BQ24618_15 Datasheet, PDF (10/43 Pages) Texas Instruments – System Power Selector and Low

bq24618
SLUSA55B – OCTOBER 2010 – REVISED APRIL 2015
www.ti.com
Electrical Characteristics (continued)
4.7 V ≤ V_VCC ≤ 28 V, 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
V_TCO
Cut-off temperature rising threshold
Deglitch time for temperature out-of-
range detection
As percentage of V_VREF
V_TS > V_LTF, or V_TS < V_TCO, or V_TS < V_HTF
33.7% 34.4% 35.1%
400
ms
Deglitch time for temperature in-valid-
range detection
V_TS < V_LTF – V_{LTF_HYS} or V_TS >V_TCO, or V_TS > V_HTF
20
ms
CHARGE OVERCURRENT COMPARATOR (CYCLE-BY-CYCLE)
Current rising, in nonsynchronous mode, measure on
Charge overcurrent falling threshold
V_(SRP-SRN), V_SRP < 2 V
Current rising, as percentage of V_{(IREG_CHG)}, in
V_OC
Charge overcurrent threshold floor
synchronous mode, V_SRP > 2.2 V
Minimum OCP threshold in synchronous mode,
measure on V_(SRP-SRN), V_SRP > 2.2 V
Charge overcurrent threshold ceiling
Maximum OCP threshold in synchronous mode,
measure on V_(SRP-SRN), V_SRP > 2.2 V
CHARGE UNDERCURRENT COMPARATOR (CYCLE-BY-CYCLE)
45.5
mV
160%
50
mV
180
V_ISYNSET
Charge undercurrent falling threshold
BATTERY SHORTED COMPARATOR (BATSHORT)
Switch from SYNCH to NON-SYNCH, V_SRP > 2.2 V
1
5
9 mV
V_BATSHT
BAT short falling threshold, forced
nonsynchronous mode
V_SRP falling
2
V
V_{BATSHT_HYS}
BAT short rising hysteresis
V_{BATSHT_DEG}
Deglitch on both edge
LOW CHARGE CURRENT COMPARATOR
200
mV
1
μs
Low charge current (average) falling
V_LC
threshold to force into nonsynchronous Measure on V_(SRP-SRN)
mode
1.25
mV
V_{LC_HYS}
Low charge current rising hysteresis
V_{LC_DEG}
Deglitch on both edge
VREF REGULATOR
1.25
mV
1
μs
V_{VREF_REG}
VREF regulator voltage
I_{VREF_LIM}
VREF current limit
REGN REGULATOR
V_VCC > V_UVLO, (0- to 35-mA load)
V_VREF = 0 V, V_VCC > V_UVLO
3.267
35
3.3 3.333
V
mA
V_{REGN_REG}
REGN regulator voltage
I_{REGN_LIM}
REGN current limit
TTC INPUT AND SAFETY TIMER
V_VCC > 10 V, CE = HIGH, (0- to 40-mA load)
V_REGN = 0 V, V_VCC > V_UVLO, CE = HIGH
5.7
6.0
6.3
V
40
mA
T_PRECHG
T_CHARGE
K_TTC
Precharge safety timer range⁽¹⁾
Fast-charge safety timer range, with
±10% accuracy⁽¹⁾
Fast-charge timer accuracy⁽¹⁾
Timer multiplier
TTC low threshold
Precharge time before fault occurs
Tchg = C_TTC × K_TTC
0.01 μF ≤ C_TTC ≤ 0.11 μF
V_TTC below this threshold disables the safety timer and
termination
1440
1
–10%
1800
5.6
2160 sec
10 Hr
10%
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 μA
BATTERY SWITCH (BATFET) DRIVER
R_{DS_BAT_OFF}
R_{DS_BAT_ON}
V_{BATDRV_REG}
BATFET turnoff resistance
BATFET turnon resistance
BATFET drive voltage
V_ACN > 5 V
V_ACN > 5 V
V_{BATDRV_REG} = V_ACN – V_BATDRV when V_ACN > 5 V 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}
ACFET turnoff resistance
ACFET turnon resistance
V_VCC > 5 V
V_VCC > 5 V
30
Ω
20 kΩ
(1) Verified by design.
10
Submit Documentation Feedback
Product Folder Links: bq24618
Copyright © 2010–2015, Texas Instruments Incorporated