BQ24650 Datasheet, PDF (5/33 Pages) Texas Instruments – Synchronous Switch-Mode Battery Charge Controller for Solar Power With Maximum Power Point Tracking

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SLUSA75 – JULY 2010
ELECTRICAL CHARACTERISTICS (continued)
5.0V ≤ V_VCC ≤ 28V, –40°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 UNITS
BAT LOWV COMPARATOR
V_LOWV
Precharge to fast charge transition (LOWV
threshold)
Measure on VFB pin
1.54 1.55 1.56
V
V_{LOWV_HYS}
LOWV hysteresis
LOWV rising deglitch
LOWV falling deglitch
RECHARGE COMPARATOR
VFB falling below V_LOWV
VFB rising above V_LOWV + V_{LOWV_HYS}
100
mV
25
ms
25
ms
V_RECHG
Recharge threshold (with respect to V_REG)
Recharge rising deglitch
Recharge falling deglitch
BAT OVER-VOLTAGE COMPARATOR
Measure on VFB pin
VFB decreasing below V_RECHG
VFB increasing above V_RECHG
35
50
65 mV
10
ms
10
ms
V_{OV_RISE}
Over-voltage rising threshold
V_{OV_FALL}
Over-voltage falling threshold
INPUT OVER-VOLTAGE COMPARATOR (ACOV)
As percentage of V_FB
As percentage of V_FB
104%
102%
V_ACOV
V_{ACOV_HYS}
AC over-voltage rising threshold on VCC
AC over-voltage falling hysteresis
AC over-voltage deglitch (both edges)
Delay to changing the STAT pins
31
32
33
V
1
V
1
ms
AC over-voltage rising deglitch
Delay to disable charge
1
ms
AC over-voltage falling deglitch
Delay to resume charge
20
ms
THERMAL SHUTDOWN COMPARATOR
T_SHUT
T_{SHUT_HYS}
Thermal shutdown rising temperature
Thermal shutdown hysteresis
Thermal shutdown rising deglitch
Temperature increasing
Temperature increasing
145
°C
15
°C
100
µs
Thermal shutdown falling deglitch
Temperature decreasing
10
ms
THERMISTOR COMPARATOR
V_LTF
Cold temperature rising threshold
V_{LTF_HYS}
V_HTF
Rising hysteresis
Hot temperature rising threshold
As percentage to V_VREF
V_TCO
Cut-off temperature rising threshold
Deglitch time for temperature out of range
detection
V_TS < V_LTF, or V_TS < V_TCO, or
V_TS < V_HTF
Deglitch time for temperature in valid range V_TS > V_LTF – V_{LTF_HYS} or V_TS >V_TCO, or V_TS >
detection
V_HTF
CHARGE OVER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
72.5%
0.2%
46.7%
44.3%
73.5%
0.4%
47.5%
45%
74.5%
0.6%
48.3%
45.7%
400
ms
20
ms
V_OC
Charge over-current rising threshold
Current rising, in synchronous mode measure
(V_SRP – V_SRN)
CHARGE UNDER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
80
mV
V_ISYNSET
Charge under-current falling threshold
BATTERY SHORTED COMPARATOR (BATSHORT)
Switch from CCM to DCM, V_SRP > 2.2V
1
5
9 mV
V_BATSHT
BAT short falling threshold, forced
non-synchronous mode
V_SRP falling
2
V
V_{BATSHT_HYS}
BAT short rising hysteresis
t_{BATSHT_DEG}
Deglitch on both edges
LOW CHARGE CURRENT COMPARATOR
200
mV
1
µs
V_LC
Low charge current falling threshold
V_{LC_HYS}
Low charge current rising hysteresis
t_{LC_DEG}
Deglitch on both edges
VREF REGULATOR
Measure V_(SRP-SRN)
1.25
mV
1.25
mV
1
µs
V_{VREF_REG}
I_{VREF_LIM}
VREF regulator voltage
VREF current limit
V_VCC > V_UVLO, 0 – 35 mA load
V_VREF = 0 V, V_VCC > V_UVLO
3.267
35
3.3 3.333
V
mA
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