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MAX8725ETI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8725ETI Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 30 page General Description The MAX1909/MAX8725 highly integrated control ICs simplify construction of accurate and efficient multi- chemistry battery chargers. The MAX1909/MAX8725 use analog inputs to control charge current and volt- age, and can be programmed by a host microcontroller (µC) or hardwired. High efficiency is achieved through use of buck topology with synchronous rectification. The maximum current drawn from the AC adapter is pro- grammable to avoid overloading the AC adapter when supplying the load and the battery charger simultane- ously. The MAX1909/MAX8725 provide a digital output that indicates the presence of an AC adapter, and an analog output that monitors the current drawn from the AC adapter. Based on the presence or absence of the AC adapter, the MAX1909/MAX8725 automatically select the appropriate source for supplying power to the sys- tem by controlling two external p-channel MOSFETs. Under system control, the MAX1909/MAX8725 allow the battery to undergo a relearning or conditioning cycle in which the battery is completely discharged through the system load and then recharged. The MAX1909 includes a conditioning charge feature while the MAX8725 does not. The MAX1909/MAX8725 are available in space-saving 28-pin, 5mm ✕ 5mm thin QFN packages and operate over the extended -40°C to +85°C temperature range. The MAX1909/MAX8725 are now available in lead-free packages. Applications Notebook and Subnotebook Computers Hand-Held Data Terminals Features ♦ ±0.5% Accurate Charge Voltage (0°C to +85°C) ♦ ±3% Accurate Input Current Limiting ♦ ±5% Accurate Charge Current ♦ Programmable Charge Current >4A ♦ Automatic System Power-Source Selection ♦ Analog Inputs Control Charge Current and Charge Voltage ♦ Monitor Outputs for Current Drawn from AC Input Source AC Adapter Presence ♦ Up to 17.65V (max) Battery Voltage ♦ Maximum 28V Input Voltage ♦ Greater than 95% Efficiency ♦ Charge Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc. Multichemistry Battery Chargers with Automatic System Power Selector ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2805; Rev 2; 9/04 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. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN-PACKAGE MAX1909ETI -40 °C to +85°C 28 Thin QFN MAX1909ETI+ -40 °C to +85°C 28 Thin QFN MAX8725ETI -40 °C to +85°C 28 Thin QFN MAX8725ETI+ -40 °C to +85°C 28 Thin QFN 28 27 26 25 24 23 22 89 10 11 12 13 14 15 16 17 18 19 20 21 7 6 5 4 3 2 1 MAX1909 MAX8725 THIN QFN TOP VIEW LDO DCIN ACIN REF GND/PKPRES ACOK MODE DLOV DLO PGND CSIP CSIN BATT GND Pin Configuration CSSP CSSN LDO DHI DLOV DLO PGND CSIP CSIN BATT GND DCIN VCTL ICTL MODE ACIN ACOK CLS CCV CCI CCS REF LDO AC ADAPTER: INPUT P3 0.01Ω 10µH N1 P1 0.015Ω TO EXTERNAL LOAD LDO PDS PDL SRC LDO REF IINP IINP DHIV SRC P2 MAX1909 MAX8725 PKPRES MAX8725 ONLY Minimum Operating Circuit Functional Diagrams appear at end of data sheet. +Denotes lead-free package. |
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