MAX1259 Battery Manager General Description Features Switches to Backup Battery if Power Fails The MAX1259 battery manager provides backup-battery switching for CMOS RAM, microprocessors, or other low- Consumes Less than 100nA of Battery Current power logic ICs. It automatically switches to the backup Power-Fail Output Signals Primary Power-Supply battery when the primary power supply is interrupted. Loss Low-loss switches guarantee an input-to-output differ- Battery Monitor Indicates Low Battery ential of only 200mV while supplying 250mA from the Battery Can Be Disconnected to Prevent Discharge primary power supply or 15mA from the battery. During Shipping Battery discharge during shipping does not occur in the Battery Automatically Reconnected when V is CC MAX1259, since the backup battery can be disconnected Applied by strobing the RST input. Pin-Compatible with the DS1259 A battery-fail output signal indicates when the backup bat- Supply Current Three Times Lower than DS1259 tery is below +2V, and a power-fail output signal indicates Available in Extended-Industrial and Military when the primary power supply is low. The MAX1259 Temperature Ranges monitors the backup battery, warns of impending power Ordering Information failures, and switches the memory to the battery when failures occur. The MAX1259 is pincompatible with the PART TEMP RANGE PIN-PACKAGE DS1259, but consumes three times less supply current. MAX1259C/D 0C to +70C Dice* Commercial, extended, and military temperature range MAX1259CPE 0C to +70C 16 PDIP devices are available. MAX1259CWE 0C to +70C 16 Wide SO MAX1259EPE -40C to +85C 16 PDIP Applications MAX1259EWE -40C to +85C 16 Wide SO Battery Backup for CMOS RAM MAX1259MJE -55C to +125C 16 CERDIP Uninterruptible Power Supplies *Contact factory for dice specifications. Computers Note: Devices in PDIP and SO packages are available in both Controllers leadedPb) and lead(Pb)-free packaging. Specify lead-free by adding the + symbol at the end of the part number when ordering. Lead-free not available for CERDIP package. Functional Diagram Pin Configuration V CCI VCCO TOP VIEW V 1 16 N.C. CCI V BATT V 2 15 V BATT CCI MAX1259 RESET RST BF 3 14 N.C. LOGIC V N.C. 4 13 CCO PF V BAT 5 12 CCO RST 6 11 PF BF 7 10 GND N.C. MAX1259 REF GND 8 9 N.C. BAT GND DIP/SO 19-4638 Rev 3 9/14MAX1259 Battery Manager Absolute Maximum Ratings Voltage on Any Pin (with respect to GND)............-0.3V to +7.0V Storage Temperature Range .............................-55C to +125C Operating Temperature Range Lead Temperature (soldering, 10s) .................................+300C C Suffix................................................................0C to +70C E Suffix.............................................................-40C to +85C M Suffix..........................................................-55C to +125C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended DC Operating Conditions (All grades, T = T to T , unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Primary Power Supply V (Note 1) 5.0 5.5 V CCI V + CCI MAX1259C 2.0 0.3 Input High Voltage (Note 1) V V IH V + CCI MAX1259E/M 2.4 0.3 Input Low Voltage V (Note 1) -0.3 +0.8 V IL Battery Voltage V Pin 2 (Note 2) 2.5 3.0 3.7 V BATT V - BATT Battery Output BAT Pin 5 (Note 1) V 0.1 DC Electrical Characteristics (V = +4.5V to +5.5V, all grades, T = T to T , unless otherwise noted.) CC A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Leakage Current I -1.0 +1.0 A LO I V = 2.4V (Note 3) -1.0 OH OH mA Output Current PF, BF I V = 0.4V 4.0 OL OL Input Supply Current I (Note 4) 2.00 3.33 mA CCI V Output Current I V = V - 0.2V, pins 12, 13 250 mA CCO CCO CCO CCI 1.26 x 1.26 x 1.26 x V BATT Power-Fail Trip Point V Pin 11 (Notes 2, 5) V - V TP BATT V + BATT 250mV 250mV Battery-Fail Trip Point V 2.0 V Pin 3 (BF detect) (Note 6) BATTF DC Electrical Characteristics (V < V , all grades, T = T to T , unless otherwise noted.) CCI BATT A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Output Current I V = V - 0.2V, pins 12, 13 (Note 7) 15 mA CCO CCO2 CCO BATT MAX1259C 100 nA Battery Leakage (Note 8) I MAX1259E 150 BATT MAX1259M 10 A BAT Output Current I Pin 5 (Note 9) 100 A BATOUT Maxim Integrated 2 www.maximintegrated.com