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MAX1612 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1612 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page _______________Detailed Description The MAX1612/MAX1613 manage the bridge battery (auxiliary battery) in portable systems. These devices consist of a timer block that monitors the charging process, a linear regulator for supplying IC power and external circuitry to the MAX1612/MAX1613, and a DC- DC step-up converter that powers the system when the main battery is removed (Figure 1). The boost DC-DC converter reduces the number of bridge-battery cells required to supply the system’s DC-DC converter. When the main supply is present, the DC-DC converter is inactive, reducing the drain on the main battery to only 18µA. However, if the main battery voltage falls (as detected by the low-battery comparator), the bridge battery becomes the input source. The MAX1612/MAX1613 have an internal linear regula- tor set at +5V (MAX1612) or +3.3V (MAX1613). The lin- ear regulator can deliver a load up to 10mA, making it capable of powering external components such as a microcontroller (Figure 4). An undervoltage lockout fea- ture disables the device when the input voltage falls below the operating range, preventing the DC-DC con- verter from inadvertently powering up. The MAX1612/MAX1613 feature an internal counter intended to track the charging and discharging process. The counter tracks the charge on the bridge battery, allowing trickle charge to terminate when the maximum charge is achieved. The charging rate is determined by current through the ISET switch, and limited by the switch’s maximum current specification as well as by the bridge cell’s charging capability. As Bridge-Battery Backup Controllers for Notebooks 6 _______________________________________________________________________________________ N-CHANNEL PGND VCHARGE VMAIN RISET L1 ISET LRI BBATT VBBATT LX FB D1 R1 R2 R3 COUT LBI DISCHARGE OSCILLATOR TIMER BLOCK CHARGE/DISCHARGE COUNTER CHARGE OSCILLATOR 2.0V REFERENCE +3.3/+5V LINEAR REGULATOR 1.8V/2.0V BBON RBBON DCMD CCMD FULL CD CC CCD CCC GND LRO TO EXTERNAL LOADS LBO TO MAIN DC-DC MAX1612 MAX1613 PULSE- FREQUENCY MODULATION CONTROL BLOCK Figure 1. Functional Diagram |
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