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(2)
I
O(PRECHG)
+
ǒ
K
(SET)
V
(PRECHG)
Ǔ
R
SET
(3)
I
O(TAPER)
+
ǒ
K
(SET)
V
(TAPER)
Ǔ
R
SET
(4)
I
O(TERM)
+
ǒ
K
(SET)
V
(TERM)
Ǔ
R
SET
bq24020 , , bq24022 , , bq24023
bq24024 , bq24025 , bq24026
bq24027
SLUS549E – DECEMBER 2002 – REVISED NOVEMBER 2007
ELECTRICAL CHARACTERISTICS (continued)
over 0 ° C ≤ T
J
≤ 125 ° C and recommended supply voltage, unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
PRECHARGE AND SHORT-CIRCUIT CURRENT REGULATION
Precharge to fast-charge Voltage on OUT pin 2.8 3.0 3.2
V
(LOWV)
V
transition threshold
Deglitch time for fast-charge to V
CC(MIN)
≥ 4.5 V, t
FALL
= 100 ns, 10 mV 250 375 500
ms
precharge transition overdrive, V
I(OUT)
decreasing below threshold
I
O(PRECHG)
Precharge range
(2)
0 V < V
I(OUT)
< V
(LOWV)
, t < t
(PRECHG)
5 100 mA
Voltage on ISET1 pin V
O(REG)
= 4.2 V 240 255 270
V
(PRECHG)
Precharge set voltage mV
0 V < V
I(OUT)
> V
(LOWV)
, t < t
(PRECHG)
CHARGE TAPER AND TERMINATION DETECTION
I
(TAPER)
Charge taper detection range
(3)
V
I(OUT)
> V
(RCH)
, t < t
(TAPER)
5 100
USB-100 charge taper V
I(OUT)
> V
(RCH)
, ISET2 = Low 6.5 9 11
bq24026
detection level mA
USB-500 charge taper V
I(OUT)
> V
(RCH)
, ISET2 = High 32 44 55
bq24026
detection level
Voltage on ISET1 pin, V
O(REG)
= 4.2 V, 235 250 265
V
(TAPER)
Charge taper detection set voltage
V
I(OUT)
> V
(RCH)
, t < t
(TAPER)
mV
Voltage on ISET1 pin, V
O(REG)
= 4.2 V, 11 18 25
Charge termination detection
V
(TERM)
set voltage
(4)
V
I(OUT)
> V
(RCH)
V
CC(MIN)
≥ 4.5 V, t
FALL
= 100 ns charging 250 375 500
t
(TPRDET)
Deglitch time for TAPER detection current increasing or decreasing above and
below, 10 mV overdrive
ms
Deglitch time for V
CC(MIN)
≥ 4.5 V, t
FALL
= 100 ns charging 250 375 500
t
(TRMDET)
termination detection current decreasing below, 10 mV overdrive
TEMPERATURE SENSE COMPARATOR
V
(HTF)
High-voltage threshold PTC thermistor 2.475 2.500 2.525
V
V
(LTF)
Low-voltage threshold PTC thermistor 0.485 0.500 0.515
I
(TS)
Current source 96 102 108 µ A
t
(DEGL)
Deglitch time for temperature fault 250 375 500 ms
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