Analog Devices LTC3676-1 | Demoboard DC1976A-B

Description

Demonstration circuit 1976A-B is a multioutput power supply with a pushbutton controller and I2C, featuring the LTC®3676EUJ-1. The LTC3676EUJ-1 has four synchronous buck regulators, an always-on LDO and three LDO regulators. The input voltage range of the LTC3676EUJ-1 is ideal for single-cell Li-Ion/Polymer battery applications.

The switching regulator settings, such as enables, feedback voltages, operating modes and other functions, can be controlled via I2C. All of the regulators, except the always-on LDO1 and LD04, can also be enabled viaexternal enable pins. After the first regulator is enabled, the remaining enable pins use a precision threshold to allow hardwired power-up sequences. All the regulators, except LDO1, can also be enabled via the I2C.

The LTC3676EUJ-1 has three status registers, PGSTATL, PGSTATR and IRQSTAT, that can be used to determine the current state of the device.

The three status registers, which can be read via I2C, indicate which regulators are in regulation and if a UV or OT event occurred. The command registers, which are used to control the switching regulators and program the special functions, can also be read back via I2C to assure the correct data was received.

The LTC3676-1 has a ±1.5A buck regulator configured to support DDR termination plus a VTTR reference output.

Refer to the LTC3676EUJ-1 data sheet for more details on the electrical and timing specifications and for an explanation of the different device options.

More information

• Datasheet
• IC product information