BQ24620 Datasheet, PDF (4/30 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq

bq24620
SLUS893 – MARCH 2010
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ELECTRICAL CHARACTERISTICS
5.0V ≤ 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
OPERATING CONDITIONS
V_{VCC_OP}
VCC Input voltage operating range
QUIESCENT CURRENTS
5.0
28.0
Total battery discharge current (sum of
I_BAT
currents into VCC, BTST, PH, SRP,
V_VCC < V_SRN, V_VCC > V_UVLO (SLEEP)
15
SRN, VFB), VFB ≤2.1 V
V_VCC > V_SRN, V_VCC > V_UVLO CE = LOW (IC quiescent
current)
1
1.5
I_AC
Adapter supply current (current into
VCC pin)
V_VCC > V_SRN, V_VCC >V_VCCLOW, CE = HIGH, charge
done
2
5
CHARGE VOLTAGE REGULATION
V_VCC > V_SRN, V_VCC >V_VCCLOW, CE = HIGH, Charging,
Qg_total = 20 nC, V_VCC=20V
12
V_FB
Feedback regulation voltage
Charge voltage regulation accuracy
I_VFB
Input leakage current into VFB pin
CURRENT REGULATION – FAST CHARGE
T_J = 0°C to 85°C
T_J = –40°C to 125°C
VFB = 1.8 V
1.8
–0.5%
–0.7%
0.5%
0.7%
100
V_ISET
V_{IREG_CHG}
K_ISET
ISET voltage range
SRP–SRN current sense voltage range
Charger current set factor amps of
charge current per volt on ISET pin)
V_{IREG_CHG} = V_SRP – V_SRN
R_SENSE = 10 mΩ
0
2
0
100
5
Charge current regulation accuracy
I_ISET
Leakage current in to ISET Pin
CURRENT REGULATION – PRECHARGE
V_{IREG_CHG} = 40 mV
V_{IREG_CHG} = 20 mV
V_{IREG_CHG} = 5 mV
V_{IREG_CHG} = 1.5 mV (V_SRN > 3.1V)
V_ISET = 2 V
–3%
–4%
–25%
–40%
3%
4%
25%
40%
100
Precharge current
CHARGE TERMINATION
R_SENSE = 10 mΩ, VFB < V_LOWV
50 125
200
K_TERM
Termination current range
R_SENSE = 10 mΩ
Termination current set factor (amps of
termination current per volt on ISET pin)
I_CHARGE/10
0.5
Termination current accuracy
Deglitch time for termination (both
edge)
V_ITERM = 10 mV
V_ITERM = 5 mV
V_ITERM = 1.5 mV
–10%
–25%
–45%
100
10%
25%
45%
t_QUAL
Termination qualification time
V_BAT > V_RECH and I_CHARGE < I_TERM
250
I_QUAL
Termination qualification time
Discharge current once termination is detected
2
INPUT UNDER-VOLTAGE LOCK-OUT COMPARATOR (UVLO)
V_UVLO
AC under-voltage rising threshold
V_{UVLO_HYS}
AC under-voltage hysteresis, falling
VCC LOWV COMPARATOR
Measure on VCC
3.65 3.85
4
350
Falling threshold, disable charge
Measure on VCC
4.1
Rising threshold, resume charge
4.35
4.5
SLEEP COMPARATOR (REVERSE DISCHARGING PROTECTION)
V_{SLEEP _FALL}
V_{SLEEP_HYS}
SLEEP falling threshold
SLEEP hysteresis
SLEEP rising delay
V_VCC – V_SRN to enter SLEEP
VCC falling below SRN, delay to pull up PG
40 100
150
500
1
SLEEP falling delay
VCC rising above SRN, delay to pull down PG
30
SLEEP rising shutdown deglitch
VCC falling below SRN, Delay to enter SLEEP mode
100
UNIT
V
mA
mA
V
nA
V
mV
A/V
nA
mA
A
A/V
ms
ms
mA
V
mV
V
V
mV
mV
µs
ms
ms
4
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