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ACT8946AQJ203-T データシート(PDF) 30 Page - Active-Semi, Inc |
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ACT8946AQJ203-T データシート(HTML) 30 Page - Active-Semi, Inc |
30 / 37 page ACT8946AQJ203-T Rev 1.0, 08-Jul-16 ActivePMU and ActivePath are trademarks of Active-Semi. - 30 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. General Description The ACT8946A features an advanced battery charger that incorporates the patent-pending ActivePath architecture for system power selection. This combination of circuits provides a complete, advanced battery-management system that automatically selects the best available input supply, manages charge current to ensure system power availability, and provides a complete, high- accuracy (±0.5%), thermally regulated, full-featured single-cell linear Li+ charger that can withstand input voltages of up to 12V. ActivePath Architecture The ActivePath architecture performs three important functions: 1) System Configuration Optimization 2) Input Protection 3) Battery-Management System Configuration Optimization The ActivePath circuitry monitors the state of the input supply, the battery, and the system, and automatically reconfigures itself to optimize the power system. If a valid input supply is present, ActivePath powers the system from the input while charging the battery in parallel. This allows the battery to charge as quickly as possible, while supplying the system. If a valid input supply is not present, ActivePath powers the system from the battery. Finally, if the input is present and the system current requirement exceeds the capability of the input supply, ActivePath allows system power to be drawn from both the battery and the input supply. Input Protection Input Over-Voltage Protection The ActivePath circuitry features input over-voltage protection circuitry. This circuitry disables charging when the input voltage exceeds the voltage set by OVPSET[-] as shown in Table 6, but stands off the input voltage in order to protect the system. Note that the adjustable OVP threshold is intended to provide the charge cycle with adjustable immunity against upward voltage transients on the input, and is not intended to allow continuous charging with input voltages above the charger's normal operating voltage range. Independent of the OVPSET[-] setting, the charge cycle is not allowed to resume until the input voltage falls back into the charger's normal operating voltage range (i.e. below 6.0V). In an input over-voltage condition this circuit limits VVSYS to 4.6V, protecting any circuitry connected to VSYS from the over-voltage condition, which may exceed this circuitry's voltage capability. This circuit is capable of withstanding input voltages of up to 12V. Table 6: Input Over-Voltage Protection Setting Input Supply Overload Protection The ActivePath circuitry monitors and limits the total current drawn from the input supply to a value set by the ACIN and CHGLEV inputs, as well as the resistor connected to ISET. Drive ACIN to a logic- low for “USB Mode”, which limits the input current to either 100mA, when CHGLEV is driven to a logic- low, or 450mA, when CHGLEV is driven to a logic- high. Drive ACIN to a logic-high for “AC-Mode”, which limits the input current to 2A, typically. Input Under Voltage Lockout If the input voltage applied to CHGIN falls below 3.5V (typ), an input under-voltage condition is detected and the charger is disabled. Once an input under-voltage condition is detected, a new charge cycle will initiate when the input exceeds the under- voltage threshold by at least 500mV. Battery Management The ACT8946A features a full-featured, intelligent charger for Lithium-based cells, and was designed specifically to provide a complete charging solution with minimum system design effort. The core of the charger is a CC/CV (Constant- Current/Constant-Voltage), linear-mode charge controller. This controller incorporates current and voltage sense circuitry, an internal 70mΩ power MOSFET, thermal-regulation circuitry, a full- featured state machine that implements charge control and safety features, and circuitry that eliminates the reverse blocking diode required by conventional charger designs. The charge termination voltage is highly accurate (±0.5%), and features a selection of charge safety time-out periods that protect the system from operation with damaged cells. Other features include pin-programmable fast-charge current and one current-limited nSTAT output that can directly drive LED indicator or provide a logic-level status signal to the host microprocessor . Dynamic Charge Current Control (DCCC) The ACT8946A's ActivePath charger features dynamic charge current control (DCCC) circuitry, which acts to ensure that the system remains powered while operating within the maximum output capability of the power adapter. The DCCC circuitry continuously monitors VVSYS, and if the voltage at VSYS drops by more than 200mV, the DCCC ActivePath CHARGER OVPSET[1] OVPSET[0] OVP THRESHOLD 0 0 6.6V 0 1 7.0V 1 0 7.5V 1 1 8.0V |
同様の部品番号 - ACT8946AQJ203-T |
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同様の説明 - ACT8946AQJ203-T |
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