Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
38091fc
2
LTC3809-1
ELECTRICAL CHARACTERISTICS
PARAMETER
Main Control Loops
Input DC Supply Current
Normal Operation
Sleep Mode
Shutdown
UVLO
Undervoltage Lockout Threshold (UVLO)
Shutdown Threshold of RUN Pin
Start-Up Current Source
Regulated Feedback Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
V
FB
Input Current
Overvoltage Protect Threshold
Overvoltage Protect Hysteresis
Auxiliary Feedback Threshold
Top Gate (TG) Drive Rise Time
Top Gate (TG) Drive Fall Time
Bottom Gate (BG) Drive Rise Time
Bottom Gate (BG) Drive Fall Time
Maximum Current Sense Voltage (ΔV
SENSE(MAX)
)
(V
IN
– SW)
Soft-Start Time (Internal)
Oscillator Frequency
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC3809E-1 is guaranteed to meet specified performance
from 0°C to 85°C. Specifications over the –40°C to 85°C operating range
are assured by design characterization, and correlation with statistical
process controls. The LTC3809I-1 is guaranteed to meet specified
performance over the full –40°C to 85°C operating temperature range.
C
L
= 3000pF
C
L
= 3000pF
C
L
= 3000pF
C
L
= 3000pF
IPRG = Floating (Note 6)
IPRG = 0V (Note 6)
IPRG = V
IN
(Note 6)
Time for V
FB
to Ramp from 0.05V to 0.55V
l
l
l
The
l
indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V unless otherwise noted.
CONDITIONS
(Note 4)
RUN = 0V
V
IN
= UVLO Threshold –200mV
V
IN
Falling
V
IN
Rising
TRACK/SS = 0V
(Note 5)
2.75V < V
IN
< 9.8V (Note 5)
I
TH
= 0.9V (Note 5)
I
TH
= 1.7V
(Note 5)
Measured at V
FB
0.66
0.325
l
l
l
MIN
TYP
MAX
UNITS
350
105
9
9
1.95
2.15
0.8
0.65
0.591
2.25
2.45
1.1
1
0.6
0.01
0.1
–0.1
9
0.68
20
0.4
40
40
50
40
110
70
185
0.5
480
125
85
204
0.74
550
500
150
20
20
2.55
2.75
1.4
1.35
0.609
0.04
0.5
–0.5
50
0.7
0.475
μA
μA
μA
μA
V
V
V
μA
V
%/V
%
%
nA
V
mV
V
ns
ns
ns
ns
140
100
223
0.9
600
mV
mV
mV
ms
kHz
Note 3:
T
J
is calculated from the ambient temperature TA and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
°C/W)
Note 4:
Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5:
The LTC3809-1 is tested in a feedback loop that servos I
TH
to
a specified voltage and measures the resultant V
FB
voltage.
Note 6:
Peak current sense voltage is reduced dependent on duty cycle
嵌入式系统
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