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Analog Devices Inc./Maxim Integrated MAX77857CEFE+T
- Part No.:
- MAX77857CEFE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-PowerUFQFN
- Datasheet:
-
MAX77857CEFE+T.pdf
- Description:
- IC REG BUCK BST PROG/3V 16FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,738
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Product details
Overview
MAX77857CEFE+T from Analog Devices is a high-efficiency, I²C-programmable buck-boost converter designed for wide-input power management in portable and USB-PD systems. It supports 2.5V–16V input, delivers up to 6A in buck mode and 4A in boost mode (boost ratio ≤1.3), features 7A switching current capability, and provides dynamic output voltage scaling (DVS) from 4.5V–15V using internal feedback or 3V–15V with external resistors - enabling use in notebook computers, DSLR lens power, and dual-role USB VBUS supplies.
For engineers reviewing the MAX77857CEFE+T datasheet, MAX77857CEFE+T pinout, MAX77857CEFE+T application, or MAX77857CEFE+T equivalent, this page delivers verified electrical parameters, validated WLP/FC2QFN package mapping, confirmed I²C-configurable slew rate and current limit thresholds, and real-world USB PD OTG and Qualcomm Quick Charge™ implementation context - all extracted from the official Analog Devices MAX77857 Rev 3 datasheet.
Technical Context
The MAX77857CEFE+T implements a synchronous four-switch buck-boost topology with integrated high-side and low-side MOSFETs (RDSON_HS = 20–35 mΩ, RDSON_LS = 22–43 mΩ), supporting seamless transition between buck and boost operation across its 2.5V–16V input range. Its control architecture combines PWM regulation with automatic SKIP mode for light-load efficiency and optional forced-PWM (FPWM) mode via I²C.
It integrates dual bootstrap drivers (BST1/BST2), an internal 1.8V VL regulator, and a dedicated VIO supply domain (1.08V–2.0V) for I²C interface logic. The SEL pin decodes resistor values to configure slave address, current limit threshold, and feedback selection - while I²C commands override these settings for runtime reconfiguration of output voltage, switching frequency (1.1–2.27 MHz), and slew rate (1/6–7/6 mV/µs).
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 USB PD input rails without pre-regulation. |
| Output Current Capability | Buck mode: up to 6A continuous; Boost mode: up to 4A (boost ratio ≤1.3) - enables high-power USB VBUS delivery and display panel biasing. |
| Switching Current Limit | Programmable from 0.99A to 8.3A via I²C or RSEL - allows optimization of inductor size and thermal design per application. |
| Output Voltage Range | 4.5V–15V (internal FB) or 3V–15V (external FB); adjustable in 73.5mV steps - supports dynamic voltage scaling for SoC power domains. |
| Switching Frequency | 1.10–2.27 MHz (4 programmable bands) - enables compact magnetics and EMI tuning around sensitive frequency bands. |
| Protection Features | UVLO (2.4V typ), OVP (16.4V typ), OCP, thermal shutdown (150°C), and output active discharge - ensures robust operation in unregulated battery systems. |
| I²C Interface | Fast-mode (400kHz), Fast-mode Plus (1MHz), and High-speed mode (3.4MHz) support - enables real-time DVS and fault monitoring in host-controlled systems. |
Pinout & Package
MAX77857CEFE+T is available in a 3.5mm × 3.5mm, 16-lead Flip Chip QFN (FC2QFN) package (Package Code F163A3F+1), optimized for high-density portable PCB layouts and compatible with standard reflow processes. Thermal resistance θJA = 48.3°C/W on a four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Main input supply (2.5V–16V); requires dual 10μF ceramic bypassing close to pins 13 and 13 (redundant layout). |
| OUT | Power Output | Regulated buck-boost output; requires dual 22μF ceramic capacitors at point-of-load for stability and ripple suppression. |
| LX1 / LX2 | Switching Nodes | Internal high-side/low-side FET connection points; must be routed with minimal loop area to reduce EMI and switching losses. |
| BST1 / BST2 | Bootstrap Supplies | Drive high-side FET gates; each requires 0.22μF/25V ceramic capacitor tied directly to respective LX pin. |
| FB | Voltage Feedback | Sense node for output regulation; connects to output (internal FB) or center-tap of external resistor divider (external FB). |
| SEL | Configuration Input | Analog input that sets I²C address, current limit, and FB selection via single external resistor to AGND. |
| SCL / SDA | I²C Interface | Open-drain digital interface (1.08V–2.0V VIO domain); require 1.5kΩ–2.2kΩ pull-ups to VIO. |
| VIO | Interface Supply | Digital logic supply (1.08V–2.0V); holds registers in reset if below 0.955V; bypassed with 0.47μF/6.3V ceramic. |
| EN | Enable Input | Active-high enable (0.9V threshold); internally pulldown biased; compatible with VIO domain for direct microcontroller control. |
| PGND / AGND | Ground Returns | Separate power and analog grounds; must be connected on PCB with low-inductance path per layout guidelines. |
| POKB/INTB | Status/Interrupt | Open-drain output indicating POK status or fault condition (MAX77857B/C variant only - confirmed for CEFE+T). |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range Operation | 2.5V–16V input accommodates 1S–3S Li-ion batteries and USB PD sources without external pre-regulators. |
| Dual-Mode Buck-Boost Topology | Seamless transition between buck and boost modes eliminates output discontinuity during input voltage crossing VOUT. |
| I²C-Programmable DVS | Output voltage adjustable in 73.5mV steps from 4.5V–15V (internal FB) or 3V–15V (external FB) for dynamic SoC power management. |
| Configurable Switching Frequency | Four selectable frequencies (1.1–2.27 MHz) allow EMI optimization and inductor size reduction in space-constrained designs. |
| Integrated Protection Suite | Includes UVLO, OVP (16.4V typ), OCP, thermal shutdown (150°C), and active output discharge - reduces external protection components. |
| RSEL Hardware Configuration | Single resistor on SEL pin sets I²C address, current limit, and FB selection - simplifies bring-up without firmware dependency. |
Applications
| USB Power Delivery (USB-PD) OTG | Qualcomm® Quick Charge™ |
|---|---|
Use Scenario: Portable device acting as USB-PD power source to charge smartphones or accessories. IC Role / Device Role / Timing Role: Primary buck-boost regulator generating stable 5V–15V VBUS from battery input with dynamic voltage negotiation. Use Value: Enables full USB-PD specification compliance including Programmable Power Supply (PPS) support via I²C-controlled DVS and fast transient response. |
Use Scenario: Fast-charging smartphone or tablet requiring adaptive voltage scaling up to 12V/3A. IC Role / Device Role / Timing Role: System power rail generator delivering QC-compatible voltages with sub-millisecond DVS ramp control. Use Value: Reduces charging time by maintaining optimal voltage/current profiles across battery SOC, leveraging 4.5V–15V I²C-programmable output range. |
| DSLR Lens Power Supply | Notebook Computer Main Rail |
Use Scenario: Compact interchangeable lens requiring regulated 5V–12V for focus motors, image stabilization, and communication ICs. IC Role / Device Role / Timing Role: High-density, low-profile power converter operating from 7.4V–11.1V battery packs with minimal solution footprint. Use Value: Achieves <9.0mm × 4.1mm total solution size using 1.5μH inductor and 0402/0603 passives - critical for lens barrel integration. |
Use Scenario: Main system rail (e.g., 5V or 12V) in ultrabook or 2-in-1 convertible powered from 3S Li-ion battery. IC Role / Device Role / Timing Role: Primary system power converter supporting wide input swing during battery discharge and AC adapter transitions. Use Value: Eliminates need for separate buck and boost converters; maintains regulation down to 2.5V input, extending usable battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77854AEFE+T | Lower max output current (3A buck / 2A boost), no POK/INTB pin, fixed 5V default output, same FC2QFN package. | Suitable for lower-power USB peripherals or auxiliary rails where full 6A capability is unnecessary. | Select when cost sensitivity outweighs need for dynamic DVS, higher current, or fault interrupt signaling. |
| TPS63802DLAR | 3.6V–13.2V input, 4A max output, no I²C interface, fixed-frequency PWM only, 2.5mm × 3.0mm QFN package. | Targeted at space-constrained industrial sensors or wearables needing simple, non-configurable buck-boost conversion. | Choose when firmware-free operation, smaller footprint, and absence of digital control are prioritized over programmability and USB-PD flexibility. |
Compared with MAX77857CEFE+T, MAX77854AEFE+T offers reduced current capability and no POK/INTB functionality but shares pinout and basic configuration; TPS63802DLAR eliminates I²C entirely and trades configurability for minimal size and BOM count - making MAX77857CEFE+T the only option supporting full USB PD OTG, Qualcomm QC, and dynamic voltage scaling in a single IC.
Availability
MAX77857CEFE+T is available at Aetrix Electronics and suitable for USB PD OTG implementations, Qualcomm Quick Charge™ reference designs, and notebook computer main rail power conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX77857CEFE+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 precision instrumentation, industrial automation, communications, and automotive markets.
The MAX77857 belongs to Analog Devices' power management IC portfolio targeting high-efficiency, digitally configurable DC-DC conversion for portable and USB-powered systems - specifically engineered for USB PD, Quick Charge, and multi-cell battery applications demanding wide VIN and dynamic voltage control.
FAQ
What is the maximum output current supported by the MAX77857CEFE+T in buck mode?
The MAX77857CEFE+T supports up to 6A of continuous output current in buck mode, subject to thermal limits - junction temperature must remain ≤+105°C for sustained 6A operation. Derating applies above this temperature, and actual achievable current depends on PCB layout, airflow, and ambient conditions. The IC's 7A typical switching current rating ensures headroom for peak loads and transient response.
Does the MAX77857CEFE+T support USB Power Delivery (USB-PD) compliance out of the box?
The MAX77857CEFE+T itself is not a USB-PD controller but is fully compatible with USB-PD implementations as the primary power stage. Its 2.5V–16V input range, 4.5V–15V I²C-programmable output, fast DVS ramp control, and POK/INTB fault signaling enable seamless integration with dedicated PD controllers (e.g., CYPD3177) to meet USB-PD 3.0 and PPS requirements.
What package type does the MAX77857CEFE+T use, and is it RoHS-compliant?
The MAX77857CEFE+T uses a 3.5mm × 3.5mm, 16-lead Flip Chip QFN (FC2QFN) package (Outline Number 21-100410, Package Code F163A3F+1). The "+" suffix in the package code indicates RoHS-compliant, lead-free finish. Thermal resistance θJA is 48.3°C/W on a standard four-layer board.
Can the MAX77857CEFE+T operate without an I²C interface?
Yes - the MAX77857CEFE+T supports standalone operation using the SEL pin to configure default output voltage (via internal or external feedback), switching current limit, and I²C slave address. VIO may be omitted if I²C is unused, though it must be valid (≥0.955V) for register access. All core regulation functions remain fully operational without I²C.
What protection features are integrated into the MAX77857CEFE+T?
The MAX77857CEFE+T integrates undervoltage lockout (UVLO at 2.4V typ), overvoltage protection (OVP at 16.4V typ), cycle-by-cycle overcurrent protection (OCP), thermal shutdown (150°C), and output active discharge. These features operate independently of I²C control and ensure safe operation under fault conditions such as short-circuit, overtemperature, or input surge.
MAX77857CEFE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-PowerUFQFN
- 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:
- 16-FC2QFN (3.5x3.5)
MAX77857CEFE+T FAQ
1.How can I place an order for MAX77857CEFE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77857CEFE+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 MAX77857CEFE+T reliable?
The price and inventory of MAX77857CEFE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77857CEFE+T is usually 5 days.
3.What payment methods are accepted for MAX77857CEFE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77857CEFE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77857CEFE+T?
MAX77857CEFE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77857CEFE+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 MAX77857CEFE+T?
For technical support, including MAX77857CEFE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77857CEFE+T requirements.
6.How does Aetrix verify that MAX77857CEFE+T is sourced from the original manufacturer or authorized distributors?
All MAX77857CEFE+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 MAX77857CEFE+T meets industry standards.
7.What is the process for return or replacement of MAX77857CEFE+T?
All MAX77857CEFE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77857CEFE+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 MAX77857CEFE+T part is unused and in its original packaging.
Return procedure for MAX77857CEFE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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