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BQ24088DRCRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ24088DRCRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 35 page FUNCTIONAL DESCRIPTION BatteryVoltage, V(BAT) Charge Complete Status, Charger Off VoltageRegulationand ChargeTermination Phase PRE-CHARGE CURRENT AND TERMINATION THRESHOLD BatteryCurrent, I(BAT) DONE DONE T(CHG) VO(REG) FAST-CHARGE CURRENT I I O(PRECHG), (TERM) IO(OUT) Current Regulation Phase Pre- Conditioning Phase v(LOWV) T(PRECHG) bq24085, bq24086 bq24087, bq24088 www.ti.com............................................................................................................................................. SLUS784D – DECEMBER 2007 – REVISED AUGUST 2009 The charge current is programmable using external components (RISET resistor). The charge process starts when an external input power is connected to the system, the charger is enabled by CE = LO and the battery voltage is below the recharge threshold, V(BAT) < V(RCH). When the charge cycle starts a safety timer is activated, if the safety timer function is enabled. The safety timer timeout value is set by an external resistor connected to TMR pin. When the charger is enabled two control loops modulate the battery switch drain to source impedance to limit the BAT pin current to the programmed charge current value (charge current loop) or to regulate the BAT pin voltage to the programmed charge voltage value (charge voltage loop). If V(BAT) < V(LOWV) (3 V typical) the BAT pin current is internally set to 10% of the programmed charge current value. A typical charge profile is shown below, for an operation condition that does not cause the IC junction temperature to exceed TJ(REG), (112°C typical). Figure 10. Charging Profile With TJ(REG) If the operating conditions cause the IC junction temperature to exceed TJ(REG), the charge cycle is modified, with the activation of the integrated thermal control loop. The thermal control loop is activated when an internal voltage reference, which is inversely proportional to the IC junction temperature, is lower than a fixed, temperature stable internal voltage. The thermal loop overrides the other charger control loops and reduces the charge current until the IC junction temperature returns to TJ(REG), effectively regulating the IC junction temperature. Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): bq24085, bq24086 bq24087, bq24088 |
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