The LTC2380-24 and LTC2368-24 are low power, low noise, high speed, 24-bit SAR ADCs with an integrated digital averaging filter that operates from a single 2.5V supply. The demo manual refers to the LTC2380-24 but applies to both parts, the only difference being that the LTC2380-24 has fully differential inputs and the LTC2368-24 has pseudo-differential inputs. The LTC2380-24 has –117dB THD, consumes only 28mW and achieves ±4ppm INL max with no missing codes at 24 bits. The DC2289A demonstrates the DC and AC performance of the LTC2380-24 in conjunction with the DC590 or DC2026 QuikEval™ and DC890 PScope™ data collection boards. Use the DC590 or DC2026 to demonstrate DC performance such as peak-to-peak noise and DC linearity. Use the DC890 if precise sampling rates are required or to demonstrate AC performance such as SNR, THD, SINAD and SFDR. The Demonstration Circuit 2289A is intended to show recommended grounding, component placement and selection, routing and bypassing for this ADC.

Demonstration circuit 1231A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3850EGN. The entire circuit, including the bulk output capacitors, fit within a 1.04” × 0.94” area on all layers. The package style for the LTC3850EGN is a 28-lead narrow plastic SSOP. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output and a PGOOD signal and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes. Two versions of the board are available. DC-1231A-A has an on-board sense resistor for current feedback, while the DC1231A-B is configured with a DCR sense circuit that allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Demonstration circuit 2118B is a combination step-down battery charger and step-up battery backup regulator using the LTC4040 monolithic system power manager. The DC2118B has an input voltage range from 4.8V to 5.5V with overvoltage protection (OVP) to 40V, as limited by the external MOSFET. The input current is monitored to prioritize the load up to the 2.5A threshold before charge current is reduced. Battery Charging As initially configured, DC2118B is programmed for 2A charge current limit when in charge mode. The charge voltage is jumper-selectable in 8 discrete steps from 3.45V to 3.6V for LiFePO4 chemistry or 3.95V to 4.1V for Li-ion chemistry, according to the F2/F1/F0 programming input settings. The charge current limit is adjustable via the PROG pin resistor. End-of-charge status is triggered by current falling below C/8 and indicated by the CHRG LED. The optional NTC input provides temperature fault detection and status indicated by the FAULT LED. Charging can be enabled/disabled with the ENCHG jumper. Battery Backup Following an input power failure, the circuit automatically shifts to battery backup boost mode to regulate the VSYS output rail. The backup mode system output voltage is initially programmed for 5V. The input power failure status is indicated by the PFO LED. If VSYS ever falls below the programmed reset threshold voltage, the RST LED will change states to indicate the need to reset the system and recharge the battery. Backup regulation can be enabled/disabled with the ENBST jumper. For convenience, all LEDs can be disabled with the LED jumper to reduce the quiescent current of the system.

Demonstration circuit 719 is an Isolated Full-Bridge Converter with Synchronous Rectification featuring the LTC3723-1, LTC3901, LTC4440, and LT1431. It operates at 300kHz and produces a regulated 12V, 20A output in a quarter-brick footprint from a typical telecom input voltage range of 42 to 56V. Synchronous rectification helps to attain efficiency approaching 96%. Isolation voltage is 1500VDC.

Demonstration circuit 2317A is a 100V monolithic DC/ DC step-down regulator featuring the LTC7103. The demo board is designed for a 5V/2.3A output from a 5V to 100V input at 400kHz switching frequency. The wide input range makes it suitable for automotive, industrial, medical instrument, and telecom applications. This buck regulator has a peak efficiency of 93.5% at 12VIN, 88.3% at 48VIN and 81.5% at 100VIN.

Demonstration circuit 1432A is a synchronous buck controller featuring the LTC3851AEUD/LTC3851AEUD-1. It operates with an input voltage from 4.5V to 14V and provides 1.5V at up to 15A at the output. The demo circuit is available in two versions. DC1432A-A is configured with LTC3851AEUD which provides ISET function, while the DC1432A-B is configured with LTC3851AEUD-1 which provides PGOOD function.

is programmable to switch the power source from the energy harvester, rechargeable battery, and

It is suitable for multiplexed systems that switch full-scale voltage levels in successive channels

DC439A-A: Demo Board for the LTC1929 2-Phase, High Efficiency, Synchronous Step-Down Switching Regulators.

then the LTC7862 restarts. The timer limits how long the LTC7862 can switch when the power loss is