Analog Devices Inc./Maxim Integrated MAX5005BCUB

Overview

MAX5005BCUB from Maxim Integrated is a 3.3V, 150mA USB-specific LDO voltage regulator with integrated ±15kV TVS protection on D+/D− lines, open-drain active-low reset output, and pin-selectable 1.5kΩ USB termination resistors-designed for powering USB peripheral microcontrollers while providing robust ESD immunity and power-on reset timing.

For engineers reviewing the MAX5005BCUB datasheet, MAX5005BCUB pinout, MAX5005BCUB application, or MAX5005BCUB equivalent, key selection considerations include its 25µA quiescent current at full load, 300mV dropout at 150mA, 100ms reset timeout, open-drain RESET output logic, and µMAX-10 package compatibility with USB 1.1 low/full-speed termination requirements.

Technical Context

The MAX5005BCUB integrates an LDO regulator core with a dedicated µP reset supervisor sharing the same reference voltage, enabling precise 3.3V regulation (±3%) and reset assertion when VOUT falls below −7.5% or −12.5% threshold variants (B suffix = 12.5%). Its proprietary shunt-type TVS circuit protects D+ and D− without signal delay, delivering ±15kV air-discharge ESD immunity per IEC 61000-4-2.

Reset behavior is tightly coupled to regulator operation: RESET remains asserted for ≥100ms after VOUT rises above threshold or MR transitions high, with 75µs VOUT-to-reset delay and 500ns MR-to-reset propagation. Termination resistor selection (D+ or D−) is controlled via SELR/ENR logic pins, and output-to-input reverse leakage protection eliminates need for external blocking diodes.

Key Specifications

Pinout & Package

MAX5005BCUB is housed in a 10-pin µMAX package (3.0mm × 3.0mm, 0.5mm pitch), with exposed thermal pad on underside for enhanced heat dissipation. GND pins (3 and 9) serve dual electrical and thermal roles and must be soldered to large PCB ground planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB LDO regulator applications.

Compared with MAX5005BCUB, MAX5006BCUB offers simplified reset interface at no cost to regulation or protection specs, while TUSB2036IRHBR trades integration for higher data rate but demands additional discrete components to match MAX5005BCUB's system-level readiness.

Availability

MAX5005BCUB is available at Aetrix Electronics and suitable for USB peripheral power management, hand-held instrumentation, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and guaranteed ESD immunity.

Supply support for MAX5005BCUB 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high-reliability, low-power, and system-integration solutions.

The MAX5005/MAX5006/MAX5007 product line was engineered specifically for USB 1.1 peripheral systems needing consolidated power regulation, ESD protection, and reset supervision in minimal footprint-replacing multi-component discrete implementations.

FAQ

What is the reset threshold voltage for MAX5005BCUB?

The MAX5005BCUB uses the "B" reset threshold variant, specifying a nominal reset threshold of 2.89V with a guaranteed range of 2.75V to 3.01V. This corresponds to approximately −12.5% deviation from the 3.3V output, ensuring reset assertion well before USB peripheral logic becomes unreliable. The threshold is factory-trimmed and referenced to the internal bandgap, not externally adjustable.

Does MAX5005BCUB require an external pullup resistor on the RESET pin?

Yes, MAX5005BCUB features an open-drain RESET output, so it requires an external pullup resistor (typically 10kΩ to VCC or VOUT) to generate a valid logic-high level when reset is inactive. This configuration allows wired-OR reset bus architectures and avoids contention with other reset sources. The datasheet confirms no internal pullup exists on the RESET pin of MAX5005BCUB.

Can MAX5005BCUB support both USB low-speed and full-speed peripherals?

Yes, MAX5005BCUB supports both USB low-speed (1.5Mbps) and full-speed (12Mbps) peripherals via the SELR pin: logic low selects 1.5kΩ termination on D− (for low-speed), and logic high selects termination on D+ (for full-speed). ENR must be held low to enable termination. This pin-selectable architecture eliminates the need for board-level jumpers or different SKUs.

What is the minimum output capacitor required for stable operation of MAX5005BCUB?

MAX5005BCUB requires a minimum 1µF ceramic output capacitor (X7R or X5R dielectric recommended) placed close to the OUT and GND pins for stable operation across temperature and load conditions up to 150mA. Using smaller capacitors (e.g., 0.47µF) may cause instability or excessive noise; larger values (e.g., 10µF) improve transient response and PSRR without compromising stability.

How does MAX5005BCUB handle reverse current flow from OUT to IN?

MAX5005BCUB includes integrated output-to-input reverse leakage protection that actively disables the pass transistor and parasitic paths when VOUT > VIN, preventing backfeed current. This allows safe operation in dual-power scenarios (e.g., battery backup + USB VBUS) without external blocking diodes-reducing voltage drop, heat, and component count. The feature is inherent to the IC's internal architecture and requires no configuration.