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MAX883CSA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX883CSA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 17 page 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators 8 _______________________________________________________________________________________ In adjustable mode, the user selects an output voltage in the 1.25V to 11V range by connecting two external resistors, used as a voltage-divider, to the SET pin (Figure 2). The output voltage is set by the following equation: where VSET = 1.20V. To simplify resistor selection: Since the input bias current at SET is nominally zero, large resistance values can be used for R1 and R2 to minimize power consumption without losing accuracy. Up to 1.5M Ω is acceptable for R2. Since the VSET toler- ance is less than ±40mV, the output can be set using fixed resistors instead of trim pots. Standby Mode (MAX882) The MAX882 has a standby feature that disconnects the input from the output when STBY is brought low, but keeps all other circuitry awake. In this mode, VOUT drops to 0, and the internal biasing circuitry (including the low-battery comparator) remains on. The maximum quiescent current during standby is 15µA. STBY is a comparator input with the other input internally tied to the reference voltage. Use a resistor network as shown in Figure 3 to set a standby-mode threshold voltage for undervoltage lockout. Connect STBY to IN for normal operation. OFF Mode (MAX883/MAX884) A low-logic input on the OFF pin shuts down the MAX883/MAX884. In this mode, the pass transistor, control circuit, reference, and all biases are turned off, and the supply current is reduced to less than 1µA. LBO is undefined in OFF mode. Connect OFF to IN for normal operation. R1 R2 V V 1 OUT SET =− ⎛ ⎝⎜ ⎞ ⎠⎟ VV R R OUT SET =+ ⎛ ⎝⎜ ⎞ ⎠⎟ 1 1 2 Figure 1. MAX882/MAX883/MAX884 Functional Diagram P OUT SET R1 R2 65mV ERROR AMP OFF (STBY) GND LBO LBI N IN MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT REVERSE- CURRENT PROTECTION SHUT- DOWN LOGIC 1.20V REFERENCE THERMAL SENSOR ( ) ARE FOR MAX882. DUAL-MODE COMPARATOR LOW-BATTERY COMPARATOR |
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