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参数资料
| 型号： | LTC3809IDD-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC10 |
| 封装： | 3 X 3 MM, PLASTIC, DFN-10 |
| 文件页数： | 18/24页 |
| 文件大小： | 256K |
| 代理商： | LTC3809IDD-1 |
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 specied performance
from 0°C to 85°C. Specications 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 specied
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
500
150
20
μA
Undervoltage Lockout Threshold (UVLO)
VIN Falling
VIN Rising
l
1.95
2.15
2.25
2.45
2.55
2.75
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
110
70
185
125
85
204
140
100
223
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 specications which apply over the full operating
temperature range, otherwise specications 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 specied 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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