DC818A

DC818A demonstration circuit is a quad power supply sequencer featuring the LTC2924. This demonstration circuit can configure the LTC2924 to sequence up to 4 power supplies via any combination of pass FETS or power supply enable control inputs. The 0.61V reference of the LTC2924 permits the DC818A to be easily modified by simple resistor changes to work with any voltage level from 5V down to 0.8V. The schematic provides a table of resistor values for common supply voltages: 5V, 3.3V, 3.0V, 2.8V, 2.5V, 1.8V, 1.6V, 1.2V and 1.0V. Convenient test points are provided to facilitate evaluation of the power up and power down sequencing. Additional jumper options are provided to permit cascading multiple DC818s for additional channels. The circuit board is assembled with four IRL3714ZS N-channel DD packaged MOSFETs capable of controlling up to 10A loads for connecting each of four rails with the an associated load.

• 3V to 6V input supply voltage range
• 1.5mA typical input supply current at VIN = 3.6V, ILOAD = 100mA
• 0.6060 typical ON, low to high threshold
• 0.6074V typical ON, high to low threshold
• 0.6081V typical IN1-IN4 low to high threshold
• 0.6087V typical IN1-IN4 high to low threshold
• 10µA typical OUT1-OUT4 on current