Analog Devices Inc. ADP3650JCPZ-RL

Overview

ADP3650JCPZ-RL from Analog Devices is a dual, bootstrapped 12 V MOSFET driver optimized for synchronous buck converters, featuring integrated anti-crossconduction protection, output disable (OD) functionality, and capability to drive 3000 pF loads with 45 ns propagation delay and 25 ns transition time. It drives two N-channel MOSFETs-one high-side (bootstrapped) and one low-side-in telecom, industrial, and point-of-load applications powering FPGAs and ASICs.

For engineers reviewing the ADP3650JCPZ-RL datasheet, ADP3650JCPZ-RL pinout, ADP3650JCPZ-RL application, or ADP3650JCPZ-RL equivalent, key selection criteria include bootstrap-enabled high-side drive, OD-controlled shutdown, −40°C to +85°C operation, LFCSP package thermal performance, and overlap protection timing behavior under varying load capacitance and temperature.

Technical Context

The ADP3650JCPZ-RL implements adaptive overlap protection by monitoring the SW node voltage to enforce turn-off of the high-side MOSFET before enabling the low-side driver-requiring SW to fall to ≤1 V or applying a fixed 150 ns delay. Its high-side driver uses external BST/SW bootstrap circuitry with internal charge-pump logic, while the low-side driver operates referenced to PGND with VCC bias.

Timing is defined at 10%/90% thresholds; propagation delays range from 12 ns (tpdhDRVL) to 70 ns (tpdhDRVH), and transition times are specified for 3 nF loads. The OD pin asserts within 20–55 ns to force both DRVH and DRVL low, preventing output capacitor discharge during system shutdown.

Key Specifications

Pinout & Package

The ADP3650JCPZ-RL is housed in an 8-lead LFCSP (3 mm × 3 mm, 0.75 mm height, CP-8-13), with exposed pad thermally and electrically connected to PGND on PCB per AN-772 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5113SD/NOPB and MP6610DQKT-LF-Z, the ADP3650JCPZ-RL uniquely integrates adaptive SW-sensed overlap protection and a dedicated OD pin-enabling safer, simpler, and more reliable synchronous buck implementation without external timing or shutdown logic.

Availability

ADP3650JCPZ-RL is available at Aetrix Electronics and suitable for telecom point-of-load conversion, industrial FPGA power supplies, and medical imaging DSP rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADP3650JCPZ-RL 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 ADP3650 product line delivers highly integrated, thermally optimized MOSFET drivers for nonisolated synchronous buck converters-designed specifically to simplify high-efficiency, high-density power supply design in space-constrained applications.

FAQ

What is the maximum allowable BST-to-SW voltage for ADP3650JCPZ-RL?

The ADP3650JCPZ-RL supports a BST-to-SW voltage up to +15 V DC or +35 V for pulses under 200 ns. This rating enables reliable operation with fast-switching N-MOSFETs in 12 V and 24 V input buck stages. Exceeding these limits risks permanent damage to the high-side driver output stage. Always verify BST capacitor voltage rating exceeds 2× maximum input voltage.

How does the ADP3650JCPZ-RL implement overlap protection without external components?

The ADP3650JCPZ-RL implements overlap protection by continuously monitoring the SW pin voltage. When IN transitions low, it waits for SW to fall below 1 V before enabling DRVL; if SW fails to reach that threshold within 190 ns, DRVL activates unconditionally. This adaptive timing eliminates need for external RC networks or dead-time controllers while ensuring shoot-through prevention across temperature and load variations.

Can ADP3650JCPZ-RL drive GaN HEMTs in a synchronous buck configuration?

The ADP3650JCPZ-RL can drive enhancement-mode GaN HEMTs provided gate drive requirements fall within its specifications: ≤10 V gate voltage, ≤3 nF total gate capacitance, and compatible logic thresholds. However, due to GaN's faster switching and higher dV/dt, external gate resistors and careful PCB layout (minimizing SW node loop inductance) are essential. The ADP3650JCPZ-RL's 25 ns transition time and 2.5 Ω high-side drive make it suitable for moderate-frequency GaN designs up to 1 MHz.

What is the thermal resistance (θJA) of ADP3650JCPZ-RL in its LFCSP package?

The ADP3650JCPZ-RL has a junction-to-ambient thermal resistance (θJA) of 50°C/W when mounted on a 4-layer PCB with the exposed pad properly soldered to a thermal plane. This value assumes JEDEC Std test conditions and reflects superior heat dissipation versus SOIC_N (θJA = 90°C/W). For accurate thermal design, use θJC = 12°C/W (junction-to-case) with IR thermography or thermal simulation.

Does ADP3650JCPZ-RL require external bootstrap diodes and capacitors?

Yes, ADP3650JCPZ-RL requires an external bootstrap diode (≥15 V rating) and capacitor (CBST1/CBST2) between BST and SW pins. The diode charges CBST1 during low-side conduction; CBST2 and RBST limit dV/dt and ringing. Recommended values depend on MOSFET gate charge-for example, 12 nF CBST1 and 6.8 nF CBST2 for a 12 nC gate charge device at 7 V gate drive. Ceramic capacitors with X7R dielectric are strongly advised.