Texas Instruments TPS622311DRYR

Overview

TPS622311DRYR from Texas Instruments is a 2-MHz synchronous step-down DC-DC converter in a 1-mm × 1.5-mm USON-6 package, delivering up to 500 mA output current with fixed 1.1 V output voltage, 2.05–6 V input range, and 22 μA quiescent current in power-save mode. It serves as an ultra-compact, high-efficiency replacement for LDOs in space-constrained portable power rails.

For engineers reviewing the TPS622311DRYR datasheet, TPS622311DRYR pinout, TPS622311DRYR application, or TPS622311DRYR equivalent, key selection criteria include its 1.1 V fixed output, 2 MHz switching frequency, 6-pin USON thermal performance (R_θJA = 294.5°C/W), forced-PWM capability via MODE pin, and compatibility with 2.2 μH inductors and 4.7 μF output capacitors.

Technical Context

The TPS622311DRYR implements a hysteretic PWM controller architecture enabling stable 2 MHz operation with excellent AC load regulation and low output ripple-even at light loads-via optimized power-save mode that skips pulses while maintaining >90 dB PSRR. Its internal 0.7 V reference and fixed resistor divider set the 1.1 V output without external feedback components.

It integrates high-side (600–850 mΩ) and low-side (350–480 mΩ) MOSFETs, supports 100% duty cycle for ultra-low dropout, and features undervoltage lockout (1.8 V falling threshold), thermal shutdown at 150°C, and soft-start with ~100 μs ramp time. The MODE pin enables seamless transition between PFM (for efficiency) and forced PWM (for noise control).

Key Specifications

Pinout & Package

TPS622311DRYR is housed in a 6-pin 1.0 mm × 1.5 mm × 0.6 mm USON package (DRY suffix) with wettable flanks and an exposed thermal pad on the bottom for enhanced PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS622311DRYR, TPS62231DRYR provides higher output voltage (1.8 V vs. 1.1 V) for I/O domains, while TPS62235DRYR offers 1.2 V with identical 2 MHz operation - both retain the same 12 mm² solution size and thermal resistance, enabling drop-in layout reuse where voltage requirements align.

Availability

TPS622311DRYR is available at Aetrix Electronics and suitable for portable audio, low-power DSP core supply, and compact digital camera applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TPS622311DRYR 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 over 90 years of innovation in high-reliability, energy-efficient IC design.

The TPS6223x product line delivers ultra-small, high-frequency buck converters for battery-powered portable electronics - engineered to replace inefficient LDOs while meeting stringent size, efficiency, and noise requirements in wearables and IoT endpoints.

FAQ

What is the fixed output voltage of the TPS622311DRYR?

The TPS622311DRYR has a factory-trimmed fixed output voltage of 1.1 V, achieved via an internal resistor divider referenced to a 0.7 V bandgap. This eliminates external feedback components, reduces BOM count, and ensures ±2.5% accuracy across –40°C to 125°C junction temperature - making it ideal for powering low-voltage digital cores where precision and simplicity are critical. The TPS622311DRYR does not support adjustable output.

Does the TPS622311DRYR require external feedback resistors?

No, the TPS622311DRYR does not require external feedback resistors. Its 1.1 V output is set internally using a precision resistor divider network connected to the FB pin, which is permanently tied to the output. This integration reduces component count, PCB area, and potential errors from resistor tolerance or layout parasitics - a key advantage over adjustable buck controllers. The TPS622311DRYR relies solely on the FB pin's internal connection for regulation.

How does the MODE pin affect TPS622311DRYR operation?

The MODE pin on the TPS622311DRYR selects between two operating modes: when pulled low (to GND), the device automatically transitions between PWM (at medium/heavy loads) and power-save mode (PFM) at light loads to maximize efficiency; when pulled high (to VIN), it forces continuous PWM operation across the entire load range - suppressing audible noise and enabling predictable EMI filtering. This dual-mode flexibility makes the TPS622311DRYR suitable for both battery-life-critical and noise-sensitive applications.

What is the minimum input voltage required for TPS622311DRYR startup?

TPS622311DRYR requires a minimum input voltage of 2.05 V to initiate startup, enforced by its undervoltage lockout (UVLO) circuit. The falling UVLO threshold is 1.8 V (typical), meaning the device remains operational down to that level but will not restart until the input rises above the rising threshold of 1.9–2.05 V. This allows reliable operation from partially discharged Li-ion cells or two alkaline batteries, and the TPS622311DRYR supports 100% duty cycle to maintain regulation near dropout.

Can the TPS622311DRYR be used in thermally constrained designs?

Yes, the TPS622311DRYR is designed for thermally constrained environments: its USON-6 package features an exposed thermal pad, and its junction-to-ambient thermal resistance (R_θJA) is specified at 294.5°C/W under standard JEDEC test conditions. With proper PCB layout - including ≥2 cm² copper pour connected to the thermal pad - the TPS622311DRYR reliably delivers 500 mA at 1.1 V without exceeding 125°C junction temperature, even in sealed enclosures like smartwatches or medical patches.