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参数资料
| 型号： | LTC3405ES6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ .3A SOT23-6 |
| 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 ~ 6 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： | 300mA |
| 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-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3405
FU CTIO AL DIAGRA
MODE
6
SLOPE
OSC
FREQ
SHIFT
COMP
–
OSC
0.65V
4 V IN
V FB
5
+
–
EN
SLEEP
0.8V
EA
0.4V
+
BURST
– +
I COMP
5 ?
S
R
Q
Q
V IN
RS LATCH
SWITCHING
LOGIC
AND
ANTI-
RUN
1
0.8V REF
–
OVDET
OV
BLANKING
CIRCUIT
SHOOT-
THRU
3 SW
0.85V
+
SHUTDOWN
I RCMP
2 GND
3405 BD
OPERATIO
Main Control Loop
(Refer to Functional Diagram)
The LTC3405 uses a constant frequency, current mode
step-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET) switches
are internal. During normal operation, the internal top
power MOSFET is turned on each cycle when the oscillator
sets the RS latch, and turned off when the current com-
parator, I COMP , resets the RS latch. The peak inductor
current at which I COMP resets the RS latch, is controlled by
the output of error amplifier EA. The V FB pin, described in
the Pin Functions section, allows EA to receive an output
feedback voltage from an external resistive divider. When
the load current increases, it causes a slight decrease in
the feedback voltage relative to the 0.8V reference, which
in turn, causes the EA amplifier’s output voltage to in-
crease until the average inductor current matches the new
load current. While the top MOSFET is off, the bottom
MOSFET is turned on until either the inductor current
starts to reverse, as indicated by the current reversal
comparator I RCMP , or the beginning of the next clock
cycle.
3405fa
6
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相关代理商/技术参数 |
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|---|---|
| LTC3406 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3406-1.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3406-1.5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz, 600mA Synchronous Step-Down egulator in ThinSOT |
| LTC3406-1.8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz, 600mA Synchronous Step-Down egulator in ThinSOT |
| LTC3406A | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
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