Texas Instruments TLV70028DDCT

Overview

TLV70028DDCT from Texas Instruments is a 200-mA, low-quiescent-current, low-dropout linear regulator with fixed 2.8-V output, designed for power-sensitive portable applications. It delivers 2% output accuracy, 43-mV dropout at 50 mA, 31-μA quiescent current, and 68-dB PSRR at 1 kHz, serving as the primary voltage source for RF sections in battery-powered handheld devices.

For engineers reviewing the TLV70028DDCT datasheet, TLV70028DDCT pinout, TLV70028DDCT application, or TLV70028DDCT equivalent, key selection criteria include dropout performance under light-to-moderate load, thermal shutdown behavior at 160°C, stability with ≥0.1-μF ceramic output capacitance, and enable-pin logic thresholds (0.9 V high / 0.4 V low).

Technical Context

The TLV70028DDCT uses a PMOS pass transistor architecture enabling ultra-low dropout voltage that scales with load current-43 mV at 50 mA and 85 mV at 100 mA for VOUT = 2.8 V. Its precision bandgap reference and error amplifier maintain ±2% DC accuracy across –40°C to +125°C junction temperature.

Integrated protection includes thermal shutdown (trip at 160°C, reset at 140°C), current limiting (220–860 mA), and undervoltage lockout (UVLO activates below 1.9 V). The active-high EN pin supports system-level power sequencing, and the device remains regulated with zero output load.

Key Specifications

Pinout & Package

TLV70028DDCT is housed in a 5-pin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC70028DBVR and TPS7A0528PDBVR, TLV70028DDCT provides superior PSRR, guaranteed UVLO, and integrated thermal shutdown-making it the robust choice for unattended, battery-critical portable systems where reliability outweighs marginal IQ savings.

Availability

TLV70028DDCT is available at Aetrix Electronics and suitable for wireless handsets, Bluetooth® audio modules, and ZigBee® sensor networks requiring stable component supply, long-term manufacturability, and automotive-grade reliability validation.

Supply support for TLV70028DDCT 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 TLV700 series was developed specifically for portable battery-powered equipment-emphasizing ultra-low IQ, minimal dropout, and robustness in thermally constrained, space-limited handheld form factors.

FAQ

What is the minimum input voltage required for TLV70028DDCT to regulate at full 200-mA load?

The TLV70028DDCT requires VIN ≥ VOUT + VDO = 2.8 V + 85 mV = 2.885 V at 100 mA, and 2.8 V + 175 mV = 2.975 V at 200 mA for VOUT = 2.35 V-but for its rated 2.8-V output, dropout at 200 mA is not specified in the datasheet. Per Recommended Operating Conditions, VIN must be ≥2 V, but regulation at full load requires ≥2.975 V to ensure margin. TLV70028DDCT maintains regulation down to 2.885 V at 100 mA, making it viable for single-cell Li-ion systems above 3.0 V.

Can TLV70028DDCT operate without an output capacitor?

No. TLV70028DDCT requires a minimum effective output capacitance of 0.1 μF for stability, as confirmed in the Electrical Characteristics and Application sections. While it does not mandate a specific value like 1 μF, omitting COUT causes oscillation and loss of regulation. TI recommends 1-μF X5R/X7R ceramic capacitors, but any dielectric achieving ≥0.1 μF effective capacitance under bias and temperature is acceptable. TLV70028DDCT will not function reliably without COUT connected between OUT and GND.

Does TLV70028DDCT support reverse-voltage protection?

TLV70028DDCT does not include reverse-voltage protection. Its internal PMOS pass transistor has a body diode that conducts from OUT to IN when VOUT > VIN, with no current limit. If reverse voltage is possible-such as during hot-swap or backup-battery switchover-TI recommends adding an external Schottky diode in series with the IN pin or using a dedicated reverse-protection IC. This limitation applies identically across all TLV700xx variants, including TLV70028DDCT.

What is the thermal resistance (RθJA) of TLV70028DDCT in its SOT-23 package?

The TLV70028DDCT in the DDC (SOT-23-5) package has a junction-to-ambient thermal resistance (RθJA) of 235.9°C/W, as specified in the Thermal Information table. This value assumes standard JEDEC 2-layer board conditions. Actual thermal performance improves with increased copper area, thermal vias to inner layers, and grounding the NC pin. For continuous 200-mA operation at 2.8 V with 3.3-V input, power dissipation is ~100 mW, resulting in ~23.6°C junction-to-ambient rise-well within the –40°C to +125°C operating range.

Is TLV70028DDCT pin-compatible with other TLV700xx variants in the same package?

Yes. All TLV700xx devices in the DDC (SOT-23-5) package-including TLV70012DDCT, TLV70018DDCT, and TLV70028DDCT-share identical pinout, package dimensions, and thermal characteristics. Only the fixed output voltage differs. This allows drop-in replacement during design iteration or voltage-scaling optimization without PCB revision. However, EN logic thresholds, dropout, and PSRR remain consistent across the family, so TLV70028DDCT retains full functional compatibility with other DDC-packaged TLV700xx parts.