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Analog Devices Inc./Maxim Integrated MAX8649AEWE+
- Part No.:
- MAX8649AEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFBGA, WLBGA
- Datasheet:
-
MAX8649AEWE+.pdf
- Description:
- IC REG BUCK PROG 1.8A 16WLP
- Quantity:
- Payment:
- Shipping:
Inventory:3,189
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Product details
Overview
MAX8649AEWE+ 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, 2.5V–5.5V). It serves as the core power supply for application processors in space-constrained mobile devices.
For engineers reviewing the MAX8649AEWE+ datasheet, MAX8649AEWE+ pinout, MAX8649AEWE+ application, or MAX8649AEWE+ equivalent, key selection considerations include its 16-bump 2mm × 2mm WLP package, 400kHz I²C interface with unique 0xC4/0xC5 address, synchronization capability to 13/19.2/26MHz system clocks, and support for dynamic voltage scaling via VID0/VID1 control inputs.
Technical Context
The MAX8649AEWE+ integrates p-channel and n-channel MOSFETs with synchronous rectification, enabling high efficiency across load ranges. Its proprietary hysteretic PWM control enables seamless transition between forced-PWM (fixed 3.25MHz) and power-save modes based on consecutive zero-crossing detection - biasing occurs after >16 cycles, full hysteretic operation begins after >24 cycles.
Remote sensing via SNS+/SNS− ensures precise regulation at the load point, while internal DAC and RAMP[2:0] register provide programmable 10mV-step voltage adjustment and controlled ramp rates (0.254–32.5 mV/µs). The device supports four VID-configurable operating modes (MODE0–MODE3), each independently setting output voltage, PWM/hysteretic mode, and SYNC enable state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.8A continuous - sufficient to power modern application processors or GPU cores without external current sharing. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion, Li-polymer, and multi-cell alkaline battery systems. |
| Output Voltage Range | 0.75V to 1.38V in 10mV steps - enables fine-grained dynamic voltage scaling for CPU/GPU DVFS schemes. |
| Switching Frequency | Fixed 3.25MHz (±10% PWM, ±25% hysteretic) - allows use of ultra-small 1.0µH inductors and reduces EMI filtering burden. |
| I²C Address | 0xC4 (write) / 0xC5 (read) - enables coexistence with MAX8649EWE+ (0xC0/0xC1) on same bus for multi-rail systems. |
| Package | 16-bump WLP, 2mm × 2mm, 0.5mm pitch - optimized for ultra-thin mobile PCBs with minimal board area footprint. |
| Shutdown Current | <1µA - preserves battery life during deep sleep states in smartphones and wearables. |
Pinout & Package
MAX8649AEWE+ uses a 16-bump wafer-level package (WLP) with 0.5mm pitch, measuring 2mm × 2mm. Bumps are located on the bottom side; top-side markings align with standard WLP orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | IN1 | Analog input rail (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 logic input; selects one of four preloaded I²C register sets for fast mode switching. |
| A4 | IN2 | Power 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 for precision regulation. |
| B2 | EN | Enable input with internal pulldown; active-high logic controls regulator startup/shutdown. |
| B3, B4 | LX | Switch node connecting internal p-FET drain and n-FET drain; drives external inductor. |
| C1 | SNS− | Remote sense negative input; connects to quiet ground at IC for differential sensing. |
| C2 | VID0 | Voltage ID logic input; pairs with VID1 to select MODE0–MODE3 configuration. |
| C3, C4 | PGND | Power ground for high-current paths; both bumps must connect to solid PCB ground plane. |
| D1 | VDD | I²C logic supply (1.8V–3.6V); powers SDA/SCL/SYNC interface; UVLO resets registers if dropped. |
| D2 | SDA | I²C bidirectional data line; operates at 400kHz with 3mA sink capability and 0.4V max low level. |
| D3 | SCL | I²C clock input; requires external pull-up; supports standard-mode timing (tHIGH/tLOW ≥ 0.6µs). |
| D4 | SYNC | External clock input (13/19.2/26MHz); no internal pulldown - tie to AGND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Sense Architecture | Differential SNS+/SNS− inputs eliminate IR drop errors, ensuring ±2% regulation accuracy at the load under all conditions. |
| Dynamic Voltage Scaling (DVS) | Four VID-selectable modes (MODE0–MODE3) allow real-time voltage changes without I²C transaction overhead. |
| Adaptive Mode Control | Automatic transition between forced-PWM and hysteretic operation based on zero-crossing cycle count - no software intervention required. |
| Programmable Ramp Rate | RAMP[2:0] register sets voltage slew rate from 0.254 to 32.5 mV/µs, preventing overshoot/undershoot during DVFS transitions. |
| Integrated Power Path | On-chip p-FET (0.08Ω typ) and n-FET (0.06Ω typ) eliminate external MOSFETs and Schottky diodes, reducing BOM count and layout complexity. |
Applications
| Smartphone Application Processor Core Rail | Tablet SoC I/O Voltage Rail |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores in flagship smartphones requiring rapid DVFS transitions between 0.75V (idle) and 1.38V (peak performance). IC Role / Device Role / Timing Role: Primary buck converter with remote sense feedback, I²C-controlled voltage scaling, and 3.25MHz switching for compact filter design. Use Value: Enables sub-2% output error at load point and <1µA shutdown current - extending battery runtime by >12% in standby. |
Use Scenario: Supplies configurable I/O voltage (0.9V–1.2V) to application-specific integrated circuits (ASICs) in 7–10 inch tablets. IC Role / Device Role / Timing Role: Secondary regulated rail supporting multiple voltage domains; synchronized to system clock to reduce spectral noise coupling. Use Value: 16-bump WLP footprint saves >35% PCB area vs. QFN alternatives, critical for thin-profile tablet designs. |
| Wearable System-on-Chip (SoC) Power | Ultra-Thin Portable Media Player Rail |
|
Use Scenario: Delivers 1.05V @ 1.2A to low-power wearable SoCs (e.g., Nordic nRF54 series) with strict thermal and size constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency buck regulator with power-save mode for extended battery life and low quiescent current. Use Value: Achieves >90% efficiency at 10mA load in power-save mode - doubling runtime in always-on sensor monitoring applications. |
Use Scenario: Supplies 0.9V core voltage to audio DSPs and video decoders in portable MP3/MP4 players with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Input-flexible (2.5V–5.5V) buck regulator supporting wide battery voltage swing during discharge. Use Value: 2.5V minimum input enables stable operation down to 20% battery capacity - avoiding premature shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8649EWE+ | Different I²C address (0xC0/0xC1 vs. 0xC4/0xC5); identical electrical specs, pinout, and package. | Used when multiple regulators share same I²C bus - avoids address conflict in multi-rail systems. | Select MAX8649EWE+ only when bus addressing requires distinct write/read addresses; otherwise MAX8649AEWE+ is functionally identical. |
| MAX8952ETA+ | Higher 2.5A output current; wider 0.6V–2.0V output range; same 2mm × 2mm WLP package and I²C interface. | Targets higher-power application processors (e.g., quad-core Cortex-A9) requiring >1.8A sustained current. | Choose MAX8952ETA+ only if peak load exceeds 1.8A or output voltage must extend below 0.75V or above 1.38V. |
Compared with MAX8649EWE+, MAX8649AEWE+ provides identical performance but avoids I²C address collision in multi-regulator systems; versus MAX8952ETA+, it trades 0.7A current headroom and extended voltage range for tighter integration in lower-power mobile SoCs.
Availability
MAX8649AEWE+ is available at Aetrix Electronics and suitable for smartphone processor core rails, tablet SoC I/O supplies, wearable SoC power, and ultra-thin media player applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MAX8649AEWE+ 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 mobile, industrial, and communications markets.
The MAX8649/MAX8649A product line was designed specifically for space-constrained, battery-powered mobile devices requiring high-efficiency, dynamically scalable power with ultra-small footprint and remote sensing precision.
FAQ
What is the I²C address of the MAX8649AEWE+?
The MAX8649AEWE+ uses a fixed I²C write address of 0xC4 and read address of 0xC5. This distinguishes it from the MAX8649EWE+ (0xC0/0xC1), allowing both variants to coexist on the same I²C bus without address conflict. The address is hardwired and not user-programmable.
Does the MAX8649AEWE+ support remote sensing, and how is it implemented?
Yes, the MAX8649AEWE+ implements true remote sensing using dedicated SNS+ and SNS− terminals. SNS+ connects directly to the load's VOUT node, while SNS− connects to a quiet ground point near the IC. This differential sensing compensates for PCB trace resistance, maintaining ±2% output accuracy at the load under all operating conditions.
How does the MAX8649AEWE+ handle light-load efficiency?
The MAX8649AEWE+ automatically switches from forced-PWM to power-save (hysteretic) mode under light loads - triggered after detecting more than 16 consecutive zero-crossing cycles. This reduces switching frequency and quiescent current, achieving >90% efficiency at 10mA while maintaining fast transient response.
Can the MAX8649AEWE+ synchronize its switching frequency to an external clock?
Yes, the MAX8649AEWE+ accepts 13MHz, 19.2MHz, or 26MHz system clocks on the SYNC pin. When enabled via I²C, the internal oscillator locks to fSYNC/4, fSYNC/6, or fSYNC/8 respectively - aligning switching harmonics for easier EMI filtering in noise-sensitive RF sections of mobile devices.
What is the purpose of the VID0 and VID1 pins on the MAX8649AEWE+?
VID0 and VID1 are hardware-selectable inputs that choose among four preconfigured operating modes (MODE0–MODE3), each defining output voltage, PWM/hysteretic mode, and SYNC enable state. This enables instantaneous voltage changes without I²C transactions - critical for real-time DVFS in application processors powered by MAX8649AEWE+.
MAX8649AEWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFBGA, WLBGA
- Packaging:
- Bulk
- 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
MAX8649AEWE+ FAQ
1.How can I place an order for MAX8649AEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8649AEWE+ 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 MAX8649AEWE+ reliable?
The price and inventory of MAX8649AEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8649AEWE+ is usually 5 days.
3.What payment methods are accepted for MAX8649AEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8649AEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8649AEWE+?
MAX8649AEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8649AEWE+ 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 MAX8649AEWE+?
For technical support, including MAX8649AEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8649AEWE+ requirements.
6.How does Aetrix verify that MAX8649AEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX8649AEWE+ 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 MAX8649AEWE+ meets industry standards.
7.What is the process for return or replacement of MAX8649AEWE+?
All MAX8649AEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8649AEWE+, 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 MAX8649AEWE+ part is unused and in its original packaging.
Return procedure for MAX8649AEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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