BQ24620 Datasheet, PDF (5/30 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq

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SLUS893 – MARCH 2010
ELECTRICAL CHARACTERISTICS (continued)
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
SLEEP falling powerup deglitch
VCC rising above SRN, Delay to come out of SLEEP
mode
30
BAT LOWV COMPARATOR
V_LOWV
LOWV rising threshold (Precharge to
Fast Charge)
Measured on VFB pin
0.333 0.35
0.367
V_{LOWV_HYS}
LOWV hysteresis
100
LOWV rising deglitch
VFB falling below V_LOWV
25
LOWV falling deglitch
VFB rising above V_LOWV + V_{LOWV_HYS}
25
RECHARGE COMPARATOR
V_RECHG
Recharge threshold (with respect to
V_REG)
Recharge rising deglitch
Recharge falling deglitch
BAT OVER-VOLTAGE COMPARATOR
Measured on VFB pin
VFB decreasing below V_RECHG
VFB increasing above V_RECHG
110 125
140
10
10
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
108%
105%
V_ACOV
AC over-voltage rising threshold on
VCC
31.04
32
32.96
V_{ACOV_HYS}
AC over-voltage falling hysteresis
AC Over-Voltage Rising Deglitch
Delay to changing the STAT pins
1000
1
AC Over-Voltage Falling Deglitch
Delay to changing the STAT pins
1
THERMAL SHUTDOWN COMPARATOR
T_SHUT
Thermal shutdown rising temperature Temperature increasing
145
Thermal shutdown hysteresis
15
T_{SHUT_HYS}
Thermal shutdown rising deglitch
Temperature increasing
100
Thermal shutdown falling deglitch
Temperature decreasing
10
THERMISTOR COMPARATOR
V_LTF
V_{LTF_HYS}
V_COOL
Cold temperature rising threshold
Cold temperature hysteresis
Cool Temperature rising threshold
Charger suspended below this temperature
Charger enabled, cuts back to I_CHARGE/8 below this
temperature
72.5%
0.2%
70.2%
73.5%
0.4%
70.7%
74.5%
0.6%
71.2%
V_{COOL_HYS}
V_WARM
Cool temperature hysteresis
Warm temperature rising threshold
Charger cuts back to I_CHARGE/8 above this
temperature
0.2%
47.5%
0.6%
48%
1.0%
48.5%
V_{WARM_HYS}
V_HTF
Warm temperature hysteresis
Hot temperature rising threshold
Charger suspended above this temperature before
initiating charge
1.0%
36.2%
1.2%
37%
1.4%
37.8%
V_TCO
Cut-off temperature rising threshold
Charger suspended above this temperature during
initiating charge
33.7% 34.4%
35.1%
Deglitch time for Temperature Out of
Range Detection
V_TS > V_LTF, or V_TS < V_TCO, or V_TS < V_HTF
400
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
Deglitch time for current reduction to
I_CHARGE/8 due to warm or cool
V_TS > V_COOL, or V_TS < V_WARM
25
temperature
Deglitch time to charge at I_CHARGE from
I_CHARGE/8 when resuming from warm or
cool temperatures
V_TS < V_COOL - V_{COOL_HYS}, or V_TS > V_WARM -
V_{WARM_HYS}
25
Charge current due to warm or cool
temperatures
V_COOL < V_TS < V_LTF, or V_WARM < V_TS < V_HTF, or
V_WARM < V_TS < V_TCO
I_CHARGE/8
UNIT
ms
V
mV
ms
ms
mV
ms
ms
V
mV
ms
ms
°C
°C
ms
ms
ms
ms
ms
ms
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