Texas Instruments TLV75511PDQNR

Overview

TLV75511PDQNR from Texas Instruments is a 1.1V fixed-output, 500mA ultra-low-I_Q low-dropout regulator in a 1mm × 1mm X2SON-4 package. It operates from 1.45V to 5.5V input, delivers ±1.2% output accuracy over –40°C to +85°C, and features 25μA typical quiescent current, 238mV max dropout at 500mA (3.3V_OUT), and active output discharge - enabling reliable power sequencing in space-constrained portable MCU core rails.

For engineers reviewing the TLV75511PDQNR datasheet, TLV75511PDQNR pinout, TLV75511PDQNR application, or TLV75511PDQNR equivalent, key selection criteria include its 1.1V fixed output, X2SON-4 thermal performance (R_θJA = 168.4°C/W JEDEC), soft-start monotonicity, foldback current limit, and compatibility with ≥1µF ceramic output capacitors - all critical for battery-powered IoT sensor nodes and wearable SoC power domains.

Technical Context

The TLV75511PDQNR uses a PMOS pass transistor architecture with precision band-gap reference and error amplifier, delivering 1% typical output accuracy and high PSRR (46dB @ 100kHz). Its internal soft-start circuit controls inrush current during enable, ensuring monotonic V_OUT rise without overshoot or undershoot.

Functional safety features include undervoltage lockout (UVLO rising threshold 1.21–1.44V), thermal shutdown (165°C trip, 155°C reset), and foldback current limiting that reduces dissipation during short-circuit events - all integrated without external components.

Key Specifications

Pinout & Package

TLV75511PDQNR uses the X2SON-4 (DQN) package: 1mm × 1mm, 4-pin, no exposed thermal pad, bottom-side solderable terminals. Package footprint minimizes PCB area while maintaining adequate thermal dissipation for 500mA loads in ambient temperatures up to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGQDR and MCP1700T-1102E/TT, TLV75511PDQNR uniquely balances 500mA delivery, 25μA I_Q, active discharge, and 1mm² footprint - making it the only viable option for space- and power-constrained 1.1V MCU core rails requiring full feature integration.

Availability

TLV75511PDQNR is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, smart home edge nodes, and industrial wireless sensor transmitters requiring stable component supply across extended production lifecycles.

Supply support for TLV75511PDQNR 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 for industrial, automotive, and consumer markets.

The TLV755P series was designed specifically for ultra-compact, battery-sensitive applications demanding high accuracy, low quiescent current, and minimal external components - targeting next-generation IoT endpoints and portable electronics.

FAQ

What is the maximum output current capability of TLV75511PDQNR?

TLV75511PDQNR delivers up to 500mA continuous output current under recommended operating conditions (T_J ≤ 125°C, V_IN ≥ V_OUT + V_DO). At 500mA and 3.3V_OUT, dropout is guaranteed ≤238mV; for 1.1V_OUT, max dropout is 950mV at +85°C. Thermal derating applies above ambient temperatures where R_θJA = 168.4°C/W limits power dissipation.

Does TLV75511PDQNR require an external pull-up resistor on the EN pin?

No - TLV75511PDQNR has no internal pull-up on EN. The EN pin is active-high with V_HI = 1V (min) and V_LO = 0.3V (max). If EN is not actively driven, it must be externally pulled to IN or a valid logic-high voltage; floating EN may cause undefined operation. The device does include an internal 120Ω pulldown when disabled, but this does not replace a functional enable control signal.

Can TLV75511PDQNR operate with a 1µF output capacitor?

Yes - TLV75511PDQNR is explicitly stable with ≥1µF ceramic output capacitors (X5R/X7R dielectrics), as confirmed in the datasheet Section 5.5 and Figure 5-3. This eliminates need for larger electrolytic or tantalum capacitors, supporting miniaturized layouts. Derating for DC bias is required: ensure effective capacitance remains ≥0.47µF at rated voltage and temperature.

What is the purpose of the active output discharge feature in TLV75511PDQNR?

The active output discharge in TLV75511PDQNR uses an internal 120Ω switch from OUT to GND during shutdown, rapidly discharging the output capacitor. This ensures a defined low-voltage state before next power-up, preventing latch-up or false triggering in downstream logic. It is especially critical in systems with multiple power domains or shared reset lines where uncontrolled V_OUT decay could violate timing or voltage sequencing requirements.

How does the foldback current limit protect TLV75511PDQNR during short-circuit events?

TLV75511PDQNR implements hybrid foldback current limiting: it holds constant current until V_OUT drops below 0.4×V_OUT(NOM) (0.44V), then reduces current proportionally as V_OUT approaches GND. This lowers power dissipation [(V_IN – V_OUT) × I_OUT] during faults, delaying thermal shutdown and reducing stress on the PMOS pass element - improving reliability versus brick-wall limiters in sustained fault conditions.