The TPS54239E is an adaptive on-time D-CAP2™ mode synchronous buck converter. The
TPS54239E enables system designers to complete the suite of various end-equipment power bus
regulators with a cost effective, low component count, low standby current solution. The main
control loop for the TPS54239E uses the D-CAP2™ mode control that provides a fast transient
response with no external compensation components. The adaptive on-time control supports seamless
transition between PWM mode at higher load conditions and Eco-mode™ operation at light loads.
Eco-mode™ allows the TPS54239 to maintain high efficiency during lighter load conditions. The
TPS54239E also has a proprietary circuit that enables the device to adopt to both low equivalent
series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic
capacitors. The device operates from 4.5-V to 23-V VIN input. The output voltage can be programmed
between 0.76 V and 7 V. The device also features an adjustable soft start time. The TPS54239E is
available in the 8-pin DDA package, and designed to operate from –40°C to 85°C.
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