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| 型号： | LT3435IFE#PBF |
| 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： | 500kHz |
| 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 |
LT3435
APPLICATIO S I FOR ATIO
V OUT
20mV/DIV
AC-COUPLED
C OUT = 100 μ F
TANTALUM
ESR 100m ?
V OUT
20mV/DIV
AC-COUPLED
C OUT = 100 μ F
CERAMIC
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 oscilla-
tions in current mode converters. (For detailed analysis,
see Application Note 19.)
The LT3435 is able to maintain peak switch current limit
V SW
5V/DIV
V IN = 12V
V OUT = 3.3V
500ns/DIV
3435 F03
over the full duty cycle range by using patented circuitry to
cancel the effects of slope compensation on peak switch
current without affecting the frequency compensation it
= IN
I OUT ( MAX ) = I PK – ( V OUT )( V IN – V OUT ) = I PK – I P -P
2 ( )( )( V IN )
( )( ) ( )
V RIPPLE = I P-P ESR + ESL
( )( ) . 3 3 = 0 . 319 A
( ) ( )( ) 3 e
V OUT ( V IN – V OUT )
( )( ) 5
2 ( )( )( )
= = 0 . 8 e 6
( )( ) 5
2 ( )( )( )
I LOAD = 1A
L = 15 μ H
Figure 3. LT3435 Ripple Voltage Waveform
For high frequency switchers the ripple current slew rate
is also relevant and can be calculated from:
di V
dt L
Peak-to-peak output ripple voltage is the sum of a triwave
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.
di
dt
Example: with V IN = 12V, V OUT = 3.3V, L = 15 μ H, ESR =
0.08 ? , ESL = 10nH:
3 . 3 12 –
I P-P =
12 15 e ? 6 500
di 12
dt 15 e – 6
V RIPPLE = (0.319A)(0.08) + (10e – 9)(0.8e6)
= 0.026 + 0.008 = 34mV P-P
MAXIMUM OUTPUT LOAD CURRENT
Maximum load current for a buck converter is limited by
the maximum switch current rating (I PK ). The current
rating for the LT3435 is 3A. Unlike most current mode
provides.
Maximum load current would be equal to maximum
switch current for an infinitely large inductor, but with
finite inductor size, maximum load current is reduced by
one-half peak-to-peak inductor current. The following
formula assumes continuous mode operation, implying
that the term on the right (I P-P /2) is less than I OUT .
L f 2
Discontinuous operation occurs when:
I OUT ( DIS ) ≤
2 ( L )( f )( V IN )
For V OUT = 5V, V IN = 8V and L = 15 μ H:
5 8 –
I OUT ( MAX ) = 3 –
15 e – 6 500 e 3 8
= 3 – 0 . 125 = 2 . 875 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:
5 15 –
I OUT ( MAX ) = 3 –
15 e – 6 500 e 3 15
= 3 – 0 . 22 = 2 . 88 A
converters, the LT3435 maximum switch current limit
3435fa
12
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| LT3436EFE | 功能描述:IC REG BOOST 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:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3436EFE#PBF | 功能描述:IC REG BOOST 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 |
| LT3436EFE#TR | 功能描述:IC REG BOOST 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:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3436EFE#TRPBF | 功能描述:IC REG BOOST 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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