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参数资料
| 型号： | LT3433EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 0.5A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 3.3 V ~ 20 V |
| 输入电压： | 4 V ~ 60 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 500mA |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LT3433
APPLICATIO S I FOR ATIO
Antislope Compensation
Most current mode switching controllers use slope com-
pensation to prevent current mode instability. The LT3433
is no exception. A slope compensation circuit imposes an
artificial ramp on the sensed current to increase the rising
switches the V OUT side of the inductor. The LT3433
bridged topology merges the elements of buck and boost
topologies, providing switches on both sides of the induc-
tor. Operating both switches simultaneously achieves
both step-up and step-down functionality.
slope as duty cycle increases. Unfortunately, this addi-
tional ramp corrupts the sensed current value, reducing
the achievable current limit value by the same amount as
V IN
Step-Down (V IN > V OUT )
SW L
V OUT
the added ramp represents. As such, current limit is
typically reduced as duty cycles increase.
C IN
D
C OUT
L
The LT3433 contains circuitry to eliminate the current limit
reduction associated with slope-compensation, or anti-
slope compensation. As the slope compensation ramp is
V IN
Step-Up (V IN < V OUT )
D
V OUT
added to the sensed current, a similar ramp is added to the
current limit threshold reference. The end result is that
C IN
SW
C OUT
current limit is not compromised so the LT3433 can
provide full power regardless of required duty cycle.
Step-Up/Step-Down (V IN > V OUT or V IN < V OUT )
Mode Switching
The LT3433 switches between buck and buck/boost modes
V IN
SW
C IN
D
L
D
SW
V OUT
C OUT
of operation automatically. While in buck mode, if the
converter input voltage becomes close enough to the
output voltage to require a duty cycle greater than 75%,
the LT3433 enables a second switch which pulls the
output side of the inductor to ground during the switch-on
time. This “bridged” switching configuration allows volt-
age conversion to continue when V IN approaches or is less
than V OUT .
When the converter input voltage falls to where the duty
cycle required for continuous buck operation is greater
than 75%, the LT3433 enables its ground-referred switch,
changing the converter operation to a dual-switch bridged
configuration. Because the voltage available across the
switched inductor is greater while bridged, operational
duty cycle will decrease. Voltage drops associated with
external diodes and loss terms are estimated internally so
that required operating duty cycle can be calculated re-
gardless of specific operating voltages.
In the simplest terms, a buck DC/DC converter switches
the V IN side of the inductor, while a boost converter
3433 F01
Maximum duty cycle capability (DC MAX ) gates the dropout
capabilities of a buck converter. As V IN – V OUT is reduced,
the required duty cycle increases until DC MAX is reached,
beyond which the converter loses regulation. With a
second switch bridging the switched inductor between V IN
and ground, the entire input voltage is imposed across the
inductor during the switch-on time, which subsequently
reduces the duty cycle required to maintain regulation.
Using this topology, regulation is maintained as V IN ap-
proaches or drops below V OUT .
Inductor Selection
The primary criterion for inductor value selection in LT3433
applications is the ripple current created in that inductor.
Design considerations for ripple current are converter
output capabilities in bridged mode, output voltage ripple
and the ability of the internal slope compensation wave-
form to prevent current mode instability.
3433f
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3433IFE | 功能描述:IC REG BUCK BST ADJ 0.5A 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 |
| LT3433IFE#PBF | 功能描述:IC REG BUCK BST ADJ 0.5A 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 |
| LT3433IFE#TR | 功能描述:IC REG BUCK BST ADJ 0.5A 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 |
| LT3433IFE#TRPBF | 功能描述:IC REG BUCK BST ADJ 0.5A 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 |
| LT3433IFEPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Up/Down 60V TSSOP16 |
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