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| 型号： | LT3506AIDHD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.6A DL 16DFN |
| 标准包装： | 73 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 22 V |
| 输入电压： | 3.6 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 1.6A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-DFN（5x4） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3506/LT3506A
APPLICATIONS INFORMATION
capacitor on RUN/SS2. This allows the LT3506 to start up
PARASITIC DIODE
and enable its power good comparator before RUN/SS2
gets high enough to allow channel 2 to start switching.
V IN
D4
V IN
SW
V OUT
Channel 2 only operates when it is enabled with the external
control signals and output 1 is in regulation. The circuit in
Figure 5a leaves both power good indicates free. However,
the circuits in Figures 5b and 5c have another advantage.
As well as sequencing the two outputs at start-up, they
also disable channel 2 if output 1 falls out of regulation
(due to a short-circuit or a collapsing input voltage).
Finally, be aware that the circuit in Figure 5d does not
work , because the power good comparators are disabled in
shutdown. When the system is placed in shutdown mode
by pulling down on RUN/SS1, then output 1 will go low,
PG1 will pull down on RUN/SS2, and the LT3506 will enter
its low current shutdown state. This disables PG1, and
RUN/SS2 ramps up again to enable the LT3506. The circuit
will oscillate and pull extra current from the input.
Multiple Input Supplies
The internal supplies of the LT3506 operate from V IN1 . It is
possible to supply V IN2 from a different source, provided
V IN1 is above the minimum supply level whenever V IN2 is
present. This could be used when a system has two pri-
mary supplies available. It is more ef?cient to generate the
desired outputs with the lowest step-down ratio possible.
For example, if a system has 18V and 5V power available
LT3506
3506 F06
Figure 6. Shorted Input Protection
and needs to generate 12V and 2.5V, it would be more
ef?cient to generate the 2.5V output from the 5V supply
and the 12V output from the 18V supply. The LT3506 can
step down 18V to 2.5V, but the ef?ciency would be lower
than stepping down from 5V to 2.5V.
This feature can also be used when the maximum step-
down ratio is exceeded. In this case, V IN2 can be tied to
V OUT1 for applications requiring high V IN to V OUT ratios. A
dual step-down application steps down the input voltage
(V IN1 ) to the highest output voltage then uses that voltage
to power the second channel (V IN2 ). V OUT1 must be able
to provide enough current for its output plus the average
current drawn from V OUT2 . Note that the V OUT1 must be
above minimum input voltage for V IN2 when the second
channel starts to switch. Delaying the second channel can
be accomplished by either using independent soft-start
capacitors or sequencing with the PG1 output. The Two
Stage Step-Down circuit in the Applications section shows
an example of the latter approach.
V IN
GND
SW
(7a)
V IN
GND
SW
(7b)
V SW
V IN
SW
L1
I C1
C1
GND
D1
C2
3506 F07
(7c)
Figure 7. Subtracting the Current when the Switch is ON (a) From the Current when the Switch in OFF (b) Reveals the Path
of the High Frequency Switching current (c) Keep This Loop Small. The Voltage on the SW and BOOST Nodes will also be
Switched; Keep these Nodes as Small as Possible. Finally, Make Sure the Circuit is Shielded with a Local Ground Plane.
3506afc
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3506AIDHD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIDHD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIFE#PBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 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 |
| LT3506AIFE#TRPBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 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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