LTC7124

Demonstration circuit DC2329A features the LTC7124IUDD: a wide input and output voltage range, high efficiency and power density, dual 3.5A DC/DC stepdown monolithic regulator. The input voltage range of the DC2329A is 3.1V to 17V. The default setting of VOUT1 is user selectable from 1.2V, 1.5V and 1.8V at 3.5A max. The default setting of VOUT2 is user selectable from 2.5V, 3.3V and 5.0V at 3.5A max. The default switching frequency of DC2329A is set at 1MHz typical. Programmable peak current limit of either 2.6A or 5A can be achieved by changing the setting of ILIM pin. Selectable internal or external loop compensation allows users more options to optimize the loop bandwidth and output load transient response. A user-selectable mode input is provided to allow users to trade off ripple noise for light load efficiency: pulse skipping mode (PS) or Burst Mode^® (BM) of operation delivers higher efficiency at light load while forced continuous conduction mode (FCM) is preferred for noise sensitive applications. The Mode pin can also be used to synchronize the switching frequency to an external clock. Programmable switching frequency ranges from 500kHz to 4MHz with a ±25% synchronization capture range. The constant frequency, peak current mode control architecture and integrated internal or optional external control loop compensation network, allows very fast transient response to line and load changes while maintaining loop stability.