Analog Devices Inc./Maxim Integrated MAX14570EZT+T

Overview

The MAX14570EZT+T from Maxim Integrated is a high-efficiency, I²C-programmable voice coil motor (VCM) driver for autofocus camera modules. It delivers 0–100mA output current with 10-bit resolution (97.7µA/LSB), supports selectable PWM or linear output modes, and integrates slew-rate control and spread-spectrum oscillation to reduce EMI in space-constrained mobile imaging systems.

For engineers reviewing the MAX14570EZT+T datasheet, MAX14570EZT+T pinout, MAX14570EZT+T application, or MAX14570EZT+T equivalent, key selection criteria include VCM current accuracy (±2% FSR gain error), thermal shutdown at +150°C, 6µA shutdown current, 0.78mm × 1.35mm WLP package, and I²C-adjustable ringing compensation for actuator settling time optimization.

Technical Context

The MAX14570EZT+T implements an integrated H-bridge with programmable 10-bit DAC control via I²C, enabling precise DC current regulation across ISOURCE and ISINK terminals. Its dual-mode operation-PWM (1.2–5.8MHz selectable frequency) or linear-allows trade-offs between efficiency (~80% at 60mA, VDD = 2.8V) and noise performance.

EMI mitigation is achieved through two independent features: user-configurable slew-rate limiting (SR[2:0] + SRL bits) and spread-spectrum clocking (SS bit, ±20% bandwidth). Ringing compensation uses a digitally reconstructed lowpass filter (tunable cutoff via FSHP/FSHPD registers) to match VCM mechanical resonance and reduce shutter lag.

Key Specifications

Pinout & Package

The MAX14570EZT+T is housed in a 0.78mm × 1.35mm × 0.35mm, 6-bump wafer-level package (WLP) with 0.4mm pitch. Bump-side-down top view places all six terminals on a 2×3 grid.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV2605LRTVT and DRV2667YZFT, the MAX14570EZT+T provides superior autofocus precision (10-bit vs. 8-bit), configurable EMI suppression (spread-spectrum + slew-rate), and dedicated ringing compensation-making it optimal for high-performance mobile imaging where settling time and spectral cleanliness are critical.

Availability

The MAX14570EZT+T is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and ultrathin wearable optics requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX14570EZT+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, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and consumer applications.

The MAX14570EZT+T belongs to Maxim's camera interface and autofocus driver product line, engineered specifically for low-power, high-accuracy VCM control in space- and noise-constrained mobile imaging systems.

FAQ

What is the maximum output current capability of the MAX14570EZT+T?

The MAX14570EZT+T delivers a programmable output current range of 0 to 100mA with 10-bit resolution (97.7µA/LSB). This full-scale capability is specified across the operating temperature range (-40°C to +85°C) and supply voltage range (2.3V to 5.5V), supporting high-force VCM actuators used in premium smartphone cameras. The device maintains ±2% full-scale range (FSR) gain error and ±0.75% FSR offset error under these conditions.

Does the MAX14570EZT+T support both PWM and linear output modes?

Yes, the MAX14570EZT+T supports both PWM and linear output modes, selected via the PWM_LIN bit (bit 1) in register 0x06. In PWM mode, ISOURCE switches at programmable frequencies (1.2–5.8MHz) to regulate average current; in linear mode, it provides continuous current sourcing. Mode selection is fully software-controlled over I²C, enabling dynamic adaptation to noise or efficiency requirements without hardware changes.

How does the MAX14570EZT+T reduce electromagnetic interference (EMI)?

The MAX14570EZT+T reduces EMI through two independent, I²C-configurable features: spread-spectrum clocking (SS bit in register 0x06), which dithers the PWM frequency by ±20% to lower peak spectral energy, and slew-rate limiting (SRL + SR[2:0] bits in register 0x08), which controls edge rates to reduce high-frequency harmonics. Both features are validated in the datasheet's FFT plots (Figures 13–14) and ripple current measurements.

What diagnostic capabilities does the MAX14570EZT+T provide for VCM health monitoring?

The MAX14570EZT+T provides real-time VCM diagnostics via its Status register (0x05). When DIAG = 1, it reports OPEN (open-circuit), SHORT (short-to-rail or ISOURCE–ISINK short), and PROT (overcurrent) conditions. Diagnostics use a 6mA test current and complete within 1ms. These flags enable predictive maintenance and fault recovery in camera modules without requiring external sense circuitry.

What package type and dimensions does the MAX14570EZT+T use?

The MAX14570EZT+T uses a 0.78mm × 1.35mm × 0.35mm, 6-bump wafer-level package (WLP) with 0.4mm pitch. This ultra-compact package is designed for direct chip-on-flex or chip-on-board integration in thin camera modules. The bump map is defined as A1=SDA, A2=ISINK, A3=GND, B1=SCL, B2=ISOURCE, B3=VDD-matching the mechanical layout shown in the datasheet's Figure 8.