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MAX1612EEE Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1612EEE Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page Bridge-Battery Backup Controllers for Notebooks _______________________________________________________________________________________ 5 NAME FUNCTION 1 ISET Bridge-Battery Charge-Current Input. Connect a current-setting resistor from this input to a voltage higher than the bridge battery. Maximum current rating is 10mA. Pulling ISET below 0.4V resets the internal counter. 2 BBATT Bridge-Battery Connection. Bridge-battery charger output. PIN 3 LX Step-Up DC-DC Converter N-Channel MOSFET Drain. The maximum operating range is 12V. 4 LBO Open-Drain Low-Battery Detector Output. When VLBI falls below 1.8V, LBO sinks current. When VLBI rises above 2.0V, LBO becomes high impedance. 8 FULL Open-Drain Bridge-Battery Full Indicator Output. When the internal timer reaches all 1sec, FULL goes high impedance. 7 CCMD Charge Command Input. When low with DCMD high, the internal switch from ISET to BBATT is closed, charging the bridge battery. CCMD is inhibited if DCMD is low. The internal timer counts up at a frequency set by the CC capacitor. 6 DCMD Discharge Command Input. When low with CCMD high, the internal timer counts down at a frequency set by the CD capacitor. When both DCMD and CCMD are low, discharge takes precedence. 5 BBON Bridge-Battery On Input. When high, the DC-DC converter turns off. When pulled low through an external resistor, the resistor sets the peak inductor current. The inductor current is approximately 42,000 times the current in the external resistor (RBBON). 13 CD Discharge Oscillator Capacitor Input. This capacitor sets the discharging oscillator frequency, which determines the maximum time to decrement the counter from all 1s to all 0s. Calculate the capacitor value as follows: CD (in nF) = 4.3 · discharge time (in hours). 12 CC Charge Oscillator Capacitor Input. This capacitor programs the charging oscillator frequency, which sets the time for the internal counter to reach all 1s. Determine the capacitor value by: CC (in nF) = 4.3 · charge time (in hours). 11 GND Ground 10 LBI Low-Battery-Detector Input. When LBI falls below 1.8V, LBO goes low and sinks current. When LBI goes above 2.0V, LBO goes high impedance. Hysteresis is typically 200mV. 9 FB Feedback Input of Step-Up DC-DC Converter. Regulates to 2V. Connect feedback resistors to set output voltage (Figure 2). Pin Description 14 PGND Power Ground and Step-Up DC-DC Converter N-Channel MOSFET Source 15 LRO 5V (MAX1612) or 3.3V (MAX1613) Linear-Regulator Output. Bypass to GND with a 1µF capacitor. Maximum external load current is 10mA. 16 LRI Linear-Regulator Supply Input |
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