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MAX6433UK-T Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6433UK-T Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page General Description The MAX6427–MAX6438 are single/dual-level battery mon- itors with internal hysteresis. These devices are offered with single (MAX6427/MAX6428/MAX6429, MAX6433/ MAX6434/MAX6435) or dual (MAX6430/MAX6431/ MAX6432, MAX6436/MAX6437/MAX6438) low-battery out- put indicators, which can be used to indicate three battery conditions: battery is good (operate system in normal mode), battery is weak (operate system in low-power mode), or battery is empty (disable the system). These devices are ideal for monitoring single lithium-ion (Li+) cells or multicell alkaline/NiCd/NiMH power supplies. When the power-supply voltage drops below the specified low threshold, the low-battery output asserts. When the voltage rises above the specified high threshold, the low- battery output is deasserted following a 140ms minimum timeout period. The timeout period ensures that the supply voltages have stabilized before power-converter or micro- processor activity is enabled. The MAX6427–MAX6438 family is available with several monitoring options. The MAX6427/MAX6428/MAX6429 offer factory-trimmed battery-monitor thresholds, with a sin- gle low-battery output. The MAX6430/MAX6431/MAX6432 also feature factory-trimmed thresholds, but have two low- battery outputs. The MAX6433–MAX6438 have user-adjustable threshold voltages permitting the user to select the hysteresis range, and consequently the sensitivity of the system to noise. A wide hysteresis range also prevents chattering that can result due to battery recovery after load removal. Single low-battery outputs are supplied by the MAX6433/ MAX6434/MAX6435 and dual low-battery outputs by the MAX6436/MAX6437/MAX6438. The MAX6427–MAX6438 family is available with three out- put logic options for convenient interface with system power circuitry or microprocessors. The family is offered in small SOT23 and SOT143 packages and is fully specified over temperature. ________________________Applications Battery-Powered Systems (Single-Cell Li+ or Two/Three-Cell NiMH, NiCd, Alkaline) Cell Phones/Cordless Phones Pagers Portable Medical Devices PDAs Electronic Toys MP3 Players Features ♦ Factory-Trimmed or User-Adjustable Threshold Options Factory-Trimmed Low Thresholds from 1.6V to 2.1V or 2.6V to 3.1V in 100mV Increments (MAX6427–MAX6432) Factory-Trimmed High Thresholds from 2.3V to 2.6V or 3.3V to 3.6V in 100mV Increments (MAX6427–MAX6432) User-Adjustable Low/High Thresholds with 615mV Internal Reference (MAX6433–MAX6438) ♦ Low Current (1µA, typ) ♦ Single or Dual Low-Battery Outputs ♦ Push-Pull LBO, Open-Drain LBO, and Open-Drain LBO Options ♦ 140ms Minimum LBO Timeout Period ♦ Immune to Short Battery Voltage Transients ♦ Guaranteed Valid LBO Logic State to BATT = 1.0V ♦ -40°C to +85°C Operating Temperature Range ♦ Small 3, 4, 5 and 6-Pin SOT Packages ♦ No External Components Required (MAX6427–MAX6432) Low-Power, Single/Dual-Level Battery Monitors with Hysteresis ________________________________________________________________ Maxim Integrated Products 1 19-2323; Rev 2; 12/05 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. Ordering Information Typical Operating Circuit appears at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX6427_ _UR-T -40°C to +85°C 3 SOT23-3 Ordering Information continued at end of data sheet. Pin Configurations continued at end of data sheet. †The MAX6427–MAX6432 are available with factory-trimmed battery-monitor thresholds. Select the desired thresholds using Tables 1 or 2 and enter the corresponding letters in the part number by replacing “_ _”. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering. Note: There are 26 standard versions with a required order minimum of 2500 pieces. Sample stock is generally held on the standard versions only (see Standard Versions Table). Required order increment is 10,000 pieces for nonstandard versions. Contact factory for availability. All devices avail- able in tape-and-reel only. BATT 1 3 GND ( ) ARE FOR THE MAX6429. MAX6427 MAX6428 MAX6429 SOT23-3 TOP VIEW 2 LBO (LBO) Pin Configurations |
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