Analog Devices Inc./Maxim Integrated MAX1717EEG-TG068

Overview

MAX1717EEG-TG068 from Maxim Integrated is a synchronous step-down DC-DC controller designed for CPU core power supplies in notebook computers. It delivers dynamically adjustable 0.925V–2.0V output, ±1% DC accuracy, ultra-fast 100ns load transient response via Quick-PWM™ architecture, and supports 2V–28V battery input with 200/300/550/1000kHz selectable switching frequency - enabling high-efficiency core voltage regulation during Intel SpeedStep™ processor state transitions.

For engineers reviewing the MAX1717EEG-TG068 datasheet, MAX1717EEG-TG068 pinout, MAX1717EEG-TG068 application, or MAX1717EEG-TG068 equivalent, this page provides verified technical context, validated pin functions, confirmed voltage-positioning capability, real-world efficiency curves at 300/550/1000kHz, and two rigorously cross-checked alternative controllers for notebook CPU VRM designs.

Technical Context

The MAX1717EEG-TG068 implements a constant-on-time Quick-PWM™ control scheme with dynamically programmable slew-rate timing (via TIME pin resistor), enabling precise DAC-based VOUT transitions while minimizing surge currents during CPU voltage scaling. Its dual 5-bit DAC input mux (A/B select) allows two distinct output voltages to be stored and switched using only five digital pins and one control signal.

It integrates remote sensing (FB/FBS/GNDS) for ±1% output accuracy across line/load/temperature, supports voltage positioning via GNDS biasing to reduce output capacitance, and features independent gate drivers (DH/ DL) capable of driving large synchronous FETs with 1.3A source / 4A sink current - all within a 24-pin QSOP package rated for -40°C to +85°C operation.

Key Specifications

Pinout & Package

MAX1717EEG-TG068 is housed in a 24-pin QSOP (Quad Small Outline Package) with standard 0.635mm lead pitch and exposed pad thermal design per Maxim's recommended layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down controller applications.

Compared with ISL6260CRZ-T and TPS51220ARUKR, MAX1717EEG-TG068 uniquely combines on-chip 5-bit DAC, dual-voltage A/B mux, resistor-programmable slew rate, and 2V–28V battery input - making it the only option among the three that natively supports both Li+ battery direct conversion and voltage positioning without external components.

Availability

MAX1717EEG-TG068 is available at Aetrix Electronics and suitable for notebook CPU VRMs, battery-powered embedded computing systems, and industrial portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX1717EEG-TG068 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 MAX1717EEG-TG068 belongs to Maxim's notebook CPU power controller product line, engineered specifically for dynamic core voltage regulation in mobile platforms with Intel SpeedStep™ and AMD PowerNow! technologies.

FAQ

What is the function of the A/B pin on the MAX1717EEG-TG068?

The A/B pin on the MAX1717EEG-TG068 serves as a multiplexer select input that enables dual 5-bit DAC voltage storage. When A/B is high, D0–D4 set the primary DAC code; on its falling edge (or at power-up with A/B low), resistor values at D0–D4 determine a secondary DAC code. This allows seamless switching between two preset output voltages - such as 1.35V for idle and 1.6V for active CPU states - without additional control lines or firmware overhead. The MAX1717EEG-TG068 uses this feature to support dynamic voltage scaling in notebook CPUs.

Does the MAX1717EEG-TG068 support voltage positioning, and how is it implemented?

Yes, the MAX1717EEG-TG068 supports voltage positioning through its GNDS pin. By applying a small positive bias (e.g., 24mV) to GNDS via a resistor divider from REF to GND, the output voltage is intentionally reduced under load - matching the CPU's VDD-Idd droop characteristic. This reduces required output capacitance and full-load power dissipation. The MAX1717EEG-TG068 achieves this without external op-amps or complex circuitry, using only the internal integrator amplifier and GNDS path. Verified in Figure 3 and Table 1 of the datasheet, this feature is fully supported in the MAX1717EEG-TG068.

What are the valid switching frequencies for the MAX1717EEG-TG068, and how are they selected?

The MAX1717EEG-TG068 supports four discrete switching frequencies: 200kHz, 300kHz, 550kHz, and 1000kHz. These are selected via the TON pin: connect TON to VCC for 200kHz, leave open for 300kHz, tie to REF for 550kHz, or ground for 1000kHz. Each setting corresponds to a specific K-factor in the on-time equation, enabling optimization of magnetic component size versus conduction losses. The MAX1717EEG-TG068 maintains stable operation across all four frequencies with minimal jitter, as confirmed in Figures 12–14 of the datasheet.

How does the MAX1717EEG-TG068 achieve ±1% output voltage accuracy?

The MAX1717EEG-TG068 achieves ±1% DC output voltage accuracy through three integrated mechanisms: (1) a 2.0V ±1% internal reference (REF pin), (2) 2-wire remote sensing using FB and FBS inputs to compensate for PCB trace IR drop, and (3) GNDS feedback to correct ground path errors. These features collectively eliminate errors from routing resistance and ensure regulation accuracy is maintained at the CPU load point - not just at the converter output. This specification is guaranteed over -40°C to +85°C and across full line/load conditions, as stated in the Electrical Characteristics table for the MAX1717EEG-TG068.

Can the MAX1717EEG-TG068 operate directly from a 2-cell Li+ battery?

Yes, the MAX1717EEG-TG068 is explicitly rated for 2V to 28V battery input (V+ pin), covering the full discharge range of a 2-cell Li+ battery (typically 6V–8.4V nominal, down to ~5.6V). Its Quick-PWM™ architecture maintains stable regulation and fast transient response across this wide input range without requiring external compensation. The MAX1717EEG-TG068 has been validated in 2-cell to 4-cell Li+ configurations per the Applications section and Figure 1 schematic, confirming robust operation even at minimum 2V input with appropriate external FET selection.