STMicroelectronics ST619LBN

Overview

ST619LBN from STMicroelectronics is a regulated 5 V ±4 % charge pump DC-DC converter designed for low-noise, inductorless voltage boosting in battery-powered systems. It delivers up to 30 mA output current from a 2 V–3.6 V input (e.g., two alkaline or NiMH cells), features logic-controlled shutdown with ≤1 µA supply current, and operates in voltage-doubler or voltage-triple mode depending on input voltage to maintain regulation.

For engineers reviewing the ST619LBN datasheet, ST619LBN pinout, ST619LBN application, or ST619LBN equivalent, key selection criteria include guaranteed output current over temperature, shutdown-induced load disconnection, capacitor-only topology, efficiency across input range (80–82 %), and SO-8 package compatibility with space-constrained portable designs.

Technical Context

The ST619LBN uses a pulse-skipping controller to regulate output voltage by dynamically enabling charge pump cycles when VO drops below threshold. Its internal architecture switches between voltage-doubling (VI = 3.0–3.6 V), voltage-tripling (VI = 2.0–2.5 V), and alternating-mode (VI = 2.5–3.0 V) to sustain 5 V regulation across the full input range.

Shutdown is CMOS-compatible and active-high: asserting SHDN disconnects OUT from IN and reduces supply current to ≤1 µA. The device selects the higher of VI or VO to power its internal circuitry, improving efficiency at low input voltages. Oscillator frequency is nominally 500 kHz under full load.

Key Specifications

Pinout & Package

ST619LBN is housed in an SO-8 surface-mount package (ECOPACK® compliant, lead-free, JEDEC-standard dimensions). Pin layout supports compact, low-EMI charge pump implementation with dedicated flying capacitor terminals and logic-controlled shutdown.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar charge pump DC-DC converter applications.

Compared with MAX680ESA+ and TPS60403DBVR, ST619LBN uniquely balances tight 5 V regulation, ultra-low shutdown current, and minimal 0.22 µF capacitor requirements - making it optimal for space- and battery-limited dual-cell portable instruments where output stability and quiescent power dominate design priorities.

Availability

ST619LBN is available at Aetrix Electronics and suitable for handheld medical sensors, smart card readers, and wireless remote controls requiring stable component supply with consistent SO-8 packaging and long-term production support.

Supply support for ST619LBN 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative silicon solutions for automotive, industrial, and consumer markets since 1987.

The ST619LBN belongs to ST's legacy analog power management portfolio, specifically engineered for ultra-low-power, inductorless DC-DC conversion in portable battery-operated equipment where size, EMI, and battery longevity are critical.

FAQ

What input voltage range does the ST619LBN support, and how does it affect output current capability?

The ST619LBN operates from 2 V to 3.6 V. Output current is guaranteed at 20 mA for VI ≥ 2 V and increases to 30 mA for VI ≥ 3 V. This stepped current rating reflects internal mode switching: at lower VI, the device uses voltage-tripling to sustain 5 V, limiting peak charge transfer; above 3 V, voltage-doubling enables higher sustained current.

Can the ST619LBN be used with ceramic capacitors only, and what are the recommended values?

Yes - ST specifies 0.22 µF X7R ceramic capacitors for C1 and C2 (flying), and 10 µF ceramic or tantalum for C3 (input) and C4 (output). Ceramic capacitors are preferred for low ESR and stable capacitance over temperature; values outside 0.22–1.0 µF for flying caps may degrade output current or increase ripple.

How does the ST619LBN handle shutdown, and what happens to the output pin?

When SHDN is driven high (≥0.7×VI), the device enters shutdown mode: internal switches disconnect OUT from IN, causing VO to fall to 0 V. Supply current drops to ≤1 µA. SHDN is CMOS-compatible and must be tied to GND for normal operation; floating SHDN is not permitted per datasheet.

Is the ST619LBN RoHS-compliant and qualified for industrial temperature range?

Yes - the ST619LBN is ECOPACK®-certified (lead-free second-level interconnect) and rated for industrial operating junction temperature from –40 °C to +85 °C. Thermal resistance (R_thJA) is 160 °C/W for SO-8, confirming suitability for convection-cooled portable applications without heatsinking.