Analog Devices Inc. ADP1829ACPZ-R7

Overview

ADP1829ACPZ-R7 from Analog Devices is a dual, interleaved, synchronous step-down DC-to-DC controller supporting independent 0.6 V to 85% VIN outputs, fixed 300 kHz/600 kHz or synchronized up to 1 MHz operation, ±0.85% FB regulation accuracy at 0°C to 70°C, and voltage tracking for DDR termination and power sequencing in telecom and medical imaging systems.

For engineers reviewing the ADP1829ACPZ-R7 datasheet, ADP1829ACPZ-R7 pinout, ADP1829ACPZ-R7 application, or ADP1829ACPZ-R7 equivalent, key selection criteria include interleaved current-limit sensing, lossless RDSON-based overcurrent protection, independent Power OK outputs, 180° phase-shifted switching for reduced input ripple, and LFCSP-32 package thermal performance in high-density POL designs.

Technical Context

The ADP1829ACPZ-R7 implements two independent voltage-mode PWM controllers with 180° interleaved switching, each using an internal error amplifier (70 dB open-loop gain, 20 MHz GBW) and adjustable lossless current-limit sensing referenced to PGND. Its oscillator supports pin-selectable 300 kHz or 600 kHz operation or external synchronization from 600 kHz to 2 MHz (with 2× divider logic).

Each channel features dedicated COMP/FB/TRK/SS pins, independent enable inputs (EN1/EN2), and open-drain Power OK outputs (POK1/POK2) with 8 µs propagation delay and 550 mV–750 mV UV/OV thresholds. The integrated 5 V LDO (VREG) delivers ≥100 mA with 4.75 V–5.25 V regulation across load and line, powering gate drivers and internal circuitry.

Key Specifications

Pinout & Package

ADP1829ACPZ-R7 is housed in a 5 mm × 5 mm, 32-lead LFCSP package with exposed thermal pad (EPAD) requiring connection to AGND for optimal thermal performance and EMI control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual interleaved buck controller applications.

Compared with TPS51220ARGER and ISL95831IRZ, the ADP1829ACPZ-R7 uniquely combines independent analog tracking inputs, lossless current sensing, and a self-contained 5 V LDO-making it optimal for custom industrial and medical POL designs where flexibility and analog precision outweigh digital control needs.

Availability

ADP1829ACPZ-R7 is available at Aetrix Electronics and suitable for telecommunications base stations, medical imaging detectors, DDR memory termination, set-top box SoC power, and industrial embedded processors requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for ADP1829ACPZ-R7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.

The ADP1829ACPZ-R7 belongs to Analog Devices' high-efficiency DC-to-DC controller product line, engineered for flexible, high-current point-of-load regulation in space-constrained, thermally demanding applications such as telecom infrastructure and medical imaging.

FAQ

What is the maximum supported switching frequency for ADP1829ACPZ-R7?

The ADP1829ACPZ-R7 supports a maximum switching frequency of 1 MHz per channel when synchronized to an external clock. With FREQ pin low, it operates at 300 kHz; with FREQ high, at 600 kHz. When SYNC is driven at 1.2 MHz–2 MHz, the internal divider yields 600 kHz–1 MHz output, enabling noise-sensitive designs to avoid AM radio bands or align with system clocks.

Does ADP1829ACPZ-R7 require external MOSFETs, and what types are recommended?

Yes, ADP1829ACPZ-R7 is a controller-only IC and requires external N-channel MOSFETs for both high-side and low-side switches. The datasheet references IRFR3709Z (high-side) and IRLR7807Z (low-side) in its typical application. It supports all-N-channel topologies with bootstrap gate drive, eliminating the need for P-channel devices and reducing conduction losses.

How does the tracking function work on ADP1829ACPZ-R7, and what configurations are supported?

The ADP1829ACPZ-R7 provides independent TRK1 and TRK2 inputs to implement voltage tracking during startup, shutdown, and faults. It supports both ratiometric tracking (e.g., VTT = VDDQ/2 for DDR) and coincident tracking (both outputs ramp simultaneously). The tracking error is limited to ±5 mV offset between TRKx and FBx, ensuring tight sequencing accuracy across temperature.

What is the role of the VREG pin on ADP1829ACPZ-R7, and can it power external circuitry?

The VREG pin on ADP1829ACPZ-R7 outputs a regulated 5.0 V ±2.5% supply capable of ≥100 mA, used internally for gate drivers and control logic. While technically usable for light auxiliary loads, Analog Devices advises against powering external circuitry from VREG due to sharp transient currents during switching-bypassing with ≥1 µF ceramic to AGND is mandatory, and dedicated regulators are preferred for system rails.

What thermal considerations apply to ADP1829ACPZ-R7 in high-power applications?

ADP1829ACPZ-R7 has a junction-to-ambient thermal resistance (θJA) of 45°C/W on a 4-layer JEDEC board, contingent on proper EPAD soldering to AGND. In high-power applications, thermal derating is required: maximum ambient temperature must be reduced per TA_MAX = 125°C − (θJA × PD_MAX). Layout guidelines emphasize minimizing thermal resistance via multiple vias under the EPAD and avoiding copper isolation around the package.