TPS62840DLCR: The 60nA IQ Buck Converter for Ultra-Low-Power Design

Quick Answers: What is the TPS62840DLCR and Why Does It Matter?

The TPS62840DLCR from Texas Instruments is a high-efficiency step-down (buck) converter designed for ultra-low-power and battery-powered applications. It operates from an input voltage range of 1.8 V to 6.5 V and delivers an output current of up to 750 mA. The device features an ultra-low operating quiescent current of typically 60 nA, and in 100% duty-cycle mode, the quiescent current drops to just 120 nA, significantly extending battery life in always-on systems. The output voltage is adjustable from 1.8 V upward, set by an external resistor divider. The TPS62840DLCR is available in an 8-pin VFDFN package (DLC), measuring 3.0 mm × 3.0 mm, suitable for space-constrained designs. As of 2026-08-25, the TPS62840DLCR is active in lifecycle status, with 99,999 units in stock at XAIPART, priced at $2.5455 per unit at quantity 1000+.

Technical Guide: How to Select, Design In, and Use the TPS62840DLCR

When designing with the TPS62840DLCR, ensure proper input and output capacitor selection (typically 10 µF and 22 µF, respectively) and place them close to the IC. The inductor value should be chosen based on the switching frequency and output current to maintain stable operation. The STOP pin can be used to disable switching for noise-sensitive measurements.

The TPS62840DLCR uses DCS-Control™ topology, which provides excellent transient response and stable operation with small output capacitors. It achieves 80% efficiency at a 1 µA load current (3.6 V input to 1.8 V output), making it ideal for energy-harvesting and IoT applications. The switching frequency is typically 1.8 MHz, allowing the use of small inductors and capacitors, reducing the overall solution footprint.

Key specifications include: input voltage range 1.8 V to 6.5 V, output voltage range 1.8 V to 5.5 V, maximum output current 750 mA, quiescent current 60 nA typical (120 nA in 100% mode), switching frequency 1.8 MHz typical, operating temperature range -40°C to +125°C (TJ). The device integrates a high-side and low-side MOSFET, a control loop, and a reference. The STOP pin allows the user to immediately disable switching to eliminate noise, which is beneficial in test and measurement systems. The device also includes soft-start, overcurrent protection, and thermal shutdown.

Alternatives & Comparison: Drop-In Replacements for TPS62840DLCR

When considering alternatives, the TPS62840DLCT is the same die in a different tape-and-reel packaging variant, making it a direct drop-in replacement. The TPS62821DLCR has a higher quiescent current and different control topology, while the TPS62822DLCR offers higher output current. Cross-brand options include the ADP5300, which is pin-compatible with similar ultra-low quiescent current, and the MAX17222, which has lower output current. Always verify pinout before substitution.

Summary: The TPS62840DLCT is the only true drop-in replacement with identical specifications. Other alternatives require careful evaluation of specs and pinout.

Industry Insight: Market Position, Lifecycle, and Supply

The TPS62840DLCR is in active lifecycle status, indicating it is in production and available for new designs. As of 2026-08-25, XAIPART holds 99,999 units in stock, with a base price of $2.5455 at quantity 1000+. This suggests a healthy supply situation. [DATA_NEEDED: Market share or competitive positioning data]

Trends & Outlook: What Buyers Should Watch

The demand for ultra-low quiescent current converters is growing with the proliferation of battery-powered IoT devices, wearables, and energy harvesting systems. The TPS62840DLCR's 60 nA IQ and 80% efficiency at 1 µA load position it well for these applications. Buyers should monitor supply chain trends and consider the TPS62840DLCT as a packaging alternative for flexibility. [VERIFY_NEEDED: Future product roadmap or market trends]