Datasheet

bq24450
www.ti.com SLUS929C –APRIL 2009– REVISED FEBRUARY 2012
ELECTRICAL CHARACTERISTICS
Over junction temperature range –40°C ≤ T
J
≤ 70°C, V
IN
= 10V, T
J
= T
A
. (Positive currents are into, and negative currents out
of, the specified terminal)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT
UVLO Input power detected threshold V
IN
increasing from 0V to 5V 4.2 4.5 4.8 V
V
HYS-UVLO
Hysteresis on UVLO V
IN
decreasing from 5V to 0V 200 300 mV
V
IN
= 10V 1.6 3.3
I
IN
Operating current V
IN
= 40V 1.8 3.6 mA
V
IN
= 40V, T
A
= –40°C to 85°C 1.8 4
INTERNAL REFERENCE (V
REF
)
Measured as regulating level on VFB pin
V
REF
Reference voltage level when device is in FLOAT mode. 2.275 2.300 2.325 V
T
J
= 25°C
dV
REF
/dT Temperature coefficient of V
REF
–3.5 mV/°C
ΔV
REF
Line regulation of VREF V
IN
= 5V to 40V 3 8 mV
VOLTAGE AMPLIFIER
I
VFB
Input bias current V
VFB
= 2.30V –500 –200 nA
A
OV
Open-loop gain Driver current = 1mA 50 65 dB
V
O
Output voltage swing (above GND or below V
IN
) 200 mV
CURRENT LIMIT AMPLIFIER
I
IFB
Input bias current 0.2 1 μA
V
ILIM
Threshold voltage (wrt V
IN
) 225 250 275 mV
ΔV
ILIM
Sensitivity of V
ILIM
to V
IN
V
IN
= 5V to 40V 0.03 0.25 %/V
DRIVER TRANSISTOR
V
CE
Minimum collector to emitter differential V
DRVC
= V
IN
, I
DRVE
= 10mA 2 2.2 V
I
DRVE-MAX
Maximum output current V
DRVC
– V
DRVE
= 2 V 25 40 mA
PRE-CHG
I
PRE
Maximum output current VPRE = VIN - 3V –40 –25 mA
V
PRE
Maximum output voltage (V
IN
– V
PRE-CHG
) I
PRE
= –10mA 2 2.6 V
V
PRE-REV
PRE-CHG reverse hold-off voltage V
IN
= 0 V, I
PRE
= –10μA 6.3 7 V
ENABLE COMPARATOR
V
TH-CE
Threshold voltage (x V
REF
) 0.99 1.00 1.01 V/V
I
CE
Input bias current –500 –200 nA
CURRENT SENSE COMPARATOR
I
IB-ISNS
Input bias current 100 500 nA
I
OS-ISNS
Input offset current 10 200 nA
V
ISNS
Threshold voltage (V
ISNSP
– V
ISNSM
) 20 25 30 mV
ΔV
ISNS
/ΔV
IN
Threshold sensitivity to V
IN
V
IN
= 5V to 40V 0.05 0.35 %/V
ΔV
ISNS
/Δ
VCM
Threshold sensitivity to common-mode voltage V
CM
= 2V to VIN 0.05 0.35 %/V
I
ISNS
Maximum sink current, ISNS pin V
ISNS
= 2 V 25 40 mA
V
ISNS-SAT
Saturation voltage, ISNS pin I
ISNS
= 10 mA 200 450 mV
VOLTAGE SENSE COMPARATOR
L1 = RESET 0.94 0.95 0.96
V
VSNS
Threshold voltage (x V
REF
)
L1 = SET 0.895 0.90 0.910
INPUT LOGIC LEVELS – BSTOP
V
TH-BS
Threshold voltage 0.7 1 1.3 V
I
PU-BS
Internal pull-up current V
BSTOP
= V
TH-BS
10 μA
OUTPUT LOGIC LEVELS – STAT1, STAT2, PGOOD
I
SINK-MAX
Maximum sink current V
PIN
= 2V, output transistor ON 2.5 5 mA
I
SINK
= 1.6 mA 250 450 mV
V
SAT
Output saturation voltage
I
SINK
= 50 μA 30 50 mV
I
lkg
Leakage current V
PIN
= 40V, output transistor OFF 1 3 μA
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