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參數(shù)資料
| 型號： | LTC3872HTS8#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 1 MM HEIGHT, LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁數(shù)： | 16/22頁 |
| 文件大小： | 245K |
| 代理商： | LTC3872HTS8#TRPBF |
LTC3872
3
3872fb
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 LTC3872 is tested under pulsed load conditions such that
TJ≈TA. The LTC3872E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3872I is guaranteed
over the –40°C to 125°C operating junction temperature range. The
LTC3872H is guaranteed over the full –40°C to 150°C operating junction
temperature range. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
l
2.75
9.8
V
Input DC Supply Current
Normal Operation
Shutdown
UVLO
Typicals at VIN = 4.2V (Note 4)
2.75V ≤ VIN ≤ 9.8V, VITH = 1.3V
VRUN/SS = 0V
VIN < UVLO Threshold
250
8
20
400
20
35
A
Undervoltage Lockout Threshold
VIN Rising
VIN Falling
l
2.3
2.05
2.45
2.3
2.75
2.55
V
Shutdown Threshold (at RUN/SS)
VRUN/SS Falling
VRUN/SS Rising
l
0.6
0.65
0.85
0.95
1.05
1.15
V
Regulated Feedback Voltage
(Note 5) LTC3872E
LTC3872I and LTC3872H
l
1.182
1.178
1.2
1.218
V
Feedback Voltage Line Regulation
2.75V < VIN < 9V (Note 5)
0.14
mV/V
Feedback Voltage Load Regulation
VITH = 1.6V (Note 5)
VITH = 1V (Note 5)
0.05
–0.05
%
VFB Input Current
(Note 5)
25
50
nA
RUN/SS Pull Up Current
VRUN/SS = 0
0.35
0.7
1.25
A
Oscillator Frequency
Normal Operation
VFB = 1.2V
500
550
650
kHz
Gate Drive Rise Time
CLOAD = 3000pF
40
ns
Gate Drive Fall Time
CLOAD = 3000pF
40
ns
Peak Current Sense Voltage
IPRG = GND (Note 6)
LTC3872E
LTC3872I
LTC3872H
l
80
70
65
100
120
mV
IPRG = Float
LTC3872E
LTC3872I
LTC3872H
l
145
135
130
170
195
mV
IPRG = VIN
LTC3872E
LTC3872I
LTC3872H
l
240
225
215
270
290
mV
Default Internal Soft-Start Time
1
ms
The l denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at TA = 25°C (Note 2). 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:
LTC3872TS8: TJ = TA + (PD 195°C/W)
LTC3872DDB: TJ = TA + (PD 76°C/W)
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (QG fOSC). See Applications Information.
Note 5: The LTC3872 is tested in a feedback loop which servos VFB to
the reference voltage with the ITH pin forced to the midpoint of its voltage
range (0.7V ≤ VITH ≤ 1.9V, midpoint = 1.3V).
Note 6: Rise and fall times are measured at 10% and 90% levels.
elecTrical characTerisTics
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