LTC4008_15 Datasheet, PDF (3/24 Pages) Linear Technology – 4A, High Effi ciency, Multi-Chemistry Battery Charger

LTC4008
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_DCIN = 20V, V_BAT = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DCIN Operating Range
6
28
V
I_Q
Operating Current
V_TOL
Voltage Accuracy
Charging Sum of Current from CLP, CLN, DCIN
3
5
mA
(Notes 2, 5)
–0.8
l –1.0
0.8
%
1.0
%
BATMON Error (Note 5)
I_TOL
Charge Current Accuracy (Note 3)
Measured from BAT to BATMON,
R_LOAD = 100k
V_CSP – V_BAT Target = 100mV
0
35
80
mV
–4
l –5
4
%
5
%
Shutdown
Battery Leakage Current
DCIN = 0V (LTC4008 Only)
ACP/SHDN = 0V
l
20
35
μA
l –10
10
μA
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold at ACP/SHDN
DCIN Rising, V_BAT = 0V
l 4.2
4.7
5.5
V
l1
1.6
2.5
V
Operating Current in Shutdown
V_SHDN = 0V, Sum of Current from CLP,
CLN, DCIN
2
3
mA
Current Sense Amplifier, CA1
Input Bias Current Into BAT Pin
11.66
μA
CMSL CA1/I₁ Input Common Mode Low
CMSH CA1/I₁ Input Common Mode High
V_DCIN ≤ 28V
V_OS
Input Voltage Offset
Current Comparators I_CMP and I_REV
I_TMAX Maximum Current Sense Threshold (V_CSP – V_BAT) V_ITH = 2.5V
I_TREV Reverse Current Threshold (V_CSP – V_BAT)
Current Sense Amplifier, CA2
l0
l
–3.5
V
V_CLN – 0.2
V
3.5
mV
l 140 165
200
mV
–30
mV
Transconductance
1
mmho
Source Current
Sink Current
Current Limit Amplifier
Measured at I_TH, V_ITH = 1.4V
Measured at I_TH, V_ITH = 1.4V
–40
μA
40
μA
Transconductance
1.4
mmho
V_CLP
Current Limit Threshold
l 93
100
107
mV
I_CLN
CLN Input Bias Current
Voltage Error Amplifier, EA
100
nA
Transconductance
1
mmho
V_REF
I_BEA
OVSD
Reference Voltage Used to Calculate V_FLOAT
Input Bias Current
Sink Current
Measured at I_TH, V_ITH = 1.4V
Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
1.19
V
±4
±25
nA
36
μA
l 102 107
110
%
4008fb
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