MAX16016/MAX16020/MAX16021 19-4145 Rev 6 11/11 Low-Power P Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating General Description Features System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V The MAX16016/MAX16020/MAX16021 supervisory cir- Power-Supply Voltages cuits monitor power supplies, provide battery-backup control, and chip-enable (CE) gating to write protect 1.53V to 5.5V Operating Voltage Range memory in microprocessor (P)-based systems. These Low 1.2A Supply Current (0.25A in Battery- low-power devices improve system reliability by providing Backup Mode) several supervisory functions in a small, single integrated 145ms (min) Reset Timeout Period solution. Battery Freshness Seal The MAX16016/MAX16020/MAX16021 perform four On-Board Gating of CE Signals, 1.5ns basic system functions: Propagation Delay (MAX16020/MAX16021) 1) Provide a P reset output during V supply power- CC Debounced Manual Reset Input up, power-down, and brownout conditions. Watchdog Timer, 1.2s (typ) Timeout 2) Control V to battery-backup switching internally CC Power-Fail Comparator and Low-Line Indicator for to maintain data or low-power operation for memo- Monitoring Voltages Down to 0.6V ries, real-time clocks (RTCs), and other digital logic Battery-On, Battery-OK, and Battery Test when the main power is removed. Indicators 3) Provide memory write protection through internal Small 10-Pin TDFN or 16-Pin TQFN Packages chip-enable gating during brownout. UL -Certified to Conform to IEC 60950-1 4) Provide a combination of additional supervisory functions listed in the Features section. Ordering Information The MAX16016/MAX16020/MAX16021 operate from a PART TEMP RANGE PIN-PACKAGE 1.53V to 5.5V supply voltage and offer fixed reset MAX16016 TB +T -40C to +85C 10 TDFN-EP* thresholds for monitoring 5V, 3.3V, 3V, 2.5V, and 1.8V The first placeholder designates all output options. Letter systems. Each device is available with either a push- L indicates push-pull outputs and letter P indicates open- pull or open-drain reset output. drain outputs. The last placeholder designates the reset The MAX16016/MAX16020/MAX16021 are available in threshold (see Table 1). small TDFN/TQFN packages and are fully specified for T = Tape and reel. an operating temperature range of -40C to +85C. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Applications Ordering Information continued at end of data sheet. Selector Guide located at end of data sheet. Main/Backup Power for RTCs, CMOS Memories Industrial Control Pin Configurations GPS Systems TOP VIEW Set-Top Boxes Point-of-Sale Equipment 16 15 14 13 BATT 1 + 12 RESET Portable/Battery Equipment MR 2 11 GND MAX16020 PFI 3 10 PFO EP WDI 4 9 WDO 5 6 7 8 TQFN Pin Configurations continued at end of data sheet. UL is a registered trademark of Underwriters Laboratories, Inc. 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. LL V CC BATT TEST CEIN BATTOK CEOUT BATTON OUTLow-Power P Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating ABSOLUTE MAXIMUM RATINGS V , BATT, OUT, BATT TEST to GND.....................-0.3V to +6V Output Current CC OUT Short Circuit to GND Duration....................................10s RESET, RESET, PFO, BATTOK, WDO, BATTON, RESET, RESET, BATTON....................................................20mA BATT TEST, LL, (all open-drain) to GND.................-0.3V to +6V Continuous Power Dissipation (T = +70C) A RESET, RESET, BATTOK, WDO, BATTON, 10-Pin TDFN (derate 24.4mW/C above +70C) .......1951mW LL (all push-pull) to GND......................-0.3V to (V + 0.3V) OUT 16-Pin TQFN (derate 25mW/C above +70C) ..........2000mW WDI, PFI to GND.......................................-0.3V to (V + 0.3V) OUT Operating Temperature Range ...........................-40C to +85C CEIN, CEOUT to GND ..............................-0.3V to (V + 0.3V) OUT Junction Temperature......................................................+150C MR to GND .................................................-0.3V to (V + 0.3V) CC Storage Temperature Range .............................-65C to +150C Input Current Lead Temperature (soldering, 10s) .................................+300C V Peak Current.................................................................1A CC Soldering Temperature (reflow) V Continuous Current ...............................................250mA CC TDFN............................................................................+260C BATT Peak Current .......................................................500mA TQFN............................................................................+240C BATT Continuous Current ...............................................70mA 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) TDFN TQFN Junction-to Ambient Thermal Resistance ( ) ...........41C/W Junction-to Ambient Thermal Resistance ( ) ...........40C/W JA JA Junction-to Case Thermal Resistance ( ) ..................9C/W Junction-to Case Thermal Resistance ( ) ..................6C/W JC JC 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. ELECTRICAL CHARACTERISTICS (V = 1.53V to 5.5V, V = 3V, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) CC BATT A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range (Note 3) V V V or V > V 0 5.5 V CC, BATT CC BATT TH V = 1.62V 1.2 2 CC V = 2.8V 1.9 3 CC Supply Current I V > V A CC CC TH V = 3.6V 2.3 3.5 CC V = 5.5V 3.4 5 CC Supply Current in I V = 0V 0.25 0.5 A BATT CC Battery-Backup Mode 0.1 V Switchover Threshold Voltage V rising, V - V V CC CC CC BATT x V CC BATT Switchover Threshold V falling, V < V , V - V 0mV CC CC TH CC BATT Voltage BATT Standby Current V > V + 0.2V -10 +10 nA CC BATT BATT Freshness Leakage Current V = 5.5V 20 nA BATT V = 4.75V, I = 150mA 1.4 4.5 CC OUT V = 3.15V, I = 65mA 1.7 4.5 CC OUT V to OUT On-Resistance R CC ON V = 2.35V, I = 25mA 2.1 5.0 CC OUT V = 1.91V, I = 10mA 2.6 5.5 CC OUT V = 4.5V, I = 20mA V - 0.1 Output Voltage in BATT OUT BATT V V OUT Battery-Backup Mode V = 2.5V, I = 20mA V - 0.15 BATT OUT BATT 2 MAX16016/MAX16020/MAX16021