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| 型号： | LTC3532EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 10DFN |
| 标准包装： | 121 |
| 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： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3532
OPERATIO
be minimized. 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 IC will automatically come out
of Burst Mode operation and enter ?xed frequency mode,
raising V OUT . Once regulation is achieved, the IC will then
enter Burst Mode operation once again, and the cycle will
repeat, resulting in about 4% output ripple. Note that Burst
Mode operation is inhibited during soft-start.
Burst Mode Operation to Fixed Frequency Transient
Response
In Burst Mode operation, the compensation network is
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
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 LTC3532
V IN
15μA
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 SHDN /SS pin is brought above 1V typical, the IC is
enabled but the EA duty cycle is clamped from V C . A de-
tailed diagram of this function is shown in Figure 5. The
components R SS and C SS provide a slow ramping voltage
on SHDN /SS to provide a soft-start function. To ensure
that V C is not being clamped, SHDN /SS must be raised
above 2.4V. To enable Burst Mode operation, SHDN /SS
must be raised to within 0.5V of V IN .
ERROR AMP
+
–
1.22V
FB
9
V OUT
R1
TO PWM
V CI
SOFT-START
CLAMP
V C
10
C P1
R2
COMPARATORS
SHDN /SS
8
R SS
ENABLE SIGNAL
CHIP
ENABLE
+
–
1V
C SS
3532 F05
Figure 5. Soft-Start Circuitry
3532fc
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3532EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter |
| LTC3532EMS | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 10-Pin MSOP |
| LTC3532EMS#PBF | 功能描述:IC REG BUCK BST SYNC 0.5A 10MSOP 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 |
| LTC3532EMS#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 10-Pin MSOP T/R |
| LTC3532EMS#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.5A 10MSOP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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