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BQ24721RHBTG4 Datasheet(PDF) 10 Page - Texas Instruments |
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BQ24721RHBTG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 60 page www.ti.com bq24721, bq24721C SLUS683C – NOVEMBER 2005 – REVISED DECEMBER 2006 ELECTRICAL CHARACTERISTICS (continued) 8 Vdc ≤ V (VCC) ≤ 24 Vdc, 0°C ≤ TJ ≤ 125°C, all voltages with respect to AGND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PWM HIGH-SIDE N-Channel MOSFET DRIVER (HIDRV), bq24721 R(DS_HIDRV) Hi High-side on-state resistance HSD switch on, HIDRV = HI, V(BOOST,PH) = 5.5 V 2.2 3 Ω R(DS_HIDRV) Lo High-side off-state resistance HSD switch off, HIDRV = LO, V(BOOST,PH) = 5.5 V 1.5 2.5 Ω PWM HIGH-SIDE N-Channel MOSFET DRIVER (HIDRV), bq24721C R(DS_HIDRV) Hi High-side on-state resistance HSD switch on, HIDRV = HI, V(BOOST,PH) = 5.5 V 4.5 8.6 Ω R(DS_HIDRV) Lo High-side off-state resistance HSD switch off, HIDRV = LO, V(BOOST,PH) = 5.5 V 1.5 2.6 Ω PWM LOW-SIDE N-Channel MOSFET DRIVER (LODRV), bq24721 R(DS_LODRV) Hi Low-side on-state resistance LSD switch on, LODRV = HI, V(PVCC) = 7 V 2.2 3 Ω R(DS_LODRV) Lo Low-side off-state resistance LSD switch off, LODRV = LO, V(PVCC) = 7 V 1.5 2.5 Ω PWM LOW-SIDE N-Channel MOSFET DRIVER (LODRV), bq24721C R(DS_LODRV) Hi Low-side on-state resistance LSD switch on, LODRV = HI, V(PVCC) = 7 V 4.5 8.6 Ω R(DS_LODRV) Lo Low-side off-state resistance LSD switch off, LODRV = LO, V(PVCC) = 7 V 1.5 2.6 Ω PWM LOW-SIDE DRIVER REGULATOR (REGN) V(REGN) at I(REGN) = 10 mA, sourcing, 5.5 6 6.5 V Adapter detected (V(ACDET) > V(ACD)), V(PVCC) > 7 V VO(HREGN) REGN output voltage V(REGN) at I(REGN) = 10 mA, sourcing, 4.2 V Adapter not detected, (V(ACDET) < V(ACD)), V(PVCC) > 7 V 2 times 25 nC load, fs = 300 kHz 15 mA REGN output current while charger IO(REGN_SW) switching 2 times 25 nC load, fs = 500 kHz 25 mA VREGN = 5 V 100 mA Adapter detected (V(ACDET) > V(ACD)), V(PVCC)> 7 V REGN Current limit I(REGN_LIM) Adapter detected VREGN = 0 V, shorted 13.3 mA Adapter detected (V(ACDET) > V(ACD)), V(PVCC)> 7 V REGN Current limit VREGN = 4.2 V 15 mA Adapter not detected Adapter not detected, (V(ACDET) < V(ACD)), V(PVCC)> 7 V PWM DRIVERS TIMING Dead time when switching between LSD and HSD, no load at LSD and 30 ns HSD PWM OSCILLATOR PWM oscillator ramp voltage , low V(RAMPLO) 0% duty cycle occurs below this threshold 0.35 V value PWM oscillator ramp voltage , high V(RAMPHI) near 100% duty cycle occurs above this threshold 3 V value VPP(RAMP) PWM ramp peak-to-peak amplitude 0.1 ×VCC V V(RAMPCL) PWM oscillator ramp clamp voltage 3.5 V FS PWM oscillator frequency (300 kHz) 265 300 345 kHz PWM oscillator frequency (500 kHz) 425 500 575 kHz INTERNAL SOFT START (8 steps to Ireg) SRSET pin voltage number of steps Eight steps of charge current regulation to get to programmed value 8 step during soft start. (SRSET = 1 V). Eight steps of charge current regulation to get to programmed value Step Duration. 0.8 1 1.2 ms/step (SRSET = 1 V). CHARGER SECTION POWER-UP SEQUENCING Time delay between power up of charger block references (first) and 1 ms start charge (second) Time delay from adapter detected until ACDRV enable and charger 500 ms block enable 10 Submit Documentation Feedback |
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