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MAX1973 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1973 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Smallest 1A, 1.4MHz Step-Down Regulators 8 _______________________________________________________________________________________ Pin Description NAME PIN MAX1973 MAX1974 FUNCTION 1 FBSEL FBSEL Feedback-Mode Selector. Connect FBSEL to GND to set the output voltage to 1.8V (MAX1973) or 1V (MAX1974). Connect FBSEL to IN to set the output voltage to 2.5V (MAX1973) or 1.5V (MAX1974). Leave FBSEL unconnected to set the output voltage using a resistor-divider at FB. 2 COMP COMP Compensation. Connect a series RC network to GND. COMP is internally pulled to GND when the device is in shutdown or in undervoltage lockout (see the Compen- sation Components section). 3FB FB Feedback Input. Connect to the output if a preset voltage is used, or to a resistor- divider from the output to GND for an adjustable output voltage. 4SS SS Soft-Start Pin and Reference Output. Bypass to GND with at least 0.01µF. Connect 0.1µF to GND for a soft-start ramp time of 6.25ms for the MAX1973, or 3.75ms for the MAX1974. SS is internally pulled to GND when the device is shut down or in undervoltage lockout. 5 GND GND Ground CTL2 — Control Input 2. Controls enable/disable and voltage margining (see Table 1). 6 — POK Power-OK Output. Open-drain output goes low when output is below 90% of nominal output. POK is also low when the device is shut down or in undervoltage lockout. 7 PGND PGND Power Ground 8 LX LX Inductor Connection. Connect an inductor from LX to the output. 9IN IN Input Supply Voltage. Input voltage range is 2.6V to 5.5V. Connect a 4.7µF capacitor from IN to PGND. CTL1 — Control Input 1. Controls Enable/Disable and voltage margining (see Table 1). 10 — ON Enable Input. Connect to IN or drive high for normal operation. Drive low to put device in shutdown. MAX1974 WITH 100k Ω PULLUP RESISTOR FROM POK TO IN, ILOAD = 100mA MAX1974 POK AND INPUT VOLTAGE VPOK 2V/div 0 MAX1973/74 toc15 20ms/div VIN 1V/div VOUT 2V/div 0 0 VIN = 5V, VOUT = 2.5V, IOUT = 800mA, -4% TO +4% TO -4% MAX1973 VOLTAGE MARGIN STEP CHANGE RESPONSE VOUT IIN 1V/div 0 MAX1973/74 toc14 500mA/div 1ms/div VCTL1 VCTL2 0 10V/div 0 10V/div 0 Typical Operating Characteristics (continued) (Circuits of Figure 2, 3, and 4; TA = +25°C, unless otherwise noted.) |
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