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MAX6442UTC Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6442UTC Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page General Description The MAX6439–MAX6442 are a family of ultra-low-power battery monitors with integrated microprocessor (µP) supervisors. The battery monitors are offered with sin- gle or dual low-battery output options that can be used to signal when the battery is OK (enabling full system operation), when the battery is low (for low-power sys- tem operation), and when the battery is dead (to dis- able system operation). These devices also have an independent µP supervisor that monitors VCC and pro- vides an active-low reset output. A manual reset func- tion is available to reset the µP with a push-button. No external components are required. The MAX6439–MAX6442 are offered with several facto- ry-trimmed low-battery threshold combinations ideal for single-cell lithium-ion (Li+) or multicell alkaline/NiCd/ NiMH applications. When the battery voltage drops below each specified low threshold, the low-battery out- puts are asserted to alert the system. When the voltage rises above the specified high thresholds, the outputs are deasserted after a 150ms minimum timeout period, ensuring the voltages have stabilized before power cir- cuitry is activated or providing microprocessor reset tim- ing. The low and high thresholds provide hysteresis in battery-operated systems to eliminate output chattering. The MAX6439/MAX6440 offer factory-trimmed battery monitors with a single output. The MAX6441/MAX6442 offer factory-trimmed battery monitors with dual outputs. All battery monitors have open-drain low-battery outputs. The MAX6439–MAX6442 monitor system voltages (VCC) from 1.8V to 3.3V with seven fixed reset threshold options. Each device is offered with two minimum reset timeout periods of 150ms or 1200ms. The MAX6439/ MAX6441 are offered with an open-drain RESET output and the MAX6440/MAX6442 are offered with a push- pull RESET output. The MAX6439–MAX6442 are offered in a SOT23 pack- age and are fully specified over a -40°C to +85°C temp- erature range. Applications Battery-Powered Systems (Single-Cell Li+ or Two-/Three-Cell NiMH, NiCd, Alkaline) Cell Phones/Cordless Phones Portable Medical Devices Electronic Toys Pagers PDAs MP3 Players Features o Factory-Trimmed VBATT Threshold Options for Monitoring Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH Applications o Immune to Short Battery Voltage Transients o Low Current (2.5µA typ at 3.6V) o Single and Dual Low-Battery Output Options o 150ms Minimum LBO Timeout Period o Independent µP Reset with Manual Reset o Factory-Set Reset Thresholds for Monitoring VCC from 1.8V to 3.3V o Available with 150ms (min) and 1.2s (min) VCC Reset Timeout Period Options o -40°C to +85°C Operating Temperature Range o Small 6- and 8-Pin SOT23 Packages o No External Components Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset ________________________________________________________________ Maxim Integrated Products 1 MR RESET LBO 16 VCC 5 GND VBATT MAX6439 MAX6440 SOT23-6 TOP VIEW 2 34 Pin Configurations Ordering Information 19-2535; Rev 0; 7/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MAX6439UT_ _ _D_-T -40°C to +85°C 6 SOT23-6 MAX6440UT_ _ _D_-T -40°C to +85°C 6 SOT23-6 MAX6441KA_ _ _D_-T -40°C to +85°C 8 SOT23-8 MAX6442KA_ _ _D_-T -40°C to +85°C 8 SOT23-8 Note: The first two “_ _” are placeholders for the battery moni- tor voltage levels. Desired threshold levels are set by the part number suffix found in Tables 1 and 2. The third “_” is the VCC reset threshold level suffix found in Table 3. The “_” after the D is a placeholder for the reset timeout period suffix found in Table 4. All devices are available in tape-and-reel only. There is a 2500-piece minimum order increment for standard ver- sions. Sample stock is typically held on standard versions only. Nonstandard versions require a minimum order increment of 10,000 pieces. Contact factory for availability. Pin Configurations continued at end of data sheet. |
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