Analog Devices Inc./Maxim Integrated MAX1760EUB

Introduction to the MAX1760EUB Boost DC-DC Converter from Analog Devices and Maxim Integrated

The MAX1760EUB, designed by Analog Devices/Maxim Integrated, is a high-efficiency, low-noise step-up DC-DC converter tailored for power-critical handheld and battery-powered devices. Presented in the compact 10-pin μMAX or 10-pin TDFN package, it efficiently converts low input voltages, such as those from single- or multi-cell batteries, to regulated outputs suitable for modern RF, communications, and portable computing systems. With its robust set of features and emphasis on small size and low quiescent current, the MAX1760EUB directly addresses the demands of space-constrained and noise-sensitive portable electronics.

Main Features and Performance Characteristics of the MAX1760EUB

Engineered for versatility and efficiency, the MAX1760EUB offers impressive electrical and functional characteristics central to reliable embedded power management:

Input voltage range: 0.7V (sustained operation) to 5.5V, with guaranteed startup at 1.1V

Output voltage: Fixed 3.3V or adjustable from 2.5V to 5.5V

Maximum output current: Up to 800mA, supporting significant loads in portable designs

High efficiency: Up to 94%, supported by a synchronous-rectified PWM topology

Low-noise operation: 1MHz constant-frequency switching for reduced EMI, with forced-PWM and synchronizable PWM modes

Idle-mode™ circuitry for enhanced light-load efficiency and smooth automatic transition between switching modes

Ultra-low quiescent current in shutdown: 0.1µA for maximizing battery runtime

Adjustable current limit and analog soft-start for system optimization

Available in space-saving 10-pin μMAX and 3mm × 3mm TDFN packages for minimal footprint

Operating Principles and Distinctive Circuit Behavior of the MAX1760EUB

Central to the MAX1760EUB is its highly integrated boost switching regulator architecture, combining an internal N-channel MOSFET power switch, a P-channel synchronous rectifier, a precision 1.25V reference, and shutdown logic.

During operation, the MAX1760EUB boosts battery input (from 1 to 3 alkaline, NiCd, or NiMH cells, or a single Li-ion cell) to a regulated output. The regulation architecture supports:

Synchronous rectified PWM for high efficiency at medium to high loads

Pulse-frequency modulation (PFM) at light loads for minimal quiescent losses

Constant-frequency forced-PWM operation for applications sensitive to switching noise

External clock synchronization (500kHz to 1.2MHz) to avoid interference with RF communication bands

Proprietary Idle-mode™ for smooth, automatic switching between operation modes

Key operational safety and flexibility features include soft-start and programmable current limiting (via the ISET pin), ensuring both inrush current control and component tailoring for specific output requirements.

The reference output provides 1.25V within ±1% accuracy for feedback and optional external use (up to 50µA). Shutdown mode disables the converter’s internal circuits, dropping the quiescent current to negligible levels and allowing for battery-saving architectures in deeply embedded scenarios.

Design Guidelines and Application Notes for the MAX1760EUB

Selection of the MAX1760EUB is especially advantageous in compact, wireless, and battery-operated electronics, such as digital cordless phones, wireless handsets, palmtop computers, two-way pagers, and handheld measuring instruments. The stability and high efficiency achieved even at low input voltages are well-suited for single-cell and multi-cell portable device designs.

Key considerations include:

Ensuring proper mode selection—normal (automatic PFM/PWM), forced-PWM, or synchronized-PWM—for the intended electromagnetic environment and output ripple requirements

Employing the soft-start and adjustable current limit to safely manage inrush currents and protect both the converter and upstream sources during power-up

Observing the input and output voltage relationships, particularly allowing safe full-load operation only after output voltages exceed regulated thresholds (≥2.3V for standard operation)

Part Selection and Circuit Board Layout Recommendations for MAX1760EUB Projects

Optimal performance of the MAX1760EUB depends significantly on careful selection of external components and disciplined PCB design:

Inductor: A small 3.3µH surface-mount inductor rated at or slightly above the current limit ensures efficiency; use high-frequency ferrite cores and, where possible, shielded or toroidal types for reduced EMI

Schottky diode: Required for output voltages above 4V, and for reliable startup below 1.8V input. Choose fast, 0.5A-rated devices (e.g., MBR0520L, EP05Q03L, or 1N5817)

Input/output capacitors: Low-ESR designs (e.g., Sanyo POSCAP, Panasonic SP/CB, Kemet T510), values such as 33µF (input) and 100µF (output) are typical starting points, ensuring low ripple and effective transient support

Reference and bypass: 0.22μF (REF) and 0.68μF (OUT) ceramic capacitors, along with a 4.7Ω resistor between OUT and POUT, placed within 5mm of the IC pins

PCB layout demands particular attention to placement and trace design, as improper routing can introduce excessive EMI, degrade performance, and cause control loop instability. Critical power components (inductor, capacitors, Schottky diode, IC) should be placed close together with short, wide traces, while sensitive feedback paths must be shielded from noisy nodes (such as LX).

Mechanical, Environmental, and Packaging Specifications of the MAX1760EUB

To address thermal and space constraints in compact devices, the MAX1760EUB is available in 10-pin μMAX (0.118", 3.00mm width) and 3mm × 3mm TDFN packages. These packages adhere to JEDEC standards, with careful attention to coplanarity and warpage for reliable automated assembly.

From an environmental reliability standpoint:

Operating temperature range: -40°C to +85°C

MSL 1 (unlimited moisture sensitivity)

Absolute maximum junction temperature: 150°C

Storage temperature: -65°C to +150°C

Lead temperature for soldering: +300°C (for 10 seconds)

The maximum power dissipation varies with package and board type, with robust thermal design supported by package and layout choices.

Alternative or Substitute Devices for the MAX1760EUB

For design scenarios where the MAX1760EUB might need to be replaced, or where alternative sourcing is considered, reviewing both the MAX1760H (differing only in logic polarity for ON pin) and similar pin-compatible boost converters is advisable. Key comparative factors include:

Output voltage and current capabilities

Operating frequency and noise performance

Packaging compatibility and footprint

Programmable features (such as soft-start and current limiting)

Examples of functionally comparable devices from Maxim Integrated or other leading manufacturers may include boost converters with synchronous rectification, adjustable output, and similar quiescent current and operating voltage ranges.

Conclusion

: Technical value and selection insights for MAX1760EUB

The MAX1760EUB DC-DC boost converter stands out as an optimal solution for engineers facing tight power budgets, miniaturization pressures, and the need for low noise in portable and wireless devices. Its high efficiency across a broad load range, advanced feature set (including flexible operational modes and robust soft-start/current limit), and ultra-compact packaging make it a reference choice for battery-powered design. Adherence to application and layout best practices ensures extraction of the device’s full performance benefits, while awareness of equivalent models aids in sourcing and long-term design support. Product selection engineers and procurement professionals can leverage these technical and practical insights to ensure the right power conversion solution for contemporary compact electronics.