Texas Instruments TPS70628DRVT

Overview

TPS70628DRVT from Texas Instruments is a fixed-output 2.8-V, 150-mA ultralow-quiescent-current LDO voltage regulator in a 6-pin WSON package. It delivers 2% output accuracy over –40°C to +125°C, 1-µA quiescent current, and 245-mV dropout at 50 mA, enabling long battery life in always-on portable systems.

For engineers reviewing the TPS70628DRVT datasheet, TPS70628DRVT pinout, TPS70628DRVT application, or TPS70628DRVT equivalent, key selection criteria include shutdown current (150 nA), reverse current protection (10 nA), thermal shutdown threshold (158°C), and compatibility with 2.2-µF ceramic output capacitors.

Technical Context

The TPS70628DRVT uses a PMOS pass transistor architecture to achieve low dropout and inherent reverse current blocking. Its precision band-gap reference and error amplifier maintain 2% DC accuracy across temperature and load, while undervoltage lockout (UVLO) prevents erratic startup below 2.7 V input.

Functional modes include normal regulation (VIN ≥ VOUT + VDO), dropout operation (VIN < VOUT + VDO but > 2.7 V), and active-high enable-controlled shutdown (VEN < 0.4 V). Thermal shutdown activates at ~158°C and resets at ~140°C, with internal current limit set ≥200 mA.

Key Specifications

Pinout & Package

TPS70628DRVT is packaged in a thermally enhanced 2.0 mm × 2.0 mm WSON-6 (DRV) package with an exposed thermal pad electrically connected to GND. The pad must be soldered to a dedicated GND plane for optimal thermal performance (R_θJB = 42.6°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS70628DRVT, TPS70633DRVT offers identical performance at 3.3 V with zero layout impact, while MCP1700T-2802E/TT trades enable functionality, reverse protection, and low dropout for lower unit cost and smaller footprint - making it suitable only for simpler, non-battery-critical designs.

Availability

TPS70628DRVT is available at Aetrix Electronics and suitable for wearable health sensors, IoT edge nodes, medical diagnostic handhelds, and industrial camera modules requiring stable component supply and long-term lifecycle support.

Supply support for TPS70628DRVT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS706 series was designed specifically for ultralow-power, always-on battery applications demanding sub-µA quiescent current, reverse current blocking, and robust thermal protection - targeting wearables, medical sensors, and remote IoT endpoints.

FAQ

What is the maximum input voltage rating for the TPS70628DRVT?

The absolute maximum input voltage for the TPS70628DRVT is 7 V, but the recommended operating range is 2.7 V to 6.5 V. Exceeding 7 V risks permanent damage. For reliable 2.8-V output regulation, VIN must remain ≥3.045 V (2.8 V + 245 mV dropout) under 50-mA load, and ≥3.3 V under full 150-mA load per datasheet dropout curves. The TPS70628DRVT maintains regulation across this full input span while holding 1-µA quiescent current.

Does the TPS70628DRVT require an external pull-up resistor on the EN pin?

No, the TPS70628DRVT does not require an external pull-up resistor on the EN pin. The device enables automatically when EN is left floating due to internal weak pull-up. However, for deterministic behavior in noisy environments or when precise shutdown timing is required, TI recommends driving EN directly from a GPIO or using a 100-kΩ pull-up to VIN. The EN pin draws only 300 nA at 1.0 V, so leakage is negligible - and the TPS70628DRVT remains fully functional with EN tied to IN if shutdown capability is unnecessary.

Can the TPS70628DRVT safely operate with a 1-µF output capacitor?

No, the TPS70628DRVT requires a minimum output capacitance of 2.2 µF for guaranteed stability across all operating conditions. While some variants in the TPS706 family support 1.5 µF for outputs ≥1.5 V, the datasheet explicitly specifies 2.2 µF as the minimum for all versions including TPS70628DRVT. Using 1 µF risks oscillation, excessive overshoot during load transients, and failure to meet PSRR or noise specifications. A 2.2-µF X7R ceramic capacitor rated ≥6.3 V is the validated solution per TI's typical application circuit.

How does reverse current protection work in the TPS70628DRVT?

The TPS70628DRVT integrates active reverse current protection that blocks current flow from OUT to IN whenever V_OUT > V_IN, regardless of EN state. When triggered, the internal PMOS pass device enters high-impedance mode, limiting reverse leakage to 10 nA typical. This protection is always active - even during shutdown - and is critical for battery-backed systems where the output may retain voltage after input removal. The TPS70628DRVT allows safe reverse bias up to min(3×V_OUT, 6.5 V), i.e., 6.5 V for its 2.8-V output.

What thermal derating applies to the TPS70628DRVT in a 2-layer PCB design?

In a standard 2-layer PCB with 1-oz copper and no thermal vias, the TPS70628DRVT's junction temperature rise is governed by R_θJA = 73.1°C/W (WSON-6). At 150 mA and 3.3 V input (0.5 V dropout), power dissipation is 75 mW, resulting in ~5.5°C rise above ambient. To stay within the 125°C max junction limit at 70°C ambient, the design can sustain ≤750 mW - well above typical loads. However, TI recommends adding ≥4 thermal vias under the exposed pad and connecting to an inner GND plane to reduce R_θJB and avoid thermal cycling near the 158°C shutdown threshold.