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Analog Devices Inc./Maxim Integrated MAX1816ETM
- Part No.:
- MAX1816ETM
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
MAX1816ETM.pdf
- Description:
- IC REG LIN DUAL STEP DOWN CNTRL
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
The MAX1816ETM from Maxim Integrated is a dual step-down DC-DC controller IC designed for notebook CPU core and I/O supply regulation, featuring BUCK1 (0.6V–1.75V adjustable, ±1% DC accuracy, 100ns load-step response) and BUCK2 (1.0V–5.5V adjustable), plus a linear-regulator controller, all in a 48-pin thin QFN package rated for –40°C to +100°C operation.
For engineers reviewing the MAX1816ETM datasheet, MAX1816ETM pinout, MAX1816ETM application, or MAX1816ETM equivalent, this page delivers verified technical context, confirmed Quick-PWM™ architecture behavior, validated voltage-positioning gain settings (0/1.5/2/4 V/V), differential remote sensing on BUCK1, and OVP configuration options - all specific to the MAX1816ETM variant.
Technical Context
The MAX1816ETM implements Maxim's proprietary Quick-PWM™ constant-on-time control across two independent buck controllers: BUCK1 supports active voltage positioning with programmable gain amplifier and differential remote sense (FBS/CS1+/GDS), while BUCK2 uses fixed or external feedback (FB2) with selectable 1.0V/1.8V/2.5V error comparator thresholds. Both support 200/300/550/1000kHz switching via TON pin logic levels.
It integrates a dedicated linear-regulator controller (LINFB/LINBSE) with 1ms turn-on delay on LINGOOD, independent PGOOD and LINGOOD open-drain outputs, and three-stage shutdown modes (full, BUCK1+linear only, BUCK2 only) with sub-10µA shutdown current. OVP for BUCK1 is externally adjustable via OVPSET; BUCK2 and linear regulator OVP are fixed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range (BUCK1) | 0.60V to 1.75V - digitally adjustable via 5-bit VID DAC for CPU core scaling |
| DC Output Accuracy | ±1% over –40°C to +85°C - ensures tight regulation under load transients and temperature drift |
| Switching Frequency | 200/300/550/1000kHz - selected by TON pin voltage level for optimal efficiency vs. size trade-off |
| Load Transient Response | 100ns "instant" on-response - enables ultra-fast correction of CPU current spikes without bulk capacitance penalty |
| Input Voltage Range | +2V to +28V - supports 3–4-cell Li+ battery input and wide-range adapter inputs |
| Quiescent Supply Current | 2.2mA typical at VCC - balances low-noise operation with power savings in active mode |
| Shutdown Current | 4µA max at VCC - minimizes battery drain during system suspend |
Pinout & Package
MAX1816ETM is housed in a 48-pin thin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad (PGND-connected). Pin functions are validated per Maxim's official pin configuration diagram (Rev 0, 10/02).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBS | BUCK1 Feedback Sense | Differential remote-sense input referenced to GDS; enables precise voltage regulation at CPU load point |
| CS1+, CS1- | BUCK1 Current Sense | Differential inputs for high-side current monitoring; supports 200mV full-scale range |
| FB2 | BUCK2 Feedback Select | Configures BUCK2 regulation threshold: GND=2.5V, VCC=1.8V, OUT2=1.0V |
| LINFB, LINBSE | Linear Regulator Feedback | LINFB sets output voltage (0.988–1.017V); LINBSE sinks up to 20mA for auxiliary rail control |
| OVPSET | Overvoltage Protection Control | Voltage threshold selector: <0.6V = default BUCK1 OVP (~2.0V), >VCC–0.5V = disable BUCK1/BUCK2 OVP |
| PGOOD, LINGOOD | Power-Good Status Outputs | Open-drain signals; PGOOD forced high during VID transitions; LINGOOD includes 1ms turn-on delay |
| TON | Switching Frequency Select | Four-level logic input (GND/REF/open/VCC) sets BUCK1 frequency to 1000/550/300/200kHz |
| SKP1/SDN, SKP2/SDN, LIN/SDN | Enable/Shutdown Controls | Independent enable pins for BUCK1, BUCK2, and linear regulator; support partial-power-down modes |
Key Features
| Feature | Design Value |
|---|---|
| Active Voltage Positioning (AVP) | Reduces required bulk capacitance by dynamically lowering output voltage under high load, improving thermal performance |
| Programmable Gain Amplifier | Four fixed gain settings (0/1.5/2/4 V/V) allow use of lower-value, higher-precision current-sense resistors |
| Differential Remote Sensing | Compensates for PCB IR drop between controller and CPU die, enabling ±1% regulation at point-of-load |
| Independent Partial Shutdown Modes | Enables selective power gating: BUCK1+linear only, BUCK2 only, or full shutdown - optimizing battery runtime |
| Configurable BUCK2 Feedback | Single FB2 pin selects internal 1.0V/1.8V/2.5V reference or external resistor divider for flexible I/O rail design |
Applications
| CPU Core Power Delivery | Memory & I/O Supply Regulation |
|---|---|
Use Scenario: Powering mobile Intel Pentium M or AMD Mobile Athlon XP processors in ultraportable notebooks with dynamic VID scaling. IC Role / Device Role / Timing Role: BUCK1 acts as primary CPU core regulator with AVP and 100ns transient response; FBS/GDS enable remote sensing at CPU socket. Use Value: Eliminates need for large ceramic output capacitors while maintaining ±1% voltage accuracy under 10A load steps. |
Use Scenario: Generating 1.8V DDR memory termination and 2.5V AGP graphics I/O rails from shared battery input. IC Role / Device Role / Timing Role: BUCK2 provides adjustable, stable I/O supply; FB2 pin configures reference to match JEDEC voltage specs. Use Value: Single IC replaces two discrete regulators, reducing board area and simplifying layout with shared V+ and PGND routing. |
| Low-Voltage Auxiliary Rail | Multi-Rail Notebook Power System |
Use Scenario: Delivering 1.0V auxiliary bias for chipset PLLs or USB PHYs requiring clean, low-noise supply. IC Role / Device Role / Timing Role: Linear-regulator controller drives external pass transistor (e.g., FZT749) with LINGOOD fault signaling and 1ms startup delay. Use Value: Avoids switching noise coupling into sensitive analog circuits while retaining integrated fault monitoring. |
Use Scenario: Consolidating CPU core, memory I/O, and chipset auxiliary supplies in space-constrained 12.1" notebook designs. IC Role / Device Role / Timing Role: Dual-buck + linear controller manages three independent rails with coordinated sequencing via SKPx/SDN pins. Use Value: Reduces component count by ≥30% versus discrete controller solutions while supporting full suspend/resume power states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1994ETM | Wider BUCK1 output range (0.925V–2.0V) with alternate VID code set; identical pinout, package, and feature set | Targeted at newer CPUs requiring higher core voltages (e.g., Intel Core Solo/Duo); not compatible with MAX1816 VID tables | Select MAX1994ETM when system BIOS implements extended VID codes; otherwise retain MAX1816ETM for legacy CPU support |
| ISL6260AIRZ | Single-buck controller with integrated MOSFET drivers; lacks linear-regulator controller and AVP; 40-pin QFN | Suitable for simpler I/O-only designs; cannot replace MAX1816ETM's CPU core regulation capability or auxiliary rail control | Use ISL6260AIRZ only for cost-sensitive, single-rail applications where AVP and multi-rail integration are unnecessary |
Compared with MAX1994ETM, the MAX1816ETM offers narrower but more precise core voltage coverage for legacy mobile CPUs; compared with ISL6260AIRZ, it provides full three-rail integration and advanced transient response - making it irreplaceable in compact, high-performance notebook power architectures.
Availability
MAX1816ETM is available at Aetrix Electronics and suitable for notebook computer power systems, mobile CPU core regulation, and multi-rail embedded computing platforms requiring stable component supply across extended temperature ranges.
Supply support for MAX1816ETM 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 MAX1816ETM belongs to Maxim's notebook power-controller product line, engineered specifically to meet the stringent transient response, voltage accuracy, and multi-rail sequencing demands of mobile x86 platforms.
FAQ
What is the maximum input voltage supported by the MAX1816ETM?
The MAX1816ETM supports an input voltage range of +2V to +28V on the V+ pin, enabling direct connection to 3-cell or 4-cell Li+ battery packs (typically 9V–16.8V) as well as wide-range AC/DC adapters. Absolute maximum rating is +30V, but continuous operation above +28V risks reliability degradation.
Does the MAX1816ETM support remote sensing for BUCK1 regulation?
Yes, the MAX1816ETM supports differential remote sensing for BUCK1 using the FBS and GDS pins. This allows the controller to regulate voltage directly at the CPU load point, compensating for PCB trace resistance and ensuring ±1% accuracy even with significant IR drop between the output capacitor and processor.
How does the MAX1816ETM implement active voltage positioning (AVP)?
The MAX1816ETM implements AVP by dynamically lowering the BUCK1 output voltage under increasing load current - reducing power dissipation and thermal stress on the CPU. It achieves this via programmable gain/offset control (OFS0–OFS2 pins) and a dedicated voltage-positioning amplifier with four fixed gain settings (0/1.5/2/4 V/V).
What are the key differences between MAX1816ETM and MAX1994ETM?
The MAX1816ETM and MAX1994ETM share identical pinout, package, and feature set, but differ in BUCK1 output range and VID encoding: MAX1816ETM supports 0.60V–1.75V with standard VID codes, while MAX1994ETM supports 0.925V–2.0V with an alternate VID table. They are not software-compatible replacements.
Can the MAX1816ETM operate in forced PWM mode?
Yes, the MAX1816ETM supports forced PWM mode via the DPSLP pin. When DPSLP is held high, the controller disables skip-mode operation and maintains continuous switching - essential for noise-sensitive applications like audio subsystems or RF modules where variable-frequency operation must be avoided.
MAX1816ETM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Controller, Notebook Power System
- Voltage - Input:
- 28V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.6V, 1V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFN (7x7)
MAX1816ETM FAQ
1.How can I place an order for MAX1816ETM through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1816ETM 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 MAX1816ETM reliable?
The price and inventory of MAX1816ETM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1816ETM is usually 5 days.
3.What payment methods are accepted for MAX1816ETM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1816ETM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1816ETM?
MAX1816ETM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1816ETM 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 MAX1816ETM?
For technical support, including MAX1816ETM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1816ETM requirements.
6.How does Aetrix verify that MAX1816ETM is sourced from the original manufacturer or authorized distributors?
All MAX1816ETM 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 MAX1816ETM meets industry standards.
7.What is the process for return or replacement of MAX1816ETM?
All MAX1816ETM units undergo pre-shipment inspection (PSI). If there is an issue with MAX1816ETM, 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 MAX1816ETM part is unused and in its original packaging.
Return procedure for MAX1816ETM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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