Texas Instruments LM3352MTC-3.0/NOPB

Overview

LM3352MTC-3.0/NOPB from Texas Instruments (formerly National Semiconductor) is a regulated switched-capacitor buck-boost DC/DC converter delivering 3.0 V ±3% output with up to 200 mA load current from 2.5 V–5.5 V input. It uses proprietary dual-loop digital control to auto-select optimal gain configuration and operates at 1 MHz typical switching frequency. Designed for portable battery-powered systems requiring compact, low-noise 3.0 V regulation.

For engineers reviewing the LM3352MTC-3.0/NOPB datasheet, LM3352MTC-3.0/NOPB pinout, LM3352MTC-3.0/NOPB application, or LM3352MTC-3.0/NOPB equivalent, key selection criteria include its ±3% output accuracy, 400 µA typical operating current, 2.5 µA shutdown current, TSSOP-16 package footprint, and buck-boost capability across single-cell Li-ion, NiMH, and alkaline input ranges.

Technical Context

The LM3352MTC-3.0/NOPB implements a dual-loop regulation architecture: an analog comparator loop gates charge transfer to maintain output voltage, while a digital control block selects among seven discrete gain configurations based on real-time VIN and load conditions. This enables automatic buck or boost operation without external inductors.

Its switched-capacitor topology eliminates magnetic components and relies on three 0.33 µF ceramic flying capacitors (C1–C3), one 1 µF X7R CFIL filter capacitor, and external input/output bulk capacitors. Thermal protection disables switching when junction temperature exceeds 150 °C, re-enabling upon cooldown.

Key Specifications

Pinout & Package

LM3352MTC-3.0/NOPB is housed in a 16-pin TSSOP package (NS Package Number MTC16), 5.0 mm × 4.4 mm × 1.1 mm max height, with exposed pad not connected internally. All GND pins must be tied to a common ground plane for thermal and noise performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost switched-capacitor DC/DC converter applications.

Compared with TPS60230RGTR and MAX8815AETE+T, the LM3352MTC-3.0/NOPB offers superior thermal protection, explicit CFIL filtering for internal rail stability, and guaranteed 200 mA operation across its full input range - making it preferred for robust, production-grade portable designs where reliability under variable load and temperature is essential.

Availability

LM3352MTC-3.0/NOPB is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor nodes, smart wearables, and point-of-sale terminals requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for LM3352MTC-3.0/NOPB 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 acquired National Semiconductor in 2011 and maintains full technical and supply chain support for legacy power management products including the LM3352 series.

The LM3352 belongs to National Semiconductor's switched-capacitor DC/DC converter family, engineered specifically for battery-powered portable electronics needing compact, inductorless, and highly efficient voltage regulation.

FAQ

What is the guaranteed output voltage tolerance for LM3352MTC-3.0/NOPB across temperature and load?

The LM3352MTC-3.0/NOPB guarantees ±3% output voltage accuracy over the full operating temperature range (−40 °C to +85 °C) and load range (1 mA to 100 mA). At higher loads (up to 200 mA), the specification remains ±3.0% for VIN between 3.8 V and 5.5 V, as confirmed in the Electrical Characteristics table for the LM3352-3.0 version. This tolerance ensures compatibility with 3.0 V logic families and precision analog circuitry without external feedback adjustment.

Can LM3352MTC-3.0/NOPB operate from a single 3.7 V Li-ion cell throughout its discharge curve?

Yes - the LM3352MTC-3.0/NOPB accepts input voltages from 2.5 V to 5.5 V, fully covering the usable discharge range of a single Li-ion cell (≈3.0 V to 4.2 V). Its buck-boost architecture automatically switches between step-down and step-up modes to maintain 3.0 V output even as the cell voltage falls below 3.0 V, eliminating the need for separate buck and boost stages in portable designs.

What are the mandatory external capacitors for LM3352MTC-3.0/NOPB and their dielectric requirements?

The LM3352MTC-3.0/NOPB requires three 0.33 µF flying capacitors (C1, C2, C3), one 1 µF X7R ceramic filter capacitor on CFIL, plus external input (CIN ≥15 µF) and output (COUT ≥33 µF) bulk capacitors. X7R dielectric is explicitly recommended for C1–C3 to ensure stable capacitance across temperature; CIN and COUT may use tantalum, polymer electrolytic, or ceramic depending on ripple and size trade-offs - as detailed in the Applications Information section.

Does LM3352MTC-3.0/NOPB support true shutdown with near-zero current draw?

Yes - when the SD pin is pulled low (below 0.2×VIN), the LM3352MTC-3.0/NOPB enters shutdown mode with typical quiescent current of 2.5 µA and maximum of 5 µA. This state disables all switching activity and internal bias circuits, making it suitable for long-duration battery-powered sleep modes. The SD pin accepts standard CMOS logic levels and draws only 0.1–1.0 µA itself.

Is thermal protection active during continuous overload or short-circuit conditions on LM3352MTC-3.0/NOPB?

Yes - the LM3352MTC-3.0/NOPB integrates on-die thermal protection that disables the charge pump when junction temperature exceeds 150 °C. Once the die cools to a safe threshold (typically ~135 °C), operation automatically resumes. This behavior is verified under sustained short-circuit testing and prevents permanent damage during fault conditions without requiring external circuitry.