Texas Instruments TPS77101DGKR

Overview

TPS77101DGKR from Texas Instruments is an adjustable 150-mA low-dropout (LDO) voltage regulator with integrated open-drain power-on reset output, housed in an 8-pin MSOP (DGK) package. It delivers stable output from 1.5 V to 5.5 V, features 115 mV typical dropout at 150 mA (for 3.3-V variant), 92 µA quiescent current, and 55 µV_rms output noise without external bypass capacitor - ideal for battery-powered DSP/microprocessor supply rails requiring precise voltage supervision.

For engineers reviewing the TPS77101DGKR datasheet, TPS77101DGKR pinout, TPS77101DGKR application, or TPS77101DGKR equivalent, key selection criteria include its adjustable output range (1.5–5.5 V), 220-ms reset delay with 95% V_OUT threshold, PMOS pass element enabling load-independent quiescent current, and compatibility with low-ESR ceramic (≥10 µF) or tantalum (≥1 µF) output capacitors.

Technical Context

The TPS77101DGKR implements a PMOS-based LDO architecture that yields ultralow, load-independent quiescent current (92 µA typ. from 0–150 mA) and dropout voltage directly proportional to output current (e.g., 115 mV at 150 mA for 3.3-V option). Its internal 1.1834-V reference feeds a high-gain error amplifier controlling the pass device.

It integrates a dedicated reset comparator monitoring V_OUT, asserting active-low RESET after a fixed 220-ms delay once V_OUT reaches ≥95% of target, with hysteresis of ~0.5% V_OUT. The EN pin enables TTL-compatible shutdown (<1 µA standby), and FB/SENSE supports external resistor-divider programming for adjustable output.

Key Specifications

Pinout & Package

TPS77101DGKR is packaged in an 8-pin MSOP (DGK) - 3.0 mm × 3.0 mm, 0.65 mm pitch, exposed thermal pad - optimized for space-constrained PCB layouts and thermal performance in handheld devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77101DGKR, TPS76301DBVR offers smaller footprint but sacrifices reset integration and output flexibility, while MCP1826T-ADJE/DC provides higher current headroom but no built-in reset - making TPS77101DGKR uniquely suited for compact, supervised adjustable-rail designs.

Availability

TPS77101DGKR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wearable fitness trackers, and automotive body control units requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TPS77101DGKR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power solutions.

The TPS771xx family was designed specifically for battery-powered and space-constrained systems needing integrated voltage regulation and power-supply supervision - targeting portable instrumentation, industrial automation, and automotive sub-systems.

FAQ

What output voltage range does the TPS77101DGKR support?

The TPS77101DGKR supports an adjustable output voltage range from 1.5 V to 5.5 V, set via an external resistor divider connected to the FB/SENSE pin. This flexibility allows a single part number to serve multiple rail requirements across product variants, reducing design complexity and inventory SKUs. The device maintains ±2% output accuracy over line, load, and temperature conditions within this range.

How does the RESET function operate on the TPS77101DGKR?

The TPS77101DGKR's RESET pin is an open-drain, active-low output that asserts after a fixed 220-ms delay once the regulated output reaches ≥95% of its target voltage. It deasserts immediately if V_OUT falls below that threshold. The output requires an external pullup resistor and is electrically compatible with standard microcontroller reset inputs. This behavior is confirmed in the SLVS225D datasheet timing diagrams and functional block diagram.

What is the minimum output capacitor required for stability with the TPS77101DGKR?

The TPS77101DGKR requires a minimum 1 µF low-ESR tantalum capacitor or ≥10 µF low-ESR ceramic capacitor at the output for loop stability. The datasheet specifies ESR limits graphically (Figures 18–21) depending on capacitance value and temperature. Using undersized or high-ESR capacitors risks oscillation or degraded transient response - verified through stability testing in TI's application notes.

Does the TPS77101DGKR support shutdown mode, and what is its quiescent current in that state?

Yes, the TPS77101DGKR supports shutdown via the EN pin: applying a logic-high signal disables the regulator and reduces quiescent current to ≤1 µA at T_J = 25°C (≤3 µA over full temperature range). This ultra-low standby current is achieved via PMOS gate control and is measured per the electrical characteristics table in SLVS225D, making it ideal for intermittent-operation systems.

Can the TPS77101DGKR be used with ceramic output capacitors, and are there dielectric restrictions?

Yes, the TPS77101DGKR is stable with X5R and X7R ceramic capacitors (≥10 µF), which offer low ESR and good temperature stability. Y5U and Z5U types are explicitly discouraged due to excessive capacitance drift over temperature and voltage - a restriction documented in the "External Capacitor Requirements" section of SLVS225D to ensure robust loop stability across operating conditions.