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參數(shù)資料
| 型號： | LTC1871HMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 31/36頁 |
| 文件大?。?/td> | 519K |
| 代理商： | LTC1871HMS |
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LTC1871
4
1871fe
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. VIN = VINTVCC = 5V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless
otherwise specied.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DMAX
Maximum Duty Cycle
87
92
97
%
I-Grade or H-Grade (Note 2)
●
87
92
97
%
fSYNC/fOSC
Recommended Maximum Synchronized
Frequency Ratio
fOSC = 300kHz (Note 6)
1.25
1.30
fOSC = 300kHz (Note 6), I-Grade or H-Grade (Note 2) ●
1.25
1.30
tSYNC(MIN)
MODE/SYNC Minimum Input Pulse Width
VSYNC = 0V to 5V
25
ns
tSYNC(MAX)
MODE/SYNC Maximum Input Pulse Width VSYNC = 0V to 5V
0.8/fOSC
ns
VIL(MODE)
Low Level MODE/SYNC Input Voltage
0.3
V
I-Grade or H-Grade (Note 2)
●
0.3
V
VIH(MODE)
High Level MODE/SYNC Input Voltage
1.2
V
I-Grade or H-Grade (Note 2)
●
1.2
V
RMODE/SYNC
MODE/SYNC Input Pull-Down Resistance
50
kΩ
VFREQ
Nominal FREQ Pin Voltage
0.62
V
Low Dropout Regulator
VINTVCC
INTVCC Regulator Output Voltage
VIN = 7.5V
5.0
5.2
5.4
V
VIN = 7.5V, I-Grade (Note 2)
●
5.0
5.2
5.4
V
VIN = 7.5V, H-Grade (Note 2)
●
4.95
5.2
5.45
V
ΔVINTVCC
ΔVIN1
INTVCC Regulator Line Regulation
7.5V ≤ VIN ≤ 15V
8
25
mV
ΔVINTVCC
ΔVIN2
INTVCC Regulator Line Regulation
15V ≤ VIN ≤ 30V
70
200
mV
VLDO(LOAD)
INTVCC Load Regulation
0 ≤ IINTVCC ≤ 20mA, VIN = 7.5V
– 2
–0.2
%
VDROPOUT
INTVCC Regulator Dropout Voltage
VIN = 5V, INTVCC Load = 20mA
280
mV
IINTVCC
Bootstrap Mode INTVCC Supply
Current in Shutdown
RUN = 0V, SENSE = 5V
10
20
μA
I-Grade (Note 2)
●
30
μA
H-Grade (Note 2)
●
50
μA
GATE Driver
tr
GATE Driver Output Rise Time
CL = 3300pF (Note 7)
17
100
ns
tf
GATE Driver Output Fall Time
CL = 3300pF (Note 7)
8
100
ns
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 LTC1871E is guaranteed to meet performance specications
from 0°C to 85°C operating temperature. Specications over the – 40°C to
85°C operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC1871I is
guaranteed over the full –40°C to 125°C operating temperature range
and the LTC1871H is guaranteed over the full –40°C to 150°C operating
temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD 110°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 LTC1871 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 (0.3V ≤ VITH ≤ 1.2V, midpoint = 0.75V).
Note 6: In a synchronized application, the internal slope compensation
gain is increased by 25%. Synchronizing to a signicantly higher ratio will
reduce the effective amount of slope compensation, which could result in
subharmonic oscillation for duty cycles greater than 50%.
Note 7: Rise and fall times are measured at 10% and 90% levels.
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