Texas Instruments LM3354-1.8EVAL

Overview

LM3354-1.8EVAL from Texas Instruments is an obsolete evaluation board for the LM3354 1.8V fixed-output switched-capacitor DC/DC converter, designed to deliver up to 90mA output current with buck-boost topology and no inductor requirement. It supports white/blue LED biasing and portable low-voltage rail generation using four external ceramic capacitors.

For engineers reviewing the LM3354-1.8EVAL datasheet, LM3354-1.8EVAL pinout, LM3354-1.8EVAL application, or LM3354-1.8EVAL equivalent, this board enables rapid validation of LM3354-based 1.8V power conversion in space-constrained LED driver and battery-powered systems where inductor-free regulation is critical.

Technical Context

The LM3354-1.8EVAL implements a charge-pump architecture with fixed 1.8V output derived from a 2.7V–5.5V input range, using internal switching control and external 0.33µF flying capacitors (C1/C2) plus 10µF input/output bulk capacitors. Regulation is achieved via gain selection (×1, ×1.33, ×1.5, ×2) without feedback resistors.

This board is configured specifically for the LM3354 variant-not the LM3355-and reflects TI's AN-1214 reference design with verified layout, component values (CIN=COUT=10µF X5R/6.3V; C1=C2=0.33µF X7R/16V; CFIL=1µF X7R/10V), and 1.8V output programming per SNVS157 specification.

Key Specifications

Availability

LM3354-1.8EVAL is available at Aetrix Electronics and suitable for LED backlighting, portable medical sensors, and low-noise analog supply generation requiring stable component supply and legacy design support.

Supply support for LM3354-1.8EVAL 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, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.

The LM3354-1.8EVAL belongs to TI's Power Management portfolio, specifically the switched-capacitor DC/DC converter product line engineered for inductorless, low-EMI power conversion in compact portable devices.

FAQ

What is the primary function of the LM3354-1.8EVAL evaluation board?

The LM3354-1.8EVAL evaluation board is a fully assembled reference platform for validating the LM3354 1.8V fixed-output switched-capacitor DC/DC converter. It demonstrates buck-boost operation from 2.7V–5.5V input to a stable 1.8V output at up to 90mA, using only ceramic capacitors-no inductor required. The LM3354-1.8EVAL enables fast prototyping of low-noise, space-efficient power rails in portable applications.

Does the LM3354-1.8EVAL support adjustable output voltage?

No. The LM3354-1.8EVAL is configured exclusively for 1.8V fixed output, matching the LM3354-1.8 device variant. Unlike programmable versions, it uses internal gain selection and requires no external feedback network. Output voltage cannot be modified without hardware changes or substitution with a different LM3354 variant (e.g., LM3354-2.5 or LM3354-3.3). The LM3354-1.8EVAL does not support resistor-divider adjustment.

What are the key external components used on the LM3354-1.8EVAL board?

The LM3354-1.8EVAL uses five passive components: CIN and COUT (10µF/6.3V X5R ceramic), C1 and C2 (0.33µF/16V X7R ceramic flying capacitors), and CFIL (1µF/10V X7R ceramic filter capacitor). These values are specified in TI's AN-1214 and validated per SNVS157. No inductors, diodes, or resistors are required-making the LM3354-1.8EVAL a minimal, high-efficiency solution.

Is the LM3354-1.8EVAL still in production or recommended for new designs?

No. The LM3354-1.8EVAL is marked OBSOLETE in TI's documentation (SNVA045D, revised April 2013) and is not recommended for new designs. It remains available through authorized distributors for legacy system support and repair. Engineers designing new products should consult TI's current portfolio of inductorless regulators (e.g., TPS6040x series) instead of relying on the LM3354-1.8EVAL.

Can the LM3354-1.8EVAL be used to evaluate the LM3355 converter?

No. The LM3354-1.8EVAL is designed specifically for the LM3354, which delivers up to 90mA output current. The LM3355 is a separate device rated for 50mA and uses different internal gain logic and pin compatibility. Although both share the same board footprint in the AN-1214 family, the LM3354-1.8EVAL's component layout, capacitor values, and output programming are optimized for the LM3354-not the LM3355. Substituting the LM3355 on the LM3354-1.8EVAL is not supported.