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Operation of the LT1 303 is best understood by referring to the Block Diagram in Figure 2. When Cl's negative input, related to the output voltage by the appropriate resistor- divider ratio, is higher than the l.24V reference voltage, Cl's output is low. C2, A3 and the oscillator are turned off, drawing no current. Only the reference and Cl consume current, typically 1400dV When Cl's negative input drops below l.24V and overcomes Cl's 6mV hysteresis, Cl's output goes high, enabling the oscillator, current compara- tor C2 and driver A3. Quiescent current increases t0 2mA as the device goes into active switching mode. Ql then turns on in controlled satu ration for nominally 6~ or until current comparator C2 trips, whichever comes first. The switch then turns off forapproximatelyl.5~,then turns on again. The LT1303's switching causes current to alter- nately build up in Li and dump into output capacitor C4 via Dl, increasing the output voltage. When the output is high enough to cause Cl's output to go high, switching action ceases. Capacitor C4 is left to supply current to the load until VOUT decreases enough to force Cl's output high, and the entire cycle repeats. Figure 4 details relevant wave- forms. Cl's cycling causes low-to-mid-frequency ripple voltage on the output. Ripple can be reduced by making the