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參數(shù)資料
| 型號： | LTC3405AES6-1.5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| 中文描述： | 0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 235K |
| 代理商： | LTC3405AES6-1.5 |
7
LTC3405A-1.5/LTC3405A-1.8
sn3405a1518 3405a1518fs
OPERATIOU
When the converter is in Burst Mode operation, the peak
current of the inductor is set to approximately 100mA re-
gardless 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
20
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 signaling the BURST comparator to trip and turn
the top MOSFET on. This process repeats at a rate that is
dependent on the load demand.
(Refer to Functional Diagram)
Short-Circuit Protection
When the output is shorted to ground, the frequency of the
oscillator is reduced to about 210kHz, 1/7 the nominal
frequency. This frequency foldback ensures that the in-
ductor current has more time to decay, thereby preventing
runaway. The oscillator’s frequency will progressively
increase to 1.5MHz when V
OUT
rises above 0V.
Low Supply Operation
The LTC3405A series parts will operate with input supply
voltages as low as 2.5V, but the maximum allowable
output current is reduced at this low voltage. Figure 2
shows the reduction in the maximum output current as a
function of input voltage for both fixed output voltages.
Figure 2. Maximum Output Current vs Input Voltage
SUPPLY VOLTAGE (V)
2.5
M
600
500
400
300
200
100
0
3.0
3.5
4.0
4.5
3405A1518
F02
5.0
5.5
V
OUT
= 1.8V
V
OUT
= 1.5V
Slope Compensation and Inductor Peak Current
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%. Normally, this
results in a reduction of maximum inductor peak current
for duty cycles >40%. However, the LTC3405A series
parts use a patent-pending scheme that counteracts this
compensating ramp, which allows the maximum inductor
peak current to remain unaffected throughout all duty
cycles.
相關PDF資料 |
PDF描述 |
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| LTC3405AES6-1.8 | 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
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| LTC3405A | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
| LTC3405A-1.8 | 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| LTC3406BES5 | 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3405AES618 | 制造商:Linear Technology 功能描述: |
| LTC3405AES6TRMPBF | 制造商:Linear Technology 功能描述:LTC3405A adj 300mA SD dc-dc converter |
| LTC3405ES6 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 6-Pin TSOT-23 |
| LTC3405ES6#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 6-Pin TSOT-23 |
| LTC3405ES6#TR | 功能描述:IC REG BUCK SYNC ADJ .3A SOT23-6 RoHS:否 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:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關:900kHz 電流 - 輸出:100mA 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:SOT-23-6 細型，TSOT-23-6 包裝:帶卷 (TR) 供應商設備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
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