Texas Instruments TPS62125DSGT

Overview

TPS62125 from Texas Instruments is a synchronous step-down DC-DC converter optimized for ultralow-power applications, delivering up to 300 mA output current with 3 V to 17 V input range, 1.2 V to 10 V adjustable output voltage, and DCS-Control™ topology enabling seamless PFM/PWM transition. It serves as a primary power rail in battery-powered embedded systems requiring precise enable supervision and power-good signaling.

For engineers reviewing the TPS62125 datasheet, TPS62125 pinout, TPS62125 application, or TPS62125 equivalent, key selection considerations include its adjustable enable threshold (1.2 V typical rising edge), 13 µA quiescent current, 350 nA shutdown current, open-drain PG output with 95% regulation threshold, and WSON-8 package compatibility with TPS62160/70.

Technical Context

The TPS62125 implements TI's DCS-Control™ architecture, combining fast AC loop sensing via the VOS pin with a stable DC feedback loop through the FB pin and internal 0.808 V reference. This dual-loop structure enables <1% output voltage ripple in PFM mode and sub-2 µs PG response delay.

Its functional blocks include an integrated 6 µA enable comparator with user-adjustable hysteresis (via EN_hys pin), undervoltage lockout (2.9 V rising / 2.8 V falling), thermal shutdown at 150°C, and 100% duty-cycle low-dropout operation-enabling regulation down to VIN ≈ VOUT + IOUT × RDS(ON)max.

Key Specifications

Pinout & Package

TPS62125 uses an 8-pin WSON (DSG) package with 2.0 mm × 2.0 mm body size and exposed thermal pad soldered to GND for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS62160DSGR and TPS62840DLCR, the TPS62125 uniquely combines adjustable enable hysteresis, open-drain PG, and 1.2–10 V output programmability in a thermally robust 2 mm × 2 mm WSON package-making it the only option for battery-supervised systems requiring both precision sequencing and flexible rail generation.

Availability

TPS62125 is available at Aetrix Electronics and suitable for embedded processing, energy-harvesting sensor networks, and portable medical devices requiring stable component supply across long product lifecycles.

Supply support for TPS62125 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 ICs, with decades of expertise in high-efficiency DC-DC conversion.

The TPS62125 belongs to TI's DCS-Control™ synchronous buck converter family, designed specifically for ultralow-power battery and energy-harvesting applications demanding high light-load efficiency, precise enable supervision, and minimal board area.

FAQ

What is the minimum input voltage required for TPS62125 to regulate a 3.3 V output at 300 mA?

The minimum input voltage depends on load current and MOSFET RDS(ON). At 300 mA and 12 V input, high-side RDS(ON) is 1.5 Ω typical. Using V_IN(min) = V_OUT + I_OUT × R_DS(ON), the theoretical dropout is 3.3 V + 0.3 A × 1.5 Ω = 3.75 V. The TPS62125 achieves 100% duty cycle to maintain regulation down to this level, confirmed in datasheet Figure 12.

Can TPS62125 be used in an inverting buck-boost configuration to generate a negative output voltage?

Yes-the TPS62125 supports inverting operation per TI Application Report SLVA438. With FB grounded and VOS connected to the negative output rail, it regulates –5 V from a 12 V input. The SW pin's –3.0 V AC rating (per Absolute Maximum Ratings) ensures safe operation, and PG can monitor |VOUT| regulation status.

How does the EN_hys pin function, and what resistor value is needed to double the built-in hysteresis?

The EN_hys pin is an open-drain output that pulls low when EN voltage falls below 1.15 V. Connecting a resistor from EN_hys to VIN increases hysteresis by injecting current into the EN comparator. To double hysteresis from 50 mV to 100 mV, a 576 kΩ resistor (as shown in Typical Application Schematic) is used-verified in datasheet Section 7.3.2 and Figure 5.

Does TPS62125 support start-up into a pre-biased output capacitor?

Yes-the TPS62125 features controlled start-up into pre-biased outputs. As described in Section 7.4.4, it begins switching only after the output voltage decays to the target level via external load or leakage, preventing reverse current flow and ensuring monotonic ramp-up without overshoot or instability.

What is the maximum output current capability of TPS62125 across its full input voltage range?

The TPS62125 delivers 300 mA continuously when VIN ≥ 6 V, but derates to 200 mA when VIN is 3–6 V (per Recommended Operating Conditions Table 6.3). This limitation arises from reduced high-side MOSFET drive strength and increased conduction losses at low VIN, not thermal constraints.