Analog Devices / Maxim Integrated MAX77533 High-Efficiency Buck Regulator

Analog Devices MAX77533 High-Efficiency Buck Regulator is a synchronous 1.5A step-down DC-DC converter optimized for portable 2-cell and 3-cell battery-operated and USB-C applications. The MAX77533 operates on an input supply between 3V and 14V. The output voltage of the MAX77533 is adjustable between 0.8V and 5.0V in 50mV steps. Factory-programmed default voltages of 1.2V, 1.8V, and 3.3V are offered to reduce component count for common rails. This device features a low-I_Q SKIP mode, which allows excellent efficiency at light loads.

Dedicated Enable and Power-OK (POK) pins allow simple hardware control. An I²C serial interface is optionally used for full configuration and control for dynamic voltage scaling and system power optimization.

Built-in undervoltage lockout (UVLO), output active discharge, cycle-by-cycle current limit, thermal shutdown, and short-circuit protection ensure safe operation under abnormal operating conditions.

The Analog Devices MAX77533 Buck Regulator is offered in a 12-bump, 0.4mm pitch Wafer-Level Package (WLP).

Features

5A single-channel buck regulator
3V to 14V input voltage range
8V to 99%V_SUP output voltage range
- 8V to 5V I²C programmable in 50mV Steps
- 55V to 99%V_SUP with external feedback resistors
- 2V, 1.8V, or 3.3V factory preset options
High-efficiency, low-I_Q extends battery life
- 94% peak efficiency at 7.4V_SUP, 3.3V_OUT (2520 inductor)
- 9μA IQ (12V_SUP, 1.8V_OUT internal feedback version)
- Selectable light-load SKIP and Forced-PWM modes
1MHz or 550kHz fixed-frequency switching

Hardware or software control
- Enable input and Power-OK output pins
- Optional I²C full control interface
Protection features
- Cycle-by-cycle inductor peak current limit
- Short-circuit hiccup mode, UVLO, and thermal shutdown protection
- 1ms default soft-start
Physical characteristics
- 40°C to +85°C operating temperature range
- 85mm x 1.4mm x 0.7mm WLP12, 0.4mm pitch, 3 x 4 array
- RoHS compliant

Applications

2-cell and 3-cell high power density supplies
Portable Li+/Li-ion battery-powered devices

Drones, HD cameras, and notebook computers
Space-constrained portable electronics

Analog Devices / Maxim Integrated MAX77533 High-Efficiency Buck Regulator

Features

Applications

Buck Control Scheme

Application Circuit (External Feedback)

Application Circuit (Internal Feedback)

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