Analog Devices Inc. ADP3650JRZ

Overview

ADP3650JRZ from Analog Devices is a dual, bootstrapped 12 V MOSFET driver optimized for synchronous buck converters driving two N-channel MOSFETs. It delivers 45 ns propagation delay, 25 ns transition time, and integrated anti-crossconduction protection - enabling robust high-frequency (up to 500 kHz) point-of-load regulation in FPGA and ASIC power supplies.

For engineers reviewing the ADP3650JRZ datasheet, ADP3650JRZ pinout, ADP3650JRZ application, or ADP3650JRZ equivalent, key selection criteria include bootstrap-enabled high-side drive capability, output disable (OD) functionality for controlled shutdown, overlap protection timing, thermal performance in SOIC_N, and compatibility with 3 nF gate loads at 12 V supply.

Technical Context

The ADP3650JRZ implements adaptive overlap protection by monitoring the SW node voltage to enforce dead-time between high-side (DRVH) and low-side (DRVL) switching - preventing shoot-through even under wide temperature (−40°C to +85°C), supply (4.15 V–13.2 V), and load (3 nF) variations. Its high-side driver uses external BST/SW bootstrap circuitry to sustain floating gate drive, while the low-side driver operates referenced to PGND with internal VCC biasing.

Control logic accepts a single PWM input (IN) to generate complementary, phase-controlled outputs: DRVH follows IN (in-phase), DRVL is inverted (180° out-of-phase). The OD pin forces both outputs low synchronously, with 35 ns disable propagation delay, ensuring safe discharge of output capacitors during system shutdown.

Key Specifications

Pinout & Package

ADP3650JRZ is packaged in an 8-lead SOIC_N (R-8) with exposed pad not internally connected - requires external PCB connection between PGND pin and exposed pad for optimal thermal and grounding performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual N-channel MOSFET driver applications.

Compared with LM5109BMM/NOPB and MP6610DJ-LF-Z, ADP3650JRZ uniquely combines bootstrap-enabled high-side drive, adaptive SW-sensed overlap protection, output disable, and full −40°C to +85°C qualification in a single SOIC_N package - making it optimal for industrial and telecom synchronous buck designs demanding reliability and integration.

Availability

ADP3650JRZ is available at Aetrix Electronics and suitable for telecom point-of-load regulation, FPGA core voltage supply, and ASIC power delivery systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADP3650JRZ 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, and communications markets.

The ADP3650JRZ belongs to Analog Devices' power management driver product line, engineered specifically for high-efficiency, high-frequency synchronous buck converters in space-constrained and thermally demanding applications.

FAQ

What is the maximum gate load capacitance supported by ADP3650JRZ at 12 V supply?

The ADP3650JRZ is characterized to drive a 3 nF load with 25 ns transition time and 45 ns propagation delay at VCC = 12 V and TA = 25°C. Performance degrades gradually beyond 3 nF - Figure 10 and Figure 11 show rise/fall times increasing to ~35 ns at 5 nF. For reliable 500 kHz operation, keep total gate capacitance ≤3 nF per side using appropriate MOSFET selection and layout.

Does ADP3650JRZ require an external bootstrap diode, and what specifications are critical?

Yes, ADP3650JRZ requires an external bootstrap diode connected between VCC and BST. Per the datasheet, it must have ≥15 V reverse voltage rating to withstand BST–SW transients, and average forward current must support f_MAX × Q_GATE. For example, at 500 kHz and 12 nC gate charge, average current is ~6 mA - a 1N4148 or similar small-signal diode suffices if peak surge rating exceeds (VCC − V_D)/R_BST.

How does the ADP3650JRZ implement overlap protection without external components?

The ADP3650JRZ implements overlap protection by continuously monitoring the SW pin voltage. When IN goes low, it delays DRVL turn-on until SW falls to ≤1 V - confirming high-side MOSFET turn-off. If SW fails to reach 1 V within 190 ns, DRVL activates regardless. This adaptive timing, combined with fixed 150 ns delay if SW doesn't go high first, eliminates shoot-through without external timing resistors or logic.

Can ADP3650JRZ operate with a 5 V VCC supply, and how does performance change?

Yes, ADP3650JRZ operates with VCC as low as 4.15 V. At 5 V, output resistance increases (e.g., high-side sourcing rises to ~4.5 Ω), propagation delay extends (~60 ns typ), and drive strength decreases - limiting usable gate capacitance to ~1.5 nF for 500 kHz. Figure 14 confirms DRVL output voltage drops to ~4.2 V at 5 V VCC, so ensure MOSFET V_GS(th) and gate charge allow full enhancement.

What is the thermal resistance (θ_JA) of ADP3650JRZ in its SOIC_N package, and how does PCB layout affect it?

ADP3650JRZ in the 8-lead SOIC_N (R-8) package has θ_JA = 123°C/W on a 2-layer board and 90°C/W on a 4-layer board per JEDEC standards. Layout critically impacts thermal performance: connecting the PGND pin directly to a large copper pour, using multiple vias to inner ground planes, and placing the VCC bypass capacitor within 2 mm of VCC/PGND pins reduce junction temperature rise by up to 25°C at 5 mA supply current.