参数资料
型号: LTC3866EFE#TRPBF
厂商: Linear Technology
文件页数: 30/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24TSSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
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: 24-TSSOP(0.173",4.40mm)裸露焊盘
包装: 带卷 (TR)
LTC3866
TYPICAL APPLICATIONS
Very Low Output Ripple Converter
The LTC3866 can work with very low DCR inductors be-
cause it can operate with only a small peak-to-peak sense
voltage. Two inductor characteristics can diminish this
signal: lower DC resistance and higher inductance. While
lower DCR improves efficiency, higher inductance reduces
output ripple. Because the LTC3866 only requires a ripple
signal about a quarter of the sense signal of the next best
current mode converters, output ripple can be drastically
reduced by increasing the inductance and capacitance of
the output filter. The very small output voltage ripple is
critical for low noise applications such as audio systems
and noise sensitive systems.
The schematic as shown Figure 15 is similar to that of the
front page circuit, except that three times the inductance
and double the output capacitance are used. The com-
pensation components are changed to maintain the same
crossover frequency and phase margin. Figure 16 shows
the transient response of 15A load step, and Figure 17
demonstrates that the output voltage ripple is a factor of
six smaller than that of typical current mode converters.
Increasing the inductance, while maintaining the same
physical size inductor, will invariably increase conduction
losses due to higher DC resistance. However, reduced ripple
current will decrease the core loss and the AC resistance
loss often enough to negate the extra DC conduction
losses. Figure 18 shows a high efficiency converter with
the benefit of low output ripple current.
100k
0.1μF
FREQ
RUN
TK/SS
MODE/PLLIN
PGOOD
ITEMP
4.7μF
220μF
V IN
4.5V TO 20V
ITH
V FB
EXTV CC
LTC3866 V IN
CMDSH-3
75pF
R B
30.1k
R A
20k
10k
680pF
C1
220nF
C2
220nF
DIFFP BOOST
DIFFN TG
SNSD + SW
SNS – BG
SNSA + PGND
ILIM CLKOUT
SGND
DIFFOUT INTV CC
0.1μF
BSC050NE2LS
BSC010NE2LS
R2
909
L1
1μH
DCR = 1m
R1
4.53k
C OUT
470μF
× 4
V OUT
1.5V
25A
3866 F15
Figure 15. High Efficiency, 1.5V/25A Step-Down Converter with Very Low Output Ripple
3866fb
30
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相关代理商/技术参数
参数描述
LTC3866EUF#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)
LTC3866EUF#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)
LTC3866IFE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)
LTC3866IFE#PBF 制造商:Linear Technology 功能描述:BUCK REGULATOR CURRENT MODE SYNC TSSOP
LTC3866IFE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 24TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)