BQ24742 Datasheet, PDF (7/35 Pages) Texas Instruments – Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

www.ti.com
bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
ELECTRICAL CHARACTERISTICS (continued)
9.0 V ≤ V_PVCC ≤ 24 V, 0°C < T_J < +125°C, F_s=600 kHz, typical values are at T_A = 25°C, with respect to AGND (unless
otherwise noted) ^{(1) (2) (3)}
PARAMETER
TEST CONDITIONS
INPUT CURRENT REGULATION
V_{IREG_DPM}
Adapter current regulation differential
voltage range
V_{IREG_DPM} = V_ACP – V_ACN
V_{ACSET_OP}
ACSET voltage range
Input current regulation accuracy
Off-set Voltage of Amplifier
V_{IREG_DPM} = 40 mV
V_{IREG_DPM} = 20 mV
V_{IREG_DPM} = 5 mV
V_{IREG_DPM} = 1.5 mV
VREF REGULATOR
V_{VREF_REG}
VREF regulator voltage
I_{VREF_LIM}
VREF short current limit
REGN REGULATOR
V_ACDET > 0.6 V, 0-30 mA
V_VREF = 0 V, V_ACDET > 0.6 V
V_{REGN_REG}
REGN regulator voltage
I_{REGN_LIM}
REGN short current limit
ADAPTER CURRENT SENSE AMPLIFIER
V_ACDET > 0.6 V, 0-75 mA, PVCC > 10 V
V_REGN = 0 V, V_ACDET > 0.6 V
V_{ACP/N_OP}
Input common mode range
Voltage on ACP/ACN
V_IADAPT
IADAPT output voltage range
I_IADAPT
IADAPT output current
A_IADAPT
Current sense amplifier voltage gain
A_IADAPT = V_IADAPT / V_{IREG_DPM}
V_{IREG_DPM} = 40 mV
Adapter current sense accuracy
V_{IREG_DPM} = 20 mV
V_{IREG_DPM} = 5 mV
V_{IREG_DPM} = 1.5 mV
I_{IADAPT_LIM}
Output short current limit
V_IADAPT = 0 V
C_{IADAPT_MAX}
Maximum output load capacitance
For stability with 0 mA to 1 mA load
ACDET COMPARATOR (INPUT UNDER_VOLTAGE, ACVGOOD)
V_{ACDET_CHG}
V_{ACDET_CHG_HYS}
ACDET adapter-detect rising threshold
ACDET falling hysteresis
ACDET rising deglitch to turn on EXTPWR
FET ⁽⁴⁾
Min voltage to enable charging, V_ACDET rising
V_ACDET falling, PVCC>8V
V_ACDET rising, PVCC>8V
T_{ACDET_EXTPWR}
ACDET rising deglitch to enable charge ⁽⁴⁾
ACDET falling deglitch to turn off EXTPWR
FET ⁽⁴⁾
ACDET falling deglitch to disable charge⁽⁴⁾
Power-up delay from V_ACDET>2.4V to
EXTPWR FET turn-on⁽⁴⁾
V_ACDET rising, PVCC>8V, CE=HIGH
V_ACDET falling, PVCC>8V
V_ACDET falling, PVCC>8V
First time power up, F_s = 300 kHz – 800 kHz
AC CURRENT DETECT COMPARATOR (INPUT UNDER_CURRENT, ACIGOOD)
V_ACIDET
V_{ACIDE_HYS}
Adapter current detect falling threshold
Adapter current detect hysteresis
Adapter current detect deglitch
V_ACI = 20 X I_AC x R_AC, falling edge
Rising edge
IADAPT rising
IADAPT falling
MIN TYP MAX
0
0
–3%
–5%
–25%
–33%
-500
100
VDAC
3%
5%
25%
33%
500
3.267
35
3.3 3.333
80
5.6 5.9
6.2
90
145
0
0
0
–2%
–4%
–25%
–33%
1
24
2
1
20
2%
4%
25%
33%
100
2.376 2.40 2.424
40
1.2
333
80
80
2
200 250
300
50
10
10
(4) Verified by design
UNIT
mV
V
μV
V
mA
V
mA
V
mA
V/V
mA
pF
V
mV
ms
ms
μs
μs
ms
mV
mV
μs
μs
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s) :bq24741 bq24742
Submit Documentation Feedback
7