Texas Instruments TPS61071DDCR

Overview

TPS61071DDCR from Texas Instruments is a synchronous boost DC-DC converter IC designed for low-input-voltage battery-powered systems. It delivers up to 75 mA at 3.3 V from a 0.9-V input, operates with 90% peak efficiency, features fixed 1.2-MHz switching frequency, and provides load disconnect during shutdown. It is used in portable medical devices and single-cell alkaline/NiMH-powered instrumentation.

For engineers reviewing the TPS61071DDCR datasheet, TPS61071DDCR pinout, TPS61071DDCR application, or TPS61071DDCR equivalent, key selection criteria include its fixed-frequency PWM operation (no power-save mode), 0.9–5.5-V input range, 500-mV feedback reference, 600-mA switch current limit, and SOT-23-6 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS61071DDCR implements a fixed-frequency, pulse-width-modulation controller with synchronous rectification using integrated N-channel and P-channel MOSFETs. Its control loop uses an error amplifier comparing FB voltage to a precise 500-mV internal reference, while feedforward paths monitor VBAT, VOUT, and NMOS switch voltage drop to dynamically adjust duty cycle without relying solely on slow loop response.

Unlike TPS61070/TPS61073, the TPS61071DDCR disables power-save mode-ensuring constant 1.2-MHz operation across all load conditions. It integrates undervoltage lockout (0.8-V threshold), overtemperature protection (140°C trip), soft-start with precharge current limiting, and backgate-controlled load isolation that fully disconnects VOUT from VBAT during EN=low shutdown.

Key Specifications

Pinout & Package

TPS61071DDCR is housed in a 6-pin thin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm with standard lead pitch and thermal pad-compatible footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61071DDCR, TPS61070DDCR improves light-load efficiency via power-save mode but adds complexity in transient response; TPS61072DDCR trades higher inductor size for lower switching loss at mid-to-high input voltages-neither offers pin-to-pin replacement without layout or compensation review.

Availability

TPS61071DDCR is available at Aetrix Electronics and suitable for portable audio players, personal medical devices, feature phones, and white LED lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS61071DDCR 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, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.

The TPS6107x family was designed specifically for ultra-low-input-voltage battery-powered applications-enabling direct regulation from single-cell alkaline, NiMH, or Li-ion sources without intermediate LDO stages.

FAQ

What is the minimum input voltage required for TPS61071DDCR to start up?

The TPS61071DDCR requires a minimum input voltage of 1.2 V to initiate startup under typical conditions (RL = 270 Ω). Below this threshold, the undervoltage lockout circuit prevents operation to avoid unstable regulation. Once running, it sustains regulation down to 0.9 V input, making it suitable for deeply discharged alkaline cells. This behavior is confirmed in Section 8.5 of the SLVS510E datasheet.

Does TPS61071DDCR support adjustable output voltage, and how is it configured?

Yes, TPS61071DDCR supports adjustable output voltage from 1.8 V to 5.5 V using an external resistor divider connected to the FB pin. The internal reference is 500 mV, so R1 and R2 values are selected per VO = 0.5 V × (1 + R1/R2). For example, 3.3 V output uses R2 = 200 kΩ and R1 = 1.1 MΩ. This configuration is validated in the Typical Application Circuit (Figure 12) and Section 11.2.2.1 of the datasheet.

How does TPS61071DDCR handle shutdown and load isolation?

When EN is pulled low, TPS61071DDCR enters shutdown mode: switching ceases, internal circuitry powers down, and a dedicated backgate control circuit disconnects the source of the high-side PMOS from its cathode-blocking conduction through the body diode. This achieves true load isolation, reducing shutdown current to ≤0.5 µA and preventing battery drain. This mechanism is detailed in Section 10.3.1.1 of the SLVS510E datasheet.

What is the switching frequency of TPS61071DDCR, and is it user-adjustable?

The TPS61071DDCR operates at a fixed switching frequency of 1.2 MHz (typical), with tolerance of ±20% across temperature and input voltage. This frequency is internally set and not user-adjustable-distinguishing it from power-save variants like TPS61070DDCR. The fixed frequency simplifies EMI filter design and ensures consistent transient response, as specified in Section 8.5 (Oscillator frequency) of the datasheet.

Can TPS61071DDCR drive a 100-mA load at 5 V from a 3.3-V input?

No-TPS61071DDCR is rated for maximum output current of 75 mA at 3.3 V from 0.9-V input, and its 600-mA switch current limit restricts practical 5-V output to ~60 mA from 3.3-V input (per Figure 1: Maximum Output Current vs Input Voltage). Attempting 100 mA risks thermal shutdown or regulation loss. For higher currents, consider TPS61088 or similar higher-capacity boost converters.