Texas Instruments TPS61299QDRLRQ1

Overview

TPS61299QDRLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous boost converter optimized for ultra-low-power automotive systems. It delivers 1.8V–5.5V regulated output from 0.5V–5.5V input, features 95nA typical quiescent current from VOUT, 1.2A average input current limit, and supports fast transient mode (8μs settling at 0→200mA) for ADAS sensor rails and infotainment backup supplies.

For engineers reviewing the TPS61299QDRLRQ1 datasheet, TPS61299QDRLRQ1 pinout, TPS61299QDRLRQ1 application, or TPS61299QDRLRQ1 equivalent, key selection criteria include its 95nA IQ enabling >10-year coin-cell operation, true input-output disconnection during shutdown (<60nA VIN leakage), SOT563 package footprint compatibility with space-constrained automotive modules, and dual-mode operation (fast transient vs. high-accuracy load regulation) selectable via VSEL resistor.

Technical Context

The TPS61299QDRLRQ1 employs a hysteretic current-mode control architecture with constant 350mA inductor ripple current, resulting in variable switching frequency (~3MHz at 3.6V→5V/1μH). It implements three operational modes-boost, down, and pass-through-with automatic transitions: enters down mode when VIN > VOUT −35mV, switches to pass-through at VIN > VOUT +100mV, and resumes boost when VOUT drops below target −75mV.

Its functional safety capability includes documentation support for ISO 26262 ASIL-B system integration. The VSEL pin enables 21 factory-trimmed output voltages (1.8V–5.5V) via external resistor; configuration is latched at startup and requires EN toggle to refresh. Input UVLO is asymmetric (0.7V rising, 0.5V falling), allowing operation down to 150mV VIN if VOUT > 0.7V is maintained externally.

Key Specifications

Pinout & Package

SOT563 package (1.6mm × 1.6mm, 0.55mm height), 6-pin surface-mount with exposed thermal pad (DRL variant). Pin 1 (VIN) and Pin 6 (GND) are adjacent corners; Pin 5 (VOUT) is center-right for optimal power loop layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with TPS61099YFFR, the TPS61299QDRLRQ1 adds critical 1.2A input current limiting and VSEL-based voltage flexibility for automotive systems, while its 95nA IQ outperforms MAX20419's 2.5μA by 26×-making it uniquely suited for decade-long battery operation in safety-critical ADAS nodes.

Availability

TPS61299QDRLRQ1 is available at Aetrix Electronics and suitable for automotive infotainment backup supplies, ADAS camera sensor rails, and telematics GPS module power requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS61299QDRLRQ1 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 headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and consumer markets.

The TPS61299-Q1 product line targets ultra-low-power automotive subsystems requiring AEC-Q100 qualification, functional safety documentation, and decade-long battery operation-specifically addressing infotainment memory retention, ADAS sensor wake-up, and lighting control reliability.

FAQ

What is the minimum input voltage required for TPS61299QDRLRQ1 to start switching?

The TPS61299QDRLRQ1 requires a minimum 0.7V input voltage (rising threshold) to initiate startup and begin switching. Once operational and VOUT exceeds 1.8V, it sustains regulation down to 0.5V input. With external circuitry holding VOUT above 0.7V, it can operate from as low as 150mV VIN-enabling use with deeply discharged alkaline cells. This behavior is confirmed in Section 5.3 Recommended Operating Conditions and Figure 6-4 mode transition diagram.

How does the VSEL pin configure output voltage on the TPS61299QDRLRQ1?

The VSEL pin on the TPS61299QDRLRQ1 selects one of 21 factory-trimmed output voltages (1.8V–5.5V) by connecting an external resistor to GND. Configuration occurs once at startup when VOUT reaches ~1.8V; the device latches the setting and ignores subsequent VSEL changes until EN is toggled. Resistor accuracy must be ≤1% and parasitic capacitance <10pF per Table 6-1 and Section 6.3.2. The TPS61299QDRLRQ1 does not support runtime reconfiguration.

Does the TPS61299QDRLRQ1 support true input-output disconnection during shutdown?

Yes, the TPS61299QDRLRQ1 provides true disconnection: when EN is pulled low, the high-side PMOS fully turns off, breaking the conduction path between VIN and VOUT. This results in <60nA shutdown current from VIN and eliminates reverse current flow-critical for automotive battery preservation. This behavior is explicitly stated in Features and Section 6.3.6, and verified by the 60nA ISD specification in Table 5.5.

What is the difference between fast transient mode and normal mode on the TPS61299QDRLRQ1?

Fast transient mode on the TPS61299QDRLRQ1 prioritizes speed: it achieves 8μs settling time for 0→200mA load steps but sacrifices load regulation (±37.5mV). Normal mode optimizes accuracy with ±15mV regulation but slower response. Mode selection is determined by the VSEL resistor value per Table 6-1 (e.g., 4.75kΩ selects 5.5V fast mode). Both modes are mutually exclusive and fixed at startup.

Can the TPS61299QDRLRQ1 operate with input voltage higher than output voltage?

Yes, the TPS61299QDRLRQ1 automatically enters down mode when VIN exceeds VOUT −35mV and transitions to pass-through mode at VIN > VOUT +100mV. In pass-through, the high-side PMOS is fully enhanced, delivering VOUT ≈ VIN − (IL × DCR_L + IL × R_DS(on)). Input current limiting and thermal shutdown are disabled in this mode per Section 6.3.9, making it ideal for high-efficiency battery-powered systems during nominal operation.