For the quad-phase configuration, connect SYNCOUT of the master to FSYNC of the slave. SYNCOUT outputs a clock that is 90В° out-of-phase with the internal oscillator or the external FSYNC input. Connect PWM to GND when using an external resistor-divider to set the output voltage or if PWM is not used. Controls the output voltage, allowing it to track a digital duty cycle (PWM) signal. Bring EN high to enable the MAX25203 and power up into the default state. When EN is low, the MAX25203 is powered off, including BIAS and I2C interface. A resistor-divider can be used to control the turn ON and OFF of the boost controller in hardware by using a resistor-divider. EN also has a very accurate threshold of в“% for both rising and falling voltages. Driving EN low disables the boost controller. SDA SDA High-Voltage Tolerant, Active-High Digital Enable Input for Controller. SUP SUP BATT BATT BATT BATT I2C Clock Input. Connect a resistor to FOSC to set the switching frequency of the DC-DC converters. See the Fixed 5V Linear Regulator (BIAS) section.

BIAS provides the power to the internal circuitry and external loads. Bypass BIAS to GND with a low-ESR ceramic capacitor of 1в™џ minimum value. OUT OUT 5V Internal Linear Regulator Output. FB FB Output Voltage Sense for Internal Feedback Divider. See the Setting and Controlling the Output Voltage section. For external feedback, connect FB to the center tap of a resistor-divider between the boost regulator output. Connect FB to BIAS to use the I2C programmed output voltage or PWM voltage control. COMP COMP Boost Converter Feedback Input. Connect an RC network to COMP to compensate the boost converter. PGND PGND Boost Controller Error Amplifier Output. The exposed pad is attached with epoxy to the substrate of the die, making it an excellent path to remove heat from the IC. Connecting the exposed pad to ground does not remove the requirement for proper ground connections to GND. See the Ordering Information table for the factory-set DRV voltage.

This voltage is used as the gate drive voltage for external MOSFETs. Bypass DRV to GND with a 4.7ОјF or greater ceramic capacitor. PGATE PGATE OPTIONAL OUTPUT DISCONNECT OPTIONAL OUTPUT DISCONNECT 6.5V to 10V Preset Low-Dropout Voltage-Regulator Output. Connect PGATE to the gate of the external p-channel output disconnect switch. OUT OUT External p-Channel MOSFET Gate Connection. Output Voltage Sense for Internal Feedback Divider. It operates over the -40вЊ to +125вЊ automotive temperature range. Protection features include cycle-by-cycle current limit and thermal shutdown. The MAX25203 features a power-OK monitor and undervoltage lockout. Programmable current-limit blanking handles high peak loads without oversizing the inductor. Pass-through operation has over 98% efficiency when the supply voltage exceeds the output regulation voltage. A 90В° out-of-phase clock output enables synchronizing a second MAX25203 for quad-phase operation. The MAX25203 has a spread-spectrum option for frequency modulation to minimize EMI interference. The switching frequency is resistor adjustable (220kHz to 2100kHz) or it can be synchronized on-the-fly to an external clock. The MAX25203 operates at up to 2.1MHz frequency to allow small external components and reduced output ripple, and to guarantee no AM band interference. This device can start with an input voltage supply from 4.5V to 42V and can operate down to 1.8V after start-up, and has a low 5в™љ shutdown supply current. It can also be used to generate backlight voltage and Class D audio amplifier voltages. The MAX25203 automotive dual-phase synchronous boost controller enables infotainment systems to stay in regulation during cold-crank or start-stop operation all the way down to a battery input of 1.8V.

Fet switch