Analog Devices Inc./Maxim Integrated MAX1917EEE+

Overview

The MAX1917EEE+ from Maxim Integrated is a synchronous buck controller optimized for DDR memory power management, integrating VTT and VTTR termination supplies with 1/2VDDR tracking. It delivers ±25A sourcing/sinking capability, maintains VTT/VTTR within ±1% of 1/2VDDR, operates up to 1MHz switching frequency, and achieves up to 96% efficiency using Quick-PWM™ architecture-enabling compact, high-efficiency DDR termination in notebook and server platforms.

For engineers reviewing the MAX1917EEE+ datasheet, MAX1917EEE+ pinout, MAX1917EEE+ application, or MAX1917EEE+ equivalent, key selection criteria include its dual-sourcing/sinking capability for DDR termination, resistor-programmable current limit, VL-regulated 5V internal supply, 16-pin QSOP package with Kelvin-sense layout requirements, and absence of external current-sense resistors.

Technical Context

The MAX1917EEE+ implements Maxim's proprietary Quick-PWM™ control architecture, enabling sub-1µs on-time adjustment and fast transient response without fixed-frequency clock dependency. Its valley-current sensing uses the low-side MOSFET's R_DS(ON) for lossless overcurrent protection, with programmable positive/negative current limits (±85–230mV) via ILIM resistor.

It integrates a 5V VL linear regulator (4.8–5.2V output, 35mA RMS), dual tracking outputs (VTT and VTTR referenced to DDR input), and a dual-function EN/HSD pin that serves as both enable input and high-side drain voltage monitor for adaptive on-time calculation-eliminating need for external V_IN sensing.

Key Specifications

Pinout & Package

MAX1917EEE+ is housed in a 16-pin QSOP (Quad Small Outline Package) with 0.635mm pitch, surface-mount footprint, and exposed thermal pad (not electrically connected). The package supports reflow soldering per JEDEC J-STD-020 and provides adequate thermal dissipation for continuous 25A operation with proper PCB copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Compared with ISL6522CRZ-T and TPS51116PWR, the MAX1917EEE+ uniquely integrates both VTT and VTTR tracking outputs with resistor-programmable current limit and Quick-PWM™ architecture-making it the only solution supporting full DDR2/DDR3 termination with single-chip bidirectional current handling and no external sense resistors.

Availability

MAX1917EEE+ is available at Aetrix Electronics and suitable for DDR memory termination, notebook CPU core supplies, and industrial AGTL bus termination requiring stable component supply, long-term lifecycle support, and JEDEC-compliant voltage accuracy.

Supply support for MAX1917EEE+ 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 ICs for computing, communications, and industrial applications.

The MAX1917EEE+ belongs to Maxim's DDR power-management controller product line, designed specifically to replace multi-chip termination solutions with a single IC capable of bidirectional current delivery, precision tracking, and lossless current sensing for DDR2/DDR3 memory interfaces.

FAQ

What is the maximum supported DDR input voltage range for the MAX1917EEE+?

The MAX1917EEE+ supports a DDR input voltage range of 0V to 3.6V, as specified in the Electrical Characteristics table. This range covers standard DDR2 (1.8V), DDR3 (1.5V), and low-voltage DDR3 (1.35V) VDDR references, enabling the IC to generate corresponding VTT and VTTR outputs at exactly 1/2 × VDDR with ±1% accuracy across the full range.

Does the MAX1917EEE+ require an external current-sense resistor for overcurrent protection?

No, the MAX1917EEE+ does not require an external current-sense resistor. It implements valley-current sensing using the R_DS(ON) of the low-side MOSFET as the current-sensing element. The current-limit threshold is programmable via the ILIM pin using an external resistor, and the IC includes both positive (sourcing) and negative (sinking) current limits to protect against reverse inductor current during DDR bus turnaround events.

How is the switching frequency configured on the MAX1917EEE+?

The MAX1917EEE+ switching frequency is configured using the FSEL pin: connecting FSEL to GND selects 550kHz, to REF selects 400kHz, leaving it floating selects 300kHz, and tying it to VL selects 200kHz. These presets avoid noise-sensitive bands like 455kHz IF, and the architecture allows variable frequency operation up to 1MHz depending on load and input conditions-enabling optimization for efficiency, size, or EMI performance.

What is the role of the EN/HSD pin on the MAX1917EEE+?

The EN/HSD pin on the MAX1917EEE+ serves two roles: when pulled to GND, it places the IC in ultra-low-power shutdown mode (<5µA). When connected to the drain of the high-side MOSFET, it acts as a V_IN monitor for adaptive on-time calculation-enabling the Quick-PWM™ architecture to maintain nearly constant frequency without a fixed oscillator, while eliminating need for external V_IN sensing components.

Can the MAX1917EEE+ be used for non-DDR applications such as general-purpose step-down conversion?

Yes, the MAX1917EEE+ can be used as a general-purpose synchronous buck controller. Its datasheet explicitly states it supports variable switching frequency up to 1MHz and operates with input voltages from 4.5V to 14V (or 28V with resistor divider). With appropriate external components and feedback configuration, it delivers high-efficiency step-down conversion for non-DDR rails-though its VTT/VTTR tracking features remain inactive unless DDR reference is applied.