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BQ24721RHBR Datasheet(PDF) 3 Page - Texas Instruments |
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BQ24721RHBR Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 60 page  www.ti.com bq24721, bq24721C SLUS683C – NOVEMBER 2005 – REVISED DECEMBER 2006 DEVICE INFORMATION (continued) TERMINAL FUNCTIONS (continued) TERMINAL DESCRIPTION NO. NAME Error amplifier input for compensation, also connect the feedback compensation components from EAI 8 EAI to EAO. Connect the input compensation components from FBO to EAI. See the compensation calculation procedures. Feedback output for compensation. Connect the input compensation components from FBO to EAI. 9 FBO Typically, a resistor in parallel with a series resistor and capacitor. See the compensation calculation procedures. Analog ground. Ground connection for low current sensitive analog and digital signals. Only connect to 10 AGND the PGND node by connecting to the PowerPAD™ underneath the IC. 5-V regulated voltage output, used for internal bias and the reference for programming the TS 11 VREF5 thermistor sense network. Used to indicate adapter present status. It is enabled by ac detected. Connect a 1- µF ceramic capacitor from VREF5 pin to AGND as close to IC as possible. IC analog positive supply. Connect to adapter input, or diode, or by putting a diode from adapter input 12 VCC and a diode from battery pack to VCC. Put a 1- µF ceramic capacitor from VCC to AGND, as close to the IC as possible. SMBus Data input. Connect to SMBus data line from the host controller. A 10-k Ω pullup resistor to the 13 SDA host controller supply rail is needed. SMBus Clock input. Connect to SMBus clock line from the host controller. A 10-k Ω pullup resistor to 14 SCL the host controller supply rail is needed. Thermistor sense input. Use a voltage divider from VREF5 to TS and AGND. Place a resistor from VREF to TS, and a resistor from TS to AGND to program the hot and cold battery pack thermistor 15 TS temperatures. Charge is disabled when outside the hot/cold window. The TS pin is also used to detect if a battery is connected. Program current threshold for synchronous to nonsynchronous regulation transition. Place a resistor from ISYNSET to AGND to program the charge undercurrent threshold to force nonsynchronous 16 ISYNSET converter operation at low output current and prevent negative inductor current. Threshold should be set from ½ inductor current ripple to full value of inductor current ripple. Battery charger or adapter current amplifier output. Current sense amplifier that outputs a voltage 20x the current sense resistor differential voltage. The output can be selected by SMBus charge control 17 IOUT register (0x12) bit3 to be the input adapter current (ACP-ACN), or the battery charge current (SRP-SRN). Place a 0.1- µF capacitor from IOUT to AGND for filtering the output ripple. Optionally, add an RC filter after the output filter for further filtering. Battery voltage remote sense. Directly connect a kelvin sense trace from the battery pack positive 18 BAT terminal to the BAT pin to accurately sense the battery pack voltage. Place a 0.1- µF capacitor from BAT to AGND close to the IC to filter high frequency noise. Charge current sense resistor, negative input. Connect to the charge current sense resistor negative 19 SRN terminal. Optionally, add a 0.1- µF ceramic capacitor from SRN to AGND near the IC for common-mode filter. Charge current sense resistor, positive input. Connect to the charge current sense resistor positive terminal. Recommend placing a 0.1- µF ceramic capacitor from SRP to AGND near the IC for 20 SRP common-mode filter. Optionally, place a 0.1- µF ceramic capacitor from SRP to SRN near the IC for differential-mode filter. Charge overcurrent and charge undercurrent negative sense input. Connect to the charge current sense resistor negative terminal. If sensing the same sense resistor as SRN, the user can connect 21 SYNN directly to the SRN pin and no further filter capacitors are needed. To sense a different sense resistor, add a 0.1- µF ceramic capacitor from SYNN to AGND near the IC for common-mode filter. Charge overcurrent and charge undercurrent negative sense input. Connect to the charge current sense resistor positive terminal. If sensing the same sense resistor as SRP, the user can connect 22 SYNP directly to the SRP pin, and no further filter capacitors are needed. To sense a different sense resistor, add a 0.1- µF ceramic capacitor from SYNP to AGND near the IC for common-mode filter, and place a 0.1- µF ceramic capacitor from SYNP to SYNN near the IC for differential-mode filter. System load, voltage sense. Connect directly to the system load node and the drain of the BAT PMOS 23 SYS power FET. 3 Submit Documentation Feedback |
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