I2C Programmable 2.5A Buck-Boost ConverterAugust 20, 2019 by Paul Shepard
The TPS63810 from Texas Instruments is an I2C programmable buck-boost dc-dc converter intended primarily for applications supplied from a single-cell Li-ion battery. It uses a novel control scheme with three distinct operating modes: buck, boost and buck-boost. Compared with traditional average-current control schemes, the TPS63810 device has a more predictable behavior during buck-boost operation.
Targeted applications include smartphones and tablets, preregulators and USB VCONN supplies, TWS earbud chargers, general-purpose point-of-load regulators, and similar uses.
With a quiescent current of only 11µA, the TPS63810 device achieves efficiencies greater than 90% for output currents from 1mA to 2A. It also has a fast dynamic response, which enables it to maintain tight regulation of the output voltage even in the presence of load transients.
Two VOUT registers set the output voltage, and a VSEL pin selects which output voltage register is active. The device can support dynamic voltage scaling; for example, to support applications with low-power and high-power modes of operation. When the logic level on the VSEL pin changes, the TPS63810 device ramps linearly to the new output voltage setting.
The TPS63810 device requires only five external components and can be implemented with an active PCB area of only 39mm2.
Summary of Features
- Input voltage range: 2.2V to 5.5V
- Output voltage range:
- 1.825V to 5.2V
- Output current:
- Up to 2.5A for VI ≥ 2.5V, VO = 3.3V
- Up to 2.5A for VI ≥ 2.8V, VO = 3.5V
- Up to 2A for VI ≥ 2.5V, VO = 3.5V
- Typical efficiency >90% for IO = 1mA to 2A
- Typical supply current of 11µA
- Power-save mode (user-selectable)
- Real buck, boost and buck-boost operation with automatic mode transition
- I²C Interface (up to 1MHz)
- Robust operation:
- Input overvoltage
- Output overcurrent
- Thermal shutdown
- True shutdown function with load disconnect and active output discharge
- 15-ball, 0.4-mm pitch DSBGA package