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MAX1844EEP Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1844EEP Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 24 page battery supply, the enable signal (SHDN) must be delayed until the battery voltage is present in order to ensure startup. The 5V bias supply provides VCC and gate-drive power, so the maximum current drawn is: IBIAS = ICC + f (QG1 + QG2) = 5mA to 30mA (typ) where ICC is 550µA (typ), f is the switching frequency, and QG1 and QG2 are the MOSFET data sheet total gate-charge specification limits at VGS = 5V. Free-Running, Constant-On-Time PWM Controller with Input Feed-Forward The Quick-PWM control architecture is a pseudo-fixed-fre- quency, constant-on-time on-demand PWM with voltage feed-forward (Figure 2). This architecture relies on the out- put filter capacitor’s ESR to act as a current-sense resistor, so the output ripple voltage provides the PWM ramp sig- nal. The control algorithm is simple: the high-side switch on-time is determined solely by a one-shot whose pulse High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers ______________________________________________________________________________________ 11 Figure 2. MAX1844 Functional Diagram REF -10% FROM OUT REF FB ERROR AMP TOFF TON REF +10% FEEDBACK MUX (SEE FIGURE 6) CHIP SUPPLY x2 1.0V R 0.1V POR OVP 9R ILIM VCC - 1V VCC - 1V VCC - 1V SHDN PGOOD ON-TIME COMPUTE TON 1-SHOT 1-SHOT TRIG IN 2V TO 28V TRIG Q Q S R 2V REF REF 5V OUTPUT DL CS GND VCC VDD LX ZERO CROSSING CURRENT LIMIT DH BST 5V +5V Q SKIP TON LATCH V+ Σ MAX1844 S R Q 0.7V 1.14V UVP 20ms TIMER OVP/UVP LATCH 0.1V OUT |
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