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Analog Devices Inc./Maxim Integrated MAX8649EWE+T
- Part No.:
- MAX8649EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFBGA, WLBGA
- Datasheet:
-
MAX8649EWE+T.pdf
- Description:
- IC REG BUCK PROG 1.8A 16WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,160
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Product details
Overview
MAX8649EWE+T from Maxim Integrated is a high-efficiency, 3.25MHz synchronous step-down DC-DC regulator delivering up to 1.8A output current with I²C-programmable output voltage (0.75V–1.38V in 10mV steps), remote sense for ±2% total output error over load/line/temperature, and dual input rails (IN1/IN2) operating from 2.5V to 5.5V. It targets core power delivery in space-constrained mobile SoC applications such as smartphone application processors.
For engineers reviewing the MAX8649EWE+T datasheet, MAX8649EWE+T pinout, MAX8649EWE+T application, or MAX8649EWE+T equivalent, key selection criteria include its 2mm × 2mm WLP package, 400kHz I²C interface with 0xC0/0xC1 address, forced-PWM vs. power-save mode trade-offs, and synchronization capability to 13/19.2/26MHz system clocks.
Technical Context
The MAX8649EWE+T integrates p-channel and n-channel MOSFETs with synchronous rectification, enabling high efficiency across load ranges. Its proprietary hysteretic PWM control dynamically transitions between fixed-frequency (3.25MHz) and variable-frequency operation based on consecutive zero-crossing detection-16 cycles to enter power-save mode, 8 to re-enter forced-PWM.
Remote sensing via SNS+/SNS− ensures precise regulation at the load point, while VID0/VID1 logic inputs allow hardware-selectable voltage modes (four presets), and the I²C interface enables full register-level configuration including ramp rate (RAMP[2:0]), synchronization enable, and operating mode-without requiring external components for basic functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.8A continuous - supports high-current digital loads like application processors without external current boosting. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion, Li-polymer, and multi-cell alkaline/battery-backed systems. |
| Output Voltage Range | 0.75V to 1.38V in 10mV steps - fine-grained dynamic voltage scaling (DVS) for CPU/GPU DVFS compliance. |
| Switching Frequency | Fixed 3.25MHz (±10%) - enables use of ultra-small 1.0µH inductors and reduces EMI filter size. |
| I²C Address | 0xC0 (write) / 0xC1 (read) - allows coexistence with other I²C devices on shared bus without address conflict. |
| Package | 16-bump, 2mm × 2mm WLP (0.5mm pitch) - ultra-compact footprint ideal for thin mobile PCBs with tight layout constraints. |
| Shutdown Current | <1µA - preserves battery life during deep sleep states in portable electronics. |
Pinout & Package
MAX8649EWE+T uses a 16-bump Wafer-Level Package (WLP) measuring 2mm × 2mm with 0.5mm pitch. Bumps are located on the bottom side; top-side markings align with standard orientation diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | IN1 | Analog supply input (2.5V–5.5V); requires 11Ω series resistor and local 0.1µF bypass to AGND. |
| A2 | AGND | Analog ground reference; must connect directly to low-noise PCB ground plane. |
| A3 | VID1 | Voltage ID select bit 1 - used with VID0 to choose among four preloaded I²C register sets for VOUT and mode. |
| A4 | IN2 | Power supply input for internal FETs (2.5V–5.5V); bypassed with 10µF + 0.1µF to PGND. |
| B1 | SNS+ | Remote sense positive input - connects directly to load point to compensate for IR drop in PCB traces. |
| B2 | EN | Enable logic input - active-high; includes internal pulldown resistor (200–450kΩ) for default shutdown. |
| B3, B4 | LX | Switch node - connects to inductor; high-impedance during shutdown; drives internal p-FET/n-FET drains. |
| C1 | SNS− | Remote sense negative input - connects to quiet local ground at IC to complete Kelvin sense loop. |
| C2 | VID0 | Voltage ID select bit 0 - pairs with VID1 to configure startup VOUT, mode (PWM/power-save), and SYNC enable. |
| C3, C4 | PGND | Power ground - low-impedance return path for LX current; must tie both bumps to solid PCB ground plane. |
| D1 | VDD | Logic supply (1.8V–3.6V) for I²C/SYNC interface; UVLO threshold at 0.865V (typ) resets registers on brownout. |
| D2 | SDA | I²C data line - open-drain, 400kHz compliant; requires external pull-up to VDD. |
| D3 | SCL | I²C clock input - accepts 400kHz master clock; timing meets standard I²C bus specifications. |
| D4 | SYNC | External clock sync input - accepts 13/19.2/26MHz system clocks; no internal pulldown; tie to AGND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Sense Accuracy | ±2% total output error over load, line, and temperature - maintains tight regulation at processor die despite PCB IR loss. |
| Dynamic Voltage Scaling (DVS) | Hardware VID0/VID1 + I²C programmability - enables real-time VOUT adjustment for CPU frequency scaling without firmware overhead. |
| Efficiency Optimization | Power-save mode with hysteretic light-load operation - achieves >90% efficiency at 1mA load (0.9V out), reducing quiescent power. |
| Robust Protection | Integrated OVP (1.65–1.9V), OCP (2.3–3.2A peak), thermal shutdown (+160°C), and UVLO on IN1/VDD - eliminates need for external fault management. |
| Startup Control | Internal soft-start + prebias startup support - prevents inrush into partially charged outputs and avoids reverse current flow. |
Applications
| Smartphone Application Processor Core Power | Tablet SoC DVFS Rail |
|---|---|
|
Use Scenario: Powers ARM-based application processors (e.g., Snapdragon, Exynos) requiring dynamic voltage/frequency scaling across performance states. IC Role / Device Role / Timing Role: Primary core voltage regulator with remote sense, synchronized to SoC clock domain via SYNC pin. Use Value: Enables sub-1V operation at 1.8A with <2% output error, supporting aggressive power gating and leakage reduction. |
Use Scenario: Supplies GPU and multimedia subsystems in tablets where thermal headroom and battery runtime are critical. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in power-save mode during video playback/idle, switching to forced-PWM under compute load. Use Value: Delivers >92% efficiency at 500mA (1.1V), extending battery life by minimizing light-load losses. |
| Ultra-Thin Wearable MCU Supply | Portable Medical Sensor Hub |
|
Use Scenario: Powers Cortex-M series MCUs in compact wearables where board area is constrained to <100mm². IC Role / Device Role / Timing Role: Space-optimized 2mm × 2mm WLP regulator with integrated FETs and no external diode required. Use Value: Reduces BOM count by eliminating Schottky diode and saves 2.5mm² PCB area versus QFN alternatives. |
Use Scenario: Supplies analog front-end and low-power ADCs in FDA-cleared glucose monitors and ECG patches. IC Role / Device Role / Timing Role: Low-noise, stable core rail with remote sense ensuring accurate sensor biasing despite flex-cable voltage drop. Use Value: Maintains ±10mV regulation at load point, preventing gain drift in precision analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8952EWE+T | 2.5A output rating, same 2mm × 2mm WLP package, identical I²C interface and remote sense architecture. | Targets higher-current SoCs (e.g., quad-core A-series processors) requiring >1.8A sustained delivery. | Select when peak load exceeds 1.8A; shares layout compatibility but requires validation of thermal margin at 2.5A. |
| TPS62290DRVR | 1.8A output, 2.25MHz fixed frequency, 2mm × 2mm WSON package, no remote sense, no VID pins. | Used in cost-sensitive consumer electronics where ±2% regulation tolerance and DVS are not required. | Choose for simplified design with lower gate count; lacks remote sensing and hardware VID control, limiting precision in high-current layouts. |
Compared with MAX8649EWE+T, MAX8952EWE+T offers higher current headroom in identical form factor, while TPS62290DRVR trades remote sensing and VID flexibility for reduced system cost and complexity-making it suitable only where load-point accuracy and dynamic scaling are secondary.
Availability
MAX8649EWE+T is available at Aetrix Electronics and suitable for smartphone power management, wearable SoC supplies, and portable medical device designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8649EWE+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) designs high-performance analog and mixed-signal ICs for power, sensing, and connectivity in portable, industrial, and automotive systems.
The MAX8649/MAX8649A product line delivers ultra-compact, high-efficiency DC-DC regulators optimized for dynamic voltage scaling in battery-powered mobile processors and SoCs.
FAQ
What is the I²C address of the MAX8649EWE+T?
The MAX8649EWE+T uses a fixed I²C write address of 0xC0 and read address of 0xC1. This unique address allows multiple MAX8649EWE+T devices to coexist on the same I²C bus when paired with MAX8649AEWE+T (0xC4/0xC5), enabling independent voltage rail control in multi-core systems.
Does the MAX8649EWE+T support remote sensing, and how is it implemented?
Yes, the MAX8649EWE+T implements true Kelvin remote sensing using dedicated SNS+ and SNS− terminals. SNS+ connects directly to the load point (e.g., CPU VDD pin), while SNS− ties to a quiet local ground near the IC, forming a closed-loop feedback path that compensates for PCB trace resistance and maintains ±2% output accuracy at the point of load.
How does the MAX8649EWE+T handle light-load efficiency?
The MAX8649EWE+T automatically switches from fixed-frequency PWM mode to power-save mode under light loads using a proprietary hysteretic control scheme. When consecutive zero-crossing cycles exceed 16, it enters hysteretic operation-reducing switching frequency and achieving >90% efficiency at 1mA, significantly lowering quiescent power versus forced-PWM-only regulators.
Can the MAX8649EWE+T synchronize to an external clock, and what frequencies are supported?
Yes, the MAX8649EWE+T supports external clock synchronization via its SYNC pin, accepting 13MHz, 19.2MHz, or 26MHz system clocks. The IC measures the incoming clock stability before locking, ensuring reliable frequency alignment-critical for EMI reduction in noise-sensitive RF sections of smartphones and tablets.
What protection features are integrated into the MAX8649EWE+T?
The MAX8649EWE+T integrates output overvoltage protection (1.65–1.9V trip), overcurrent protection (2.3–3.2A peak p-FET limit), thermal shutdown (+160°C), input undervoltage lockout (2.15V on IN1), and VDD UVLO (0.865V). These features eliminate the need for external fault monitoring circuitry in compact portable designs.
MAX8649EWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 1.38V
- Current - Output:
- 1.8A
- Frequency - Switching:
- 3.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLP
MAX8649EWE+T FAQ
1.How can I place an order for MAX8649EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8649EWE+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 MAX8649EWE+T reliable?
The price and inventory of MAX8649EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8649EWE+T is usually 5 days.
3.What payment methods are accepted for MAX8649EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8649EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8649EWE+T?
MAX8649EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8649EWE+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 MAX8649EWE+T?
For technical support, including MAX8649EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8649EWE+T requirements.
6.How does Aetrix verify that MAX8649EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX8649EWE+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 MAX8649EWE+T meets industry standards.
7.What is the process for return or replacement of MAX8649EWE+T?
All MAX8649EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8649EWE+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 MAX8649EWE+T part is unused and in its original packaging.
Return procedure for MAX8649EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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