MAX16023/MAX16024 19-4249 Rev 0 8/08 Battery-Backup Circuits with Regulated Output Voltage General Description Features The MAX16023/MAX16024 low-power battery-backup cir- System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V cuits with a regulated output are capable of delivering up Power-Supply Voltages to 100mA output current. The MAX16023/MAX16024 100mA Low-Dropout Regulator include a low-dropout regulator, a microprocessor (P) reset circuit, and a battery switchover circuit. Additional Factory-Trimmed and Adjustable Output Voltages available features include a manual reset, a power-fail 1.53V to 5.5V Operating Voltage Range comparator, and a battery-on indicator. These devices Low-Power Consumption: 4A (typ) reduce the number of external components to minimize board space and improve reliability. Power-Fail Comparators for Monitoring Voltages The MAX16023/MAX16024 are ideally suited for provid- Down to 0.6V ing power for backing up critical memory such as static Battery-On Indicator random-access memory (SRAM) or real-time clocks Battery Freshness Seal (RTCs). The regulated output is powered by V when it CC is present and switches over to the backup power dur- On-Board Gating of CE Signals, 1.5ns ing brownout. The MAX16023/MAX16024 accept an Propagation Delay (MAX16024) input voltage from 1.53V to 5.5V and provide fixed stan- Debounced Manual-Reset Input dard output voltages of 1.2V, 1.8V, 2.5V, 3.0V, and 3.3V. The MAX16024 offers the ability to externally set the out- 145ms (min) Reset Timeout Period put voltage using a resistive divider. All outputs are Tiny 8-Pin and 10-Pin TDFN Packages available with push-pull or open-drain configurations. UL Certified to Conform to IEC 60950-1 The MAX16023 offers a power-fail comparator for monitor- ing an additional voltage or for providing an early power- Ordering Information fail warning. Another feature includes a manual-reset input (MAX16023/MAX16024). The MAX16024 also features PART TEMP RANGE PIN-PACKAGE a battery-on indicator and chip-enable gating function. MAX16023 TA +T -40C to +85C 8 TDFN-EP* The MAX16023/MAX16024 are offered in 8- and 10-pin MAX16024 TB +T -40C to +85C 10 TDFN-EP* TDFN packages and are fully specified from -40C to +85C temperature range. The first placeholder designates reset output options. A letter L in this placeholder indicates a push-pull output and letter P Applications indicates an open-drain output. The next placeholder desig- Main/Backup Power for RTCs/SRAM nates the reset threshold (Table 1). The last two placeholders Industrial Controls designate output voltage (Table 2). For the MAX16024 with GPS Systems adjustable output voltage version, there are no last two place- holders. Set-Top Boxes +Denotes a lead-free/RoHS-compliant package. Point-of-Sale Equipment T = Tape and reel. Portable/Battery Equipment *EP = Exposed pad. UL is a registered trademark of Underwriters Laboratories, Inc. Pin Configurations 8 7 6 5 10 9 8 7 6 MAX16023 MAX16024 *EP *EP + + 1 2 3 4 1 2 3 4 5 TDFN TDFN *EP = EXPOSED PAD Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. V OUT CC BATT RESET MR GND PFI PFO CEIN CEOUT V OUT CC BATT RESET MR GND SET BATT ONBattery-Backup Circuits with Regulated Output Voltage ABSOLUTE MAXIMUM RATINGS V , BATT, OUT to GND..........................................-0.3V to +6V Output Current CC RESET, PFO, BATT ON (all open drain) OUT Short Circuit to GND Duration....................................10s to GND..................................................................-0.3V to +6V RESET, BATT ON, CEOUT..............................................20mA RESET, PFO, BATT ON (all push-pull) Continuous Power Dissipation (T = +70C) A to GND .................................................-0.3V to (V + 0.3V) 8-Pin TDFN (derate 24.4mW/C above +70C) .........1951mW OUT PFI, CEIN, CEOUT to GND.......................-0.3V to (V + 0.3V) 10-Pin TDFN (derate 24.4mW/C above +70C) .......1951mW OUT MR to GND .................................................-0.3V to (V + 0.3V) Thermal Resistance (Note 1) CC Input Current (8-Pin and 10-Pin TDFN)........................................41C/W JA V Peak Current.....................................................................1A Operating Temperature Range ...........................-40C to +85C CC V Continuous Current ...............................................250mA Junction Temperature......................................................+150C CC BATT Peak Current .......................................................500mA Storage Temperature Range .............................-65C to +150C BATT Continuous Current ...............................................70mA Lead Temperature (soldering, 10s) .................................+300C Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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. ELECTRICAL CHARACTERISTICS (V = 1.53V to 5.5V, V = 3V, reset not asserted, T = T = -40C to +85C, C = 10F, unless otherwise noted. Typical val- CC BATT A J OUT ues are at T = T = +25C.) (Note 2) A J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V V (Note 3) 1.53 5.5 V CC, BATT LDO = 1.2V 4.3 6 LDO = 1.8V 4.7 7 V = LDO + 0.5V, CC LDO = 2.5V 5.2 7.5 no load LDO = 3V 5.5 8 LDO = 3.3V 5.7 8 Supply Current I A CC LDO = 1.2V 16 20 LDO = 1.8V 16 21 V = LDO + 0.5V, CC LDO = 2.5V 16 18.1 I = 20mA OUT LDO = 3V 17 18.6 LDO = 3.3V 17 19 Supply Current in Battery-Backup V = 0, V = 3V, CC BATT I 3.5 5.26 A BATT Mode no dropout, no load BATT Standby Current V > V + 0.2V -0.01 +0.01 A CC BATT SET Reference Voltage V MAX16024 TB , V = 2.2V 1.144 1.2 1.272 V SET CC SET Input Leakage Current MAX16024 TB , SET = 1.2V -20 +20 nA Output Voltage Range V MAX16024 TB , V > V 1.8 5.25 V OUT CC OUT LDO = 1.2V 1.145 1.2 1.270 LDO = 1.8V 1.704 1.8 1.900 Output Voltage Accuracy I = 1mA LDO = 2.5V 2.368 2.5 2.634 V OUT LDO = 3V 2.837 3 3.165 LDO = 3.3V 3.114 3.3 3.482 2 MAX16023/MAX16024