Texas Instruments TPS63900DSKR

Overview

TPS63900DSKR from Texas Instruments is a synchronous buck-boost DC/DC converter optimized for ultra-low-power battery-powered systems, featuring 75-nA quiescent current, 1.8–5.5-V input range, 1.8–5.0-V programmable output (100-mV steps), and dual-voltage dynamic scaling via SEL pin - enabling power savings in standby/sleep modes of smart meters and medical sensor patches.

For engineers reviewing the TPS63900DSKR datasheet, TPS63900DSKR pinout, TPS63900DSKR application, or TPS63900DSKR equivalent, key selection criteria include its single-mode trapezoidal control architecture (eliminating buck/boost mode transitions), 400-mA output capability at VI ≥ 2.0 V / VO = 3.3 V, eight programmable input current limits (1–100 mA + unlimited), and WSON-10 (2.5 mm × 2.5 mm) package with thermal pad.

Technical Context

The TPS63900DSKR implements a four-switch synchronous buck-boost topology with trapezoidal inductor current control, enabling seamless regulation across VI < VO, VI = VO, and VI > VO without mode-switching transients. Its internal R2D interface reads CFG1–CFG3 resistor values at startup to configure VO(1), VO(2), and input current limit - after which pins are disabled to minimize leakage.

Dynamic voltage scaling operates via the SEL pin, triggering discrete 100-mV output steps with 125-µs duration per step and 30–40-µs response delay. Soft-start uses a two-phase ramp: 500-mA peak current limit for 500 µs until VO reaches 1.8 V, then 100-mV/125-µs steps to target voltage.

Key Specifications

Pinout & Package

TPS63900DSKR is housed in a 10-pin WSON (DSK) package with 2.5-mm × 2.5-mm body size and 0.5-mm pitch. The exposed thermal pad must be soldered to a GND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost converter applications.

Compared with TPS63802DSKR and MAX77650EWL+T, the TPS63900DSKR uniquely combines 75-nA IQ, hardware DVS, and eight-step input current limiting in a 2.5-mm × 2.5-mm WSON - making it the sole option for long-life primary-battery devices requiring adaptive voltage and precise current budgeting.

Availability

TPS63900DSKR is available at Aetrix Electronics and suitable for smart metering, medical sensor patches, and industrial IoT sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS63900DSKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC/DC conversion.

The TPS63900DSKR belongs to TI's ultra-low-power buck-boost converter product line, designed specifically for battery-constrained applications where multi-year operation, dynamic voltage adaptation, and robust battery interfacing are mandatory.

FAQ

What is the minimum input voltage required for TPS63900DSKR to start up and regulate?

The TPS63900DSKR requires a minimum input voltage of 1.75 V (typical positive-going UVLO threshold) to initiate startup and regulation. Below this, the device remains in undervoltage lockout. Once enabled, it sustains regulation down to 1.8 V input across the full operating temperature range, supporting discharge tails of primary lithium cells.

How does the TPS63900DSKR implement dynamic voltage scaling, and what is the timing behavior?

The TPS63900DSKR implements dynamic voltage scaling via the SEL pin: a logic transition triggers a controlled ramp between two resistor-programmed output voltages (VO(1) and VO(2)). Each step is 100 mV with 125 µs duration; total settling time depends on load current and output capacitance, per Equation 3 in the datasheet. Delay from SEL edge to first step is 30–40 µs.

Can the TPS63900DSKR be used with a prebiased output, and how does it behave during startup?

Yes, the TPS63900DSKR supports prebiased outputs. If the initial VOUT is below the target, switching begins only after the internal ramp exceeds the prebias voltage. If VOUT is above target, the device waits for load discharge to bring VOUT down to the target before starting - it cannot actively sink current to discharge the output capacitor.

What is the role of the thermal pad on the TPS63900DSKR WSON package, and how must it be connected?

The exposed thermal pad on the TPS63900DSKR DSK package serves as the primary thermal and electrical path to GND. It must be soldered to a dedicated GND copper pour using ≥4 thermal vias (0.3-mm diameter) to achieve the specified 31.1°C/W junction-to-board thermal resistance and ensure reliable operation at full load and elevated ambient temperatures.

Does the TPS63900DSKR support stacking multiple units for higher output current, and what is required?

Yes, the TPS63900DSKR supports stacking: paralleling multiple devices increases total output current capability. Synchronization is not required; phase interleaving occurs naturally due to slight propagation delays. Design requirements include matched input/output LC networks, shared EN/SEL signals, and individual CFG resistor networks per device to maintain identical VO and current-limit settings.