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BQ24081EVM Datasheet(PDF) 2 Page - Texas Instruments |
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BQ24081EVM Datasheet(HTML) 2 Page - Texas Instruments |
2 / 10 page www.ti.com 1.2 Background 1.3 Performance Specification Summary 2 Test Summary 2.1 Test Setup 2.2 Test Procedure P =(V -V ) MAX (DC+) (BAT+) (CHG) xI (1) Test Summary The bq24081 is a highly integrated and flexible Li-Ion linear charge device targeted at space-limited charger applications. It offers an integrated power FET and current sensor, high-accuracy current and voltage regulation, charge status, and charge termination, in a single monolithic device. An external resistor sets the magnitude of the charge current. The bq24081 charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The bq24081 automatically restarts the charge if the battery voltage falls below an internal threshold. The bq24081 automatically enters sleep mode when the input supply is removed. SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT VI(DC) Supply voltage range V(REG) + 0.5 5 5.5 V IO(CHG) Battery charge current(1) 0.7 1 A Power dissipation I(CHG) x (V(DC+) - V(BAT+)) 1.5 W (1) This input voltage maximum is a function of the maximum allowable power dissipation on the device. The current level is programmed for 0.7 A. If the programmed charge is changed, then the maximum input voltage needs to be adjusted. PMAX(IC) = 1.5 W = I(CHG) (V(DC+) – V(BAT+)). The device has a maximum recommended operation of 6.5 Vdc. This section shows the test setups used, and the tests performed, in evaluating the EVM. See the bq24081 datasheet (SLUS687) for complete details on operation and specifications for the charger device. The bq24081 EVM board requires a regulated 5-Vdc, 1-A power source, to provide input power and a single-cell Li-Ion or Li-Pol battery pack. The test setup connections and jumper setting selections are configured for a stand-alone evaluation but can be changed to interface with external hardware such as a microcontroller. Table 1. I/O and Jumper Connections(1) Jack CONNECTION J1–DC+ Power supply positive connection, preset to 5.0-VDC, 1.2-A current limit. J1–DC- Power supply return connection, ground J2–BAT+ Positive battery pack terminal J2–BAT- Negative battery pack terminal, BAT–, is common with DC– No connection – R4 is set to 10 k Ω to bias the TS signal in a charging state (bq24081). See datasheet J2–TS (SLUS687) to activate TS for bq24081. Connector provides for optional external control. J2–BAT- Return for thermistor (when used) JMP1–STAT1 Monitor JMP1-2 for STAT1, or apply a shunt across JMP1 for LED status. JMP2–STAT2 Monitor JMP2-2 for STAT2, or apply a shunt across JMP2 for LED status. JMP3–TE No jumper => Termination Enabled. Place a shunt on JMP3 to disable termination. (1) Factory jumper selections are shown in BOLD. Setup the evaluation board as described above, by making the necessary I/O connections and jumper selections. Prior to test and evaluation, it is important to verify that the maximum power dissipation on the device is not exceeded: PMAX = 1.5 W. 2 bq24081EVM 1-A Single-Chip Li-Ion and Li-Pol Charge SLUU261 – September 2006 Management IC Evaluation Module Submit Documentation Feedback |
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