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BQ24721RHBTG4 Datasheet(PDF) 10 Page - Texas Instruments

Part # BQ24721RHBTG4
Description  ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ24721RHBTG4 Datasheet(HTML) 10 Page - Texas Instruments

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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
R(DS_HIDRV) Lo
High-side off-state resistance
HSD switch off, HIDRV = LO, V(BOOST,PH) = 5.5 V
1.5
2.5
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
R(DS_HIDRV) Lo
High-side off-state resistance
HSD switch off, HIDRV = LO, V(BOOST,PH) = 5.5 V
1.5
2.6
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
R(DS_LODRV) Lo
Low-side off-state resistance
LSD switch off, LODRV = LO, V(PVCC) = 7 V
1.5
2.5
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
R(DS_LODRV) Lo
Low-side off-state resistance
LSD switch off, LODRV = LO, V(PVCC) = 7 V
1.5
2.6
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
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