3A, 2.2MHz, Synchronous Step-Down DC-DC Converter

Compact 3A Automotive DC-DC Solution with EMI Reduction Features

Description

The MAX16961 is a high-efficiency, synchronous step-down converter that operates with a 2.7V to 5.5V input voltage range and provides a 0.8V to 3.6V output voltage range. The wide input/output voltage range and the ability to provide up to 3A to load current make this device ideal for on-board point-of-load and post-regulation applications. The device achieves -3.7%/+2.6% output error over load, line, and temperature ranges.

The device features a 2.2MHz fixed-frequency PWM mode for better noise immunity and load transient response, and a pulse-frequency modulation mode (skip) for increased efficiency during light-load operation. The 2.2MHz frequency operation allows for the use of all-ceramic capacitors and minimizes external components. The optional spread-spectrum frequency modulation minimizes radiated electromagnetic emissions.

Integrated low R_DSON switches improve efficiency at heavy loads and make the layout a much simpler task with respect to discrete solutions.

The device is offered with factory-preset output voltages or with an adjustable output voltage. (See the Selector Guide in the full data sheet for options). Factory-preset output-voltage versions allow customers to achieve -3.7%/+2.6% output-voltage accuracy without using external resistors, while the adjustable output-voltage version provides the flexibility to set the output voltage to any desired value between 0.8V to 3.6V using an external resistive divider.

Additional features include 8ms soft-start, 16ms power-good output delay, overcurrent, and overtemperature protections.

The MAX16961 is available in thermally enhanced 16-pin TSSOP-EP and 16-pin (4mm x 4mm) TQFN-EP packages, and is specified for operation over the -40°C to +125°C automotive temperature range.

Key Features

Small External Components
- 2.2MHz Operating Frequency
Ideal for Point-of-Load Applications
- 3A Maximum Load Current
- Adjustable Output Voltage: 0.8V to 3.6V
- 2.7V to 5.5V Operating Supply Voltage
High Efficiency at Light Load
- 26µA Skip Mode Quiescent Current
Minimizes Electromagnetic Interference
- Programmable SYNC I/O Pin
- Operates Above AM-Radio Band
- Available Spread Spectrum
Low Power Mode Saves Energy
- 1µA Shutdown Current
Open-Drain Power-Good Output
Limits Inrush Current During Startup
- Soft-Start
Overtemperature and Short-Circuit Protections
16-Pin TSSOP-EP and 16-Pin (4mm x 4mm) TQFN-EP Packages
-40°C to 125°C Operating Temperature Range

MAX31180

Spread-Spectrum Crystal Multiplier

Ideal for Applications Requiring a Clock with a Precise Center Frequency, Yet Need to Modulate Frequency to Reduce EMI at the Center Frequency and Its Harmonics

Description

The MAX31180 is a low-jitter, crystal-based clock generator with an integrated phase-locked loop (PLL) to generate spread-spectrum clock outputs from 16MHz to 134MHz. The device is pin-programmable to select the clock multiplier rate as well as the dither magnitude. The MAX31180 has a spread-spectrum disable mode and a power-down mode to conserve power.

Key Features

Generates Spread-Spectrum Clocks from 16MHz to 134MHz
Selectable Clock Multiplier Rates of 1x, 2x, and 4x
Center Spread-Spectrum Dithering
Selectable Spread-Spectrum Modulation Magnitudes of ±0.5%, ±1.0%, and ±1.5%
Spread-Spectrum Disable Mode
Low Cycle-to-Cycle Jitter
Power-Down Mode with High-Impedance Output
Low Power Consumption
3.0V to 3.6V Single Supply Operation
-40°C to +125°C Temperature Operation
Small 8-Lead µSOP Package