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参数资料
| 型号： | LT3991EMSE-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.2A 10-MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.3 V ~ 55 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz ~ 2MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LT3991/LT3991-3.3/LT3991-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications ar e at T A = 25°C. V IN = 12V, V EN = 12V, V BD = 3.3V unless otherwise noted. (Note 2)
PARAMETER
Minimum Input Voltage
Quiescent Current from V IN
LT3991 FB Pin Current
CONDITIONS
(Note 4)
V EN Low
V EN High, V SYNC Low
V EN High, V SYNC Low
V FB = 1.19V
l
l
l
MIN
TYP
4
0.7
1.7
0.1
MAX
4.3
1.2
2.7
4.5
12
UNITS
V
μA
μA
μA
nA
Internal Feedback Resistor Divider
10
MΩ
Feedback Voltage
LT3991-3.3 Output Voltage
LT3991-5 Output Voltage
FB Voltage Line Regulation
Switching Frequency
4.3V < V IN < 40V (Note 4)
R T = 11k
R T = 35.7k
R T = 255k
l
l
l
1.175
1.165
3.25
3.224
4.93
4.89
1.6
0.8
160
1.19
1.19
3.3
3.3
5
5
0.0002
2
1
200
1.205
1.215
3.35
3.376
5.07
5.11
0.01
2.4
1.2
240
V
V
V
V
V
V
%/V
MHz
MHz
kHz
Minimum Switch On Time
110
ns
Minimum Switch Off Time
150
200
ns
Switch Current Limit
Switch V CESAT
Switch Leakage Current
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
I SW = 1A
I SH = 100mA
V REVERSE = 12V
1.7
2.3
440
0.02
800
0.02
2.9
1
1
A
mV
μA
mV
μA
Minimum Boost Voltage (Note 3)
BOOST Pin Current
V IN = 5V
I SW = 1A, V BOOST = 15V
l
1.4
25
1.8
33
V
mA
EN Voltage Threshold
EN Rising
l
0.95
1.01
1.07
V
EN Voltage Hysteresis
30
mV
EN Pin Current
0.2
20
nA
LT3991 PG Threshold Offset from V FB
V FB Rising
60
100
140
mV
LT3991 PG Hysteresis
20
mV
LT3991-X PG Threshold Offset from V OUT
V OUT Rising
5.5
9
12.5
%
LT3991X PG Hysteresis
1.3
%
PG Leakage
V PG = 3V
0.02
1
μA
PG Sink Current
SYNC Threshold
V PG = 0.4V
l
300
0.6
570
0.8
1.0
μA
V
SYNC Pin Current
0.1
nA
SS Source Current
V SS = 1V
0.6
1
1.6
μA
3
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 LT3991E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls.
The LT3991I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 4: Minimum input voltage depends on application circuit.
3991fa
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