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参数资料
| 型号： | LTC3529EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 5V 1.5A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 1.8 V ~ 5.25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 1.5A |
| 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） |
LTC3529
OPERATION
Oscillator
An internal oscillator sets the switching frequency to
1.5MHz.
Shutdown
The LTC3529 is shut down by pulling the SHDN pin below
0.35V, and activated by pulling the SHDN pin above 1V. Note
that SHDN can be driven above V IN or V OUT , as long as it
is limited to less than the absolute maximum rating.
Error Ampli?er
The error ampli?er is a transconductance ampli?er with
an internal compensation network. Internal clamps limit
the minimum and maximum error ampli?er output voltage
to improve the large-signal transient response.
Current Sensing
Lossless current sensing converts the peak current sig-
nal of the N-channel MOSFET switch into a voltage that
is summed with the internal slope compensation. The
summed signal is compared to the error ampli?er output
to provide a peak current control command for the PWM.
Peak switch current is limited to approximately 2A inde-
pendent of input or output voltage.
Current Limit
The current limit comparator shuts off the N-channel MOSFET
switch when the current limit threshold is reached. The current
limit comparator delay time to output is typically 40ns.
Fault Detection
To prevent the device from providing power to a shorted
output, the switch current is monitored to detect an
overcurrent condition. In the event that the switch current
reaches the current limit for longer than 22ms, the fault
?ag is asserted ( FAULT pulls low) and the device is shut
down. If the auto-restart option is enabled (RST high), the
device will automatically attempt to restart every 22ms
until the short is removed. If auto-restart is disabled (RST
low), the IC will remain shut down until being manually
restarted by toggling SHDN or cycling the input voltage.
A soft-start sequence is initiated when the device restarts.
If output short-circuits are common in the application,
latchoff mode is highly recommended for maximum level
of robustness.
Note: When V OUT is released from a short-circuit condi-
tion, it is possible for the output to momentarily exceed
the maximum output voltage rating. In cases where
repeated shorts are expected, V OUT should be protected
by the addition of a 5.6V Zener clamp from V OUT to GND.
Alternatively, C OUT can be increased to 47μF or greater.
Zero-Current Comparator
The zero-current comparator monitors the inductor cur-
rent to the output and shuts off the synchronous recti?er
when this current falls below approximately 20mA. This
prevents the inductor current from reversing in polarity,
thereby improving ef?ciency at light loads.
Anti-Ringing Control
The anti-ringing circuit connects a resistor across the
inductor to damp the ringing on SW in discontinuous
conduction mode. The ringing of the resonant circuit
formed by L and C SW (capacitance on the SW pin) is low
energy but can cause EMI radiation.
Output Disconnect
The LTC3529 provides true output disconnect by eliminating
body diode conduction of the internal P-channel MOSFET
recti?er. This allows V OUT to go to zero volts during shut-
down, drawing no current from the input source. It also
provides inrush current limiting at turn-on, minimizing
surge currents seen by the input supply.
Thermal Shutdown
If the die temperature reaches approximately 160°C,
the device enters thermal shutdown, the fault ?ag is
asserted ( FAULT pulls low) and all switches are turned off.
The device is enabled and a soft-start sequence is initiated
when the die temperature drops by approximately 10°C.
PCB Layout
Due to the high frequency operation of the LTC3529, board
layout is extremely critical to minimize transients caused by
stray inductance. Keep the output ?lter capacitor as close
as possible to the V OUT pin and use very low ESR/ESL
ceramic capacitors tied to a good ground plane.
3529fb
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC3530EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN 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 |
| LTC3530EDD#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN 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 |
| LTC3530EDD-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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