Texas Instruments TLV70228PDBVT

Overview

TLV70228PDBVT from Texas Instruments is a 2.8 V fixed-output, 300-mA low-dropout (LDO) linear regulator in SOT-23-5 package, featuring 2% output accuracy, 35 μA quiescent current, and 37 mV dropout at 50 mA - designed for Li-ion–powered handheld devices requiring stable, low-noise, low-power supply regulation.

For engineers reviewing the TLV70228PDBVT datasheet, TLV70228PDBVT pinout, TLV70228PDBVT application, or TLV70228PDBVT equivalent, key selection considerations include its active pulldown capability (120 Ω), thermal shutdown (165°C), UVLO (1.9 V), PSRR (68 dB @ 1 kHz), and stability with ≥0.1 μF ceramic output capacitance.

Technical Context

The TLV70228PDBVT uses a PMOS pass transistor to achieve ultra-low dropout and high PSRR, with precision bandgap reference and error amplifier enabling ±2% DC accuracy across –40°C to +125°C. Its enable logic is active-high (EN > 0.9 V), and it integrates undervoltage lockout (UVLO) at 1.9 V to prevent erratic startup.

Unlike standard TLV702 variants, the "P" suffix denotes integrated active pulldown circuitry (120 Ω internal resistor) that discharges the output during shutdown - critical for systems requiring fast, controlled rail collapse. Thermal shutdown (165°C trip, 145°C reset) and current limit (320–860 mA) are fully integrated for fault protection without external components.

Key Specifications

Pinout & Package

TLV70228PDBVT is packaged in a 5-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size and exposed pad for thermal enhancement. Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NC (no connection; may be grounded for thermal improvement), Pin 5 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F2BHTSA1 and MCP1700T-2802E/TT, TLV70228PDBVT uniquely balances low IQ (35 μA), active pulldown (120 Ω), and industry-standard SOT-23-5 footprint - making it optimal for consumer portable electronics requiring precise power sequencing and compact layout.

Availability

TLV70228PDBVT is available at Aetrix Electronics and suitable for wireless handsets, Bluetooth audio modules, and ZigBee sensor nodes requiring stable component supply with consistent parametric performance and long-term manufacturability.

Supply support for TLV70228PDBVT 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 specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability, low-power, and signal-chain solutions.

The TLV702 series was developed for battery-powered portable electronics demanding ultra-low quiescent current, fast transient response, and robust protection - targeting smartphones, wearables, and IoT edge nodes.

FAQ

What is the minimum input voltage required for TLV70228PDBVT to regulate 2.8 V at 300 mA?

The TLV70228PDBVT requires VIN ≥ VOUT + VDO. At 300 mA, its dropout voltage is 220 mV (max), so minimum input is 2.8 V + 0.22 V = 3.02 V. For guaranteed regulation across temperature and process variation, TI specifies 2 V min input, but 3.02 V is required for full-load 2.8 V output. The device enters dropout below this threshold, reducing VOUT linearly with VIN.

Does TLV70228PDBVT require an input capacitor, and if so, what value is recommended?

An input capacitor is not required for stability but is strongly recommended for improved transient response and noise rejection. TI recommends a 0.1 μF to 1 μF low-ESR ceramic capacitor (X5R/X7R) placed close to the IN and GND pins. If source impedance exceeds 2 Ω or large fast transients are expected, a 1 μF capacitor is preferred to maintain regulation during load steps.

How does the active pulldown feature of TLV70228PDBVT function, and what is its design impact?

The TLV70228PDBVT's active pulldown engages when EN < 0.4 V, connecting OUT to GND via a 120 Ω internal resistor. This discharges output capacitance rapidly - e.g., a 10 μF cap falls from 2.8 V to 0.1 V in ~1.2 ms. It prevents floating outputs, avoids unintended logic states in downstream ICs, and satisfies strict power-rail sequencing requirements in portable systems.

Can TLV70228PDBVT operate with a 0.1 μF output capacitor, and what does "effective capacitance" mean in this context?

Yes - TLV70228PDBVT is stable with ≥0.1 μF effective output capacitance. "Effective capacitance" means the actual capacitance seen by the LDO under operating bias voltage and temperature, accounting for dielectric derating (e.g., X5R cap rated 1 μF may deliver only 0.15 μF at 2.8 V and 85°C). A 0.1 μF rated capacitor is insufficient unless its effective value remains ≥0.1 μF across all conditions.

What protection features are integrated into TLV70228PDBVT, and how do they behave under fault conditions?

TLV70228PDBVT integrates thermal shutdown (trip at 165°C, reset at 145°C), output current limit (320–860 mA), and undervoltage lockout (UVLO at 1.9 V). During overload, it enters constant-current mode until thermal shutdown activates; then it cycles on/off while cooling. UVLO holds output off until VIN rises above 1.9 V, preventing brownout operation and ensuring clean startup.