Analog Devices Inc. ADP3650JRZ-RL

Overview

ADP3650JRZ-RL from Analog Devices is a dual high-voltage MOSFET driver optimized for synchronous buck converters, featuring bootstrapped high-side drive, anti-crossconduction protection, and output disable (OD) functionality. It drives two N-channel MOSFETs with 45 ns propagation delay, 25 ns transition time, and supports 3 nF load at up to 500 kHz switching frequency in telecom and point-of-load power systems.

For engineers reviewing the ADP3650JRZ-RL datasheet, ADP3650JRZ-RL pinout, ADP3650JRZ-RL application, or ADP3650JRZ-RL equivalent, key selection criteria include bootstrap-enabled high-side gate drive capability, overlap protection timing, OD-controlled shutdown behavior, and SOIC_N package thermal performance in high-density DC/DC designs.

Technical Context

The ADP3650JRZ-RL integrates independent high-side and low-side drivers with adaptive overlap protection that monitors SW node voltage to enforce dead-time-requiring SW to fall below 1 V before enabling DRVL after DRVH turn-off. Its high-side driver uses external BST/SW bootstrap circuitry to sustain gate drive during floating operation, while the low-side driver operates referenced to PGND with internal VCC biasing.

Control logic accepts a single PWM input (IN) to generate complementary outputs: DRVH follows IN phase, DRVL is inverted; OD forces both outputs low. Propagation delays differ between paths-tpdhDRVH = 45 ns (typ), tpdhDRVL = 35 ns (typ)-and OD-to-output delays are asymmetric: 55 ns (OD→DRVH) vs. 190 ns (OD→DRVL), reflecting distinct internal signal routing.

Key Specifications

Pinout & Package

ADP3650JRZ-RL is supplied in an 8-lead SOIC_N (R-8) package with standard 1.27 mm pitch, 5.00 mm × 3.95 mm body, and exposed thermal pad not connected internally-PGND must be externally tied to the pad on PCB per AN-772 guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5113MMX/NOPB and MP6610DS-LF-Z, ADP3650JRZ-RL uniquely combines factory-trimmed adaptive overlap, SOIC_N industrial temperature rating, and matched high/low-side drive strength-making it optimal for telecom and medical buck converters demanding robustness without external timing tuning.

Availability

ADP3650JRZ-RL is available at Aetrix Electronics and suitable for telecom point-of-load conversion, industrial FPGA power delivery, and medical imaging DC/DC applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADP3650JRZ-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 since 1965.

The ADP3650JRZ-RL belongs to Analog Devices' power management driver portfolio, engineered specifically for high-efficiency, high-reliability synchronous buck converters in space-constrained, thermally demanding environments.

FAQ

What is the maximum switching frequency supported by the ADP3650JRZ-RL?

The ADP3650JRZ-RL is characterized to drive a 3 nF load at speeds up to 500 kHz, with timing parameters guaranteed over −40°C to +85°C. At 25°C and 12 V VCC, typical rise/fall times are 20–40 ns, enabling stable operation at 500 kHz in well-layouted PCBs with minimal parasitic inductance. Performance beyond 500 kHz depends on external MOSFET gate charge and layout quality.

Does the ADP3650JRZ-RL require external bootstrap components, and what are the key selection criteria?

Yes, the ADP3650JRZ-RL requires external bootstrap components: a diode (D1), two capacitors (CBST1, CBST2), and a series resistor (RBST). CBST1 must withstand ≥2× VCC (min 50 V rating); CBST1/CBST2 values are calculated from high-side MOSFET gate charge and desired VGATE. RBST (1.5–2.2 Ω) limits switch-node slew rate and peak diode current. These values are derived directly from equations in the ADP3650JRZ-RL datasheet Section "Bootstrap Circuit".

How does the overlap protection circuit in the ADP3650JRZ-RL prevent shoot-through?

The ADP3650JRZ-RL overlap protection monitors the SW pin voltage to enforce dead-time: after DRVH turns off, DRVL is held off until SW falls below 1 V-or for a fixed 150 ns if SW does not go high first. This adaptive method ensures Q1 is fully off before Q2 turns on, regardless of temperature, supply voltage, or MOSFET gate charge variation. The circuit is fully integrated and requires no external configuration.

What is the function of the OD pin on the ADP3650JRZ-RL, and how does it affect both driver outputs?

The OD (Output Disable) pin on the ADP3650JRZ-RL is an active-low control that forces both DRVH and DRVL outputs low simultaneously, disconnecting both external MOSFET gates. This prevents rapid discharge of the output capacitor during system shutdown or fault conditions. OD response is asymmetric: DRVH disables within 55 ns (max), DRVL within 190 ns (max), prioritizing high-side turn-off integrity.

Can the ADP3650JRZ-RL drive high-side and low-side MOSFETs with different gate thresholds or sizes?

Yes, the ADP3650JRZ-RL independently drives high-side and low-side N-channel MOSFETs with differing gate characteristics. Its high-side driver (DRVH) sources 2.5–3.9 Ω and sinks 1.4–2.6 Ω, while the low-side driver (DRVL) provides matched strength. Designers select MOSFETs based on gate charge (Qg), Rds(on), and dV/dt ratings-per the ADP3650JRZ-RL datasheet's "MOSFET Selection" section-and may add external gate resistors to fine-tune switching behavior.