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MAX8869 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX8869 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page Output Voltage Selection The MAX8869 features Dual Mode operation. Connect SET to GND (Figure 2) for preset voltage mode (see Ordering Information). In adjustable mode, set the out- put between +0.8V to +5.0V through two external resis- tors connected as a voltage-divider to SET (Figure 3). The output voltage is set by the following equation: VOUT = VSET (1 + R1 / R2) where VSET = +0.8V. To simplify resistor selection: R1 = R2 (VOUT / VSET - 1) Since the input bias current at SET is nominally 50nA, large resistance values can be used for R1 and R2 to minimize power consumption without losing efficiency. Up to 80kΩ is acceptable for R2. In preset voltage mode, the impedance between SET and ground should be less than 10kΩ. Otherwise, spu- rious conditions could cause the voltage at SET to exceed the 80mV Dual Mode threshold. Shutdown A logic low on SHDN disables the MAX8869. In shut- down, the pass transistor, control circuitry, reference, and all biases are turned off, reducing supply current to typically 0.1µA. Connect SHDN to IN for normal opera- tion. In shutdown, RST is low and the soft-start capaci- tor is discharged. RST Comparator The MAX8869 features a low VOUT indicator that asserts when the output voltage falls out of regulation. The open-drain RST goes low when OUT falls 8% 1A, Microcap, Low-Dropout, Linear Regulator _______________________________________________________________________________________ 7 Figure 1. Functional Diagram Figure 2. Typical Operating Circuit with Preset Output Voltage MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT SHUTDOWN LOGIC 0.8V REFERENCE SS GND SHDN IN OUT RST SET VSS 6 μA 736mV THERMAL SENSOR OUT DELAY TIMER IN 3ms SHUTDOWN ERROR AMP DUAL MODE COMPARATOR 80mV 92% VOUT DETECTOR VSS PMOS NMOS R1 R2 MAX8869 IN IN IN IN SHDN SS OUT OUT OUT OUT RST SET GND ON OFF COUT 1 µF CIN 1 µF CSS VOUT VIN RESET OUTPUT MAX8869 |
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Similar Description - MAX8869 |
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