Analog Devices Inc./Maxim Integrated MAX8660BETL+T

Overview

MAX8660BETL+T from Maxim Integrated is a high-efficiency, low-quiescent-current power management IC (PMIC) designed for mobile application processors in smart cellular phones and portable devices. It integrates four synchronous step-down DC-DC converters (REG1–REG4), four LDO regulators (REG5–REG8), and dynamic voltage management via I²C. Key confirmed specs: 2MHz PWM switching, 20µA deep-sleep current, 7.5V input protection, and 40-pin 5mm × 5mm Thin QFN package.

For engineers reviewing the MAX8660BETL+T datasheet, MAX8660BETL+T pinout, MAX8660BETL+T application, or MAX8660BETL+T equivalent, this page delivers verified circuit role (multi-rail processor power supply), exact output configurations (V1=3.3V/3.0V/2.85V @1.2A; V3/V4 I²C-programmable 0.725–1.8V), thermal shutdown at +160°C, and validated alternatives for Marvell PXA3xx-based designs.

Technical Context

The MAX8660BETL+T implements dynamic voltage management (DVM) for processor core (V3) and SRAM (V4) rails via I²C registers, enabling real-time voltage scaling during performance state transitions. Its four DC-DC converters use synchronous rectification with p/n-channel MOSFETs (RP3=0.12Ω, RN3=0.08Ω) and support forced-PWM mode for noise-sensitive operation.

Power sequencing is controlled by dedicated enable signals (EN1–EN5, EN34) and internal ramp-rate control (RAMP pin), with soft-start times of 400µs for V3/V4 and 290µs for V5. Undervoltage lockout (2.20–2.55V) and overvoltage lockout (6.00–6.30V) protect against input rail faults while maintaining operation across -40°C to +85°C.

Key Specifications

Pinout & Package

MAX8660BETL+T uses a 40-pin Thin QFN package (5mm × 5mm × 0.8mm) with exposed thermal pad. Pin functions are validated per Maxim's official pin configuration diagram and electrical characteristics table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PMIC applications.

Compared with MAX8660ETL+ and MAX8661ETL+, the MAX8660BETL+T provides a balanced feature set-retaining V1/V2 pin-programmability and V3/V4 DVM while omitting redundant REG1/REG7, making it optimal for mid-tier Marvell PXA3xx implementations where cost and footprint are constrained but full dynamic scaling is required.

Availability

MAX8660BETL+T is available at Aetrix Electronics and suitable for smartphone application processor power, Marvell PXA3xx-based PDA designs, and portable GPS navigation units requiring stable component supply and long-term lifecycle support.

Supply support for MAX8660BETL+T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, communications, and consumer markets.

The MAX8660 family was engineered specifically for dynamic power delivery to Marvell PXA3xx application processors, integrating tightly coupled voltage rails, hardware sequencing, and I²C-configurable DVM to meet stringent mobile battery life and thermal requirements.

FAQ

What is the primary function of the MAX8660BETL+T in a mobile device?

The MAX8660BETL+T serves as a complete power management IC for application processors, integrating four step-down DC-DC converters, four LDOs, dynamic voltage management, and hardware sequencing. In a typical implementation, the MAX8660BETL+T powers the CPU core (V3), memory interface (V2), I/O subsystem (V1), and always-on functions (V8), enabling efficient energy use across operational modes.

How does the MAX8660BETL+T support dynamic voltage scaling for processor cores?

The MAX8660BETL+T supports dynamic voltage scaling through its I²C-programmable V3 (VCC_APPS) and V4 (VCC_SRAM) outputs, which can be adjusted from 0.725V to 1.8V in real time. The MAX8660BETL+T implements dedicated ramp-rate control (via RAMP pin) and sequenced enable logic to ensure glitch-free transitions during performance state changes in Marvell PXA3xx processors.

What are the key differences between MAX8660BETL+T and MAX8660ETL+?

The MAX8660BETL+T omits the REG1 step-down converter and REG7 LDO present in the MAX8660ETL+, reducing component count and cost for designs that do not require those specific rails. Both share identical 40-pin Thin QFN packaging, I²C register compatibility, and V1/V2 pin-programmable logic, making the MAX8660BETL+T a targeted variant for optimized PXA3xx implementations.

Does the MAX8660BETL+T include built-in battery monitoring features?

Yes, the MAX8660BETL+T integrates a precision low-battery detector with three dedicated pins: LBO (open-drain flag), LBF (falling threshold at 1.20V), and LBR (rising threshold at 1.25V). This allows the MAX8660BETL+T to autonomously monitor battery voltage and assert LBO when cell voltage drops below safe operating levels-eliminating the need for external comparators in portable designs.

What thermal protection mechanisms are implemented in the MAX8660BETL+T?

The MAX8660BETL+T incorporates thermal-overload protection that triggers shutdown at +160°C junction temperature, with 15°C hysteresis to prevent oscillation near the trip point. This safeguard is critical for handheld devices where airflow is limited; the MAX8660BETL+T's exposed thermal pad and 5mm × 5mm QFN package facilitate efficient heat dissipation into the PCB ground plane.