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参数资料
| 型号： | LTC3415EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 7A 38QFN |
| 标准包装： | 52 |
| 系列： | PolyPhase® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 7A |
| 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： | 38-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 38-QFN（5x7） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
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LTC3415
OPERATION
Main Control Loop
The LTC3415 is a constant frequency, current mode,
monolithic step down regulator. In normal operation,
the internal top P-channel power MOSFET turns on each
cycle when the oscillator sets the RS latch, and turns
off when the current comparator I COMP resets the RS
latch. The peak inductor current at which I COMP resets
the RS latch is controlled by the voltage on the I TH pin,
which is the output of error ampli?er EA. The FB pin
allows EA to receive an output feedback voltage from
an external resistive divider. When the load current in-
creases, it causes a slight decrease in the feedback volt-
age relative to the 0.596V reference, which in turn causes
I TH voltage to increase until the average inductor current
matches the new load current. While the top P-channel
power MOSFET is off, the bottom N-Channel power MOSFET
is turned on until either the inductor current starts to re-
verse, as indicated by the current reversal comparator
I RCMP , or the beginning of the next cycle.
The main control loop is shut down by pulling the RUN pin
below 1.5V (V TRACK = SV IN or V TRACK < 0.18V). Tying RUN
higher than 1.5V allows operation to begin. To control the
rise time of the output, a voltage ramp can be applied to
the TRACK pin. The FB voltage will servo to the TRACK
voltage until TRACK goes above 0.57V, which is when
PGOOD is high and the output is in normal regulation.
If TRACK is not used (tied high), then an internal 100μs
soft-start will ramp up the output.
Burst Mode Operation
The LTC3415 is capable of Burst Mode operation in which
the power MOSFETs operate intermittently based on load
demand, thus saving quiescent current. For applications
where maximizing the ef?ciency at very light loads is a
high priority, Burst Mode operation should be applied. To
enable Burst Mode operation, simply tie the MODE pin to
V IN . During this operation, the peak current of the inductor
is set to approximately 20% of the maximum peak current
value in normal operation even though the voltage at the
I TH pin indicates a lower value. The voltage at the I TH pin
drops when the inductor’s average current is greater than
the load requirement. As the I TH voltage drops below 0.2V,
the BURST comparator trips, causing the internal sleep
line to go high and turn off both power MOSFETs.
In sleep mode, the internal circuitry is partially turned off,
reducing the quiescent current to about 450μA. The load
current is now being supplied from the output capacitor.
When the output voltage drops, causing I TH to rise above
0.25V, the internal sleep line goes low, and the LTC3415
resumes normal operation. The next oscillator cycle will
turn on the top power MOSFET and the switching cycle
repeats.
Pulse-Skipping Mode Operation
In applications where ?xed frequency operation, low
output ripple and high ef?ciency at intermediate current
is desired, pulse-skipping mode should be used. Pulse-
skipping operation allows the LTC3415 to skip cycles at
low output loads, thus increasing ef?ciency by reducing
switching current. Tying the MODE pin to V IN /2 enables
pulse-skipping operation. This allows discontinuous
conduction mode (DCM) operation down to near the limit
de?ned by the chip’s minimum on-time (about 100ns).
Below this output current level, the converter will begin
to skip cycles in order to maintain output regulation.
Increasing the output load current slightly, above the
minimum required for discontinuous conduction mode,
allows constant frequency PWM.
Forced Continuous Operation
In applications where ?xed frequency operation is more
critical than low current ef?ciency, and where the lowest
output ripple is desired, forced continuous operation should
be used. Forced continuous operation can be enabled by
tying the MODE pin to GND. In this mode, inductor cur-
rent is allowed to reverse during low output loads, the I TH
voltage is in control of the current comparator threshold
throughout, and the top MOSFET always turns on with each
oscillator pulse. During start-up, forced continuous mode is
disabled and inductor current is prevented from reversing
until the LTC3415’s output voltage is in regulation.
3415fa
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3415EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:7A, PolyPhase Synchronous Step-Down Regulator |
| LTC3416 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:20V, 5A Synchronous Step-Down Regulator |
| LTC3416EFE | 功能描述:IC REG BUCK SYNC ADJ 4A 20TSSOP 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 |
| LTC3416EFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 20TSSOP 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 |
| LTC3416EFE#TR | 功能描述:IC REG BUCK SYNC ADJ 4A 20TSSOP 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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