Texas Instruments TLV75512PDYDR

Overview

TLV75512PDYDR from Texas Instruments is a 500mA, low-quiescent-current (25μA typical), fixed 1.2V output LDO regulator in thermally enhanced SOT-23-5 (DYD) package. It operates from 1.45V to 5.5V input, delivers ≤1% output accuracy at 85°C, and maintains regulation with only 1µF ceramic output capacitor - ideal for space-constrained, battery-powered MCU core supplies.

For engineers reviewing the TLV75512PDYDR datasheet, TLV75512PDYDR pinout, TLV75512PDYDR application, or TLV75512PDYDR equivalent, key selection criteria include its 238mV max dropout at 500mA (3.3VOUT), active output discharge, foldback current limit, and 60.3°C/W R_θJA thermal performance in the DYD package.

Technical Context

The TLV75512PDYDR uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (46dB at 100kHz). Its internal soft-start ensures monotonic V_OUT rise, while undervoltage lockout (1.21–1.44V threshold) prevents erratic behavior during brownout.

Functional modes include normal regulation, dropout (where V_OUT tracks V_IN), and disabled state with active pulldown (120Ω internal resistor). Thermal shutdown (165°C trip, 155°C reset) and foldback current limiting protect against sustained overloads and short circuits.

Key Specifications

Pinout & Package

SOT-23-5 package with exposed thermal pad (DYD variant); 2.9mm × 2.8mm footprint; thermal pad internally connected to GND and must be soldered to large-area ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV75512PDYDR, TLV75512PDBVR offers identical regulation performance but reduced thermal capability, while TPL7407LPGEDR serves a fundamentally different function - neither provides drop-in compatibility, but the DBVR variant remains the closest functional and parametric match for space-constrained 500mA LDO needs.

Availability

TLV75512PDYDR is available at Aetrix Electronics and suitable for portable medical devices, camera modules, white goods control boards, and grid infrastructure relays requiring stable component supply with guaranteed long-term sourcing.

Supply support for TLV75512PDYDR 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 and embedded processing technologies, with leadership in power management ICs and high-reliability industrial components.

The TLV755P family was designed specifically for ultra-small, low-I_Q LDO applications in battery-powered and space-constrained systems - emphasizing thermal efficiency, capacitor flexibility, and robust protection features.

FAQ

What is the maximum output current capability of the TLV75512PDYDR under continuous operation?

The TLV75512PDYDR delivers 500mA continuously when properly thermally managed - specifically with its exposed thermal pad soldered to a ≥100mm² copper pour on the PCB. At ambient temperatures up to 85°C and with adequate copper area, it sustains full rated current without thermal shutdown. Derating applies above 85°C ambient or with insufficient copper; the 238mV dropout spec at 500mA is validated for 3.3V_OUT, but the 1.2V version maintains equivalent current capability per datasheet Section 5.5.

Does the TLV75512PDYDR require an external pull-up resistor on the EN pin?

No, the TLV75512PDYDR does not require an external pull-up on EN. It features an internal pulldown resistor (120Ω) that ensures default shutdown when EN is left floating or driven low. To enable the device, drive EN to ≥1V (V_HI). If interfacing with open-drain logic or microcontroller GPIO, a pull-up may be used for signal integrity, but it is not functionally necessary for basic operation - the internal pulldown guarantees a defined state.

Can the TLV75512PDYDR operate with a 1.5V input voltage?

Yes, the TLV75512PDYDR can operate with a 1.5V input, but only in dropout mode since its nominal output is 1.2V and minimum input is specified as 1.45V. At 1.5V input, the dropout voltage margin is just 0.3V - well above the 238mV max at 500mA, so regulation is maintained. However, line transient performance degrades in dropout, and PSRR drops significantly below 100kHz. For best results, maintain ≥1.8V input to ensure headroom across temperature and load.

What is the purpose of the NC pin on the TLV75512PDYDR (Pin 4)?

Pin 4 on the TLV75512PDYDR is designated NC (No Connection) - it has no internal bond wire or silicon connection and must remain unconnected on the PCB. Neither routing nor copper fill should contact this pin. Its presence is mechanical (maintaining SOT-23-5 pin count and symmetry) and does not affect electrical or thermal performance. The thermal pad (underside) is internally tied to GND and must be soldered to a ground plane - this is distinct from Pin 4 and critical for thermal management.

How does the active output discharge feature work in the TLV75512PDYDR during shutdown?

When the EN pin is driven low, the TLV75512PDYDR activates an internal 120Ω pulldown switch between OUT and GND. This rapidly discharges the output capacitor (C_OUT), bringing V_OUT to near-zero volts within microseconds - time constant τ ≈ 120Ω × C_OUT. For example, with 10µF C_OUT, discharge completes in <1ms. This ensures a known, safe startup state and prevents back-powering of upstream circuitry or latch-up in downstream logic - a critical feature for systems requiring deterministic power sequencing.