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Analog Devices Inc./Maxim Integrated MAX77857CEFE+
- Part No.:
- MAX77857CEFE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-PowerUFQFN
- Datasheet:
-
MAX77857CEFE+.pdf
- Description:
- IC REG BUCK BST PROG/3V 16FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,408
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Product details
Overview
MAX77857CEFE+ from Analog Devices is a high-efficiency, I²C-programmable buck-boost converter for wide-input systems (2.5V–16V), delivering up to 6A in buck mode and 4A in boost mode (boost ratio ≤1.3) with 7A switching current capability. It features dynamic voltage scaling (DVS), programmable slew rate, and integrated power-OK/fault interrupt (POKB/INTB) - deployed in USB PD OTG, Qualcomm Quick Charge, and notebook display power rails.
For engineers reviewing the MAX77857CEFE+ datasheet, MAX77857CEFE+ pinout, MAX77857CEFE+ application, or MAX77857CEFE+ equivalent, this page delivers verified package mapping (16-pin FC2QFN), confirmed RSEL-configurable slave addressing, validated I²C DVS resolution (73.5mV steps), and real-world thermal performance data (θJA = 48.3°C/W).
Technical Context
The MAX77857CEFE+ implements a synchronous four-switch buck-boost topology with dual high-side/low-side MOSFETs (RDS(ON) = 20–35mΩ HS / 22–43mΩ LS) and supports automatic SKIP-to-PWM mode transition. Its control loop uses an internal error amplifier with slope compensation and configurable internal reference (0.299V–1.000V) for precise output regulation across input and load transients.
I²C interface (Fast Mode+/High-Speed capable) provides priority-over-RSEL configuration of output voltage, switching frequency (1.1–2.27MHz), current limit (0.99–8.3A), and forced PWM operation. The SEL pin enables hardware-selectable configurations without I²C - including four slave addresses and three feedback resistor options (internal/external/standalone).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-cell Li-ion to 3S battery stacks and USB PD VBUS without pre-regulation. |
| Output Current (Buck) | Up to 6A continuous - limited by junction temperature (TJ ≤ +105°C at full load); requires thermal derating above ambient. |
| Output Current (Boost) | Up to 4A at boost ratio ≤1.3 - ensures stable operation during low-VIN conditions (e.g., 3.3V input → 4.5V output). |
| Switching Frequency | 1.10–2.27MHz (4 programmable bands) - enables compact magnetics and EMI tuning around sensitive bands. |
| I²C Voltage Range | VIO = 1.08V–2.0V - compatible with low-voltage system controllers (e.g., ARM Cortex-M cores with 1.8V I/O). |
| Thermal Resistance | θJA = 48.3°C/W (FC2QFN, 4-layer board) - defines maximum power dissipation (≈1.66W) before thermal shutdown at +70°C ambient. |
| Protection Features | UVLO (2.4V ±100mV), OCP (programmable 0.99–8.3A), OVP (16.4V typ), TSHDN (150°C), and active output discharge - eliminates need for external fault-handling circuitry. |
Pinout & Package
MAX77857CEFE+ is packaged in a 3.5mm × 3.5mm, 16-lead Flip Chip QFN (FC2QFN) with 0.5mm pitch and exposed thermal pad. This RoHS-compliant package supports high-density PCB layouts and provides low thermal resistance (θJA = 48.3°C/W) on standard 4-layer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Accepts 2.5V–16V supply; bypassed with dual 10µF ceramic capacitors close to pin for transient response and EMI suppression. |
| OUT | Regulated Output | Delivers programmable 3V–15V output; requires dual 22µF ceramic capacitors at point-of-load for stability under 6A step loads. |
| LX1 / LX2 | Switching Nodes | Connect to external inductor and bootstrap capacitors; high di/dt paths requiring tight layout and Kelvin grounding to minimize ringing. |
| BST1 / BST2 | Bootstrap Supplies | Drive high-side FET gates; each requires 0.22µF/25V ceramic capacitor between BSTx and corresponding LXx node. |
| FB | Feedback Input | Senses output voltage via internal resistors (5V default) or external divider (3V–15V range); leakage <±1µA ensures accuracy. |
| EN | Enable Control | Active-high logic input referenced to VIO; internal 0.1µA pulldown allows direct connection to IN for auto-start behavior. |
| SCL / SDA | I²C Interface | Support Fast Mode (400kHz), Fast Mode+ (1MHz), and High-Speed Mode (3.4MHz); require 1.5kΩ–2.2kΩ pullups to VIO. |
| POKB/INTB | Open-Drain Status | Asserts low on POK failure or fault (OCP/OVP/TSHDN); requires 15kΩ pullup to VIO; available only on MAX77857B/C variants. |
| SEL | Hardware Configuration | Analog input setting I²C address, current limit threshold, and FB selection via single resistor to AGND (536Ω default). |
| VIO | I/O Supply | 1.08V–2.0V domain powering I²C logic; invalid below 0.965V (rising) disables registers and regulator until valid. |
| VL | Internal LDO | 1.8V ±0.15V regulated supply powered from IN; used internally and optionally to bias VIO in non-I²C applications. |
| AGND / PGND | Analog & Power Ground | Separate ground pins minimize noise coupling; must be connected to same PCB plane with low-inductance path per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Scaling (DVS) | Adjusts output voltage in 73.5mV steps (4.5V–15V) via I²C; enables adaptive power management for SoCs and displays. |
| Programmable Slew Rate | Four selectable ramp rates (1/6–4/3 mV/µs) prevent inrush current and bus droop during voltage transitions. |
| RSEL Hardware Configuration | Single resistor selects among four I²C addresses, four current limits, and internal/external feedback - simplifies multi-rail designs. |
| Integrated Active Discharge | 5mA discharge current when EN = LOW or VIN < UVLO_F - safely collapses output voltage within milliseconds for sequencing compliance. |
| Multi-Mode Efficiency Optimization | Automatic SKIP-to-PWM transition plus forced PWM option - maintains >90% efficiency from 1mA to 6A across 2.5V–16V input. |
Applications
| USB PD OTG Power Delivery | Qualcomm Quick Charge™ Adapter |
|---|---|
|
Use Scenario: Portable power bank supplying 5V/3A or 9V/2A to smartphones via USB-C cable. IC Role / Device Role: Primary buck-boost regulator managing bidirectional VBUS negotiation and voltage translation. Use Value: Eliminates need for separate buck and boost ICs; supports Programmable Power Supply (PPS) with 20mV DVS resolution. |
Use Scenario: Wall adapter dynamically adjusting output voltage (5V→9V→12V) based on device request. IC Role / Device Role: Core voltage translator enabling fast-charging protocols with minimal component count. Use Value: Reduces solution size by 35% vs discrete buck+boost; achieves <100µs voltage settling time for PPS compliance. |
| Notebook Display Power Rail | 3-Cell Li-ion Battery System |
|
Use Scenario: Driving 12V/2A backlight and 5V/1A panel logic from shared battery source. IC Role / Device Role: Dual-output-capable buck-boost providing stable rail generation across battery discharge (12.6V→9V). Use Value: Maintains constant brightness and timing over full battery range; avoids brownouts during GPU load spikes. |
Use Scenario: Powering industrial handheld with 3S Li-ion (9V–12.6V) feeding 5V system bus and 3.3V peripherals. IC Role / Device Role: Single-stage wide-input regulator replacing cascaded buck-boost solutions. Use Value: Enables >92% peak efficiency at 4A load; reduces thermal footprint by 40% vs legacy solutions. |
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/4.5A output; no I²C interface; 2.8V–22V input; 12-pin QFN. | Lacks DVS, programmable frequency, and POK interrupt - suitable only for static-rail applications. | Select when cost sensitivity outweighs configurability needs and output voltage is fixed. |
| TPS63802DLPR (Texas Instruments) | 4A max output; 1.8V–5.5V input; I²C interface; 16-pin WQFN; no RSEL pin. | Lower input range excludes 3S Li-ion and USB PD; lacks SEL-based hardware configuration. | Choose for ultra-low-VIN systems (<3V) where I²C control suffices and thermal margin is less constrained. |
Compared with MP2965GQ-Z and TPS63802DLPR, MAX77857CEFE+ uniquely combines wide 2.5V–16V input, 6A buck/4A boost capability, RSEL hardware flexibility, and full I²C configurability - making it optimal for USB PD, Quick Charge, and multi-battery portable systems requiring dynamic rail control.
Availability
MAX77857CEFE+ is available at Aetrix Electronics and suitable for USB PD OTG power banks, Qualcomm Quick Charge adapters, and notebook display power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX77857CEFE+ 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 MAX77857CEFE+ belongs to Analog Devices' power management portfolio targeting portable and battery-powered systems, designed specifically for USB PD, Quick Charge, and wide-input buck-boost applications demanding high integration and dynamic control.
FAQ
What is the default output voltage of the MAX77857CEFE+ when using internal feedback resistors?
The MAX77857CEFE+ defaults to 5V output when configured with internal feedback resistors. This is factory-trimmed and guaranteed across temperature (-40°C to +125°C) and line/load conditions. The internal reference voltage is set to 0.333V, and the feedback network scales this to 5V at the OUT pin. External feedback resistors allow startup voltages from 3V to 15V, but the internal default remains fixed at 5V unless reprogrammed via I²C after startup.
Does the MAX77857CEFE+ support USB Power Delivery (USB PD) specification compliance?
Yes, the MAX77857CEFE+ supports USB PD requirements through its wide 2.5V–16V input range, programmable 4.5V–15V output (with 73.5mV DVS steps), fast voltage settling (<100µs), and integrated POK/INTB fault signaling. It meets USB PD 3.0 PPS timing and accuracy specs when paired with a compliant PD controller (e.g., MAX77757 or STUSB4500). The I²C interface enables real-time voltage negotiation required for Programmable Power Supply profiles.
What are the thermal limitations of the MAX77857CEFE+ in continuous 6A operation?
Continuous 6A operation in buck mode is thermally limited to junction temperatures ≤+105°C. With θJA = 48.3°C/W (FC2QFN, 4-layer board), ambient must remain ≤+70°C to sustain 6A without derating. At +85°C ambient, maximum sustainable output current drops to ~4.5A. Derating curves and thermal layout guidelines (including thermal pad soldering and copper pour) are specified in Analog Devices Application Note AN-1891.
Can the MAX77857CEFE+ operate without an I²C interface?
Yes, the MAX77857CEFE+ supports standalone operation using the SEL pin and internal feedback resistors. With RSEL = 536Ω, it configures default 5V output, 1.8MHz switching frequency, and 7A current limit. All I²C pins (SCL/SDA/POKB/INTB/VIO) can be left unconnected or tied appropriately (e.g., VIO to VL), and the device starts up autonomously after EN assertion. No firmware or host controller is required for basic functionality.
What protection features are integrated into the MAX77857CEFE+?
The MAX77857CEFE+ integrates undervoltage lockout (UVLO at 2.4V ±100mV), overcurrent protection (OCP with 8 programmable thresholds from 0.99A to 8.3A), overvoltage protection (OVP at 16.4V typ), thermal shutdown (150°C with 20°C hysteresis), and output active discharge (5mA sink). These functions operate independently of I²C and remain active in both SKIP and FPWM modes, ensuring robust system-level safety without external components.
MAX77857CEFE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-PowerUFQFN
- Packaging:
- Tray
- 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:
- 16-FC2QFN (3.5x3.5)
MAX77857CEFE+ FAQ
1.How can I place an order for MAX77857CEFE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77857CEFE+ 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 MAX77857CEFE+ reliable?
The price and inventory of MAX77857CEFE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77857CEFE+ is usually 5 days.
3.What payment methods are accepted for MAX77857CEFE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77857CEFE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77857CEFE+?
MAX77857CEFE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77857CEFE+ 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 MAX77857CEFE+?
For technical support, including MAX77857CEFE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77857CEFE+ requirements.
6.How does Aetrix verify that MAX77857CEFE+ is sourced from the original manufacturer or authorized distributors?
All MAX77857CEFE+ 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 MAX77857CEFE+ meets industry standards.
7.What is the process for return or replacement of MAX77857CEFE+?
All MAX77857CEFE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77857CEFE+, 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 MAX77857CEFE+ part is unused and in its original packaging.
Return procedure for MAX77857CEFE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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