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参数资料
| 型号： | LTC3422EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.5A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.25 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 4.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 3MHz |
| 电流 - 输出： | 1.5A |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3422
OPERATIO
f OSC =
inrush current limiting are provided during start-up as
well as normal switching mode. The same soft-start
capacitor is used for each operating mode.
When either V IN or V OUT exceeds 2.25V, the LTC3422
enters normal operating mode. Once the output voltage
exceeds the input by 0.3V typical, the LTC3422 powers
itself from V OUT instead of V IN . At this point the internal
circuitry has no dependency on the V IN input voltage,
eliminating the requirement for a large input capacitor.
The input voltage can drop as low as 0.5V without affecting
circuit operation. The limiting factor for the application
becomes the availability of the power source to supply
sufficient energy to the output at the low voltages and the
maximum duty cycle, which is clamped at 91% typical.
LOW NOISE FIXED FREQUENCY OPERATION
oscillator, the free running frequency must be set at least
20% lower than the desired synchronized frequency.
28
R T
where f OSC is in MHz and R T is in k ? .
Current Sensing
Lossless current sensing converts the peak current signal
to a voltage to sum in with the internal slope compensa-
tion. This summed signal is compared to the error ampli-
fier output to provide a peak current control command for
the PWM. The LTC3422 incorporates slope compensation
which is adaptive to the input and output voltages. There-
fore, the converter provides the proper amount of slope
compensation to ensure stability, but not an excess which
would cause a loss of phase margin in the converter.
Shutdown
The part is shutdown by pulling SHDN below 0.25V, and
activated by pulling the pin initially above 1V. Once V OUT
exceeds 2.2V typical, hysteresis is applied to this pin
allowing it to maintain a logic high state down to 0.65V.
Note that SHDN can be driven above V IN or V OUT as long
as it is limited to less than the absolute maximum rating.
Soft-Start
The soft-start time is programmed with an external capaci-
tor from SS to ground. An internal current source charges
it with a nominal 2.4 μ A. The ramping voltage on SS
dictates the gradually increasing peak current limit until
the voltage on the capacitor exceeds 1.6V, after which the
internally set peak current limit is maintained. In the event
of a commanded shutdown or a thermal shutdown, the
capacitor on SS is discharged to ground automatically.
Note that Burst Mode operation is inhibited during the
soft-start time.
t (ms) = C SS ( μ F) ? 320
Oscillator
The frequency of operation is set through a resistor from
R T to ground. A precision timing capacitor resides inside
the LTC3422. The oscillator can be synchronized with an
external clock applied to SYNC. When synchronizing the
8
Error Amplifier
The error amplifier is a transconductance amplifier, with
its positive input internally connected to the 1.216V refer-
ence and its negative input connected to FB. A simple
compensation network is placed from V C to ground.
Internal clamps limit the minimum and maximum error
amplifier output voltage for improved large-signal tran-
sient response.
Current Limit
The current limit circuitry shuts off the internal N-channel
MOSFET switch when the current limit threshold is reached.
In Burst Mode operation, the current limit is reduced to
approximately 600mA.
Zero Current Amplifier
The zero current amplifier monitors the inductor current to
the output and shuts off the synchronous rectifier once the
current falls below 50mA typical, preventing negative
inductor current.
Anti-Ringing Control
The anti-ringing control connects a resistor across the
inductor to dampen the ringing on SW during discontinu-
ous conduction mode. The LC SW ringing (L = inductor,
3422fa
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| LTC3423 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Low Output Voltage 3MHz Micropower Synchronous Boost Converters |
| LTC3423EMS | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3423EMS#PBF | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3423EMS#TR | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3423EMS#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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