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BQ24192 Datasheet(PDF) 8 Page - Texas Instruments |
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BQ24192 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 46 page bq24190, bq24192 bq24192I, bq24193 SLUSAW5A – JANUARY 2012 – REVISED OCTOBER 2012 www.ti.com PIN FUNCTIONS (continued) PIN TYPE DESCRIPTION NAME NO. TS1 11 I Temperature qualification voltage input #1. Connect a negative temperature coefficient thermistor. Program temperature window with a resistor divider from REGN to TS1 to GND. Charge suspends when either TS pin is out of range. Analog Recommend 103AT-2 thermistor. TS1 and TS2 pins have to be shorted together in bq24193. TS2 12 I Temperature qualification voltage input #2. Connect a negative temperature coefficient thermistor. Program temperature window with a resistor divider from REGN to TS2 to GND. Charge suspends when either TS pin is out of range. Analog Recommend 103AT-2 thermistor. TS1 and TS2 pins have to be connected together in bq24193. BAT 13,14 P Battery connection point to the positive terminal of the battery pack. The internal BATFET is connected between BAT and SYS. Connect a 10uF closely to the BAT pin. SYS 15,16 P System connection point. The internal BATFET is connected between BAT and SYS. When the battery falls below the minimum system voltage, switch-mode converter keeps SYS above the minimum system voltage. (Refer to Application Information Section for inductor and capacitor selection) PGND 17,18 P Power ground connection for high-current power converter node. Internally, PGND is connected to the source of the n- channel LSFET. On PCB layout, connect directly to ground connection of input and output capacitors of the charger. A single point connection is recommended between power PGND and the analog GND near the IC PGND pin. SW 19,20 O Switching node connecting to output inductor. Internally SW is connected to the source of the n-channel HSFET and the drain of the n-channel LSFET. Connect the 0.047µF bootstrap capacitor from SW to BTST. Analog BTST 21 P PWM high side driver positive supply. Internally, the BTST is connected to the anode of the boost-strap diode. Connect the 0.047µF bootstrap capacitor from SW to BTST. REGN 22 P PWM low side driver positive supply output. Internally, REGN is connected to the cathode of the boost-strap diode. For VBUS above 6V, connect 1-µF ceramic capacitor from REGN to analog GND. For VBUS below 6V, connect a 4.7- μF (10V rating) ceramic capacitor from REGN to analog GND. The capacitor should be placed close to the IC. REGN also serves as bias rail of TS1 and TS2 pins. PMID 23 O Connected to the drain of the reverse blocking MOSFET and the drain of HSFET. Given the total input capacitance, connect a 1-µF capacitor on VBUS to PGND, and the rest all on PMID to PGND. (Refer to Application Information Section Analog for details) PowerPAD – P Exposed pad beneath the IC for heat dissipation. Always solder PowerPAD™ to the board, and have vias on the Power Pad plane star-connecting to PGND and ground plane for high-current power converter. ABSOLUTE MAXIMUM RATINGS VALUE VBUS –2 V – 20 V PMID, STAT, PG –0.3 V –20 V BTST –0.3 V – 26 V SW –2 V – 20 V Voltage range (with respect to GND) BAT, SYS (converter not switching) –0.3 V – 6 V SDA, SCL, INT, OTG, ILIM, REGN, TS1, TS2, CE, PSEL, D+, D– –0.3 V – 7 V BTST TO SW –0.3 V – 7 V PGND to GND –0.3 V – 0.3 V Output sink current INT, STAT, PG 6mA Junction temperature –40°C to 150°C Storage temperature –65°C to 150°C RECOMMENDED OPERATING CONDITIONS MIN MAX UNIT VIN Input voltage 3.9 17(1) V IIN Input current 3 A ISYS Output current (SYS) 4.5 A VBAT Battery voltage 4.4 V (1) The inherent switching noise voltage spikes should not exceed the absolute maximum rating on either the BTST or SW pins. A tight layout minimizes switching noise. 8 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: bq24190 bq24192 bq24192I bq24193 |
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