TPS2111APWG4

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The TPS2111APWG4 is a low threshold synchronous rectifier controller designed to improve the efficiency of synchronous buck regulator systems. It is categorized as a PMIC (power management IC), OR controllers, and Ideal Diodes.

It is a synchronous rectifier controller that provides the power conversion efficiency improvement required in the DC-DC converter systems. The synchronous rectifier controller works by monitoring the input voltage, the output voltage, and the inductor current. It then adjusts the timing of the synchronous rectifier to prevent voltage drops across the body diode, ensuring optimal power conversion efficiency.

The device provides control inputs for both output enable (OE) and sync enable (SE). The OE control input can be pulled down with an external capacitor to enable switching at normal output voltages as low as 0.8 V. The SE control input input has a dead zone delay of 900 ns to ensure output failure protection. This circuit feature minimizes the inrush current when the device is enabled.

The device also includes five PMOS gate controlled outputs, including programmable current limiting (CL), gate drive (GD), mode control (MC), fault output (FO), and gate reset (GR). CL is a detection input that enables an external circuit to measure the total current in the system and set a current limit. The GD output is connected to a boost PMOS. When this output is driven High, the boost PMOS is turned off and the input voltage is fed back into the supplies. The MC output is used to control the gate-on time for the boost PMOS and the low side MOSFET, allowing precise current control. The FO output is used to detect fault conditions such as output-voltage overshoot and soft-start conditions, and the GR output is used to reset the gate drive after a fault condition has been identified.

The device includes an internal reference voltage generator circuit and an internal temperature sensor, providing adjustable VREF and an indication of junction temperature. The device also provides a feeding capacitor connected to the VREF pin that allows additional stabilization of the VREF voltage. This capacitor should be connected to a source of quiet analog power.

The TPS2111APWG4 comes equipped with various features and protections to ensure the safety of the system and its components. Over temperature protection, over voltage protection, and under voltage protection are all included, as well as programmable peak current limiting and slope compensation. This device is designed to work with a wide range of MOSFETs and is ideal for applications that demand high efficiency and precise current control.

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