Analog Devices Inc. ADP3118JRZ

Overview

ADP3118JRZ from onsemi is a dual high-voltage MOSFET driver optimized for synchronous buck converters, featuring bootstrapped high-side drive, anticross-conduction protection, and output disable (OD) control to float both outputs per Intel VRM 10. It drives 3000 pF loads with 25 ns propagation delay and 25 ns transition time, targeting multiphase desktop CPU power supplies.

For engineers reviewing the ADP3118JRZ datasheet, ADP3118JRZ pinout, ADP3118JRZ application, or ADP3118JRZ equivalent, key selection criteria include bootstrap-compatible high-side drive capability, OD-controlled shutdown behavior, overlap protection timing, thermal performance in SOIC-8, and compatibility with Flex-Mode™ controllers for VRD 10 compliance.

Technical Context

The ADP3118JRZ 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. Its high-side driver uses external BST/SW bootstrap circuitry with internal Boot-Snap support (RBST, CBST1/CBST2) to manage slew rate and gate voltage integrity during fast switching.

Control logic accepts a single PWM input (IN) to generate complementary DRVH/DRVL outputs with built-in shoot-through prevention. The OD pin forces both outputs low, disabling both MOSFETs to prevent rapid output capacitor discharge during system shutdown-critical for controlled CPU power-down sequences.

Key Specifications

Pinout & Package

ADP3118JRZ is packaged in an 8-lead SOIC_N (R-8) with standard pin spacing and gull-wing leads, rated for 2-layer board θJA = 123°C/W and 4-layer board θJA = 90°C/W. Thermal pad is not present; PGND must be connected directly to low-inductance ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-side/low-side MOSFET driver applications.

Compared with IR2110PbF and LM5113MMX/NOPB, ADP3118JRZ uniquely integrates SW-node–based overlap protection, OD-controlled shutdown, and VRM 10–optimized timing-making it the only choice for Intel-compliant desktop CPU power stages requiring guaranteed nonoverlap and controlled capacitor discharge.

Availability

ADP3118JRZ is available at Aetrix Electronics and suitable for multiphase desktop CPU supplies, VRD 10-compliant reference designs, and single-supply synchronous buck converters requiring stable component supply and long-term production continuity.

Supply support for ADP3118JRZ 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering power management, analog, sensor, and logic solutions for automotive, industrial, and computing markets.

The ADP3118JRZ belongs to onsemi's CPU power delivery portfolio, designed specifically to support Intel VRM specifications with integrated safety features, precise timing, and robust gate drive for high-frequency synchronous buck converters.

FAQ

What is the purpose of the OD pin on the ADP3118JRZ?

The OD (Output Disable) pin on the ADP3118JRZ is an active-low control input that forces both DRVH and DRVL outputs low simultaneously. This action turns off both high-side and low-side external MOSFETs, allowing the output to float and preventing rapid discharge of the output capacitor during system shutdown or fault conditions-meeting Intel VRM 10 requirements for controlled power-down sequences.

Does the ADP3118JRZ require external bootstrap components?

Yes, the ADP3118JRZ requires external bootstrap components: a diode (D1), two capacitors (CBST1 and CBST2), and a resistor (RBST). These form the Boot-Snap circuit connected between BST and SW pins. CBST1 must withstand ≥50 V, and RBST (1.5–2.2 Ω) limits surge current and controls switch-node slew rate-details are specified in the ADP3118JRZ datasheet Application Information section.

Can the ADP3118JRZ drive high gate-charge MOSFETs effectively?

The ADP3118JRZ is optimized for low gate-charge MOSFETs but can drive higher-Qg devices with appropriate layout and external gate resistors. Its low-side sinking resistance (1.0–2.5 Ω) and high-side sourcing resistance (2.2–3.5 Ω) support fast switching into 3 nF loads. For MOSFETs exceeding 3000 pF, adding series gate resistors may be necessary to manage dV/dt and prevent oscillation-verified in typical performance curves on page 7 of the ADP3118JRZ datasheet.

How does the ADP3118JRZ prevent shoot-through current?

The ADP3118JRZ prevents shoot-through using adaptive overlap protection that monitors the SW pin voltage. Before enabling DRVL after high-side turn-off, it waits for SW to fall below ~1 V-or applies a fixed 150 ns delay if SW fails to rise first. This ensures the high-side MOSFET is fully off before the low-side turns on, regardless of temperature, supply variation, or MOSFET gate charge-eliminating shoot-through under all operating conditions.

Is the ADP3118JRZ compatible with Flex-Mode™ controllers?

Yes, the ADP3118JRZ is explicitly designed to meet CPU VR requirements when used with Analog Devices, Inc. Flex-Mode™ controllers such as the ADP3186 and ADP3188. Its timing characteristics-including propagation delay, transition time, and OD response-are aligned with VRD 10.x specifications, and its functional block diagram and application circuits (e.g., Figure 15) confirm interoperability in production-grade VRM implementations.