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Analog Devices Inc./Maxim Integrated MAX1711EEG-T
- Part No.:
- MAX1711EEG-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1711EEG-T.pdf
- Description:
- ADJUSTED STEP-DOWN CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:574
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Product details
Overview
MAX1711EEG-T from Maxim Integrated is a high-speed, digitally adjusted step-down DC-DC controller IC designed for CPU core power supplies in notebook computers. It delivers ±1% VOUT accuracy over line and load, 100ns load-step response via Quick-PWM™ architecture, and supports 0.925V–2.0V output adjustment via 5-bit DAC - all in a 24-pin QSOP package rated for –40°C to +85°C operation.
For engineers reviewing the MAX1711EEG-T datasheet, MAX1711EEG-T pinout, MAX1711EEG-T application, or MAX1711EEG-T equivalent, this controller is selected for high-efficiency, low-voltage (sub-2V), high-current (up to 7A) CPU core regulation where dynamic voltage scaling, remote sensing, and fast transient immunity are critical design requirements.
Technical Context
The MAX1711EEG-T implements Maxim's proprietary Quick-PWM™ constant-on-time control with input voltage feed-forward, enabling stable switching frequency across wide input (2V–28V battery) and output (0.925V–2.0V) ranges while achieving 100ns response to 0A→7A load steps. Its dual-sense architecture uses FB (local) and FBS (remote) inputs to compensate for both supply rail and ground bus IR drops.
It integrates a 5-bit DAC for digital VOUT programming, fixed 2.25V overvoltage and 0.8V undervoltage protection thresholds, and gate drivers capable of driving large synchronous-rectifier MOSFETs (DH: 5Ω on-resistance; DL: 0.5Ω pulldown). The controller operates with external +5V bias (VCC/VDD) and requires no current-sense resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.925V to 2.0V - digitally set via 5-bit DAC inputs (D0–D4), compliant with Mobile Pentium II® CPU core voltage requirements. |
| DC Output Accuracy | ±1% over line/load/temperature - achieved via 2-wire remote sensing (FB + FBS) and precision 2.0V internal reference. |
| Load-Step Response | 100ns - enables stable regulation during CPU clock throttling events (e.g., 0A → 7A transients). |
| Input Voltage Range | 2V to 28V on V+ - supports direct battery-to-core (single-stage) conversion from Li-ion or multi-cell packs. |
| Switching Frequency | 200/300/400/550kHz - selectable via TON pin strapping; maintains near-constant frequency despite wide VIN/VOUT ratios. |
| Protection Features | Fixed OVP = 2.25V, UVP = 0.8V - provides deterministic fault thresholds independent of DAC code changes. |
| Package | 24-pin QSOP - surface-mount, RoHS-compliant, 3.9mm × 8.7mm footprint suitable for space-constrained notebook PCB layouts. |
Pinout & Package
MAX1711EEG-T is housed in a 24-pin QSOP (Quad Small Outline Package) with standard 0.635mm lead pitch and exposed pad not present. Pin functions are validated per Maxim's MAX1711 datasheet Rev 1 (7/2000), Figure 1 and Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Battery voltage sense input | Feeds input feed-forward path; sets DH on-time inversely proportional to VIN (2V–28V range); no current injection required. |
| FB | Fast feedback input | Connected to local output capacitor node; provides primary error signal for PWM comparator; supports external resistor-divider override. |
| FBS | Remote sense input | Connected directly at CPU VCORE pins; compensates for supply rail IR drop; disables integrators when tied to VCC. |
| GNDS | Remote ground sense input | Connected directly at CPU ground plane; compensates for ground bus IR drop; enables true Kelvin sensing of load voltage. |
| D0–D4 | DAC code inputs (LSB to MSB) | 5-bit parallel interface; internal 5µA pull-ups to VCC; sets VOUT across 0.925V–2.0V range in 25mV steps (per datasheet Table 2). |
| DH / DL | High-side / low-side gate drivers | DH swings LX-to-BST (capable of driving >10nC FETs); DL sinks 3A / sources 1A with 0.5Ω pulldown resistance for robust synchronous rectification. |
| PGOOD | Open-drain power-good indicator | Asserts after soft-start completes and VOUT reaches ±12.5% of target; 1.5µs propagation delay; supports system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-PWM™ control | Enables 100ns load-step response without sacrificing switching frequency stability-critical for CPU dynamic voltage scaling. |
| No current-sense resistor | Eliminates I2R loss and layout sensitivity; uses output capacitor ESR as inherent current-sense element for lossless current limiting. |
| 5-bit digital VOUT programming | Supports 32 discrete output voltages from 0.925V to 2.0V (25mV resolution), enabling precise compliance with mobile CPU VID tables. |
| 2-wire remote sensing (FB + FBS) | Compensates for up to 25mV total IR drop across power and ground paths-ensures accurate voltage delivery at CPU die. |
| Fixed OVP/UVP thresholds | 2.25V OVP and 0.8V UVP remain invariant during DAC code changes-prevents false trips during dynamic voltage transitions. |
| 1.7ms digital soft-start | Linear VOUT ramp prevents inrush current and ensures controlled startup into large ceramic output capacitors (e.g., 4×47µF). |
Applications
| Mobile Notebook CPU Core Supply | Industrial Embedded CPU Power |
|---|---|
Use Scenario: Regulating sub-2V, high-current (up to 7A) power for Intel Mobile Pentium II® and compatible CPUs in clamshell notebooks. IC Role / Device Role / Timing Role: Primary step-down controller managing DH/DL gate timing, current limiting, and remote-sense feedback loop. Use Value: Delivers ±1% VOUT accuracy and 100ns transient response-meeting strict CPU VID tolerance and dynamic load requirements. |
Use Scenario: Providing tightly regulated core voltage to ARM-based SoCs in ruggedized industrial tablets operating from wide-input DC sources (12–24V). IC Role / Device Role / Timing Role: High-efficiency buck controller with programmable output and remote sensing for long-life embedded systems. Use Value: Enables single-stage conversion from 24V battery/bus to 1.1V–1.8V SoC rails with minimal BOM count and no current-sense resistor. |
| Docking Station Auxiliary CPU Rail | Low-Noise Two-Stage Notebook Converter |
Use Scenario: Generating secondary VCORE rail in docking stations supporting hot-plug CPU upgrades or dual-CPU configurations. IC Role / Device Role / Timing Role: Digitally adjustable controller synchronized to host system VID commands via D0–D4 interface. Use Value: 5-bit DAC allows real-time voltage updates without firmware reconfiguration-supporting multiple CPU SKUs from one hardware design. |
Use Scenario: Stepping down +5V system supply (not battery) to 1.6V CPU core in ultra-thin notebooks where size minimization is prioritized. IC Role / Device Role / Timing Role: High-frequency (550kHz) buck controller enabling smaller inductors (e.g., 0.7µH) and reduced output capacitance. Use Value: Achieves >90% efficiency at 7A with 550kHz operation-reducing solution footprint by ~30% vs. 300kHz designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1710EEG-T | 4-bit DAC (16 codes), variable OVP/UVP thresholds tracking VOUT, no D4 pin | Suitable for fixed-VOUT designs or where DAC code changes are infrequent; lacks fine-grained voltage resolution of MAX1711EEG-T | Select MAX1710EEG-T only if 25mV DAC steps and fixed OVP are unnecessary-reduces pin count and software complexity. |
| RT8205AZSP | Integrated high-/low-side MOSFETs, 3A max output, no remote sensing, 0.6V–3.3V VOUT range | Targeted at cost-sensitive, lower-current (<3A) applications; lacks FBS/GNDS inputs and 7A capability | Choose RT8205AZSP for compact, integrated solutions below 3A; MAX1711EEG-T remains preferred for >5A, remote-sense, and notebook-grade accuracy. |
Compared with MAX1710EEG-T, the MAX1711EEG-T adds 5-bit DAC resolution and fixed protection thresholds-enabling dynamic voltage scaling without recalibrating fault limits. Versus RT8205AZSP, it trades integration for higher current, precision sensing, and design flexibility in demanding CPU power applications.
Availability
MAX1711EEG-T is available at Aetrix Electronics and suitable for notebook computer power supplies, docking station auxiliary rails, and industrial embedded CPU core regulation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for MAX1711EEG-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 ICs for computing, communications, and industrial markets.
The MAX1710/MAX1711/MAX1712 product line was engineered specifically for high-efficiency, digitally programmable CPU core DC-DC conversion in portable computing-prioritizing transient response, remote sensing accuracy, and flexible input/output voltage handling.
FAQ
What is the function of the FBS and GNDS pins on the MAX1711EEG-T?
The FBS (Feedback Remote-Sense) and GNDS (Ground Remote-Sense) pins enable true Kelvin sensing for the MAX1711EEG-T. FBS connects directly to the CPU VCORE pin to compensate for supply rail IR drop, while GNDS connects to the CPU ground plane to correct for ground bus voltage offset. Together, they ensure the regulated output voltage at the load matches the DAC-set value within ±1%, even with up to 25mV total path resistance.
Does the MAX1711EEG-T require an external current-sense resistor?
No, the MAX1711EEG-T does not require an external current-sense resistor. It uses the ESR of the output ceramic capacitor as a lossless current-sense element, eliminating I2R losses and associated layout sensitivity. Current limiting is implemented via the ILIM pin, which sets the LX-to-PGND threshold voltage (e.g., 100mV fixed or adjustable via external resistor), and is validated in the MAX1711EEG-T datasheet Electrical Characteristics table.
How does the MAX1711EEG-T achieve 100ns load-step response?
The MAX1711EEG-T achieves 100ns load-step response through its proprietary Quick-PWM™ architecture-a constant-on-time control scheme with input voltage feed-forward. Unlike traditional current-mode PWMs, it avoids latency from current-loop amplifiers and instead uses the output ripple voltage (via capacitor ESR) as the PWM ramp signal. This enables near-instantaneous DH on-time adjustment in response to load transients, as confirmed in Figure MAX1710-16 through MAX1710-20 of the MAX1711EEG-T datasheet.
What are the key differences between MAX1711EEG-T and MAX1710EEG-T?
The MAX1711EEG-T features a 5-bit DAC (32 output codes, 0.925V–2.0V range) versus the MAX1710EEG-T's 4-bit DAC (16 codes, 1.25V–2.0V range). It also includes a dedicated D4 pin and fixed overvoltage (2.25V) and undervoltage (0.8V) protection thresholds-whereas MAX1710EEG-T thresholds track VOUT. These differences make MAX1711EEG-T better suited for dynamic voltage scaling applications requiring fine-grained, stable fault limits.
Can the MAX1711EEG-T operate from a 5V-only input without a battery connection?
Yes, the MAX1711EEG-T can operate from a 5V-only input. Its V+ pin accepts 2V–28V, so tying V+ to the +5V bias supply (VCC/VDD) is valid. However, the +5V bias must power both VCC (PWM core) and VDD (DL driver), and SHDN must be asserted only after V+ is stable. Startup sequencing must ensure V+ is present before releasing SHDN-verified in the MAX1711EEG-T datasheet "+5V Bias Supply" section and Figure 1 application circuit.
MAX1711EEG-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Controller, Notebook Power System
- Voltage - Input:
- 2V ~ 5.5V, 4.5V ~ 28V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.925V ~ 2V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
MAX1711EEG-T FAQ
1.How can I place an order for MAX1711EEG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1711EEG-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX1711EEG-T reliable?
The price and inventory of MAX1711EEG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1711EEG-T is usually 5 days.
3.What payment methods are accepted for MAX1711EEG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1711EEG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1711EEG-T?
MAX1711EEG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1711EEG-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX1711EEG-T?
For technical support, including MAX1711EEG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1711EEG-T requirements.
6.How does Aetrix verify that MAX1711EEG-T is sourced from the original manufacturer or authorized distributors?
All MAX1711EEG-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX1711EEG-T meets industry standards.
7.What is the process for return or replacement of MAX1711EEG-T?
All MAX1711EEG-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1711EEG-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX1711EEG-T part is unused and in its original packaging.
Return procedure for MAX1711EEG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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