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参数资料
| 型号： | LTC3406ES5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ TSOT23-5 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 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： | 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： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-5 |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
| 其它名称： | LTC3406ES5#TRMPBFDKR |
LTC3406
LTC3406-1.5/LTC3406-1.8
FU CTIO AL DIAGRA
SLOPE
OSC
FREQ
SHIFT
COMP
–
OSC
0.65V
4 V IN
V FB /V OUT
5
+
–
SLEEP
LTC3406-1.5
R1 + R2 = 550k
R1
FB
0.6V
EA
0.4V
+
BURST
– +
I COMP
5 ?
LTC3406-1.8
R1 + R2 = 540k
R2
S
R
Q
Q
RS LATCH
SWITCHING
LOGIC
V IN
AND
BLANKING
ANTI-
SHOOT-
RUN
1
0.6V REF
CIRCUIT
THRU
3 SW
SHUTDOWN
I RCMP
2 GND
3406 BD
OPERATIO
Main Control Loop
(Refer to Functional Diagram)
Burst Mode Operation
The LTC3406 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. When the load current
increases, it causes a slight decrease in the feedback
voltage, FB, relative to the 0.6V reference, which in turn,
causes the EA amplifier’s output voltage to increase until
the average inductor current matches the new load cur-
rent. 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.
The LTC3406 is capable of Burst Mode operation in which
the internal power MOSFETs operate intermittently based
on load demand.
In Burst Mode operation, the peak current of the inductor
is set to approximately 200mA regardless of the output
load. Each burst event can last from a few cycles at light
loads to almost continuously cycling with short sleep
intervals at moderate loads. In between these burst events,
the power MOSFETs and any unneeded circuitry are turned
off, reducing the quiescent current to 20 μ A. In this sleep
state, the load current is being supplied solely from the
output capacitor. As the output voltage droops, the EA
amplifier’s output rises above the sleep threshold signal-
ing the BURST comparator to trip and turn the top MOSFET
on. This process repeats at a rate that is dependent on the
load demand.
3406fa
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3407 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator |
| LTC3407-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 3A Step-Down Switching |
| LTC3407-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator |
| LTC3407-4 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3407A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator |
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