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Analog Devices Inc./Maxim Integrated MAX77857CEWB+
- Part No.:
- MAX77857CEWB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 35-WFBGA, WLBGA
- Datasheet:
-
MAX77857CEWB+.pdf
- Description:
- IC REG BUCK BST PROG/3V 6A 35WLP
- Quantity:
- Payment:
- Shipping:
Inventory:3,387
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Product details
Overview
MAX77857CEWB+ from Analog Devices is a high-efficiency, I²C-programmable buck-boost converter designed for wide-input USB-PD and Quick Charge applications. It operates from 2.5V to 16V input, delivers up to 6A in buck mode and 4A in boost mode (boost ratio ≤1.3), features 7A switching current capability, and supports dynamic voltage scaling (DVS) from 4.5V–15V with internal feedback or 3V–15V with external feedback.
For engineers reviewing the MAX77857CEWB+ datasheet, MAX77857CEWB+ pinout, MAX77857CEWB+ application, or MAX77857CEWB+ equivalent, this device enables compact, thermally robust power delivery in notebook PCs, DRP ports, DSLR lens modules, and multi-cell Li-ion battery systems where input voltage varies widely and output voltage must be dynamically reconfigured under system control.
Technical Context
The MAX77857CEWB+ implements a synchronous 4-switch buck-boost topology with integrated high-side and low-side MOSFETs (RDSON_HS = 20–35 mΩ, RDSON_LS = 22–43 mΩ). It supports automatic transition between buck, buck-boost, and boost modes based on VIN/VOUT ratio, with seamless mode switching and programmable soft-start (2.0 ms).
Its dual-mode control architecture combines PWM operation with optional SKIP mode for light-load efficiency optimization, and integrates an I²C interface (Fast/Plus/High-Speed modes) that overrides RSEL-configured settings for output voltage, slew rate, current limit (8 options), switching frequency (1.1–2.27 MHz), and forced-PWM activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-cell to 3-cell Li-ion, USB PD, and legacy adapter inputs without pre-regulation |
| Output Current Capability | Buck mode: up to 6A continuous; Boost mode: up to 4A (boost ratio ≤1.3) - enables high-power VBUS delivery |
| Switching Current Limit | Configurable from 0.99A to 8.3A via RSEL or I²C - allows optimization of inductor size and thermal design per application |
| Output Voltage Range | 4.5V–15V (internal FB) or 3V–15V (external FB) - covers USB PD PPS, QC3.0, and display rail requirements |
| I²C Interface Support | Fast Mode (400 kHz), Fast-Mode Plus (1 MHz), High-Speed Mode (3.4 MHz) - enables real-time DVS and fault monitoring |
| Thermal Protection | Thermal shutdown at +150°C with 20°C hysteresis - ensures safe operation under sustained overload or poor PCB cooling |
| Package Type | 2.83mm × 2.03mm, 35-bump WLP (W352A2+1) - ultra-compact footprint for space-constrained mobile designs |
Pinout & Package
MAX77857CEWB+ is packaged in a 2.83mm × 2.03mm, 35-bump wafer-level package (WLP) with 0.4mm pitch, optimized for high-density mobile PCBs and compatible with standard reflow processes. The bump-side-down layout requires precise land pattern adherence per Application Note 1891.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Primary input supply (2.5V–16V); bypassed with dual 10μF/25V ceramic capacitors near package |
| OUT | Power Output | Regulated buck-boost output; requires dual 22μF/25V ceramic capacitors at point-of-load |
| LX1 / LX2 | Switching Nodes | Internal high-side/low-side FET connections; each requires dedicated 0.22μF/25V BST capacitor to AGND |
| FB | Voltage Feedback | Sense input for internal (5V default) or external resistor-divider programming of VOUT |
| SEL | Configuration Selector | Analog input setting I²C address, current limit threshold, and FB source via single external resistor |
| SCL / SDA | I²C Interface | Open-drain digital interface (1.08V–2.0V VIO domain); requires 1.5kΩ–2.2kΩ pull-ups to VIO |
| POKB/INTB | Status/Interrupt | Open-drain active-low output indicating POK status or fault condition (MAX77857B/C variant only) |
| VIO | IO Supply | Digital logic supply (1.08V–2.0V); regulator disabled if voltage falls below 0.955V |
| EN | Enable Control | Active-high enable with internal 0.1μA pulldown; compatible with VIO domain logic |
| VL | Internal LDO Output | 1.65V–1.89V regulated supply for internal circuitry; bypassed with 2.2μF/10V capacitor |
| AGND / PGND | Analog & Power Ground | Separate ground pins require low-inductance PCB connection to common ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Scaling (DVS) | Adjustable output voltage in 73.5mV steps (4.5V–15V) via I²C - enables adaptive power delivery for SoC DVFS |
| Programmable Slew Rate | Four configurable dV/dt options (1/6 to 4/3 mV/µs) - prevents inrush current and stabilizes downstream regulators |
| Multi-Mode Efficiency Optimization | Automatic SKIP-to-PWM transition plus forced-PWM mode - maintains >90% efficiency across 1mA–6A load range |
| Integrated Protection Suite | UVLO (2.4V), OCP (programmable), OVP (16.4V), thermal shutdown (150°C) - eliminates need for discrete protection ICs |
| Compact Solution Size | 4.2mm × 4.4mm typical layout (excluding inductor) - achieves <55.4mm² total solution area for 20W output |
Applications
| USB Power Delivery (USB-PD) OTG | Qualcomm® Quick Charge™ |
|---|---|
Use Scenario: Portable power bank delivering 5V/3A or 9V/2A to smartphones via USB-C cable. IC Role / Device Role / Timing Role: Primary buck-boost regulator managing bidirectional VBUS voltage and current negotiation. Use Value: Enables compliance with USB PD 3.0 PPS and QC3.0 protocols using single-chip solution with no external MOSFETs or controllers. |
Use Scenario: Smartphone fast-charging subsystem adapting input from wall adapter to battery charging voltage. IC Role / Device Role / Timing Role: Adaptive voltage regulator supplying variable VBUS to charging IC while maintaining tight regulation during transitions. Use Value: Supports QC3.0's 200mV step voltage adjustments with <2ms settling time, reducing charge time by up to 30% vs fixed-output converters. |
| DRP (Dual Role Power) Port | DSLR Lens Power |
Use Scenario: Laptop or tablet with reversible USB-C port acting as both power source and sink. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller enabling automatic role swap between source/sink based on CC line detection. Use Value: Eliminates need for separate source/sink ICs; supports simultaneous VBUS regulation and fault reporting via POK/INTB pin. |
Use Scenario: Autofocus and image stabilization motors in interchangeable camera lenses requiring stable 5V–12V rails. IC Role / Device Role / Timing Role: Compact, high-efficiency power stage converting battery voltage to multiple precision lens motor supplies. Use Value: Delivers clean, ripple-free output with <1% load regulation and active discharge (<5ms) for safe lens power-down. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77854AEWB+T | Same 35-bump WLP package; lower 5A max output current; fixed 5V default output; no POK/INTB pin | Suitable for cost-sensitive USB-PD sink-only designs without dynamic voltage scaling | Select when DVS, boost-mode current >4A, or fault interrupt reporting are not required |
| RTQ2132BWGE | 3.5mm × 3.5mm QFN-16; 6A buck-boost; no I²C interface; analog FB only; higher quiescent current (120µA) | Targeted at industrial embedded systems needing robustness over programmability | Choose when I²C control is unnecessary and board space permits larger package |
Compared with MAX77857CEWB+, MAX77854AEWB+T offers reduced feature set and lower current capability but identical footprint and pinout, while RTQ2132BWGE provides comparable output performance without digital configurability-making MAX77857CEWB+ optimal for space-constrained, protocol-aware mobile power delivery.
Availability
MAX77857CEWB+ is available at Aetrix Electronics and suitable for USB-PD OTG power banks, Qualcomm Quick Charge smartphone adapters, and DSLR lens modules requiring stable component supply, full RoHS compliance, and guaranteed long-term availability.
Supply support for MAX77857CEWB+ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The MAX77857CEWB+ belongs to Analog Devices' MAXPower family of highly integrated power management ICs, engineered specifically for mobile and portable devices demanding wide-input, high-current, digitally controllable DC-DC conversion.
FAQ
What is the default output voltage of the MAX77857CEWB+?
The MAX77857CEWB+ defaults to 5V output when using internal feedback resistors. With external feedback resistors, the startup voltage can be configured between 3V and 15V. The I²C interface allows dynamic reconfiguration of the output voltage post-startup-enabling MAX77857CEWB+ to support USB PD Programmable Power Supply (PPS) and Qualcomm Quick Charge protocols without hardware changes.
Does the MAX77857CEWB+ support both buck and boost operation?
Yes, the MAX77857CEWB+ is a true 4-switch synchronous buck-boost converter that automatically transitions between buck, buck-boost, and boost modes depending on input and output voltage conditions. It delivers up to 6A in buck mode and up to 4A in boost mode (with boost ratio ≤1.3), making MAX77857CEWB+ ideal for applications like USB-PD DRP ports where VIN may fall below or rise above VOUT.
What package type is used for the MAX77857CEWB+?
The MAX77857CEWB+ uses a 2.83mm × 2.03mm, 35-bump wafer-level package (WLP) with 0.4mm pitch, designated as W352A2+1. This ultra-compact package minimizes PCB area and thermal resistance (θJA = 49°C/W on four-layer board), and is optimized for high-density mobile applications such as smartphones and compact power banks where MAX77857CEWB+ is commonly deployed.
Can the MAX77857CEWB+ operate without an I²C interface?
Yes, the MAX77857CEWB+ supports standalone operation using the SEL pin to configure I²C address, current limit, and feedback source via a single external resistor. In non-I²C mode, MAX77857CEWB+ retains all core regulation functionality-including UVLO, OCP, OVP, thermal shutdown, soft-start, and active discharge-making it viable for simpler designs where dynamic control is not required.
What protection features does the MAX77857CEWB+ include?
The MAX77857CEWB+ integrates undervoltage lockout (UVLO at 2.4V), overcurrent protection (OCP with 8 programmable thresholds), overvoltage protection (OVP at 16.4V), and thermal shutdown (150°C with 20°C hysteresis). These protections are fully internal and require no external components-ensuring reliable MAX77857CEWB+ operation in battery-powered systems subject to voltage transients, short circuits, or thermal overload.
MAX77857CEWB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 35-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3V (5V)
- Voltage - Output (Max):
- 15V
- Current - Output:
- 6A
- Frequency - Switching:
- 1.2MHz, 1.5MHz, 1.8MHz, 2.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 35-WLP (2.83x2.03)
MAX77857CEWB+ FAQ
1.How can I place an order for MAX77857CEWB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77857CEWB+ 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 MAX77857CEWB+ reliable?
The price and inventory of MAX77857CEWB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77857CEWB+ is usually 5 days.
3.What payment methods are accepted for MAX77857CEWB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77857CEWB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77857CEWB+?
MAX77857CEWB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77857CEWB+ 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 MAX77857CEWB+?
For technical support, including MAX77857CEWB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77857CEWB+ requirements.
6.How does Aetrix verify that MAX77857CEWB+ is sourced from the original manufacturer or authorized distributors?
All MAX77857CEWB+ 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 MAX77857CEWB+ meets industry standards.
7.What is the process for return or replacement of MAX77857CEWB+?
All MAX77857CEWB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77857CEWB+, 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 MAX77857CEWB+ part is unused and in its original packaging.
Return procedure for MAX77857CEWB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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