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参数资料
| 型号： | LTC3404MPMS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8MSOP |
| 标准包装： | 50 |
| 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： | 2.65 V ~ 6 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 600mA |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP |
LTC3404
FU CTIO AL DIAGRA
V IN
PLL LPF
BURST
DEFEAT
X
Y
Y = “0” ONLY WHEN X IS A CONSTANT “1”
8
SYNC/MODE
7
VCO
SLOPE
COMP
0.8V
OSC
3
0.6V
–
+
FREQ
SHIFT
–
6 V IN
V FB
V REF
0.8V
EA
+
V IN SLEEP
0.55V
–
+
EN
BURST
SLEEP
– +
I COMP
6 Ω
g m = 0.5m
V IN
S
R
Q
Q
V IN
2 I TH
RS LATCH
SWITCHING
LOGIC
P-CH
P-CH
AND
ANTI-
RUN
1
0.8V REF
–
BLANKING
CIRCUIT
SHOOT-
THRU
5 SW
OVDET
0.85V
+
N-CH
SHUTDOWN
I RCMP
4 GND
3404 BD
OPERATIO
Main Control Loop
The LTC3404 uses a constant frequency, current mode
step-down architecture. Both the main (P-channel MOS-
FET) and synchronous (N-channel MOSFET) switches are
internal. During normal operation, the internal top power
MOSFET is turned on each clock 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 voltage on the I TH pin, which is 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, V FB , relative to the 0.8V internal reference, which
in turn, causes the I TH 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
>6.25% by turning the main switch off and keeping it off
until the fault is removed.
Burst Mode Operation
The LTC3404 is capable of Burst Mode operation in which
the internal power MOSFETs operate intermittently based
on load demand. To enable Burst Mode operation, simply
tie the SYNC/MODE pin to V IN or connect it to a logic high
(V SYNC/MODE > 1.5V). To disable Burst Mode operation and
enable PWM pulse skipping mode, connect the SYNC/
MODE pin to GND. In this mode, the efficiency is lower at
light loads, but becomes comparable to Burst Mode
operation when the output load exceeds 50mA. The ad-
vantage of pulse skipping mode is lower output ripple and
less interference to audio circuitry.
3404fb
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3405 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN |
| LTC3405A | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3405A-1.375 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.375V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| LTC3405A-1.5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| LTC3405A-1.8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
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