MAX25430 datasheet(21/120 Pages) MAXIM

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up once the voltage on BIAS crosses the undervoltage-lockout (UVLO) rising threshold and shuts down when BIAS falls

below the UVLO falling threshold. Connect a 4.7μF ceramic capacitor from BIAS to GND for proper operation of the linear

regulator. Refer to PCB Layout Guidelines for more information.

External loads, such as an MCU or PD Controller, can be connected to BIAS as a power supply as long as:

● The total BIAS current, including internal circuitry, is below 60mA. Make sure to account for the internal buck-boost

drivers current consumption when the H-bridge is switching. The usable current for external loads varies depending

on operating conditions.

● The power dissipated by the internal BIAS LDO does not cause MAX25430 to exceed the maximum Continuous

Power Dissipation or Junction Temperature as specified in the Absolute Maximum Ratings section.

VDD_USB Linear Regulator Output

The MAX25430 integrates a 3.3V low-dropout linear regulator. The VDD_USB output is used as a clamping voltage during

high-voltage events such as short-to-battery or ESD strikes on HVDP/HVDM pins. The VDD_USB output is also used to

power the internal VBUS 10-bit ADC on MAX25430B devices. This regulator uses the 5V BIAS regulator as its input.

Connect a 1μF ceramic capacitor from VDD_USB to GND for proper operation of the linear regulator. Refer to USB PCB

Layout Guidelines for more information.

MAX25430 includes an output undervoltage comparator that sets the read-only VDD_USB_UV status bit when the

regulator output goes below VDD_USB_UV = 2.7V (typ).

An output overvoltage comparator is also included, which sets the read-only SHIELDING status bit when the regulator

output goes above VDD_USB_OV = 4.0V (typ).

The VDD_USB 3.3V LDO cannot be used to power external loads.

VDD_BMC Linear Regulator Output (MAX25430B only)

The MAX25430B integrates a 1.125V (typ.) regulated voltage reference required for BMC communication. Connect a

1μF ceramic capacitor from VDD_BMC to GND for proper operation of the linear regulator. Refer to USB PCB Layout

Guidelines for more information. Connect the pin directly to GND on MAX25430A devices.

VDD_IO Input

The VDD_IO pin must be connected to the external 1.8V, 3.3V or 5.0V VDD rail used for I2C communication by the I2C

Master (MCU, HUB or PD-Controller).

VDD_IO is used as the pullup voltage for SCL, SDA and ALERT pin.

I2C communication can begin as soon as the power-up sequence is done (i.e. ALERT asserts low after HVEN goes high

with VIN > UVLO) and the VDD_IO input is within a valid voltage.

In an application where neither 1.8V, 3.3V or 5.0V external supplies are available, VDD_IO pin can be tied to VDD_USB or

BIAS directly. It is recommended to place a 10nF ceramic capacitor from VDD_IO pin to GND to provide local decoupling.

The VDD_IO input voltage can withstand a maximum voltage of 6V.

VCONN Supply Input

The device requires an external supply on the VCONN input to provide the required power for the VCONN switch. The

input voltage range for the VCONN input is 3.0V to 5.5V but in the actual application, the input voltage will be either 3.3V

or 5.0V. Refer to the VCONN Switch section for more information on this feature.

MAX25430

Automotive 100W USB-PD Buck-Boost Port

Controller and Protector

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