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C1608X5R0J106M Datasheet(PDF) 9 Page - Seiko Instruments Inc |
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C1608X5R0J106M Datasheet(HTML) 9 Page - Seiko Instruments Inc |
9 / 50 page STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR Rev.2.0_01 S-8363 Series 9 2. Low voltage start-up 2. 1 Start-up circuit The S-8363 Series can startup from 0.9 V. When the VOUT voltage at OFF / ON = “H” does not reach the STU release voltage, the start-up circuit starts the operation and outputs the fixed duty pulse to the CONT pin. By this, the VOUT voltage starts step-up. After that, the VOUT voltage reaches the STU release voltage and the STU mode circuit is set in STU release condition, therefore, the switching control circuit starts stable operation due to the soft-start function. Simultaneously, the start-up circuit is set in disable condition, so that the S-8363 Series prevents excessive current consumption. 2. 2 Start-up mode (STU mode) circuit The STU mode circuit monitors the VOUT voltage, and switches the operation modes between start-up period and normal control period of the switching control circuit. The STU release voltage is internally fixed at 1.4 V (typ.), and has hysteresis of approx. 0.15 V. When the VOUT voltage decreases to 1.25 V (typ.) from release condition, the STU mode circuit is set in the STU detection condition, shifting to the start-up period. Several μs to several ten μs is taken to shift from STU release to PWM release. During this the step-up operation is not performed, therefore, the VOUT voltage may largely decrease depending on the size of load. During applying OFF / ON = “L”, the STU mode circuit is set in disable condition, so that the S-8363 Series prevents excessive current consumption. CONT VOUT MUX Start-up Circuit VIN VOUT VIN STU Mode Circuit VD Load SD L = 2.2 μH COUT 10 μF Switching Control Circuit VSS Figure 8 Start-up Circuit Time [s] Switching delay Output voltage (VOUT) Start-up period CONT voltage (VCONT) PWM control period STU detection STU release Figure 9 Start-up Sequence |
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