company blog about TI TPS62745DSSR Dual-Cell Step Down Converter For Wireless Applications

TI TPS62745DSSR Dual-Cell Step Down Converter For Wireless Applications

Shenzhen Mingjiada Electronics Co., Ltd., as a professional electronic component supplier, stocks TI's TPS62745DSSR high-efficiency, ultra-low-power synchronous buck converter.

This chip is optimised for low-power wireless applications, featuring exceptionally low quiescent current and high conversion efficiency, making it ideal for battery-powered IoT devices.

【TPS62745DSSR Product Overview】

The TPS62745DSSR is a synchronous buck converter housed in a compact 12-pin 3mm×2mm WSON package. Its key advantage lies in its ultra-low 400nA quiescent current, enabling maximum power efficiency while delivering a regulated output.

Supporting an input voltage range of 3.3V to 10V, the TPS62745DSSR enables operation from two rechargeable lithium-ion cells (e.g., Li-SOCl₂, Li-SO₂, Li-MnO₂) or four to six alkaline batteries. It is equally suitable for USB port and thin-film solar module power scenarios. With an output current up to 300mA, efficiency reaches 90% when load current exceeds 15µA. The device offers 16 selectable output voltages ranging from 1.8V to 3.3V.

【TPS62745DSSR Technical Features】

The TPS62745DSSR employs RF-friendly DCS-Control™ technology, delivering low output ripple voltage and low noise characteristics. When paired with small output capacitors, it meets the requirements of wireless communication applications sensitive to power supply noise.

The TPS62745DSSR integrates an input voltage switch, controllable via the EN_VIN_SW pin, which connects the power supply voltage to the VIN_SW pin. This switch is dedicated to an external voltage divider, proportionally reducing the input voltage to an external ADC and automatically disconnecting when the supply voltage falls below the under-voltage lockout threshold.

Additional features include: integrated VOUT discharge capability, open-drain output for normal operation, compatibility with miniature 3.3μH or 4.7μH inductors, and an operating temperature range of -40°C to +125°C, making it suitable for industrial environments.

This buck converter incorporates multiple advanced technologies, specifically optimised for low-power scenarios.

Its most notable feature is an ultra-low quiescent current of just 400nA. This means minimal power consumption when the device is in standby or low-activity states, significantly extending battery life.

The TPS62745DSSR employs the DCS-Control™ topology, an RF-friendly control mechanism that substantially reduces output ripple voltage and noise. This characteristic is crucial for noise-sensitive wireless communication applications.

The device further incorporates a suite of practical features:

Integrated input voltage switching: Controlled via the EN_VIN_SW pin, this enables an external voltage divider to provide a proportionally reduced input voltage for external ADCs.

Integrated VOUT discharge function: Ensures rapid and safe device shutdown.

Open-drain power-good output: Enables system status monitoring.

【Practical Advantages of the TPS62745DSSR】

The TPS62745DSSR demonstrates significant advantages in practical applications. Its efficiency of up to 90% is achievable even at a load current of just 15µA, meaning it maintains high efficiency under light loads where many conventional converters experience a sharp drop in efficiency.

For space-constrained wireless devices, the TPS62745DSSR's compact package (3mm × 2mm WSON-12) significantly reduces PCB footprint.

Furthermore, it requires only a small 3.3µH or 4.7µH inductor, further reducing the overall solution footprint.

The device's wide input voltage range (3.3V to 10V) offers designers multiple power supply options:

Two-cell lithium-ion batteries (Li-SOCl₂, Li-SO₂, Li-MnO₂)

Four to six alkaline batteries

USB ports

Thin-film solar modules

This flexibility enables the TPS62745DSSR to adapt to diverse application scenarios and power requirements.

【TPS62745DSSR Application Domains】

This buck converter is ideally suited for the following low-power wireless applications: Bluetooth Low Energy, RF for Consumer Electronics (RF4CE), short-range low-power communication technologies (Zigbee), and other wireless connectivity solutions.

In industrial metering applications, its low-power characteristics significantly extend the operational lifespan of battery-powered metering devices.

Energy harvesting applications also benefit, particularly when paired with thin-film solar modules, where its wide input voltage range and high conversion efficiency enhance energy utilisation.

Within smart home and building automation, devices supporting Zigbee and Bluetooth Low Energy – such as sensors, smart door locks and lighting control systems – benefit from its efficient power management.