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LTC2905 Datasheet(PDF) 10 Page - Linear Technology |
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LTC2905 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page 10 LTC2903-1 29031f a APPLICATIO S I FOR ATIO Triple Adjustable Options (LTC2903-D1, LTC2903-E1) LTC2903-D1 and LTC2903-E1 provide 3 adjustable in- puts: V2, V3 and V4. The V1 threshold is 3.086V (3.3V, 5%) for option D1 and 4.675 (5V, 5%) for option E1. For each supply monitored by an adjustable input, connect an external resistor divider (R1 and R2) between the positive voltage being sensed and ground. The tap point for each divider is then connected to each adjustable input. All adjustable inputs are compared to an internal 0.5V reference. Figure 3 shows how each adjustable input is configured. Calculate the trip voltage from: VV R R TRIP =+ ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ 05 1 1 2 . Figure 3. Setting the Positive Adjustable Trip Point V1 (V) 0 0 0.1 0.3 0.4 0.5 0.7 0.1 0.5 0.7 29031 F02 0.2 0.6 0.4 0.9 1.0 0.2 0.3 0.6 0.8 TA = 25°C V1 ONLY COMPETITION PART V1 = V2 = V3 – + 0.5V 29031 F03 V4 VTRIP R1 LTC2903-A1 R2 + – Figure 2. RST Output Voltage with a 10k Pull-Up to V1 (Enlarged Area of Detail) current sinking ability for single supply and triple supply- tracking applications. Figure 2 shows a detailed view of the reset pin voltage with a 10k pull-up resistor to V1. The LTC2903-1 supervisors derive their internal supply voltage (VCC) automatically from the greater voltage on the V1 and V2 inputs (VCC = V1 for options D1 and E1). With all supply inputs above threshold, the quiescent current drawn from VCC is 20µA (typ). Supply Monitoring The LTC2903-1 accurately monitors four inputs in a small 6-lead SOT-23 package. The low voltage reset output includes an integrated 200ms reset delay timer. The reset line pulls high 200ms after all voltage inputs exceed their respective thresholds. The reset output remains low dur- ing power-up, power-down and brownout conditions on any of the voltage inputs. |
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