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| 型号： | LT3434EFE |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 54 V |
| 输入电压： | 3.3 V ~ 60 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 3A |
| 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-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
LT3434
APPLICATIO S I FOR ATIO
current mode converters, the LT3434 maximum switch
V OUT
10mV/DIV
100 μ F
75m ? TANTALUM
V OUT
10mV/DIV
100 μ F CERAMIC
current limit does not fall off at high duty cycles. Most
current mode converters suffer a drop off of peak switch
current for duty cycles above 50%. This is due to the
effects of slope compensation required to prevent
subharmonic oscillations in current mode converters.
(For detailed analysis, see Application Note 19.)
I SW
10V/DIV
I LOAD = 2A
1 μ s/DIV
3434 F03
The LT3434 is able to maintain peak switch current limit
over the full duty cycle range by using patented circuitry to
cancel the effects of slope compensation on peak switch
Figure 3. LT3434 Ripple Voltage Waveform
For high frequency switchers the ripple current slew rate
is also relevant and can be calculated from:
current without affecting the frequency compensation it
provides.
Maximum load current would be equal to maximum
switch current for an infinitely large inductor, but with
= IN
di
dt
V
L
finite inductor size, maximum load current is reduced by
one-half peak-to-peak inductor current. The following
formula assumes continuous mode operation, implying
Peak-to-peak output ripple voltage is the sum of a triwave
that the term on the right (I P-P /2) is less than I OUT .
( V OUT )( V IN – V OUT ) = I – I P -P
2 ( L )( f )( V IN )
2
created by peak-to-peak ripple current times ESR and a
square wave created by parasitic inductance (ESL) and
ripple current slew rate. Capacitive reactance is assumed
to be small compared to ESR or ESL.
I OUT ( MAX ) = I PK –
PK
V RIPPLE = ( I P-P )( ESR ) + ( ESL )
( 3 . 3 )( 12 – 3 . 3 )
( 12 ) ( 33 e ? 6 )( 200 e 3 )
= = 3 . 63 e 5
V OUT ( V IN – V OUT )
( 5 )( 8 – 5 )
2 ( 20 e – 6 )( 200 e 3 )( 8 )
( 5 )( 15 – 5 )
2 ( 20 e – 6 )( 200 e 3 )( 15 )
di
dt
Example: with V IN = 12V, V OUT = 3.3V, L = 33 μ H, ESR =
0.08 ? , ESL = 10nH:
I P-P = = 0 . 362 A
di 12
dt 3 . 3 e – 5
V RIPPLE = (0.362A)(0.08) + (10e – 9)(363e3)
= 0.0289 + 0.003 = 32mV P-P
MAXIMUM OUTPUT LOAD CURRENT
Maximum load current for a buck converter is limited by
the maximum switch current rating (I PK ). The minimum
peak current rating for the LT3434 is 3A. Unlike most
Discontinuous operation occurs when:
I OUT ( DIS ) ≤
2 ( L )( f )( V IN )
For V OUT = 5V, V IN = 8V and L = 20 μ H:
I OUT ( MAX ) = 3 –
= 3 – 0 . 24 = 2 . 76 A
Note that there is less load current available at the higher
input voltage because inductor ripple current increases. At
V IN = 15V, duty cycle is 33% and for the same set of
conditions:
I OUT ( MAX ) = 3 –
= 3 – 0 . 42 = 2 . 58 A
3434fb
12
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相关代理商/技术参数 |
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|---|---|
| LT3434EFE#PBF | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3434EFE#TR | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3434EFE#TRPBF | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3434EFEPBF | 制造商:Linear Technology 功能描述:LT3434 adj 3A Buck SD dc-dc converter |
| LT3434IFE | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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