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参数资料
| 型号： | LT3506IDHD |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.6 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 5 X 4 MM, PLASTIC, MO-229WJGD-2, DFN-16 |
| 文件页数： | 8/24页 |
| 文件大小： | 210K |
| 代理商： | LT3506IDHD |
LT3506/LT3506A
16
3506afc
capacitor on RUN/SS2. This allows the LT3506 to start up
and enable its power good comparator before RUN/SS2
gets high enough to allow channel 2 to start switching.
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 VIN1. It is
possible to supply VIN2 from a different source, provided
VIN1 is above the minimum supply level whenever VIN2 is
present. This could be used when a system has two pri-
mary supplies available. It is more efcient to generate the
desired outputs with the lowest step-down ratio possible.
For example, if a system has 18V and 5V power available
and needs to generate 12V and 2.5V, it would be more
efcient 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 efciency 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, VIN2 can be tied to
VOUT1 for applications requiring high VIN to VOUT ratios. A
dual step-down application steps down the input voltage
(VIN1) to the highest output voltage then uses that voltage
to power the second channel (VIN2). VOUT1 must be able
to provide enough current for its output plus the average
current drawn from VOUT2. Note that the VOUT1 must be
above minimum input voltage for VIN2 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.
Figure 6. Shorted Input Protection
VIN
VOUT
SW
LT3506
D4
PARASITIC DIODE
3506 F06
VIN
SW
GND
(7a)
VIN
VSW
C1
D1
C2
3506 F07
L1
SW
GND
(7c)
VIN
SW
GND
(7b)
IC1
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.
APPLICATIONS INFORMATION
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| LT3506IDHD#PBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16DFN 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 |
| LT3506IDHD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 575KHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 575KHZ, DFN-16 |
| LT3506IDHD#TRPBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3506IDHD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506IDHD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
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