Analog Devices / Maxim Integrated MAX77857 Buck-Boost Converters

Analog Devices MAX77857 Buck-Boost Converters are high-efficiency, high-performance converters targeted for systems requiring a 2.5V to 16V wide input voltage range. The MAX77857 Buck-Boost Converters feature a 7A switching current and can supply up to 6A output current in buck mode and up to 4A in boost mode. The buck-boost converters operate in PWM mode and implement an automatic SKIP mode to improve light-load efficiency. These Analog Devices devices are available in a 2.83mm x 2.03mm, 35-bump, and 31-bump Wafer-Level Package (WLP), and a 3.5mm x 3.5mm, 16-lead Flip Chip QFN (FC2QFN) package. Typical applications include USB power delivery OTG, Qualcomm^® quick charge™, USB VBUS supply, DRP ports, DSLR, display power, up to 3-cell Li-Ion battery applications, etc.

Features

2.5V to 16V wide input voltage range
Default output voltage
- 5V with internal feedback resistors
- 3V to 15V with external feedback resistors
I²C-programmable output voltage after startup
- 4.5V to 15V with internal feedback resistors
- 3.0V to 15V with external feedback resistors
Maximum output current
- Up to 6A buck mode
- Up to 4A boost mode (Boost Ratio ≤ 1.3)
7A Typical switching current
R_SEL configuration
- I²C interface slave address
- Switching current limit threshold
- Internal/external feedback resistors
I²C programming
- Output voltage (DVS)
- Slew rate of output voltage change
- Switching current limit threshold
- Switching frequency
- Forced PWM mode operation (FPWM)
- Power-OK (POK) status and fault interrupt masks

Soft-start
Output active discharge
Open-Drain Power-OK (POK) monitor and fault condition interrupt (MAX77857B/C Only)
Protection Features
- Undervoltage Lockout (UVLO)
- Overcurrent Protection (OCP)
- Overvoltage Protection (OVP)
- Thermal Shutdown (THS)
High-Density Interconnect (HDI) PCB is not required
-40°C to 85°C operating temperature range
WLP-35, WLP-31, and FC2QFN-16 package options

Applications

USB Power Delivery (USB-PD) OTG
Qualcomm^® quick charge™
USB VBUS supply and DRP (Dual Role Power) ports
DSLR and DSLR lens

Display power
Up to 3-cell Li-Ion battery applications
Notebooks, computers, and tablet PCs

Analog Devices / Maxim Integrated MAX77857 Buck-Boost Converters

Features

Applications

Block Diagram

Application Circuit Diagram

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