Analog Devices Inc. EVAL-LT7826-AZ Evaluation Board
Analog Devices EVAL-LT7826-AZ Evaluation Board evaluates the LT7826, an open-loop switched capacitor (inductor-less) DC-DC converter. The EVAL-LT7826-AZ operates from a VHIGH range of 3.4V to 17V and a VLOW range of 1.7V to 8.5V. LT7826's switching frequency is fixed to 500kHz. It can supply up to 8A of load current as a voltage divider.
The EVAL-LT7826-AZ allows users to program the input voltage enable and undervoltage lockout (UVLO) thresholds via RUN pin resistor dividers. LT7826 also offers protection functions. At overcurrent or IC overtemperature conditions, the FAULT pin is pulled low, and switching is stopped.
The EVAL-LT7826-AZ requires no load or light load startup. After the input voltage is applied to the board, LT7826 enters pre-balance mode if the RUN pin and MODE pin are above the device's thresholds, and INTVCC is above the UVLO threshold. During pre-balance mode, capacitors are charged with reduced current and switching frequency. Full load current can be applied after pre-balance is finished and an output voltage is established.
The Analog Devices EVAL-LT7826-AZ can be paralleled with other EVAL-LT7826-AZ circuit boards. Switching synchronization is available through the MODE turret for frequency tuning and interleaving operation.
Features
- 17V maximum VHIGH voltage
- Standalone voltage divider (2:1) or voltage doubler (1:2)
- 8A maximum output current as a voltage divider
- Over 97% peak efficiency
- Soft startup into steady-state operation
- Inrush current limit and overcurrent protection
- Integrated bootstrap diodes
Applications
- Battery system applications
- Portable consumer electronics
- Industrial applications
Test Setup
Board Layout
Related DC-DC Converter
Analog Devices Inc. LT7826 Integrated Monolithic DC-DC Converter
Achieves very high efficiency with a switched capacitor architecture.