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参数资料
| 型号： | LTC3414MPFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 4MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3414
BLOCK DIAGRA
SV IN
16
SGND
5
I TH
18
EXPOSED PAD
21
PV IN
7
PV IN
14
PMOS CURRENT
0.8V
VOLTAGE
REFERENCE
SLOPE
COMPENSATION
RECOVERY
COMPARATOR
+
BCLAMP
+
–
V FB 19
–
ERROR
AMPLIFIER
SYNC/MODE
V
+
BURST
COMPARATOR
SLOPE
COMPENSATION
0.74V
+
–
OSCILLATOR
8
9
SW
SW
RUN/SS
4
RUN
LOGIC
NMOS CURRENT
COMPARATOR
12 SW
+
13 SW
0.86V
–
CURRENT
REVERSAL
PGOOD 17
COMPARTOR
+
1
PGND
10 PGND
–
11 PGND
2
RT
3
SYNC/MODE
20
PGND
3414 BD
OPERATIO
Main Control Loop
The LTC3414 is a monolithic, constant-frequency, cur-
rent-mode step-down DC/DC converter. During normal
operation, the internal top power switch (P-channel MOS-
FET) is turned on at the beginning of each clock cycle.
Current in the inductor increases until the current com-
parator trips and turns off the top power MOSFET. The
peak inductor current at which the current comparator
shuts off the top power switch is controlled by the voltage
on the I TH pin. The error amplifier adjusts the voltage on
the I TH pin by comparing the feedback signal from a
resistor divider on the V FB pin with an internal 0.8V
reference. When the load current increases, it causes a
reduction in the feedback voltage relative to the reference.
The error amplifier raises the I TH voltage until the average
inductor current matches the new load current. When the
top power MOSFET shuts off, the synchronous power
switch (N-channel MOSFET) turns on until either the
bottom current limit is reached or the beginning of the next
clock cycle. The bottom current limit is set at –5A for
forced continuous mode and 0A for Burst Mode operation.
The operating frequency is externally set by an external
resistor connected between the RT pin and ground. The
practical switching frequency can range from 300kHz to
4MHz.
Overvoltage and undervoltage comparators will pull the
PGOOD output low if the output voltage comes out of
regulation by ± 7.5%. In an overvoltage condition, the top
power MOSFET is turned off and the bottom power MOS-
FET is switched on until either the overvoltage condition
clears or the bottom MOSFET’s current limit is reached.
Forced Continuous Mode
Connecting the SYNC/MODE pin to SV IN will disable Burst
Mode operation and force continuous current operation.
At light loads, forced continuous mode operation is less
efficient than Burst Mode operation, but may be desirable
in some applications where it is necessary to keep switch-
3414fb
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3415 | 制造商:LINER 制造商全称:Linear Technology 功能描述:7A, PolyPhase Synchronous Step-Down Regulator |
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| LTC3415EUHF#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 38-Pin QFN EP T/R |
| LTC3415EUHF#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 7A 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:PolyPhase® 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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