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MAX1927REUB Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1927REUB Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters _______________________________________________________________________________________ 7 Pin Description PIN NAME FUNCTION 1 PWM Forced-PWM Input. Drive to GND to use PWM at medium to heavy loads and pulse-skipping at light loads. Drive to BATT to force PWM operation at all loads. 2 GND Ground 3 REF Internal 1.25V Reference. Bypass to GND with a 0.1µF capacitor. 4FB Output Feedback Sense Input. To set the output voltage to the preset voltage (MAX1928), connect FB directly to the output. To adjust the output voltage (MAX1927R), connect FB to the center of an external resistor- divider between the output and GND. FB regulation voltage is 0.75V. 5 COMP Compensation Input. See the Compensation, Stability, and Output Capacitor section for compensation component selection. 6 SHDN Shutdown Control Input. Drive low to shut down the converter. Drive high for normal operation. 7 PGND Power Ground 8 LX Inductor Connection to the drains of the internal power MOSFETs. 9 BATT Supply Voltage Input. Connect to a 2.6V to 5.5V source. Bypass to GND with a low-ESR 10µF capacitor. 10 POK Power-OK Open-Drain Output. Once the soft-start routine has completed, POK goes high impedance 20ms after FB exceeds 90% of its expected final value. N N P P SLOPE COMPENSATION POWER-OK CONTROL 1MHz OSC BIAS COMP BATT PWM CONTROL 1.25V REFERENCE PFM CURRENT COMPARATOR PWM COMPARATOR PWM ILIM COMPARATOR TO COMP N-CHANNEL CURRENT COMPARATOR PGND POK FB REF MAX1927R ONLY GND MAX1928 ONLY LX SHDN MAX1927 MAX1928 Figure 1. Simplified Functional Diagram |
Similar Part No. - MAX1927REUB |
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Similar Description - MAX1927REUB |
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