Texas Instruments TPS61029QDPNRQ1

Overview

TPS61029QDPNRQ1 from Texas Instruments is an automotive-grade synchronous boost converter IC designed for battery-powered systems requiring regulated output voltage from ultra-low input (0.9 V) up to 5.5 V. It delivers up to 200 mA at 3.3 V output, features adjustable output voltage (1.8–5.5 V), 1800 mA switch current limit, and integrated low-battery comparator with LBI/LBO pins-used in portable medical devices and automotive infotainment power rails.

For engineers reviewing the TPS61029QDPNRQ1 datasheet, TPS61029QDPNRQ1 pinout, TPS61029QDPNRQ1 application, or TPS61029QDPNRQ1 equivalent, key selection considerations include its AEC-Q100 qualification, down-regulation capability below input voltage, Power Save Mode control via PS pin, and thermal performance in the 3-mm × 3-mm VSON-10 package.

Technical Context

The TPS61029QDPNRQ1 implements a fixed-frequency PWM controller with multiple feedforward paths-monitoring input voltage, output voltage, and NMOS switch voltage drop-to directly adjust duty cycle without relying solely on slow error-amplifier feedback. Its synchronous rectifier integrates N-channel and P-channel MOSFETs, achieving 96% peak efficiency while using separate GND and PGND pins to isolate control and power grounds.

It supports automatic down-regulation mode when input voltage exceeds output voltage (e.g., 4.2 V Li-ion → 3.3 V rail), dynamically controlling PMOS conduction to maintain regulation-though with increased power loss requiring thermal derating. The device also includes undervoltage lockout (0.8 V), overtemperature protection (140 °C), and soft-start with precharge current limiting during startup.

Key Specifications

Pinout & Package

TPS61029QDPNRQ1 is housed in a thermally enhanced 3.0 mm × 3.0 mm VSON-10 (DRC/DPN) package with exposed PowerPAD™ thermal pad soldered to PGND for efficient heat dissipation. Pin numbering follows top-view orientation with EN at Pin 1 and PowerPAD™ connected to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61025QDPNRQ1 and TPS61027QDPNRQ1, the TPS61029QDPNRQ1 provides design flexibility through adjustable output voltage and higher 1800 mA switch current-critical for maximizing output power from weak batteries-while retaining identical AEC-Q100 qualification, package, and functional pin compatibility.

Availability

TPS61029QDPNRQ1 is available at Aetrix Electronics and suitable for automotive infotainment displays, portable medical devices, and wireless tire pressure sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS61029QDPNRQ1 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 and embedded processing technologies, with decades of experience in automotive-grade power management ICs.

The TPS6102x-Q1 product line was engineered specifically for automotive battery-powered subsystems requiring high efficiency, ultra-low input start-up, and AEC-Q100 reliability-targeting infotainment, ADAS, and body electronics.

FAQ

What is the minimum input voltage required for TPS61029QDPNRQ1 to start switching?

The TPS61029QDPNRQ1 requires a minimum input voltage of 0.9 V to initiate start-up, with typical start-up occurring at 1.2 V due to undervoltage lockout hysteresis. Below 0.9 V, the device remains in shutdown and draws only 0.1 µA. This enables deep battery discharge utilization in single-cell alkaline or NiMH applications-extending operational life beyond conventional boost converters.

Can TPS61029QDPNRQ1 regulate output voltage when input voltage exceeds output voltage?

Yes, the TPS61029QDPNRQ1 supports down-regulation mode: when VBAT rises above the programmed VOUT (e.g., 4.2 V Li-ion → 3.3 V rail), it actively controls the PMOS rectifier to maintain regulation. However, this increases conduction loss and junction temperature-designers must verify thermal margin using RθJA = 47.9 °C/W and derate output current accordingly per the datasheet's thermal graphs.

How is the low-battery detection threshold set on TPS61029QDPNRQ1?

The low-battery threshold is set externally using a resistor divider from VBAT to GND, feeding the LBI pin. With an internal 500 mV comparator reference and 10 mV hysteresis, a typical configuration uses R1 = 390 kΩ and R2 = 500 kΩ to trigger LBO at 3.0 V. The LBO pin is open-drain and requires a 1 MΩ pull-up resistor to VOUT or system rail to generate a valid logic-low flag.

Does TPS61029QDPNRQ1 require external compensation components?

No, the TPS61029QDPNRQ1 uses internal compensation optimized for standard 6.8 µH inductors and 10 µF/2.2 µF ceramic capacitors. TI's reference design (SLVSA31A) validates stability with C1 = 10 µF X7R, C2 = 2.2 µF X7R, and C3 = 47 µF low-ESR tantalum-no additional compensation network is needed unless non-standard output capacitance or ESR values are used.

What is the purpose of separate GND and PGND pins on TPS61029QDPNRQ1?

GND serves as the reference for all analog control circuitry (error amplifier, comparators, reference), while PGND carries high pulsed currents from the SW node and inductor. Separating them prevents ground bounce from corrupting regulation accuracy. They must be connected at a single point near the IC's PowerPAD™-not at the system ground plane-to preserve noise isolation and ensure stable feedback loop operation.