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MAX1614 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1614 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 9 page High-Side, n-Channel MOSFET Switch Driver _______________________________________________________________________________________ 7 On/Off Control with a Single Pushbutton Switch The MAX1614’s separate on and off inputs allow maxi- mum flexibility in controlling the external MOSFETs. Connect a pushbutton switch to the ON pin and micro- controller (µC) I/O for single-button control. Connect the OFF pin to another µC I/O pin. On the first button depression, the MAX1614 turns on automatically; the signal is also detected by the µC. When the button is depressed a second time, the µC wraps around and turns off the MAX1614 by pulling low on the OFF pin (Figure 3). Simple Low-Battery Disconnect/Fresh Battery Reconnect Circuit A simple undervoltage disconnect circuit is often desir- able to prevent damage to secondary batteries due to repeated deep discharge or cell reversal. The Typical Operating Circuit turns off the MAX1614, disconnecting the battery from the load when the battery voltage falls below the minimum battery voltage required, (VLOW BATT). VLOW BATT = (R1 + R2)/R2 x VTH where VTH is the LBI input threshold (1.20V typ). When fresh cells are installed or the batteries are recharged, a µC or pushbutton reconnects the load. Using LBO to Generate Early Power-Fail Interrupt Many applications require an early warning indicating that power is failing so that the microprocessor (µP) can take care of any “housekeeping” functions (storing current settings in memory, etc.) before the power fails. Connect LBI through a resistor divider across the bat- tery, and connect LBO to the µP nonmaskable interrupt (NMI). Set the threshold so that LBO goes low when the battery decays to a point where regulation begins to degrade (Figure 4). VLOW BATT = (R1 + R2)/R2 x VTH, where VTH is the LBI input threshold (1.20V typ). Once housekeeping is complete, the µP can turn off the load by pulling OFF low. MAX1614 SHUTDOWN (CMOS OR TTL LOGIC) GND ON OFF Figure 2. Single-Line Shutdown Control MAX1614 OFF LBO GND LBI BATT SRC GATE ON NN LOAD TO µC R1 R2 Figure 3. Single-Pushbutton On/Off Control MAX1614 OFF LBO GND LBI BATT SRC GATE ON NN LOAD TO µC PORT PINS TO µC NONMASKABLE INTERRUPT R1 R2 Figure 4. Using LBO to Generate Early Power-Fail Interrupt |
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