参数资料
型号: LTC3855IFE#TRPBF
厂商: Linear Technology
文件页数: 5/44页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 38TSSOP
标准包装: 2,000
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 850kHz
占空比: 95%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
LTC3855
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range (E-Grade), otherwise specifications are at T A = 25°C. V IN = 15V, V RUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
On Chip Driver
TG R UP
TG R DOWN
BG R UP
BG R DOWN
TG Pull-Up R DS(ON)
TG Pull-Down R DS(ON)
BG Pull-Up R DS(ON)
BG Pull-Down R DS(ON)
TG High
TG Low
BG High
BG Low
2.6
1.5
2.4
1.1
Ω
Ω
Ω
Ω
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 LTC3855E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3855I is guaranteed
to meet performance specifications over the full –40°C to 125°C operating
junction temperature range.
Note 4: The LTC3855 is tested in a feedback loop that servos V ITH1,2 to a
specified voltage and measures the resultant V FB1,2 .
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current ≥40% of I MAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: Guaranteed by design.
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formulas:
LTC3855UJ: T J = T A + (P D ? 33°C/W)
LTC3855FE: T J = T A + (P D ? 25°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current
and Mode
Efficiency vs Output Current
and Mode
Full Load Efficiency and Power
Loss vs Input Voltage
100
100
90
5
90
80
70
60
50
40
30
Burst Mode
OPERATION
DCM
CCM
V IN = 12V
V OUT = 1.8V
90
80
70
60
50
40
30
Burst Mode
OPERATION
DCM
CCM
V IN = 12V
V OUT = 1.2V
85
80
1.8V
EFFICIENCY
1.2V
1.8V
POWER LOSS
1.2V
4
3
20
20
10
0
0.01
0.1
CIRCUIT OF FIGURE 19
1 10 100
10
0
0.01
0.1
CIRCUIT OF FIGURE 19
1 10 100
75
CIRCUIT OF FIGURE 19
5 10
15
2
20
LOAD CURRENT (A)
3855 G23
LOAD CURRENT (A)
3855 G24
INPUT VOLTAGE (V)
3855 G24
3855f
 
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相关代理商/技术参数
参数描述
LTC3855IUJ#PBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR
LTC3855IUJ#PBF-ES 制造商:Linear Technology 功能描述:
LTC3855IUJ#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3856EFE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 38TFSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
LTC3856EFE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)