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MAX630 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX630 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 14 page Low-Battery Detector The low-battery detector compares the voltage on LBR with the internal 1.31V reference. The output, LBD, is an open-drain N-channel MOSFET. In addition to detecting and warning of a low battery voltage, the comparator can also perform other voltage-monitoring operations such as power-failure detection. Another use of the low-battery detector is to lower the oscillator frequency when the input voltage goes below a specified level. Lowering the oscillator frequency increases the available output power, compensating for the decrease in available power caused by reduced input voltage (see Figure 5). Logic-Level Shutdown Input The shutdown mode is entered whenever IC (pin 6) is driven below 0.2V or left floating. When shut down, the MAX630’s analog circuitry, oscillator, LX, and LBD out- puts are turned off. The device’s quiescent current dur- ing shutdown is typically 10nA (1µA max). Bootstrapped Operation In most circuits, the preferred source of +VS voltage for the MAX630 and MAX4193 is the boosted output volt- age. This is often referred to as a “bootstrapped” oper- ation since the circuit figuratively “lifts” itself up. The on-resistance of the N-channel LX output decreas- es with an increase in +VS; however, the device operat- ing current goes up with +VS (see the Typical Operating Characteristics, IS vs. +VS graph). In circuits with very low output current and input voltages greater than 3V, it may be more efficient to connect +VS direct- ly to the input voltage rather than bootstrap. CMOS Micropower Step-Up Switching Regulator _______________________________________________________________________________________ 5 COMP 2 +5V INPUT R3 169k Ω R4 100k Ω L1 470 LOW BATTERY INPUT 1.31V OSC RON ≅ 3Ω 40kHz COMP 1 1.31V BANDGAP REFERENCE AND BIAS GENERATOR 1 LBR 2CX 3LX 4 GND D1 1N4148 +VS 5 IC 6 VFB 7 LBD 8 LOW-BATTERY OUTPUT (LOW IF INPUT < 3V) CC R1 499k Ω R2 47.5k Ω SHUTDOWN OPERATE +15V OUTPUT 20mA C1 470 μF 25V MAX630 COMP 2 Figure 1. +5V to +15V Converter and Block Diagram |
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Similar Description - MAX630 |
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