BQ24721 Datasheet, PDF (4/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

bq24721
SLUS683 – NOVEMBER 2005
www.ti.com
ELECTRICAL CHARACTERISTICS
8 Vdc ≤ V_(VCC) ≤ 24 Vdc, 0°C ≤ T_J ≤ 125°C, all voltages with respect to AGND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
BATTERY VOLTAGE REGULATION
VBAT_ICR
VBAT Input voltage range
V(BAT)
Battery Regulation Voltage Accuracy
Full valid voltage DAC range,
SMBus DAC register 0×15
V(VBATREG)
BAT voltage regulation range
PWM AC ADAPTER INPUT CURRENT REGULATION, DPM (Dynamic Power Management)
TJ = 0°C – 85°C
TJ = 0°C – 125°C
0
–0.4
–0.5
9
V(IREG_DPM)
ACP-ACN differential voltage range
for input current regulation
V(IREG_DPM) = V(ACP)- V(ACN)
SMBus DAC register 0×3F, bits b0–b13
1.28
I(REG_step_DPM)
Current regulation LSB programming V(ACP-ACN) / 10mΩ
current step
Using a 10mΩ sense resistor, R(SNS)
VCC ≥ VCC (min),
V(ACP) – V(ACN) > 40.96 mV
(4096 mA with 10 mΩ)
–3
Current regulation accuracy
VCC ≥ VI(BAT) + V(DO-MAX), ⁽¹⁾
Over differential threshold range, V(IREG),
Does not include error induced by the
V(ACP) – V(ACN) > 20.48 mV
(2048 mA with 10 mΩ)
–5
tolerance of the sense resistor, R(SNS)
V(ACP) – V(ACN) > 5.12 mV
(512 mA with 10 mΩ)
–25
PWM BATTERY CHARGE CURRENT REGULATION
V(IREG_CHG)
SRP-SRN differential voltage range
for input current regulation
V(IREG_CHG) = V(SRP)- V(SRN)
SMBus DAC register 0×14, bits b0–b13
1.28
I(REG_step_CHG)
Current regulation LSB programming V(SRP-SRN) / 10 mΩ
current step
Using a 10mΩ sense resistor, R(SNS)
VCC ≥ VCC (min),
V(SRP-SRN) > 40.96 mV
(4096 mA with 10 mΩ)
–3
Current regulation accuracy
VCC ≥ VI(BAT) + V(DO-MAX), ⁽¹⁾
Over differential threshold range, V(IREG),
Does not include error induced by the
V(SRP-SRN) >20.48 mV
(2048 mA with 10 mΩ)
–5
tolerance of the sense resistor, R(SNS)
V(SRP-SRN) > 5.12 mV
(512 mA with 10 mΩ)
–25
CHARGE CURRENT AMPLIFIER – IBAT AMPLIFIER and IADAPT AMPLIFIER → MUX TO IOUT
SRP, SRN common-mode input
voltage range
2.5
V(IOUT_IBAT)
IOUT output voltage range with IBAT V(IOUT) = V(SRP, SRN)× A(IBAT)
selected
V(BAT) > 2.5 V or V(BAT) > V(IOUT) + V(DO-MAX)(1)
0
A(IBAT)
Voltage gain
A(IOUT) = V(IOUT)/ V(SRP, SRN)
Charge current amplifier accuracy
V(BAT) > 2.5 V or V(BAT) >
V(IOUT) + V(DO-MAX)(1)
V(SRP, SRN) = 40 mV and higher
–2
V(SRP, SRN) = 20 mV and higher
–3
V(SRP, SRN) = 5 mV and higher
–25
ACP, ACN Common-mode input
voltage range
0
V(IOUT_IADAPT)
IOUT output voltage range with
IADAPT selected
V(IOUT) = V(ACP, ACN)× A(IADP)
V(SRP) > 2.5 V or V(SRP) > V(IOUT) + 1V
0
A_(IADP)
Voltage gain
A_(IADP) = V_(IOUT)/ V_{(ACP, ACN)}
Adapter current amplifier accuracy
V(BAT) > 2.5 V or V(BAT) >
V(IOUT) + V(DO-MAX)(1)
V(ACP, ACN) = 40 mV and higher
–2
V(ACP, ACN) = 30 mV and higher
–3
V(ACP, ACN) = 5 mV and higher
–25
I(OUT_LIM)
IOUT output current limit
IOUT shorted to AGND
4.5
TYP
MAX
PVCC
0.4
0.5
19.2
162.56
128
3
5
25
162.56
128
3
5
25
20
3.5
20
2
3
25
24
3.5
20
2
3
25
UNIT
V
%
%
V
mV
mA
%
%
%
mV
mA
%
%
%
V
V
V/V
%
%
%
V
V
V/V
%
%
%
mA
(1) V_(DO-max) is defined as the maximum drop-out voltage. V_(DO-max)=1 V unless other wise specified. In an actual application, V_{(DO - MAX)} =
(R_(SNS) * I_O) + V_{(DSON_HIGH_SIDE_FET)} + V_{(DSON_BYPASS_FET)}.
4