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參數(shù)資料
| 型號： | LT3645IUD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大小： | 296K |
| 代理商： | LT3645IUD#TRPBF |
LT3645
3
3645f
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Undervoltage Lockout on VIN
Rising
l
3
3.4
3.6
V
Overvoltage Lockout on VIN
Rising
l
36
38.5
40
V
Overvoltage Lockout Hysteresis
1V
Feedback Voltage FB
l
0.79
0.785
0.8
0.81
0.813
V
FB Pin Bias Current
l
20
300
nA
Feedback Voltage Line Regulation
l
0.015
%/V
VIN Quiescent Current
Not Switching
1.4
3
mA
VIN Quiescent Current in Shutdown
VEN/UVLO = 0.3V, VCC2 = 0V, VOUT2 = 0V
0.01
2
μA
Switching Frequency
675
750
825
kHz
Maximum Duty Cycle
100mA Load
l
83
87
%
Switch Current Limit
Rising (Note 4)
0.8
1
1.25
A
DA Pin Current to Stop Osc
0.6
1
1.25
A
Switch VCESAT
ISW = 500mA
400
mV
Switch Leakage Current
2μA
Minimum Boost Voltage Above Switch
ISW = 500mA
1.6
2.2
V
BOOST Pin Current
ISW = 500mA
10
18
mA
BOOST Schottky Forward Drop
IOUT = 50mA
0.7
0.9
V
EN/UVLO Threshold High
Rising
1.17
1.23
1.29
V
EN/UVLO Threshold Hysteresis
50
mV
EN/UVLO Input Current
VEN/UVLO = 5V
VEN/UVLO = 0V
25
50
1
μA
Buck Soft-Start Time
0.9
1.8
ms
LDO Minimum Input Voltage VCC2
ILOAD = 200mA, VOUT2 = 0.8V, VIN = 4.0V
1.1
1.38
V
LDO Feedback Voltage FB2
l
782
797
810
mV
LDO FB2 Bias Current
l
20
300
nA
LDO Line Regulation
0.020
%/V
LDO Load Regulation
–1
mV
LDO Dropout Voltage (VCC2 to VOUT2)ILOAD = 10mA
ILOAD = 10mA
ILOAD = 200mA
l
45
310
65
145
mV
LDO Dropout Voltage (VIN to VOUT2)ILOAD = 200mA
ILOAD = 200mA
l
1.1
1.4
1.7
V
LDO Current Limit
l
210
270
mA
EN2 Pin Threshold
Rising
Falling
l
0.5
1.3
0.8
1.6
V
LDO Soft-Start Time
0.6
1.2
ms
NPG VCESAT
INPG = 1mA, VFB = VFB2 = 850mV
0.4
V
NPG Leakage
VNPG = 16V, VFB = VFB2 = 750mV
0.5
μA
FB2 NPG Threshold, % of Regulation Voltage
VFB = 800mV, VFB2 Rising
88
90
92
%
The
l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. VIN = 12V, BOOST = 15.3V, VCC2 = 3.3V, OUT2 = 1.8V unless
otherwise noted. (Notes 2, 3)
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