LT3840
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
Input Supply
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
V
IN
V
IN
V
IN
V
IN
Minimum Operating Voltage
Supply Current
Burst Mode Current
Shutdown Current
2.5
V
µA
µA
µA
20
20
0.1
V
V
= 0V
30
1
MODE
EN
= 0.3V
l
l
AUXV Minimum Operating Voltage
2.5
V
V
µA
µA
µA
IN
AUXV Overvoltage Lockout
60
IN
AUXV Supply Current
(Note 3)
MODE
300
0.1
0.1
IN
AUXV Burst Mode Current
V
V
= 0V
IN
AUXV Shutdown Current
= 0.3V
1
IN
EN
l
l
l
EN Enable Threshold (Rising)
EN Hysteresis
1.20
1.20
1.20
1.25
30
2
1.30
V
mV
nA
EN Pin Bias Current
V
V
V
= 1.25V
EN
UVLO Enable Threshold (Rising)
UVLO Hysteresis
UVLO Pin Bias Current
1.25
45
1
1.30
1.30
V
mV
nA
= 1.25V
= 1.25V
UVLO
OVLO
OVLO Threshold (Rising)
OVLO Hysteresis
OVLO Pin Bias Current
1.25
125
1
V
mV
nA
Voltage Regulation
l
l
l
Regulated FB Voltage
E- and I-Grade
1.237
1.232
8
1.250
1.250
12
1.263
1.263
16
V
V
Regulated FB Voltage
MP- and H-Grade
% Above FB Voltage
FB Overvoltage Protection
FB Overvoltage Protection Hysteresis
FB Input Bias Current
%
2.5
5
%
20
nA
%/V
µS
µA
mV
mV
µA
FB Voltage Line Regulation
FB Error Amp Transconductance
FB Error Amp Sink/Source Current
Peak Current Limit Sense Voltage
Peak Current Limit Sense Voltage
TK/SS Charge Current
2.5V ≤ V ≤ 60V
0.002
300
25
0.02
IN
0% Duty Cycle
80
95
110
100% Duty Cycle
60
9
Current Regulation
l
l
Sense Common Mode Range
Average Current Limit Sense Voltage
0
60
V
V
ICTRL
V
ICTRL
= Open
= 800mV
47.5
50
40
52.5
mV
mV
l
IMON Voltage
V
SENSE
V
SENSE
= 50mV
= 20mV
0.95
1.00
0.4
1.05
V
V
ICTRL Current
V
V
V
= 1V
7
µA
mV
mV
µA
ICTRL
MODE
MODE
Reverse Protect Sense Voltage
Reverse Current Sense Voltage Offset
Sense Input Current
= 7.5V
–50
5
= V or V
= 0V
FB
MODE
–
+
SENSE = SENSE = 12V
300
Oscillator
l
Switching Frequency
R = 49.9k
280
300
50
1000
320
kHz
kHz
kHz
T
R = 348k
T
R = 13.7k
T
SYNC Threshold
1.2
V
3840fa
For more information www.linear.com/LT3840
3
Linear [ Linear ]
