MAX6846MAX6849 19-2947 Rev 1 11/05 Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated P Reset General Description Features The MAX6846MAX6849 are a family of ultra-low-power User-Adjustable Thresholds for Monitoring battery monitors with integrated microprocessor (P) Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH supervisors. The user-adjustable battery monitors are Applications offered with single or dual low-battery output options that Single and Dual Low-Battery Output Options can be used to signal when the battery is OK (enabling full system operation), when the battery is low (for low- Independent P Reset with Manual Reset power system operation), and when the battery is dead Factory-Set Reset Thresholds for Monitoring 1.8V (to disable system operation). These devices also have an independent P supervisor that monitors V and CC to 3.3V Systems provides an active-low reset output. A manual reset Available with 150ms (min) or 1.2s (min) V CC function is available to reset the P with a pushbutton. Reset Timeout Period Options The MAX6846MAX6849 are ideal for single-cell lithium- 150ms (min) LBO Timeout Period ion (Li+) or multicell alkaline/NiCd/NiMH applications. When the battery voltage drops below each adjusted low Immune to Short-Battery Voltage Transients threshold, the low-battery outputs are asserted to alert Low Current (2.5A, typ at 3.6V) the system. When the voltage rises above the adjusted high thresholds, the outputs are deasserted after a -40C to +85C Operating Temperature Range 150ms minimum timeout period, ensuring the voltages Small 8-Pin SOT23 Packages have stabilized before power circuitry is activated or pro- viding microprocessor reset timing. Ordering Information These devices have user-adjustable battery threshold voltages, providing a wide hysteresis range to prevent PART TEMP RANGE PIN-PACKAGE chattering that can result due to battery recovery after MAX6846KA D -T -40C to +85C 8 SOT23-8 load removal. Single low-battery outputs are supplied by the MAX6846/MAX6847 and dual low-battery out- MAX6847KA D -T -40C to +85C 8 SOT23-8 puts are supplied by the MAX6848/MAX6849. All bat- MAX6848KA D -T -40C to +85C 8 SOT23-8 tery monitors have open-drain low-battery outputs. MAX6849KA D -T -40C to +85C 8 SOT23-8 The MAX6846MAX6849 monitor system voltages Note: The first is the V reset threshold level, suffix found CC (V ) from 1.8V to 3.3V with seven fixed reset threshold CC in Table 1. The after the D is a placeholder for the reset options. Each device is offered with two minimum reset timeout period suffix found in Table 2. All devices are available timeout periods of 150ms or 1200ms. The MAX6846/ in tape-and-reel only. There is a 2500 piece minimum order MAX6848 are offered with an open-drain RESET output increment for standard versions (see Standard Versions table). Sample stock is typically held on standard versions only. Non- and the MAX6847/MAX6849 are offered with a push- standard versions require a minimum order increment of pull RESET output. 10,000 pieces. Contact factory for availability. The MAX6846MAX6849 are offered in a SOT23 pack- Devices are available in both leaded and lead-free packaging. age and are fully specified over a -40C to +85C temp- Specify lead-free by replacing -T with +T when ordering. erature range. Applications Pin Configurations Battery-Powered Systems (Single-Cell Li+ or Multicell NiMH, NiCd, Alkaline) TOP VIEW Cell Phones/Cordless Phones Portable Medical Devices V 1 8 V V 1 8 V DD CC DD CC Digital Cameras GND 2 7 HTHIN GND 2 7 HTHIN MAX6846 MAX6848 Pagers LTHIN 3 MAX6847 6 MR LTHIN 3 MAX6849 6 LBOH PDAs LBO 4 5 RESET LBOL 4 5 RESET MP3 Players SOT23 SOT23 Electronic Toys Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated P Reset ABSOLUTE MAXIMUM RATINGS V , V to GND....................................................-0.3V to +6V* Continuous Power Dissipation (T = +70C) DD CC A Open-Drain LBO, LBOH, LBOL to GND .................-0.3V to +6V* 8-Pin SOT23 (derate 8.9mW/C above +70C)............714mW Open-Drain RESET to GND ....................................-0.3V to +6V* Operating Temperature Range .......................... -40C to +85C Push-Pull RESET to GND............................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC HTHIN, LTHIN to GND................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C DD MR to GND .................................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC Input/Output Current, All Pins .............................................20mA *Applying 7V for a duration of 1ms does not damage the device. 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 = 1.6V to 5.5V, V = 1.2V to 5.5V, T = -40C to +85C, unless otherwise specified. Typical values are at T = +25C.) (Note 1) DD CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V Operating Voltage Range V 1.6 V DD DD T = 0C to +85C 1.0 5.5 A V Operating Voltage Range V V CC CC T = -40C to +85C 1.2 5.5 A V + V Supply Current I + I V = 3.6V, V = 3.3V, no load (Note 2) 2.5 7 A CC DD CC DD DD CC MAX6846/MAX6847 V THRESHOLDS DD HTHIN rising, LBO is deasserted when HTHIN Threshold V 600 615 630 mV HTH HTHIN rises above V HTH LTHIN falling, LBO is asserted when LTHIN LTHIN Threshold V 600 615 630 mV LTH falls below V LTH MAX6848/MAX6849 V THRESHOLDS DD HTHIN rising, LBOH is deasserted when HTHIN+ Threshold V 600 615 630 mV HTH+ HTHIN rises above V HTH+ HTHIN falling, LBOH is asserted when HTHIN- Threshold V 567 582 597 mV HTH- HTHIN falls below V HTH- LTHIN rising, LBOL is deasserted when LTHIN+ Threshold V 600 615 630 mV LTH+ LTHIN rises above V LTH+ LTHIN falling, LBOL is asserted when LTHIN- Threshold V 567 582 597 mV LTH- LTHIN falls below V LTH- MAX6846MAX6849 HTHIN/LTHIN Leakage Current I V or V 400mV 20 nA LKG HTHIN LTHIN LBO , LBO L, LBOH Tim eout Per i od t HTHIN/LTHIN rising above threshold 150 225 300 ms LBOP LBO, LBOL, LBOH Delay Time t HTHIN/LTHIN falling below threshold 100 s LBOD (V or V ) 1.2V, I = 50A, asserted DD CC SINK 0.3 low (V or V ) 1.6V, I = 100A, DD CC SINK 0.3 asserted low LBO, LBOL, LBOH Output Low V V OL (V or V ) 2.7V, I = 1.2mA, DD CC SINK 0.3 asserted low (V or V ) 4.5V, I = 3.2mA, DD CC SINK 0.3 asserted low 2 MAX6846MAX6849