Analog Devices Inc. DC1237A-B

Overview

DC1237A-B from Analog Devices (formerly Linear Technology) is a demonstration circuit for the LTC3527EUD-1 dual synchronous boost converter IC, configured with active output pull-down for rapid capacitor discharge during manual shutdown. It supports two independent boost channels (800mA/400mA), input range 0.7V–5.5V, selectable output voltages (1.8V/2.85V/3.3V/3V/5V), and operates in BURST or fixed-frequency (1.2MHz/2.2MHz) modes.

For engineers reviewing the DC1237A-B datasheet, DC1237A-B pinout, DC1237A-B application, or DC1237A-B equivalent, this board enables rapid evaluation of low-voltage startup (700mV), sub-1V hold-up operation (500mV at light load), output sequencing, independent shutdown control, and Power-Good monitoring in dual-output portable power systems.

Technical Context

DC1237A-B implements the LTC3527EUD-1 IC in a 16-pin 3×3 mm QFN package, featuring two fully independent synchronous boost regulators with separate input terminals, individual ON/OFF and Power-Good signals, and jumper-selectable configuration for output voltage, mode (BURST/PWM), and switching frequency. Each channel includes output disconnect capability.

The board supports input paralleling via JP1, output sequencing via PGOOD-to-SHDN interconnection, and active pull-down on VOUT1/VOUT2 during shutdown - a distinguishing feature of the LTC3527EUD-1 variant versus the base LTC3527EUD. Startup is functional down to 700mV input; regulation sustains down to 500mV under light load.

Key Specifications

Availability

DC1237A-B is available at Aetrix Electronics and suitable for portable medical sensors, energy-harvesting nodes, coin-cell–powered IoT peripherals, and ultra-low-voltage battery backup systems requiring stable component supply and validated dual-output boost performance.

Supply support for DC1237A-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 designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications applications.

The LTC3527 family targets ultra-low-input-voltage DC/DC conversion in space-constrained, battery- or energy-harvesting–powered systems where startup below 1V and regulated hold-up near 500mV are critical design requirements.

FAQ

What is the primary function of the DC1237A-B demonstration circuit?

The DC1237A-B is a fully assembled evaluation platform for the LTC3527EUD-1 dual synchronous boost converter. It enables immediate validation of key features including sub-1V startup (700mV), 500mV hold-up operation, independent channel control, output sequencing, and active pull-down shutdown - all without requiring PCB layout or component sourcing. The DC1237A-B provides test points, jumpers, and terminals for rapid lab characterization of the LTC3527EUD-1's performance.

How does DC1237A-B differ from DC1237A-A?

DC1237A-B implements the LTC3527EUD-1 variant, which includes active pull-down circuitry to rapidly discharge output capacitors during manual shutdown - a feature absent in the base LTC3527EUD used on DC1237A-A. This results in faster output voltage collapse and improved system-level safety during controlled power-down sequences. Both boards share identical jumper-based configuration options and mechanical layout, but only DC1237A-B supports this fast-discharge behavior.

Which output voltage combinations are supported on DC1237A-B?

DC1237A-B supports six discrete output configurations via JP7 and JP8 jumpers: CH1 outputs 3V, 3.3V, or 5V; CH2 outputs 1.8V, 2.85V, or 3.3V. Combinations are independent - e.g., CH1 = 5V and CH2 = 1.8V is valid. No single jumper setting enables simultaneous 5V/3.3V; each channel's voltage is selected separately. All settings maintain ±3% regulation across specified load and input conditions per Table 1.

Can DC1237A-B operate with input voltage higher than output voltage?

Yes, DC1237A-B - through its underlying LTC3527EUD-1 - supports input voltages exceeding output voltage while maintaining regulation, though maximum output current and efficiency decrease significantly in that region. This pass-through capability allows flexible use across varying battery states or hybrid supply scenarios. However, full rated current (800mA/400mA) and peak efficiency (>88%) are only achieved when VIN < VOUT, as confirmed in the DC1237A-B Quick Start Guide and LTC3527 datasheet.

What is the purpose of the JP1 "PARALLEL" jumper on DC1237A-B?

The JP1 jumper on DC1237A-B selects whether the two boost converter inputs (VIN1 and VIN2) are operated independently or paralleled. In "PARALLEL" position, VIN1 and VIN2 are shorted, allowing a single input source to power both channels - simplifying bench testing and reducing supply count. In "SINGLE" position, VIN1 and VIN2 remain isolated, enabling true dual-input operation such as separate battery cells or asymmetric supply rails, with JP2 selecting which input dominates sequencing logic.