EVAL-LT7826-AZ

製品概要

Evaluation circuit EVAL-LT7826-AZ is an open-loop switched capacitor (inductor-less) DC/DC converter. It can operate as a 2:1 voltage divider when input voltage is connected to VHIGH, or as a 1:2 voltage doubler when input voltage is connected to VLOW. 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. As a voltage divider, it can supply up to 8A of load current.

EVAL-LT7826-AZ features LT7826: a fully integrated monolithic switched capacitor 2:1 converter configurable as a voltage divider, doubler, or inverter. The LT7826 features integrated bootstrap diodes and a low quiescent current of 4μA at shutdown. It provides a compact, cost-effective solution for battery system applications, portable consumer electronics, and industrial applications.

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 conditions or IC overtemperature conditions, the FAULT pin is pulled low, and switching is stopped.

The EVAL-LT7826-AZ requires no load or light load start-up. After the input voltage is applied to the board, LT7826 enters pre-balance mode if the RUN pin and MODE pin are above their 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 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. Refer to the Typical Applications section of the LT7826 datasheet for an example of paralleling two LT7826 devices for interleaving operation.

The LT7826 is available in a 3mm x 3mm LFCSP package. The LT7826 datasheet gives a complete description of the part's operation and application information. The LT7826 datasheet must be read in conjunction with this user guide to use the evaluation circuit EVAL-LT7826-AZ properly.