MAX15569 PWM controller, serial I2C interface

The MAX15569 step-down controller consists of a multiphase regulator. The multiphase CPU regulator uses Maxim's unique 2-phase QuickTune-PWM constant "on-time" architecture. The two-phase CPU regulator runs 180° out of phase for true interleaved operation, minimizing input capacitance.

The device's VR control writes the appropriate data into a function-mapped register file. Dynamic changes in output voltage are fast via a 2-wire I²C interface (clock, data), allowing the switching regulator to be programmed to accommodate different voltages. A slew rate controller allows for controlled voltage transitions and controlled soft-start. The regulator operates on a unique intelligent, low-power pulse-skipping algorithm for efficiency and best transient response over the entire load range, compared to common pulse-skipping methods.

The device includes multiple fault protection functions: output overvoltage protection (OVP), undervoltage protection (UVP), and thermal protection. When these fault protection functions detect a fault condition, the controller shuts down. The multi-function active-low INT output monitors the output voltage, overcurrent (OC), overrange (VOUTMAX), and thermal fault (active-low VRHOT).

The controller features a programmable switching frequency, allowing operation from 300kHz to 1400kHz per phase. The controller works with a wide variety of drivers and MOSFETs, such as the MAX15492 MOSFET driver with standard MOSFETs, or with the power stage driver and MOSFET integrated in a single device.

Key Features

2-Phase QuickTune-PWM CPU Core Voltage Regulator

Transient phase overlap reduces output capacitance

I²C serial interface control

Output voltage control

System Status Register

Current Monitor Register

Multi-function output low level effective INT

Overcurrent, output voltage overrange, overvoltage, undervoltage and thermal fault protection

±5mV FB Accuracy at Line and Load

7-bit DAC (0.5V to 1.6V, 10mV/LSB)

True differential remote output sensing

Active load line with adjustable gain

Precise current balancing and current limiting

4.5V to 24V Battery Input Voltage Range

Programmable 300kHz to 1400kHz Switching Frequency

Programmable slew rate and soft-start

chart

Typical Application Circuit (with MAX15492 Driver and MOSFET)