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参数资料
| 型号： | LTC3530EMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.6A 10MSOP |
| 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： | 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LTC3530
OPERATION
The ef?ciency below 1mA becomes dominated primarily
by the quiescent current. The Burst Mode operation ef-
?ciency is given by:
Manual Burst Mode Operation
For manual control of Burst Mode operation, the RC
network connected to BURST can be eliminated. To force
EFFICIENCY
?I LOAD
40 μ A + I LOAD
?xed frequency mode, BURST should be connected to
V IN . To force Burst Mode operation, BURST should be
grounded. When commanding Burst Mode operation
where η is typically 90% during Burst Mode operation.
Automatic Burst Mode Operation Control
Burst Mode operation can be automatic or manually con-
trolled with a single pin. In automatic mode, the IC will
enter Burst Mode operation at light load and return to ?xed
frequency operation at heavier loads. The load current at
which the mode transition occurs is programmed using a
single external resistor from BURST to ground, according
to the following equations:
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 manually by the
host. By commanding ?xed frequency operation prior to
a sudden increase in load, output voltage droop can 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
Enter Burst Mode: I BURST =
8.8
R BURST
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
Leave Burst Mode: I BURST = 11.2
R BURST
where R BURST is in k Ω and I BURST is the load transition
current in Amps. Do not use values of R BURST greater
than 500k Ω .
For automatic operation, a ?lter capacitor must also be
connected from BURST to ground. The equation for the
minimum capacitor value is:
repeat, resulting in about 4% output ripple.
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
C BURST(MIN)
C OUT ? V OUT
60,000
when returning to ?xed frequency mode of operation, even
at the same load current. To prevent this, the LTC3530
incorporates an active clamp circuit that holds the voltage
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 IC 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
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 under Applications Information.
from immediately re-entering Burst Mode operation once
the output achieves regulation.
3530fb
9
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| LTC3531EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 8DFN 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 |
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