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| 型号： | LT3689EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.7A 16QFN |
| 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： | 0.8 V ~ 34.2 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 700mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
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LT3689/LT3689-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C. V IN = 12V, V OUT = 5V, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
t UV
UV Detect to RST Asserted
WDI Input Threshold
Step V FB from 0.9V to 0.5V
l
l
10
0.4
30
0.95
65
1.15
μs
V
WDI Input Pull-Up Current
–2
μA
WDI Input Pulse Width
l
300
ns
W /T Threshold Voltage
l
0.4
0.8
1
V
W /T Input Pull-Down Current
2.6
μA
WDE Threshold Voltage
WDO Pull-Up Current (Note 6)
RST Pull-Up Current (Note 6)
l
0.4
–0.6
–0.6
0.8
–0.85
–0.85
1
V
μA
μA
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: Absolute maximum voltage at V IN and EN/UVLO pins is 60V for
nonrepetitive 1 second transients, and 36V for continuous operation.
Note 3: The LT3689E 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
LT3689I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3689H 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.
Note 4 : Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6: The output of RST and WDO has a weak pull-up to V OUT of
typically 1μA. However, external pull-up resistors may be used when faster
rise times are required or for V OH higher than V OUT .
Note 7: Polarity specification for all currents into pins is positive. All
voltages are referenced to GND unless otherwise specified.
Note 8: For the LT3689-5, V OUT is set to 5.5V to ensure the switching.
TYPICAL PERFORMANCE CHARACTERISTICS
95
90
85
Efficiency, V OUT = 5V
T A = 25°C
f = 1MHz
V IN = 12V
V IN = 24V
90
85
80
Efficiency, V OUT = 3.3V
T A = 25°C
f = 700kHz
V IN = 12V
V IN = 24V
80
75
70
Efficiency, V OUT = 1.8V
T A = 25°C
f = 1MHz V IN = 5V
V IN = 12V
80
65
75
70
V IN = 32V
75
70
V IN = 32V
60
55
65
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
65
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
50
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
LOAD CURRENT (A)
3689 G01
LOAD CURRENT (A)
3689 G02
LOAD CURRENT (A)
3689 G03
3689fe
4
For more information www.linear.com/LT3689
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