MAXREFDES1210: 96W, 12V two-phase SEPIC using MAX16990

The MAX16990 is a high-performance, current-mode, pulse-width mode (PWM) controller with 4μA (typ) shutdown current for wide input-voltage range boost converters/single-ended primary-inductor converters (SEPIC). The 4.5V to 36V input operating voltage range makes this device ideal in automotive applications such as front-end preboost or SEPIC power supplies, and for the first boost stage in high-power LED lighting applications. An internal low-dropout (LDO) regulator (PVL) with a 5V output voltage enables the MAX16990 to operate directly from an automotive battery input. The input operating range can be extended to as low as 2.5V when the converter output is applied to the SUP input.

There are multiple versions of the device offering one or more of the following functions: a synchronization output (SYNCO) for two-phase operations, an overvoltage protection function using a separate input pin (OVP), and a reference input pin (REFIN) to allow on-the-fly output voltage adjustment. All versions can be synchronized to an external master clock using the FSET/SYNC input.

The MAX16990 also has a factory-programmable, spread-spectrum option. The device is available in compact 12-pin TQFN and 10-pin μMAX® packages.
Key Features

Space-Efficient Solution Design with Minimized External Components
100kHz to 1MHz Switching-Frequency Ranges
12-Pin TQFN (3mm x 3mm) and 10-Pin μMAX Packages
Spread Spectrum Simplifies EMI Management Design
Flexibility with Available Configurations for Boost, SEPIC, and Multiphase Applications
Adjustable Slope Compensation
Current-Mode Control
Internal Soft-Start (9ms)
Protection Features Support Robust Automotive Applications
Operating Voltage Range down to 4.5V (2.5V or Lower in Bootstrapped Mode), Immune to Load- Dump Transient Voltages up to 42V
PGOOD Output and Hiccup Mode for Enhanced System Protection
Overtemperature Shutdown
-40°C to +125°C Operation

MAXREFDES1210 - 96W, 12V Two-Phase SEPIC Using the MAX16990