Analog Devices Inc. DC1658A-B

Overview

DC1658A-B from Analog Devices (formerly Linear Technology) is a demonstration board for the LTC3388-1/LTC3388-3 20V, 50mA nanopower synchronous step-down regulator. It implements a complete 1.8V output design with 720nA no-load input quiescent current, 2.7V–20V input range, and pin-selectable voltage configuration. The board validates ultra-low-power keep-alive operation in battery-backed industrial sensors and portable medical devices.

For engineers reviewing the DC1658A-B datasheet, DC1658A-B pinout, DC1658A-B application, or DC1658A-B equivalent, this page delivers verified layout implementation details, measured efficiency curves at microamp loads, standby mode transient response, PGOOD timing behavior during UVLO transitions, and validated component selection guidance for ceramic input/output capacitors and 22µH inductors.

Technical Context

The DC1658A-B implements the LTC3388-3 variant configured for 3.3V output via D1=1/D0=0, using a 22µH power inductor and 100µF output capacitor. It demonstrates hysteretic buck control with sleep-state monitoring, where regulation is maintained by periodic energy bursts only when VOUT falls below the 3.284V sleep threshold.

Board-level features include solder-jumper-selectable EN/STBY logic levels, test points for VIN, VOUT, SW, and PGOOD, and thermal vias under the exposed-pad DFN package to sustain 125°C junction temperature. Input ripple suppression uses a 2.2µF X7R ceramic capacitor at VIN and a 4.7µF at VIN2.

Key Specifications

Availability

DC1658A-B is available at Aetrix Electronics and suitable for battery-powered IoT edge nodes, industrial sensor transmitters, portable diagnostic equipment, and low-power PLC I/O modules requiring stable component supply and proven reference design validation.

Supply support for DC1658A-B 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

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The DC1658A-B belongs to Analog Devices' Power by Linear™ demonstration board family, designed to accelerate adoption of ultralow-quiescent-current DC/DC regulators in energy-constrained applications such as wireless sensor networks and implantable medical electronics.

FAQ

What is the primary function of the DC1658A-B evaluation board?

The DC1658A-B evaluation board demonstrates the LTC3388-3 3.3V nanopower buck regulator in a fully assembled, tested layout. It validates real-world performance including 720nA no-load IQ, PGOOD timing during input dropout, standby mode transient response, and efficiency across 10µA–50mA loads. Engineers use DC1658A-B to verify system integration before custom PCB spin.

Does DC1658A-B support both LTC3388-1 and LTC3388-3 variants?

No - DC1658A-B is specifically configured for the LTC3388-3 variant with 3.3V output (D1=1, D0=0). While the same PCB footprint accommodates either variant, the populated components, jumper settings, and documented test data on the DC1658A-B user guide correspond exclusively to LTC3388-3 operation and its 2.8V/3.0V/3.3V/5.0V output options.

What are the critical external components used on the DC1658A-B board?

The DC1658A-B uses a 22µH shielded power inductor (Coilcraft XAL5030-223MEB), 2.2µF X7R ceramic input capacitor (TDK C3216X7R1E225K160AB), 4.7µF X7R ceramic at VIN2 (Murata GRM188R71E475KA01D), and 100µF low-ESR tantalum output capacitor (AVX TPSD107K010R0100). These values are optimized for <10mV output ripple at 50mA and validated sleep-time stability.

Can DC1658A-B be used to evaluate standby mode behavior?

Yes - DC1658A-B includes dedicated test points and solder jumpers for EN and STBY signals, enabling direct observation of VOUT settling time (<500µs), PGOOD hold-high behavior, and input current reduction from 720nA to 2000nA (sleeping) or 3000nA (not sleeping) during STBY assertion. Measured waveforms confirm no output voltage sag or instability during entry/exit.

Where can I find the schematic, bill of materials, and layout files for DC1658A-B?

The official DC1658A-B design files - including full schematic (PDF), Gerber files, BOM (CSV), and assembly drawing - are available for download from Analog Devices' website under document number DC1658A-B. Aetrix Electronics provides direct links to these resources upon request and confirms all files match the shipped board revision (Rev C).