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MAX6770 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6770 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 23 page Automotive Micropower Linear Regulators with Supervisor _______________________________________________________________________________________ 9 Pin Description (continued) PIN MAX6765/ MAX6766 MAX6767/ MAX6768 MAX6769/ MAX6770 MAX6771/ MAX6772 MAX6773/ MAX6773B/ MAX6774/ MAX6774B NAME FUNCTION —4 — — — HOLD Active-Low Regulator Hold Input. When HOLD is forced low, OUT remains on even if ENABLE is pulled low. To shut down the regulator, release HOLD after ENABLE is pulled low. Connect HOLD to OUT or leave unconnected if unused. HOLD is internally connected to OUT through a 1.8µA current source. — 6 6 6 6 SET Feedback Input for Setting the Output Voltage. Connect SET to GND to select the preset output voltage. Connect to an external resistive divider for adjustable output operation. —— 4 — — RESETIN Adjustable Reset Threshold Input. Connect to a resistive divider to set the desired threshold. ——— 3 — ENABLE1 Active-High Enable Input 1. Drive ENABLE1 high to turn on the regulator. ENABLE1 is internally connected to ground through a 0.6µA current sink. ——— 4 — ENABLE2 Active-High Enable Input 2. Drive ENABLE2 high to turn on the regulator. ENABLE2 is internally connected to ground through a 0.6µA current sink. ——— — 4 WDI Watchdog Timer Input. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer expires and the reset output asserts for the reset timeout period. The internal watchdog timer clears whenever a reset is asserted or WDI sees a rising or falling edge. The watchdog timer cannot be disabled. Do not leave WDI unconnected. EP EP EP EP EP — Exposed Paddle. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. Detailed Description The MAX6765–MAX6774B low-quiescent-current, high- voltage linear regulators operate from a 4V to 72V input voltage and deliver more than 100mA of load current. The MAX6765–MAX6774B include an integrated µP reset circuit that monitors the regulator output voltage and asserts a reset output when OUT falls below a threshold limit, and includes an internally fixed or adjustable reset timeout using a capacitor from TIME- OUT to ground. All devices are available in a preset out- put-voltage option of +1.8V, +2.5V, +3.3V, and +5V. The output voltage of the MAX6767–MAX6774B is adjustable from +1.8V to +11V using a resistive divider at SET. The MAX6773/MAX6774 include a watchdog timer (WDI) with a 1.6s (typ) watchdog timeout period and the MAX6773B/MAX6774B include a watchdog timer with a 50ms (typ) watchdog timeout period. The MAX6769/ MAX6770 feature an adjustable reset threshold using a resistive divider between the monitored voltage, RESETIN, and GND; see the Functional Diagrams. The MAX6771/MAX6772 provide dual enable inputs (ENABLE1 and ENABLE2) to turn on and off the regula- tor either through an ignition switch or a bus transceiver. |
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