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参数资料
| 型号： | LTC3409IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 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： | 0.62 V ~ 5.5 V |
| 输入电压： | 1.6 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.7MHz ~ 2.6MHz |
| 电流 - 输出： | 600mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3409
FUNCTIONAL DIAGRAM
MODE
5
SYNC
8
PLL
SLOPE
COMP
0.65V
OSC
V IN
V FB
1
–
+
–
EN
SLEEP
3, 4
0.613V
EA
0.4V
+
BURST
– +
I COMP
5Ω
S
Q
SOFT-
START
R Q
RS LATCH
SWITCHING
LOGIC
V IN
AND
BLANKING
ANTI-
SHOOT-
RUN
7
REFERENCE
0.675
+
OVDET
–
OV
CIRCUIT
THRU
6 SW
SHUTDOWN
I RCMP
2 GND
3409 FD
OPERATION
Main Control Loop
The LTC3409 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 comparator, 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
ampli?er 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 0.613V reference, which in turn, causes the
EA ampli?er’s output voltage to increase 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.
Comparator OVDET guards against transient overshoots
>10% by turning the main switch off and keeping it off
until the transient has ended.
Burst Mode Operation
The LTC3409 is capable of Burst Mode operation in which
the internal power MOSFETs operate intermittently based
on load demand. To enable Burst Mode operation, simply
connect the MODE pin to GND. To disable Burst Mode
operation and enable PWM pulse skipping mode, connect
the MODE pin to V IN or drive it with a logic high (V MODE
>1.1V). In this mode, the ef?ciency is lower at light loads,
but becomes comparable to Burst Mode operation when
the output load exceeds 30mA. The advantage of pulse
skipping mode is lower output ripple and less interference
3409fc
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3410 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
| LTC3410-1.875 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
| LTC3410B | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
| LTC3410BESC6#PBF | 制造商:Linear Technology 功能描述: |
| LTC3410BESC6#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 6-Pin SC-70 T/R |
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