BQ24171 Datasheet, PDF (11/35 Pages) Texas Instruments – JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer Battery Charger with Integrated MOSFETs and Power Path Selector

bq24171
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SLUSAF2A – FEBRUARY 2011 – REVISED MAY 2011
ELECTRICAL CHARACTERISTICS (continued)
4.5V ≤ V(PVCC, AVCC) ≤ 17V, –40°C < T_J + 125°C, typical values are at T_A = 25°C, with respect to AGND (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNITS
BATTERY DETECTION
t_WAKE
I_WAKE
t_DISCHARGE
I_DISCHARGE
I_FAULT
V_WAKE
Wake timer
Wake current
Discharge timer
Discharge current
Fault current after a timeout fault
Wake threshold with respect to V_REG To
detect battery absent during WAKE
Max time charge is enabled
R_SENSE = 10 mΩ
Max time discharge current is applied
Measure on FB
500
ms
50
125
200 mA
1
sec
8
mA
2
mA
50
mV
V_DISCH
Discharge Threshold to detect battery
absent during discharge
Measure on FB
1.45
V
INTERNAL PWM
fsw
PWM Switching Frequency
1360
1600 1840 kHz
t_{SW_DEAD}
Driver Dead Time⁽⁵⁾
Dead time when switching between LSFET and
HSFET no load
30
ns
R_{DS_HI}
R_{DS_LO}
V_{BTST_REFRESH}
High Side MOSFET On Resistance
Low Side MOSFET On Resistance
Bootstrap Refresh Comparator Threshold
Voltage
INTERNAL SOFT START (8 steps to regulation current ICHG)
V_BTST – V_SW = 4.5 V
V_BTST – V_SW when low side refresh pulse is
requested, V_AVCC=4.5V
V_BTST – V_SW when low side refresh pulse is
requested, V_AVCC>6V
25
45 mΩ
60
110 mΩ
3
V
4
SS_STEP
Soft start steps
8
step
T_{SS_STEP}
Soft start step time
CHARGER SECTION POWER-UP SEQUENCING
1.6
3 ms
t_{CE_DELAY}
Delay from ISET above 120mV to start
charging battery
1.5
s
INTEGRATED BTST DIODE
V_F
Forward Bias Voltage
V_R
Reverse breakdown voltage
LOGIC IO PIN CHARACTERISTICS
I_F=120mA at 25°C
I_R=2uA at 25°C
0.85
V
20
V
V_{OUT_LO}
STAT Output Low Saturation Voltage
Sink Current = 5 mA
0.5
V
(5) Specified by design
Copyright © 2011, Texas Instruments Incorporated
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