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| 型号： | LT3990IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.35A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.21 V ~ 25 V |
| 输入电压： | 4.2 V ~ 62 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 210kHz ~ 2.3MHz |
| 电流 - 输出： | 350mA |
| 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-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT3990/LT3990-3.3/LT3990-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 12V, V BD = 3.3V unless otherwise noted. (Note 2)
PARAMETER
Minimum Input Voltage
Quiescent Current from V IN
CONDITIONS
V EN/UVLO Low
V EN/UVLO High
V EN/UVLO High
l
l
MIN
TYP
4
0.7
1.9
MAX
4.2
1.2
2.8
4
UNITS
V
μA
μA
μA
LT3990 Feedback Voltage
LT3990-3.3 Output Voltage
LT3990-5 Output Voltage
LT3990 FB Pin Bias Current (Note 3)
FB/Output Voltage Line Regulation
Switching Frequency
Switch Current Limit
Catch Schottky Current Limit
Switch V CESAT
Switch Leakage Current
Catch Schottky Forward Voltage
Catch Schottky Reverse Leakage
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
4.2V < V IN < 40V
R T = 41.2k, V IN = 6V
R T = 158k, V IN = 6V
R T = 768k, V IN = 6V
V IN = 5V, V FB = 0V
V IN = 5V
I SW = 200mA
I SCH = 100mA, V IN = V BD = NC
V SW = 12V
I SCH = 50mA, V IN = NC, V BOOST = 0V
V REVERSE = 12V
l
l
l
l
1.195
1.185
3.26
3.234
4.94
4.9
1.84
672
168
535
360
1.21
1.21
3.3
3.3
5
5
0.1
0.0002
2.3
840
210
700
450
210
0.05
725
0.05
900
0.02
1.225
1.235
3.34
3.366
5.06
5.1
20
0.01
2.76
1008
252
865
540
2
2
2
V
V
V
V
V
V
nA
%/V
MHz
kHz
kHz
mA
mA
mV
μA
mV
μA
mV
μA
Minimum Boost Voltage (Note 4)
BOOST Pin Current
EN/UVLO Pin Current
V IN = 5V
I SW = 200mA, V BOOST = 15V
V EN/UVLO = 12V
l
1.4
8.5
1
1.8
12
30
V
mA
nA
EN/UVLO Voltage Threshold
EN/UVLO Rising, V IN ≥ 4.2V
l
1.14
1.19
1.28
V
EN/UVLO Voltage Hysteresis
35
mV
PG Threshold Offset from Feedback Voltage
V FB Rising
6.5
10
13.5
%
PG Hysteresis as % of Output Voltage
1.0
%
PG Leakage
V PG = 3V
0.01
1
μA
PG Sink Current
V PG = 0.4V
l
30
80
μA
Minimum Switch On-Time
115
ns
Minimum Switch Off-Time
V IN = 10V
l
100
160
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 3: Bias current flows into the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 2: The LT3990E 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
LT3990I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3990H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C.
3990fa
3
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