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参数资料
| 型号： | LTC3528EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.6 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1A |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LTC3528/LTC3528B
OPERATION
(Refer to Block Diagram)
SHDN
SHDN
The LTC3528/LTC3528B are 1MHz synchronous boost
converters housed in an 8-lead 3mm × 2mm DFN package.
With the ability to start-up and operate from inputs less
than 0.88V, the devices feature fixed frequency, current
mode PWM control for exceptional line and load regula-
tion. The current mode architecture with adaptive slope
compensation provides excellent transient load response
and requires minimal output filtering. Internal soft-start and
internal loop compensation simplifies the design process
while minimizing the number of external components.
With its low R DS(ON) and low gate charge internal N-channel
MOSFET switch and P-channel MOSFET synchronous
rectifier, the LTC3528 achieves high efficiency over a wide
range of load current. Burst Mode operation maintains
high efficiency at very light loads, reducing the quiescent
current to 12μA. Operation can be best understood by
referring to the Block Diagram.
LOW VOLTAGE START-UP
The LTC3528/LTC3528B includes an independent start-up
oscillator designed to operate at an input voltage of 0.70V
(typical). Soft-start and inrush current limiting are provided
during start-up, as well as normal operating mode.
When either V IN or V OUT exceeds 1.6V typical, the IC enters
normal operating mode. Once the output voltage exceeds
the input by 0.24V, the IC powers itself from V OUT instead of
V IN . At this point the internal circuitry has no dependency
on the V IN input voltage, eliminating the requirement for
a large input capacitor. The input voltage can drop as low
as 0.5V. The limiting factor for the application becomes
the availability of the power source to supply sufficient
power to the output at the low voltages, and the maximum
duty cycle, which is clamped at 93% typical. Note that
at low input voltages, small voltage drops due to series
resistance become critical, and greatly limit the power
delivery capability of the converter.
LOW NOISE FIXED FREQUENCY OPERATION
Soft-Start
The LTC3528/LTC3528B contains internal circuitry to pro-
vide soft-start operation. The internal soft-start circuitry
slowly ramps the peak inductor current from zero to its
peak value of 1.5A (typical), allowing start-up into heavy
loads. The soft-start time is approximately 0.5ms. The
soft-start circuitry is reset in the event of a commanded
shutdown or a thermal shutdown.
Oscillator
An internal oscillator sets the frequency of operation to
1MHz.
Shutdown
The converter is shut down by pulling the SHDN pin below
0.25V, and activated by pulling SHDN above 0.88V. Although
SHDN can be driven above V IN or V OUT (up to the absolute
maximum rating) without damage, the LTC3528/LTC3528B
have a proprietary test mode that may be engaged if
SHDN is held in the range of 0.5V to 1V higher than the
greater of V IN or V OUT . If the test mode is engaged, normal
PWM switching action is interrupted, which can cause
undesirable operation in some applications. Therefore,
in applications where SHDN may be driven above V IN ,
a resistor divider or other means must be employed to
keep the SHDN voltage below (V IN + 0.4V) to prevent the
possibility of the test mode being engaged. Please refer
to Figure 1 for two possible implementations
LTC3528/LTC3528B LTC3528/LTC3528B
V IN
4M 4M
±30% ±30%
3528 F01
R
V CNTRL
1M
ZETEX ZC2811E
R > (V CNTRL /(V IN + 0.4) – 1) M
V CNTRL
1M
Figure 1. Recommended Shutdown Circuits
when Driving SHDN Above V IN
3528fd
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3529EDCB#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-UP DC/DC CONVERTER DFN-8 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 1.5A, 2.35MHz Step-Up DC/DC Converter in 2mm x 3mm 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, DFN-8, Primary Input Voltage:5.25V, No. of Outputs:1, Output Voltage:5V, Output Current:500mA, No. of Pins:8, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3529EDCB#TRMPBF | 功能描述:IC REG BOOST SYNC 5V 1.5A 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 |
| LTC3529EDCB#TRPBF | 功能描述:IC REG BOOST SYNC 5V 1.5A 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: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 |
| LTC3530 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
| LTC3530EDD | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 1.8V to 5.5V 10-Pin DFN EP |
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