period expires. This enables limited power dissipation under sustained fault conditions. The synchronization feature on this device is bidirectional. The device can synchronize 180° out of phase to a selected master device TPS40195 (operating at a fixed frequency of 250kHz or 500kHz), or it can synchronize to an external clock source (any frequency within the range of 100kHz to 600kHz).

• Input operating voltage range: 4.5V to 20V
• Output voltage as low as 0.591V ±0.5%
• 180° dual-phase out-of-phase synchronous operation
• Internal 5V regulator
• High-side and low-side overcurrent sensing MOSFETs
• 100kHz to 600kHz switching frequency
• Enable pin and power-good indication
• Programmable UVLO with hysteresis
• Thermal shutdown at 150°C
• Optional soft-start
• Pre-biased output protection

• Digital TV
• Entry-level and mid-range servers
• Network equipment
• Non-isolated DC/DC modules