LTC4007_15 Datasheet, PDF (3/24 Pages) Linear Technology – 4A, High Effi ciency, Standalone Li-Ion Battery Charger

LTC4007
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range (Note 4), otherwise specifications are at T_A = 25°C. V_DCIN = 20V, V_BAT = 12V unless otherwise noted.
SYMBOL PARAMETER
Current Sense Amplifier, CA1
CONDITIONS
MIN
TYP
MAX UNITS
Input Bias Current Into BAT Pin
CMSL CA1/I₁ Input Common Mode Low
CMSH CA1/I₁ Input Common Mode High
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
Transconductance
l
0
l
l 140
11.67
μA
V
V_CLN – 0.2
V
165
200
mV
–30
mV
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
V_CLP Current Limit Threshold
I_CLP
CLP Input Bias Current
Voltage Error Amplifier, EA
1.4
mmho
l 93
100
107
mV
100
nA
OVSD
Transconductance
Sink Current
Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
Measured at I_TH, V_ITH = 1.4V
1
mmho
36
μA
l 102
107
110
%
Input P-Channel FET Driver (INFET)
DCIN Detection Threshold (V_DCIN – V_CLN)
Forward Regulation Voltage (V_DCIN – V_CLN)
Reverse Voltage Turn-Off Voltage (V_DCIN – V_CLN )
INFET “On” Clamping Voltage (V_DCIN – V_INFET)
INFET “Off” Clamping Voltage (V_DCIN – V_INFET)
Thermistor
DCIN Voltage Ramping Up
from V_CLN – 0.1V
DCIN Voltage Ramping Down
I_INFET = 1μA
I_INFET = –25μA
l
0
0.17
0.25
V
l
25
50
mV
l –60
–25
mV
l
5
5.8
6.5
V
0.25
V
NTCVR Reference Voltage During Sample Time
High Threshold
Low Threshold
Thermistor Disable Current
Indicator Outputs (ACP, CHG, FLAG, LOBAT, I_CL, FAULT
C10TOL FLAG (C/10) Accuracy
LBTOL LOBAT Threshold Accuracy
V_NTC Rising
V_NTC Falling
V_NTC ≤ 10V
Voltage Falling at PROG
3C4C = 0V, CHEM = 0V
3C4C = 0V, CHEM = Open
3C4C = Open, CHEM = 0V
3C4C = Open, CHEM = Open
4.5
V
l NTCVR NTCVR NTCVR
V
• 0.48 • 0.5 • 0.52
l NTCVR NTCVR NTCVR
V
• 0.115 • 0.125 • 0.135
10
μA
l 0.375 0.397 0.420
V
l 7.10
7.32
7.52
V
l 7.27
7.50
7.71
V
l 9.46
9.76
10.10
V
l 9.70
10
10.28
V
RESTART Threshold Accuracy
3C4C = 0V, CHEM = 0V
3C4C = 0V, CHEM = Open
3C4C = Open, CHEM = 0V
3C4C = Open, CHEM = Open
l 11.13 11.42 11.65
V
l 11.40 11.70 11.94
V
l 14.84 15.23 15.54
V
l 15.20 15.60 15.92
V
I_CL Threshold Accuracy
83
93
1O5
mV
4007fc
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