BQ24618 Datasheet, PDF (8/36 Pages) Texas Instruments – Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger

bq24618
SLUSA55 – OCTOBER 2010
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
4.7V ≤ V(VCC) ≤ 28V, 0°C < T_J < +125°C, typical values are at T_A = 25°C, with respect to GND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
REGN REGULATOR
V_{REGN_REG}
REGN regulator voltage
I_{REGN_LIM}
REGN current limit
TTC INPUT AND SAFETY TIMER
T_PRECHG
Precharge safety timer range⁽¹⁾
T_CHARGE
Fast charge safety timer range, with +/-
10% accuracy⁽¹⁾
V_VCC > 10V, CE = HIGH, (0-40mA load)
V_REGN = 0V, V_VCC > V_UVLO, CE = HIGH
Precharge time before fault occurs
Tchg = C_TTC × K_TTC
5.7
6.0
6.3
V
40
mA
1440 1800 2160 sec
1
10 Hr
K_TTC
Fast charge timer accuracy⁽¹⁾
Timer multiplier
TTC low threshold
0.01 mF ≤ C_TTC ≤ 0.11 mF
–10%
V_TTC below this threshold disables the safety timer and
termination
10%
5.6
min/nF
0.4
V
TTC oscillator high threshold
1.5
V
TTC oscillator low threshold
1
V
TTC source/sink current
45
50
55 mA
BATTERY SWITCH (BATFET) DRIVER
R_{DS_BAT_OFF}
R_{DS_BAT_ON}
V_{BATDRV_REG}
BATFET turn-off resistance
BATFET turn-on resistance
BATFET drive voltage
V_ACN > 5V
V_ACN > 5V
V_{BATDRV_REG} = V_ACN – V_BATDRV when V_ACN > 5V and
BATFET is on
4.2
150
Ω
20 kΩ
7
V
V_{BATFET_ACN}
ACN voltage to keep BATFET on
AC SWITCH (ACFET) DRIVER
BATFET on
2.6
V
R_{DS_AC_OFF}
R_{DS_AC_ON}
V_{ACDRV_REG}
ACFET turn-off resistance
ACFET turn-on resistance
ACFET drive voltage
V_VCC > 5V
V_VCC > 5V
V_{ACDRV_REG} = V_VCC – V_ACDRV when V_VCC > 5V and
ACFET is on
4.2
30
Ω
20 kΩ
7
V
AC / BAT MOSFET DRIVERS TIMING
Driver dead time
Dead time when switching between AC and BAT
10
ms
BATTERY DETECTION
t_WAKE
I_WAKE
t_DISCHARGE
I_DISCHARGE
I_FAULT
V_WAKE
V_DISCH
Wake time
Wake current
Discharge time
Discharge current
Fault current after a timeout fault
Wake threshold (with-respect-to V_REG)
Discharge threshold
Max time charge is enabled
R_SENSE = 10mΩ
Max time discharge current is applied
Voltage on VFB to detect battery absent during Wake
Voltage on VFB to detect battery absent during
discharge
500
50
125
1
8
2
50
1.55
ms
200 mA
sec
mA
mA
mV
V
PWM HIGH SIDE DRIVER (HIDRV)
R_{DS_HI_ON}
High side driver (HSD) turn-on
resistance
V_BTST – V_PH = 5.5 V
3.3
6
Ω
R_{DS_HI_OFF}
V_{BTST_REFRESH}
High side driver turn-off resistance
Bootstrap refresh comparator threshold
voltage
V_BTST – V_PH = 5.5 V
V_BTST – V_PH when low side refresh pulse is requested
1
1.3
Ω
4.0
4.2
V
PWM LOW SIDE DRIVER (LODRV)
R_{DS_LO_ON}
R_{DS_LO_OFF}
Low side driver (LSD) turn-on resistance
Low side driver turn-off resistance
4.1
7
Ω
1
1.4
Ω
(1) Verified by design
8
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