General Description
The MAX77542 is a high-efficiency step-down converter
with four 4A switching phases. It uses an adaptive constant
on-time (COT) current-mode control scheme and its
flexible architecture supports five phase configurations. Its
wide input-voltage range enables a direct conversion for
less than 1V outputs from 1 to 3-cell Li+ batteries and USB
power delivery (PD) supply rails. The output voltages are
preset with resistors and are further adjustable through an
I2C-compatible interface.
Flexible sequencer and programmable soft-start/soft-stop
slew rates provide controlled transitions between operating
states. Programmable switching frequency, frequency
tracking, and spread-spectrum features allow easier
system optimization for noise-sensitive applications. Multifunction
I/Os allow for flexible control of each output for
EN, LPM, FPWM, POK, RSTINB, and RSTOB status. An
array of built-in protections ensures safe operation under
abnormal operating conditions.

Benefits and Features
● 2.8V to 16V Input-Voltage Range
● 0.3V to 5.2V Output-Voltage Range
● Max 16A (4A/Φ) with Five Phase Configurations
● ±0.5% VOUT Accuracy (Default VOUT at +25°C)
● 94% Peak Efficiency (7.6VIN, 3.3VOUT, 1MHz)
● Auto Skip/PWM Transition and Low-Power Mode
● Drop-Out Operation with 98% of Max Duty Cycle
● Differential Output-Voltage Sensing
● Flexible Sequencer with Soft-Start/Soft-Stop Slew
Rates
● Prebiased Startup and Active Output Discharge
● 0.5MHz/1.0MHz/1.5MHz Nominal Switching
Frequency
● Spread-Spectrum Modulation for EMI Reduction
● Internal/External Frequency Tracking
● Default VOUT and Phase Configuration Setting by
RSELx
● Multifunction I/Os for EN, LPM, FPWM, and POK
● UVLO, Thermal-Shutdown, and Short-Circuit
Protection
● High-Speed, I2C Serial Interface
● Available in 60-Bump WLP (4.36mm x 2.56mm x
0.65mm)
● Less than 115mm2 Total Solution Size with 2520
Inductors

Applications
● 1 to 3-Cell Li+ and USB-C Power Delivery Systems
● Audio/Video Equipment and PCIe/RAID Cards
● Application Processors, FPGAs, DSPs, and ASICs