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參數(shù)資料
| 型號： | LTC3529EDCB#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 2 X 3 MM, 0.75 MM PITCH, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 206K |
| 代理商： | LTC3529EDCB#PBF |
LTC3529
7
3529fb
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 VIN or VOUT, as long as it
is limited to less than the absolute maximum rating.
Error Amplier
The error amplier is a transconductance amplier with
an internal compensation network. Internal clamps limit
the minimum and maximum error amplier 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 amplier 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
ThecurrentlimitcomparatorshutsofftheN-channelMOSFET
switchwhenthecurrentlimitthresholdisreached.Thecurrent
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 VOUT 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, VOUT should be protected
by the addition of a 5.6V Zener clamp from VOUT to GND.
Alternatively, COUT 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 rectier
when this current falls below approximately 20mA. This
prevents the inductor current from reversing in polarity,
thereby improving efciency 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 CSW (capacitance on the SW pin) is low
energy but can cause EMI radiation.
Output Disconnect
TheLTC3529providestrueoutputdisconnectbyeliminating
body diode conduction of the internal P-channel MOSFET
rectier. This allows VOUT 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 VOUT pin and use very low ESR/ESL
ceramic capacitors tied to a good ground plane.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3530 | 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3530EDD#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LTC3530EDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
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