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| 型号： | LTC3530EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16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： | 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-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： | 1334 (CN2011-ZH PDF) |
LTC3530
OPERATION
Depending on the control voltage, the IC will operate in
either buck, buck/boost or boost mode. The V CI voltage
is a level shifted voltage from the output of the error amp
(V C ). The four power switches are properly phased so the
transfer between operating modes is continuous, smooth
and transparent to the user. When V IN approaches V OUT
the buck/boost region is reached where the conduction
time of the four switch region is typically 150ns. Referring
to Figures 1 and 2, the various regions of operation will
now be described.
Buck Region (V IN > V OUT )
Switch D is always on and switch C is always off during
this mode. When the internal control voltage, V CI , is above
voltage V1, output A begins to switch. During the off-time of
switch A, synchronous switch B turns on for the remainder
of the time. Switches A and B will alternate similar to a
typical synchronous buck regulator. As the control volt-
age increases, the duty cycle of switch A increases until
the maximum duty cycle of the converter in buck mode
reaches D MAX_BUCK , given by:
D MAX_BUCK = 100 – D4 SW %
where D4 SW = duty cycle % of the four switch range.
D4 SW = (150ns ? f) ? 100 %
where f = operating frequency, Hz.
Beyond this point the “four switch,” or buck/boost region
is reached.
Buck/Boost or Four Switch (V IN ≈ V OUT )
When the internal control voltage, V CI , is above voltage
V2, switch pair AD remain on for duty cycle D MAX_BUCK ,
and the switch pair AC begins to phase in. As switch pair
The point at which the four switch region ends is given
by:
V IN = V OUT (1 – D) = V OUT (1 – 150ns ? f) V
Boost Region (V IN < V OUT )
Switch A is always on and switch B is always off during
this mode. When the internal control voltage, V CI , is above
voltage V3, switch pair CD will alternately switch to provide
a boosted output voltage. This operation is typical of a
synchronous boost regulator. The maximum duty cycle
of the converter is limited to 90% typical and is reached
when V CI is above V4.
BURST MODE OPERATION
Burst mode reduces the LTC3530’s quiescent current
consumption at light loads and improves overall conver-
sion ef?ciency, increasing battery life. During Burst Mode
operation the LTC3530 delivers energy to the output until
it is regulated and then goes into sleep mode where the
outputs are off and quiescent current drops to 40μA (typ).
In this mode the output ripple has a variable frequency
component that depends upon load current, and will
typically be about 2% peak-to-peak. Burst Mode opera-
tion ripple can be reduced slightly by using more output
capacitance (47μF or greater). Another method of reducing
Burst Mode operation ripple is to place a small feed-forward
capacitor across the upper resistor in the V OUT feedback
divider network (as in Type III compensation).
During the period where the device is delivering energy to
the output, the peak switch current will be equal to 450mA
typical and the inductor current will terminate at zero
current for each cycle. In this mode the typical maximum
average output current is given by:
;V OUT < V IN
;V OUT > V IN
450mA V IN
AC phases in, switch pair BD phases out accordingly.
When the V CI voltage reaches the edge of the buck/boost
range, at voltage V3, the AC switch pair completely phase
out the BD pair, and the boost phase begins at duty cycle
D4 SW . The input voltage, V IN , where the four switch region
begins is given by:
I MAX(BURST)BUCK
I MAX(BURST)BOOST
450mA
2
2 V OUT
?
V IN =
V OUT
1– (150ns ? f)
I MAX(BURST) Buck-Boost ≈ 350mA; V OUT ≈ V IN .
Since the input and output are connected together for
most of the cycle.
3530fb
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3530EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
| LTC3530EMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
| LTC3530EMS#PBF | 功能描述:IC REG BUCK BST SYNC 0.6A 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 |
| LTC3530EMS#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.6A 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: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 |
| LTC3530EMS-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
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