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LTC3809IDD-1-TR Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3809IDD-1-TR
Description  No RSENSETM, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3809IDD-1-TR Datasheet(HTML) 3 Page - Linear Technology

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LTC3809-1
3
38091fc
ELECTRICAL CHARACTERISTICS
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.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loops
Input DC Supply Current
Normal Operation
Sleep Mode
Shutdown
UVLO
(Note 4)
RUN = 0V
VIN = UVLO Threshold –200mV
350
105
9
9
500
150
20
20
μA
μA
μA
μA
Undervoltage Lockout Threshold (UVLO)
VIN Falling
VIN Rising
l
l
1.95
2.15
2.25
2.45
2.55
2.75
V
V
Shutdown Threshold of RUN Pin
0.8
1.1
1.4
V
Start-Up Current Source
TRACK/SS = 0V
0.65
1
1.35
μA
Regulated Feedback Voltage
(Note 5)
l
0.591
0.6
0.609
V
Output Voltage Line Regulation
2.75V < VIN < 9.8V (Note 5)
0.01
0.04
%/V
Output Voltage Load Regulation
ITH = 0.9V (Note 5)
ITH = 1.7V
0.1
–0.1
0.5
–0.5
%
%
VFB Input Current
(Note 5)
9
50
nA
Overvoltage Protect Threshold
Measured at VFB
0.66
0.68
0.7
V
Overvoltage Protect Hysteresis
20
mV
Auxiliary Feedback Threshold
0.325
0.4
0.475
V
Top Gate (TG) Drive Rise Time
CL = 3000pF
40
ns
Top Gate (TG) Drive Fall Time
CL = 3000pF
40
ns
Bottom Gate (BG) Drive Rise Time
CL = 3000pF
50
ns
Bottom Gate (BG) Drive Fall Time
CL = 3000pF
40
ns
Maximum Current Sense Voltage (
ΔVSENSE(MAX))
(VIN – SW)
IPRG = Floating (Note 6)
IPRG = 0V (Note 6)
IPRG = VIN (Note 6)
l
l
l
110
70
185
125
85
204
140
100
223
mV
mV
mV
Soft-Start Time (Internal)
Time for VFB to Ramp from 0.05V to 0.55V
0.5
0.74
0.9
ms
Oscillator Frequency
480
550
600
kHz
The
l indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise noted.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA °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 ITH to
a specified voltage and measures the resultant VFB voltage.
Note 6: Peak current sense voltage is reduced dependent on duty cycle
to a percentage of value as shown in Figure 1.


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