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參數資料
| 型號： | LTC3409 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | DRAM |
| 英文描述： | 64 x 18 3.3-V asynchronous FIFO memory 56-SSOP 0 to 70 |
| 中文描述： | 600mA的低輸入電壓降壓穩(wěn)壓器x 3mm DFN封裝采用3mm |
| 文件頁數： | 9/16頁 |
| 文件大?。?/td> | 246K |
| 代理商： | LTC3409 |
9
LTC3409
3409f
skipping mode is lower output ripple and less interference
to audio circuitry. When the converter is in Burst Mode
operation, the minimum peak current of the inductor is set
to approximately 200mA regardless of the output load.
Each burst event can last from a few cycles at light loads
to almost continuously cycling with short sleep intervals
at moderate loads. In between these burst events, the
power MOSFETs and any unneeded circuitry are turned
off, reducing the quiescent current to 65
μ
A. In this sleep
state, the load current is being supplied solely from the
output capacitor. As the output voltage droops, the EA
amplifier’s output rises above the sleep threshold signal-
ing the BURST comparator to trip and turn the top MOSFET
on. This process repeats at a rate that is dependent on the
load demand.
Short-Circuit Protection
When the output is shorted to ground the LTC3409 limits
the synchronous switch current to 1.5A. If this limit is
exceeded, the top power MOSFET is inhibited from turn-
ing on until the current in the synchronous switch falls
below 1.5A.
Dropout Operation
As the input supply voltage decreases to a value ap-
proaching the output voltage, the duty cycle increases
toward the maximum on-time. Further reduction of the
supply voltage forces the main switch to remain on for
more than one cycle.
OPERATIOU
Slope Compensation
Slope compensation provides stability in constant fre-
quency architectures by preventing subharmonic oscilla-
tions at high duty cycles. It is accomplished internally by
adding a compensating ramp to the inductor current
signal at duty cycles in excess of 40%.
User Controlled Switching Frequency
The internal oscillator of the LTC3409 can be synchronized
to a user-supplied external clock applied to the SYNC pin.
Alternately, when this pin is held at a fixed High or Low
level for more than 30
μ
s, the internal oscillator will revert
to fixed-frequency operation; where the frequency may be
selected as 1.7MHz (SYNC Low) or 2.6MHz (SYNC High).
Internal Soft-Start
At start-up when the RUN pin is brought high, the internal
reference is linearly ramped from 0V to 0.613V in 1ms. The
regulated feedback voltage will follow this ramp resulting
in the output voltage ramping from 0% to 100% in 1ms.
The current in the inductor during soft-start will be defined
by the combination of the current needed to charge the
output capacitance and the current provided to the load as
the output voltage ramps up. The start-up waveform,
shown in the Typical Performance Characteristics, shows
the output voltage start-up from 0V to 1.5V with a 2.5
load and V
IN
= 2.2V. The 2.5
load results in an output of
600mA at 1.5V.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC3409A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
| LTC3409AEDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
| LTC3409AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC3409AEDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC3409AIDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
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