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| 型号： | LTC3533EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 14DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 2A |
| 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 14-DFN-EP（4x3） |
LTC3533
OPERATION
For automatic operation a ?lter capacitor must also be
connected from BURST to ground. The equation for the
minimum capacitor value is:
Burst Mode Operation to Fixed Frequency Transient
Response
In Burst Mode operation, the compensation network is
C BURST ( MIN ) ≥
C OUT ? V OUT
60 , 000
not used and V C is disconnected from the error ampli?er.
During long periods of Burst Mode operation, leakage
currents in the external components or on the PC board
where C BURST(MIN) and C OUT are in μF.
In the event that a load transient causes FB to drop by
more than 4% from the regulation value while in Burst
Mode operation, the LTC3533 will immediately switch
to ?xed frequency mode and an internal pull-up will be
momentarily applied to BURST, rapidly charging C BURST .
This prevents the IC from immediately re-entering Burst
mode operation once the output achieves regulation.
Manual Burst Mode Operation
For manual control of Burst Mode operation, the RC
network connected to BURST can be eliminated. To force
?xed frequency mode, BURST should be connected to
V IN . To force Burst Mode operation, BURST should be
grounded. When commanding Burst Mode operation
manually, the circuit connected to BURST should be able
to sink up to 2mA.
For optimum transient response with large dynamic loads,
the operating mode should be controlled digitally by the
host. By commanding ?xed frequency operation prior to a
sudden increase in load, output voltage droop can be mini-
mized. Note that if the load current applied during forced
Burst Mode operation (BURST pin is grounded) exceeds
the current that can be supplied, the output voltage will
start to droop and the LTC3533 will automatically come out
of Burst Mode operation and enter ?xed frequency mode,
raising V OUT . Once regulation is achieved, the LTC3533 will
then enter Burst Mode operation once again (since the user
is still commanding this by grounding BURST), and the
cycle will repeat, resulting in about 4% output ripple.
could cause the compensation capacitor to charge (or
discharge), which could result in a large output transient
when returning to ?xed frequency mode of operation, even
at the same load current. To prevent this, the LTC3533
incorporates an active clamp circuit that holds the voltage
on V C at an optimal voltage during Burst Mode operation.
This minimizes any output transient when returning to
?xed frequency mode operation. For optimum transient
response, Type 3 compensation is also recommended
to broad band the control loop and roll off past the two
pole response of the output LC ?lter. (See Closing the
Feedback Loop).
Soft-Start
The soft-start function is combined with shutdown. When
the RUN/SS pin is brought above 1V typical, the LTC3533
is enabled but the error ampli?er duty cycle is clamped
from V C . A detailed diagram of this function is shown in
Figure 3. The components R SS and C SS provide a slow
ramping voltage on RUN/SS to provide a soft-start function.
To ensure that V C is not being clamped, RUN/SS must be
raised above 1.6V.
V IN
RUN/SS
V C
3533 F03
Figure 3.
3533f
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3534 | 制造商:LINER 制造商全称:Linear Technology 功能描述:40V, 2A Synchronous Buck-Boost DC/DC |
| LTC3534EDHC#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 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 |
| LTC3534EDHC#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 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 |
| LTC3534EGN#PBF | 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3534EGN#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP 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 |
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