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参数资料
| 型号： | LTC3528EDDB#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 3 X 2 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件页数： | 15/16页 |
| 文件大小： | 316K |
| 代理商： | LTC3528EDDB#TRM |
LTC3528/LTC3528B
8
3528f
OPERATION
The LTC3528/LTC3528B are 1MHz synchronous boost
converters housed in an 8-lead 3mm
×2mmDFNpackage.
With the ability to start-up and operate from inputs less
than 0.88V, the devices feature xed 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 ltering. Internal soft-start and
internal loop compensation simplies the design process
while minimizing the number of external components.
With its low RDS(ON) and low gate charge internal N-chan-
nel MOSFET switch and P-channel MOSFET synchronous
rectier, the LTC3528 achieves high efciency over a wide
range of load current. Burst Mode operation maintains
high efciency 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 VIN or VOUT 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 VOUT instead
of VIN. At this point the internal circuitry has no dependency
on the VIN 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 sufcient
power to the output at the low voltages, and the maximum
duty cycle, which is clamped at 90% 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. Note
that
SHDN can be driven above V
IN or VOUT, as long as it
is limited to less than the absolute maximum rating.
Error Amplier
The error amplier is a transconductance type. The nonin-
verting input is internally connected to the 1.20V reference
and the inverting input is connected to FB. Clamps limit
the minimum and maximum error amp output voltage for
improved large-signal transient response. Power converter
control loop compensation is provided internally. A voltage
divider from VOUT to ground programs the output voltage
via FB from 1.6V to 5.25V.
VV
R
OUT =+
120
1
2
1
.
Current Sensing
Lossless current sensing converts the peak current signal
of the N-channel MOSFET switch into a voltage which
is summed with the internal slope compensation. The
summed signal is compared to the error amplier output to
provide a peak current control command for the PWM.
Current Limit
The current limit comparator shuts off the N-channel
MOSFET switch once its threshold is reached. The current
limit comparator delay to output is typically 60ns. Peak
switch current is limited to approximately 1.5A, indepen-
dent of input or output voltage, unless VOUT falls below
0.7V, in which case the current limit is cut in half.
(Refer to Block Diagram)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3528EDDB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN |
| 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 |
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