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| 型号： | LT3845MPFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3845
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 20V, V CC = BOOST = BURST_EN = 10V, SHDN = 2V, R SET = 49.9kΩ,
SENSE – = SENSE + = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.
PARAMETER
TG, BG Drive On Voltage (Note 7)
TG, BG Drive Off Voltage
TG, BG Drive Rise/Fall Time
Minimum TG Off Time
Minimum TG On Time
Gate Drive Nonoverlap Time
CONDITIONS
C LOAD = 3300pF
C LOAD = 3300pF
10% to 90% or 90% to 10%, C LOAD = 3300pF
TG Fall to BG Rise
●
●
MIN
TYP
9.8
0.1
50
350
250
200
MAX
650
400
UNITS
V
V
ns
ns
ns
ns
BG Fall to TG Rise
150
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 LT3845 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 3: The LT3845E is guaranteed to meet performance speci?cations
from 0°C to 125°C junction temperature. Speci?cations over the – 40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3845I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3845MP is 100% tested and guaranteed over
the –55°C to 125°C temperature range.
Note 4: V IN voltages below the start-up threshold (7.5V) are only
supported when the V CC is externally driven above 6.5V.
Note 5: Operating range is dictated by MOSFET absolute maximum V GS .
Note 6: Supply current speci?cation does not include switch drive
currents. Actual supply currents will be higher.
Note 7: DC measurement of gate drive output “ON” voltage is typically
8.6V. Internal dynamic bootstrap operation yields typical gate “ON”
voltages of 9.8V during standard switching operation. Standard operation
gate “ON” voltage is not tested but guaranteed by design.
Note 8: The –2V absolute maximum on the SW pin is a transient condition.
It is guaranteed by design and not subject to test.
3845fd
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3846 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Current Mode PWM Controller |
| LT3846J | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 200mA 16-Pin CDIP |
| LT3846N | 制造商:LINER 制造商全称:Linear Technology 功能描述:Current Mode PWM Controller |
| LT3847 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Current Mode PWM Controller |
| LT3847J | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 200mA 16-Pin CDIP |
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