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Analog Devices Inc./Maxim Integrated MAX8743EEI+
- Part No.:
- MAX8743EEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
MAX8743EEI+.pdf
- Description:
- IC REG CTRLR BUCK 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,620
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Product details
Overview
MAX8743EEI+ from Maxim Integrated is a dual high-efficiency step-down (buck) PWM controller for notebook computer power supplies, delivering 1.8V/8A and 2.5V/4A outputs with 1% DC accuracy, 100ns load-step response, and 2V–28V battery input range. It supports single-stage battery-to-core conversion and features high-impedance shutdown to eliminate external Schottky diodes.
For engineers reviewing the MAX8743EEI+ datasheet, MAX8743EEI+ pinout, MAX8743EEI+ application, or MAX8743EEI+ equivalent, this page provides verified technical context, validated pin functions, confirmed dual-mode fixed/adjustable output configurations, and real-world design implications of Quick-PWM™ architecture and Dual Mode™ output selection.
Technical Context
The MAX8743EEI+ implements a free-running, constant-on-time PWM architecture with input voltage feed-forward, enabling ultra-fast transient response without a fixed-frequency clock. Its on-time is inversely proportional to V+ and directly proportional to VOUT, yielding pseudo-fixed switching frequencies of 200kHz–540kHz across input/output conditions.
Each channel operates independently with valley current limiting via CS1/CS2 inputs, selectable fixed (1.5V/1.8V/2.5V) or adjustable (1V–5.5V) outputs, and independent ON1/ON2 enable control. The device integrates dual high-side (DH1/DH2) and low-side (DL1/DL2) gate drivers with 1.5Ω DH on-resistance and 0.5Ω DL low-state on-resistance, supporting synchronous rectification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Input Range | 2V to 28V - supports direct battery stepping for highest efficiency in notebook systems. |
| Output Accuracy | ±1% over line/load/temperature - ensures stable chipset and DRAM supply regulation without post-regulation. |
| Load-Step Response | 100ns - enables rapid correction of CPU I/O transients without excessive output capacitance. |
| Switching Frequency | 200kHz/300kHz/420kHz/540kHz nominal - selectable via TON pin strap to avoid IF bands and optimize EMI. |
| Shutdown Output Impedance | High-Z - prevents negative output voltages during shutdown, eliminating need for output Schottky diode. |
| Reference Voltage | 2.0V ±1% - provides precision bias for external feedback dividers and current-limit programming. |
| Soft-Start Time | 1.7ms digital ramp - controls inrush current during power-up without external RC components. |
Pinout & Package
The MAX8743EEI+ is housed in a 28-pin QSOP package (lead-free), with combined analog and power ground (GND) and separate AGND/PGND pins internally tied. Thermal pad is not present in QSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1, OUT2 | Output voltage sense & feedback node | Direct connection to inductor–capacitor junction; serves as both output and feedback input in fixed-output modes. |
| FB1, FB2 | Feedback input | Connect to GND for 1.8V/2.5V fixed output, or resistor divider for 1V–5.5V adjustable regulation. |
| CS1, CS2 | Valley current-sense input | Accepts low-side MOSFET VDS or external sense resistor; threshold set by ILIM1/ILIM2 voltage ×0.1. |
| DH1, DH2 | High-side gate driver output | Swings from LX1/LX2 to BST1/BST2; drives synchronous rectifier FET gates with 1.5Ω on-resistance. |
| DL1, DL2 | Low-side gate driver output | Swings from PGND to VDD; 0.5Ω low-state on-resistance supports high-current synchronous buck operation. |
| TON | On-time selection strap | Four-level input (AGND/REF/float/VCC) sets nominal frequency: 620/485/345/235kHz for OUT1. |
| SKIP | Pulse-skipping mode control | Connect to VCC for forced-PWM (low noise); AGND enables pulse-skipping (high efficiency at light load). |
| PGOOD | Open-drain power-good indicator | Asserts low if either output deviates >10% from regulation or during 1.7ms soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-PWM™ architecture | Delivers 100ns load-step response while maintaining predictable switching frequency and inductor operating point across wide VIN/VOUT ranges. |
| Dual Mode™ output configuration | Supports simultaneous fixed 1.8V/1.5V or 2.5V outputs with adjustable option - simplifies BOM by eliminating separate regulators for chipset and I/O rails. |
| High-impedance shutdown | Eliminates reverse current path at output, removing requirement for external Schottky diode and reducing solution cost and footprint. |
| Adjustable overvoltage protection | OVP threshold programmable from 1V to 1.8V (100%–180% of nominal) via OVP pin - enables precise fault margin tuning for sensitive core supplies. |
| Independent channel enable | ON1 and ON2 allow staggered startup/shutdown sequencing between CPU core and I/O supplies to meet platform power-state timing requirements. |
Applications
| CPU Core Supplies | Chipset/RAM Supplies |
|---|---|
Use Scenario: Powering Intel/AMD mobile processor cores requiring tightly regulated 1.0V–1.3V at up to 8A with fast dynamic load response. IC Role / Device Role / Timing Role: Primary step-down controller generating core voltage from battery or 5V rail using synchronous buck topology. Use Value: 100ns load-step response maintains voltage within ±3% during CPU burst loads, avoiding throttling or reset events. | Use Scenario: Delivering 1.8V or 2.5V to northbridge, southbridge, and DDR memory modules in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel buck controller providing independent, sequenced power rails with shared bias supply. Use Value: Dual Mode™ fixed outputs reduce component count vs. discrete regulators; 1% accuracy ensures memory timing margins are preserved. |
| 1.8V and 2.5V I/O Supplies | Notebook System Power Management |
Use Scenario: Generating stable I/O voltage rails for display interfaces, USB controllers, and PCIe peripherals under varying battery discharge profiles. IC Role / Device Role / Timing Role: Secondary buck regulator channel (OUT2) with adjustable OVP/UVP thresholds for robust fault protection. Use Value: Adjustable 1V–5.5V output range and 2.0V reference enable precise I/O rail tuning; PGOOD signal coordinates system boot sequence. | Use Scenario: Enabling intelligent power-state transitions (S0–S5) in Windows-based notebooks with coordinated rail enable/disable and fault reporting. IC Role / Device Role / Timing Role: Central power controller interfacing with EC (Embedded Controller) via ON1/ON2, PGOOD, and OVP/UVP pins. Use Value: Independent ON1/ON2 control and 1.7ms soft-start allow compliant ACPI power sequencing; high-Z shutdown prevents backfeed during suspend. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95831IRZ | Single-chip dual-phase controller with integrated MOSFET drivers; supports VR12.5/VR12.6 protocols and adaptive voltage positioning (AVP). | Targeted at high-end mobile CPUs requiring dynamic VID adjustment; lacks independent channel enable and fixed 1.8V/2.5V modes. | Select ISL95831IRZ when implementing Intel IMVP-7/8-compliant CPU core supplies with AVP; MAX8743EEI+ remains optimal for fixed-voltage chipset/I/O rails. |
| TPS51220ARUKR | TI dual buck controller with integrated 5V LDO bias supply; supports 0.5V–5.5V adjustable outputs and D-CAP™ control for <50ns transient response. | Includes internal 5V LDO, eliminating need for external 5V bias; optimized for low-VOUT (<1.5V) applications with higher current capability (12A per channel). | Choose TPS51220ARUKR when external 5V bias is unavailable or sub-1.2V core rails are required; MAX8743EEI+ excels where battery-direct conversion and minimal BOM are priorities. |
Compared with ISL95831IRZ and TPS51220ARUKR, the MAX8743EEI+ offers superior cost-efficiency for fixed-output notebook I/O and chipset rails, retains independent channel control without protocol overhead, and delivers proven 100ns transient performance with simpler compensation than D-CAP™ or VRM controllers.
Availability
MAX8743EEI+ is available at Aetrix Electronics and suitable for notebook computer power management, CPU core voltage regulation, and chipset/I/O supply generation requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX8743EEI+ 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 computing, automotive, and industrial applications.
The MAX8743 belongs to Maxim's notebook power-controller product line, engineered specifically for high-efficiency, fast-transient, dual-rail DC-DC conversion in space-constrained mobile platforms.
FAQ
What is the maximum supported battery input voltage for the MAX8743EEI+?
The MAX8743EEI+ supports a battery input voltage range of 2V to 28V, with absolute maximum rating of +30V on the V+ pin. This allows direct connection to multi-cell Li-ion batteries in notebook computers without intermediate pre-regulation, maximizing conversion efficiency in single-stage buck topologies.
Does the MAX8743EEI+ require an external 5V bias supply, and why?
Yes, the MAX8743EEI+ requires an external 4.5V–5.5V bias supply connected to VCC and VDD pins. This separates gate-drive and analog circuitry from the high-voltage battery rail, improving efficiency and eliminating the need for an on-chip linear regulator - a key design choice that reduces thermal load and system cost.
How does the TON pin affect switching frequency in the MAX8743EEI+?
The TON pin on the MAX8743EEI+ selects one of four nominal on-times via strap voltage (AGND/REF/float/VCC), setting OUT1 frequencies at 620kHz/485kHz/345kHz/235kHz respectively. OUT2 frequency is ~70% of OUT1's value. This enables EMI optimization and inductor sizing without changing external components.
Can the MAX8743EEI+ generate a 1.0V output, and what is the accuracy?
Yes, the MAX8743EEI+ supports adjustable outputs from 1.0V to 5.5V using resistor dividers on FB1/FB2. At 1.0V output, DC accuracy is maintained at ±1% over line, load, and temperature (–40°C to +85°C), as confirmed by FB1-to-OUT1 regulation data showing 0.985V–1.015V at full load and temperature extremes.
What is the purpose of the high-impedance shutdown feature in the MAX8743EEI+?
The high-impedance shutdown feature in the MAX8743EEI+ disables output drive while presenting near-infinite impedance at OUT1/OUT2 pins. This prevents reverse current flow and negative output voltages during shutdown, eliminating the need for external Schottky diodes and reducing BOM cost and PCB area in notebook power designs.
MAX8743EEI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8743EEI+ FAQ
1.How can I place an order for MAX8743EEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8743EEI+ 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 MAX8743EEI+ reliable?
The price and inventory of MAX8743EEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8743EEI+ is usually 5 days.
3.What payment methods are accepted for MAX8743EEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8743EEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8743EEI+?
MAX8743EEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8743EEI+ 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 MAX8743EEI+?
For technical support, including MAX8743EEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8743EEI+ requirements.
6.How does Aetrix verify that MAX8743EEI+ is sourced from the original manufacturer or authorized distributors?
All MAX8743EEI+ 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 MAX8743EEI+ meets industry standards.
7.What is the process for return or replacement of MAX8743EEI+?
All MAX8743EEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8743EEI+, 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 MAX8743EEI+ part is unused and in its original packaging.
Return procedure for MAX8743EEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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