DC1674A-B Analog Devices

DEMO MANUAL DC1674A-A LTC4155EUFD Dual Input Power Manager/3.5A Li-Ion Battery 2 Charger with I C Control and USB OTG DESCRIPTION Demonstration Circuit 1674A-A is dual input power Most functions on the LTC 4155EUFD are controlled via 2 2 manager/3.5A Li-Ion battery charger with I C control and the I C serial interface. The LTC4155EUFD also provides 2 USB On-The-Go (OTG). extensive status information via the I C serial interface. The dual input multiplexer, overvoltage protection (OVP) Please refer to the LTC4155EUFD data sheet for details 2 and reverse voltage protection (RVP) is implemented with about the I C serial interface, control and status registers, external N-channel MOSFETs. and the electrical and timing specifications. An on board buck regulator generates the V voltage The LTC4155EUFD does modify several of its own control OUT from the active input voltage. This voltage is regulated to registers to reflect the current operating conditions. minimize the dissipation in the battery charger. The mini- Design files for this circuit board are available at mum voltage of the V regulator is 3.5V to provide an OUT DEMO MANUAL DC1674A-A QUICK START PROCEDURE DC1674A-A working input voltage range is 4.35V to5.5V for proper measurement equipment setup and follow the on both the WALL and USB input. The DC1674A-A will evaluation procedure below using the DC590B board. tolerate non-operating overvoltage inputs up to 27V. NOTE. When measuring the input or output voltage ripple, 2 DC1674A-A utilizes the DC590B, USB to I C interface care must be taken to avoid a long ground lead on the board, to control the LTC4155EUFD and to read back the oscilloscope probe. Measure the input or output voltage contents of the command and status registers. ripple by touching the probe tip directly across the V or IN The DC1674A-A is easy to set up to evaluate the perfor- V and GND terminals. See Figure 2 for proper scope OUT mance of the LTC4155EUFD. Refer to Figure 1 and Figure2 probe technique. Figure 1. Proper Measurement Equipment Setup Figure 2. Measuring Input or Output Ripple dc1674aafb 2