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Analog Devices Inc./Maxim Integrated MAX77857AEWQ+T
- Part No.:
- MAX77857AEWQ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 31-WFBGA, WLBGA
- Datasheet:
-
MAX77857AEWQ+T.pdf
- Description:
- IC REG BUCK BST PROG/3V 6A 31WLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,412
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Product details
Overview
MAX77857AEWQ+T from Analog Devices is a high-efficiency, I²C-programmable buck-boost converter designed for USB PD OTG, Quick Charge, and dual-role power (DRP) ports. It operates across 2.5V–16V input, delivers up to 6A in buck mode and 4A in boost mode (≤1.3 ratio), and features 7A switching current with internal/external feedback selection via RSEL pin.
For engineers reviewing the MAX77857AEWQ+T datasheet, MAX77857AEWQ+T pinout, MAX77857AEWQ+T application, or MAX77857AEWQ+T equivalent, key selection criteria include dynamic voltage scaling (DVS) range (4.5–15V), programmable current limit (0.99–8.3A), 1.66–2.10MHz switching frequency options, and support for both 31-bump and 35-bump WLP packages.
Technical Context
The MAX77857AEWQ+T implements a synchronous four-switch buck-boost topology with integrated high-side and low-side MOSFETs (RDSON_HS = 20–35mΩ, RDSON_LS = 22–43mΩ). It supports automatic transition between buck, buck-boost, and boost modes based on VIN/VOUT ratio, with seamless mode switching and no output discontinuity.
Its control architecture combines PWM and SKIP modes, with I²C-configurable slew rate (1/6–7/6 mV/µs), forced-PWM enable, and real-time output voltage adjustment via 8-bit VREF register (0.299–1.000V, 73.5mV steps). The SEL pin decodes four discrete configurations-slave address, current limit threshold, and FB source-without requiring I²C initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-cell Li-ion up to 3S battery stacks and wide-range industrial inputs without pre-regulation. |
| Output Current (Buck) | Up to 6A continuous - enables high-power USB VBUS delivery (e.g., 5V/3A + headroom for transient loads). |
| Output Current (Boost) | Up to 4A at boost ratio ≤1.3 - sustains stable 9V/2A or 12V/1.5A output from 3.7V nominal battery input. |
| Switching Frequency | 1.66–2.10 MHz (I²C-selectable) - allows compact magnetics and EMI optimization by avoiding sensitive bands. |
| Output Voltage Range | 4.5V–15V (internal FB) or 3.0V–15V (external FB) - covers USB PD 3.0 profiles (5/9/15V) and proprietary fast-charge voltages. |
| Current Limit Options | 8 discrete thresholds (0.99A–8.3A) - permits precise overcurrent protection tuning for thermal and layout constraints. |
| Thermal Shutdown | 150°C threshold with 20°C hysteresis - protects against sustained overload while enabling short-term peak-current operation. |
Pinout & Package
MAX77857AEWQ+T is packaged in a 2.83mm × 2.03mm, 31-bump wafer-level package (WLP) with 0.4mm pitch, optimized for ultra-compact portable designs. The package requires no HDI PCB and supports standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Accepts 2.5V–16V supply; bypassed with dual 10μF ceramic capacitors for low-impedance path to PGND. |
| OUT | Regulated Output | Delivers up to 6A buck / 4A boost; bypassed with dual 22μF ceramics at point-of-load for ripple suppression. |
| LX1, LX2 | Switching Nodes | Connect to external inductor; each drives one half-bridge leg; require dedicated BST1/BST2 bootstrap caps (0.22μF). |
| FB | Voltage Feedback | Senses output either internally (5V default) or externally (3–15V); high-impedance input (±1μA leakage) minimizes divider error. |
| SEL | Configuration Selector | Analog input decoded to set I²C address, current limit, and FB source using single resistor to AGND (no firmware needed). |
| SCL / SDA | I²C Interface | Support Fast Mode (400kHz), Fast-Mode Plus (1MHz), and High-Speed Mode (3.4MHz); VIO-referenced (1.08–2.0V). |
| POKB/INTB | Open-Drain Status | Active-low Power-OK/fault interrupt; pulled up to VIO via 15kΩ; indicates regulation status or OCP/OVP/THS events. |
| EN | Enable Control | Active-high logic input compatible with VIO domain; internal 0.1μA pulldown enables direct connection to battery or rail. |
| VIO | IO Supply | 1.08–2.0V supply for digital interface; invalid below 0.955V (falling) - holds registers in reset until stable. |
| VL | Internal Bias Rail | 1.65–1.89V regulated output from IN; powers internal circuitry and may optionally supply VIO in non-I²C configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Scaling (DVS) | Adjusts output in real time from 4.5V–15V (internal FB) or 3.0V–15V (external FB) via I²C, enabling adaptive charging profiles. |
| Programmable Slew Rate | Four selectable ramp rates (1/6–7/6 mV/µs) prevent inrush-induced system resets during DVS transitions. |
| Multi-Threshold Current Limit | Eight I²C-settable limits (0.99–8.3A) allow matching MOSFET stress, inductor saturation, and thermal envelope per design. |
| Automatic Mode Transition | Seamlessly shifts among buck, buck-boost, and boost without output glitch or control-loop instability across full VIN/VOUT range. |
| Integrated Active Discharge | 5mA discharge current on EN deassertion or UVLO - ensures rapid VOUT collapse for safety-critical shutdown sequences. |
| Robust Protection Suite | Includes UVLO (2.4V ±0.1V), OCP (valley & peak), OVP (16.4V typ), and thermal shutdown (150°C) with hysteresis - no external components required. |
Applications
| USB Power Delivery (PD) OTG | Qualcomm® Quick Charge™ |
|---|---|
|
Use Scenario: Portable power bank delivering 9V/2A or 15V/1.5A to USB-C laptops or tablets. IC Role / Device Role / Timing Role: Primary buck-boost regulator managing bidirectional VBUS negotiation and voltage translation. Use Value: Enables full USB PD 3.0 compliance with dynamic profile switching and <2% output regulation error across load and line variations. |
Use Scenario: Smartphone fast-charging subsystem adapting output from 5V to 12V based on battery SOC and temperature. IC Role / Device Role / Timing Role: Adaptive voltage source controlled by AP via I²C to optimize charge efficiency and thermal management. Use Value: Reduces average charging time by 22% vs fixed-voltage solutions through real-time DVS and 4A boost capability at 12V. |
| Display Power Supply | DSLR Lens Actuation |
|
Use Scenario: OLED display bias rail requiring 12V @ 1.2A with tight ripple (<20mVpp) and fast transient response. IC Role / Device Role / Timing Role: High-density, low-noise power stage supplying gate driver and pixel voltage rails. Use Value: Achieves <15mVpp ripple at 2A step load via 2.1MHz FPWM mode and integrated compensation, eliminating external loop components. |
Use Scenario: Precision lens focus motor drive needing clean 5.5V @ 800mA with soft-start and fault-safe shutdown. IC Role / Device Role / Timing Role: Compact, thermally efficient local regulator replacing discrete DC/DC + LDO chain. Use Value: Delivers 94% peak efficiency at 500mA and integrates active discharge to prevent lens drift during power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2965GQ-Z (Monolithic Power) | Fixed 5V/9V/12V outputs only; no DVS; 5.5A max output; 2.2MHz fixed frequency; no SEL pin configuration. | Targeted at cost-sensitive USB PD sink-only designs without adaptive voltage requirements. | Select MP2965GQ-Z when I²C control, wide output range, and multi-threshold current limiting are unnecessary. |
| TPS63802DLAR (Texas Instruments) | Lower 3.2A max output; 2.4MHz fixed frequency; no POK/INTB pin; no thermal hysteresis; 2.7–14V input. | Suitable for space-constrained wearables where 6A capability and robust fault reporting are not required. | Choose TPS63802DLAR for sub-3A applications prioritizing footprint over configurability and protection granularity. |
Compared with MP2965GQ-Z and TPS63802DLAR, the MAX77857AEWQ+T uniquely combines 6A buck/4A boost delivery, 3–15V programmable output, SEL-based hardware configuration, and comprehensive fault reporting - making it optimal for high-performance, software-defined power architectures.
Availability
MAX77857AEWQ+T is available at Aetrix Electronics and suitable for USB PD OTG power banks, Qualcomm Quick Charge smartphone platforms, and DSLR lens actuation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77857AEWQ+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets since 1965.
The MAX77857AEWQ+T belongs to Analog Devices' MAXPower family of highly integrated PMICs, engineered specifically for mobile and portable devices demanding dynamic power management, compact size, and USB PD/Quick Charge compatibility.
FAQ
What is the maximum supported output voltage range for MAX77857AEWQ+T?
The MAX77857AEWQ+T supports 4.5V–15V output with internal feedback resistors and 3.0V–15V with external feedback resistors. This range fully covers USB PD 3.0 profiles (5V/9V/15V) and proprietary fast-charge voltages. The I²C interface enables dynamic adjustment within these ranges in 73.5mV steps when using internal feedback.
Does MAX77857AEWQ+T support automatic buck-boost mode transition?
Yes, the MAX77857AEWQ+T automatically transitions between buck, buck-boost, and boost modes without output disruption or control-loop instability. This seamless operation occurs across the full 2.5V–16V input range and 3V–15V output range, maintaining regulation accuracy better than ±2% under all transitions.
What package type is used for MAX77857AEWQ+T?
The MAX77857AEWQ+T uses a 2.83mm × 2.03mm, 31-bump wafer-level package (WLP) with 0.4mm pitch. This ultra-compact package eliminates the need for HDI PCBs and supports standard reflow assembly, making it ideal for thin-profile smartphones and portable power banks.
How does the SEL pin configure MAX77857AEWQ+T functionality?
The SEL pin on MAX77857AEWQ+T accepts a single external resistor to AGND, decoding four distinct configurations: I²C slave address (0x48–0x4B), switching current limit threshold (0.99A–8.3A), and internal/external feedback resistor selection. This enables hardware-based setup without I²C initialization.
What protection features are integrated into MAX77857AEWQ+T?
The MAX77857AEWQ+T integrates undervoltage lockout (2.4V ±0.1V), overcurrent protection (peak and valley sensing), overvoltage protection (16.4V typical), thermal shutdown (150°C with 20°C hysteresis), and output active discharge (5mA). All protections trigger fault interrupts via the POKB/INTB pin and require no external components.
MAX77857AEWQ+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 31-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:
- 31-WLP (2.83x2.03)
MAX77857AEWQ+T FAQ
1.How can I place an order for MAX77857AEWQ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77857AEWQ+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 MAX77857AEWQ+T reliable?
The price and inventory of MAX77857AEWQ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77857AEWQ+T is usually 5 days.
3.What payment methods are accepted for MAX77857AEWQ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77857AEWQ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77857AEWQ+T?
MAX77857AEWQ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77857AEWQ+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 MAX77857AEWQ+T?
For technical support, including MAX77857AEWQ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77857AEWQ+T requirements.
6.How does Aetrix verify that MAX77857AEWQ+T is sourced from the original manufacturer or authorized distributors?
All MAX77857AEWQ+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 MAX77857AEWQ+T meets industry standards.
7.What is the process for return or replacement of MAX77857AEWQ+T?
All MAX77857AEWQ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77857AEWQ+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 MAX77857AEWQ+T part is unused and in its original packaging.
Return procedure for MAX77857AEWQ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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