Datasheet

LTC4008
3
4008fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations 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 628V
I
Q
Operating Current Charging Sum of Current from CLP, CLN, DCIN 3 5 mA
V
TOL
Voltage Accuracy (Notes 2, 5)
l
–0.8
–1.0
0.8
1.0
%
%
BATMON Error (Note 5) Measured from BAT to BATMON,
R
LOAD
= 100k
035 80 mV
I
TOL
Charge Current Accuracy (Note 3) V
CSP
– V
BAT
Target = 100mV
l
–4
–5
4
5
%
%
Shutdown
Battery Leakage Current DCIN = 0V (LTC4008 Only)
ACP/SHDN = 0V
l
l
–10
20 35
10
μA
μA
UVLO Undervoltage Lockout Threshold DCIN Rising, V
BAT
= 0V
l
4.2 4.7 5.5 V
Shutdown Threshold at ACP/SHDN
l
1 1.6 2.5 V
Operating Current in Shutdown V
SHDN
= 0V, Sum of Current from CLP,
CLN, DCIN
23 mA
Current Sense Amplifi er, CA1
Input Bias Current Into BAT Pin 11.66 μA
CMSL CA1/I
1
Input Common Mode Low
l
0V
CMSH CA1/I
1
Input Common Mode High V
DCIN
≤ 28V
l
V
CLN
– 0.2 V
V
OS
Input Voltage Offset –3.5 3.5 mV
Current Comparators I
CMP
and I
REV
I
TMAX
Maximum Current Sense Threshold (V
CSP
– V
BAT
)V
ITH
= 2.5V
l
140 165 200 mV
I
TREV
Reverse Current Threshold (V
CSP
– V
BAT
) –30 mV
Current Sense Amplifi er, CA2
Transconductance 1 mmho
Source Current Measured at I
TH
, V
ITH
= 1.4V –40 μA
Sink Current Measured at I
TH
, V
ITH
= 1.4V 40 μA
Current Limit Amplifi er
Transconductance 1.4 mmho
V
CLP
Current Limit Threshold
l
93 100 107 mV
I
CLN
CLN Input Bias Current 100 nA
Voltage Error Amplifi er, EA
Transconductance 1 mmho
V
REF
Reference Voltage Used to Calculate V
FLOAT
1.19 V
I
BEA
Input Bias Current ±4 ±25 nA
Sink Current Measured at I
TH
, V
ITH
= 1.4V 36 μA
OVSD Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
l
102 107 110 %