MAX8967

Dual Step-Down Converters with 6 LDOs for Baseband and Applications Processor

Achieve Smaller Component Size and Board Area with This Integrated Solution

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Overview

Multi-Output PMIC in a Compact Package
- Two 2A Step-Down Converters with Remote Output Voltage Sensing
- Two 300mA LDOs
- Four 150mA LDOs
- < 1µA Shutdown Current
- 2.32mm x 2.44mm Package
Versatile Step-Down Converters
- Programmable Output Voltage (0.6V to 3.3875V) Through I²C Bus
- Programmable Output Voltage Slew Rate (12.5mV/µs to 50mV/µs)
- Dynamic Switching Between Two Output Voltages Through V_{ID_} Pins
Efficient Step-Down Converters
- Over 95% Efficiency with Internal Synchronous Rectifier
- Automatic Skip Mode at Light Loads
- Low 61µA (typ) Quiescent Current
- 5µA (typ) Green Mode per Step-Down Converter
Programmable LDOs
- Programmable Output Voltage (0.8V to 3.95V in 50mV Steps)
- Programmable Soft-Start Slew Rate (5mV/µs–100mV/µs)
Reduces Component Size and Board Area Solution
- 4.4MHz Step-Down Switching Allows for 1µH Inductors
- C_OUT = 1µF for All LDOs
- Reduced Board Space with Remote Capacitor LDOs
- Internal Feedback for Step-Down Converters and LDOs

The MAX8967 is an µPMIC with two DC-to-DC step-down switching converters and six remote capacitor-capable LDOs. The step-down converters deliver up to 2A of output current independently. Two of the LDOs deliver a load current up to 300mA, while the remaining four deliver up to 150mA. Both step-down converters have remote sense, allowing loads to be placed away from the IC. The IC operates over a 2.6V to 5.5V input supply range.

Fixed-frequency 4.4MHz PWM operation and clocks that are 180° out of phase permit the use of small external components. Under light load conditions, the step-down converters automatically switch to skip mode operation. In skip mode operation, switching occurs only as needed, allowing efficient operation. Placing either of the step-down converters into green mode reduces the quiescent current consumption of that converter to 5µA (typ).

The IC supports dynamic adjustment of the output voltage through its I²C interface. Each step-down converter has two register settings for output voltage and a setting for ramp rate. Also, each step-down converter has a dedicated enable pin and a dedicated V_ID pin to toggle between the two programmed output voltages. Additionally, an interrupt output is provided, allowing the IC to signal its master.

Applications