Texas Instruments TLV75515PDRVR

Overview

TLV75515PDRVR from Texas Instruments is a 500mA, low-quiescent-current (25μA typ), fixed 1.5V output low-dropout regulator in SOT-23-5 (DBV) package. It operates from 1.45V to 5.5V input, delivers ±1% output accuracy at 85°C, features built-in soft-start and active output discharge, and is stable with only 1µF ceramic output capacitance - ideal for powering MCU core rails in space-constrained portable electronics.

For engineers reviewing the TLV75515PDRVR datasheet, TLV75515PDRVR pinout, TLV75515PDRVR application, or TLV75515PDRVR equivalent, key selection criteria include dropout voltage at 500mA (238mV max @ 3.3VOUT, scaled per VOUT), thermal resistance (RθJA = 100.8°C/W for DBV), EN pin logic thresholds (VHI = 1V, VLO = 0.3V), and foldback current limit behavior under short-circuit conditions.

Technical Context

The TLV75515PDRVR uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (46dB @ 100kHz). Its internal bandgap reference and error amplifier deliver 1% output accuracy across –40°C to +85°C, while integrated UVLO (1.21–1.44V rising threshold) prevents erratic startup below minimum input voltage.

Functional modes include normal regulation (VIN > VOUT + VDO), dropout (VIN < VOUT + VDO, output tracks input), and disabled state (EN < VLO), where an internal 120Ω pulldown actively discharges the output. Thermal shutdown activates at 165°C with 10°C hysteresis, and foldback current limiting reduces dissipation during sustained overloads.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 2.8mm footprint with standard lead pitch; no thermal pad; suitable for reflow assembly on 2-layer PCBs with moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC75515DBVR and MCP1755-1502E/DB, TLV75515PDRVR provides superior combination of ultra-low IQ (25μA), active output discharge, and high-frequency PSRR - making it optimal for battery-sensitive, noise-critical, and fast-sequencing applications where reliability and precision are non-negotiable.

Availability

TLV75515PDRVR is available at Aetrix Electronics and suitable for portable electronics, IoT sensor nodes, white goods control panels, and industrial PLC I/O modules requiring stable component supply and long-term manufacturability.

Supply support for TLV75515PDRVR 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 designing analog and embedded processing chips for industrial, automotive, and personal electronics markets.

The TLV755P family was engineered specifically for ultra-small, low-power, high-accuracy LDO applications in battery-operated and space-constrained systems - emphasizing minimal solution size, low standby current, and robust fault protection.

FAQ

What is the maximum dropout voltage specification for TLV75515PDRVR at full 500mA load?

The TLV75515PDRVR has a maximum dropout voltage of 238mV at 500mA load when configured for 3.3V output. For the 1.5V version, datasheet data shows typical dropout ≤150mV at 500mA and 25°C; worst-case is bounded by the 1.5V ≤ VOUT < 1.8V row in Table 5.5, specifying 350–420mV max across temperature - confirming TLV75515PDRVR remains functional even with marginal input headroom like 1.8V input.

Does TLV75515PDRVR require an external pull-up resistor on the EN pin?

No, TLV75515PDRVR does not require an external pull-up on EN. It features an internal pulldown resistor (120Ω) that ensures the device remains disabled when EN is left floating or driven low. An external pull-up is only needed if precise timing-controlled enable sequencing is required - otherwise, connecting EN directly to IN provides simple always-on operation without additional components.

Can TLV75515PDRVR operate with less than 1µF output capacitance?

No - TLV75515PDRVR is specified and guaranteed stable only with ≥1µF ceramic output capacitance. The datasheet explicitly states "Make sure the nominal input and output capacitance is greater than 0.47µF" and recommends 1µF as the minimum for all operating conditions. Using smaller values risks instability, oscillation, or degraded transient response, especially under dynamic load changes.

What thermal resistance value applies to TLV75515PDRVR in its SOT-23-5 (DBV) package?

For TLV75515PDRVR in the DBV (SOT-23-5) package, the junction-to-ambient thermal resistance (RθJA) is 100.8°C/W under JEDEC-standard PCB conditions (2s2p, no vias), and 100.8°C/W is also listed for EVM testing. This value assumes standard 2-layer board layout with minimal copper; adding thermal vias and ground plane area can reduce effective RθJA by 20–40% in optimized designs.

How does the foldback current limit behave in TLV75515PDRVR during a short-circuit event?

In TLV75515PDRVR, foldback current limiting reduces output current as VOUT drops below 0.4×1.5V = 0.6V. At full short (VOUT ≈ 0V), the device delivers ~355mA (ISC), significantly lower than its 500mA rated current. This reduces power dissipation [(VIN – 0V) × 355mA], delaying thermal shutdown and enabling safer fault containment - unlike brick-wall limiters that sustain maximum current until immediate thermal shutdown.