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參數(shù)資料
| 型號(hào)： | LTC3525DESC6-3.3#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, MO-203AB, EIAJ, SC-70, 6 PIN |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 477K |
| 代理商： | LTC3525DESC6-3.3#PBF |
LTC3525D-3.3
6
3525d33fa
TheLTC3525DisahighperformanceBurstModeoperation
only, synchronous boost converter requiring only three
small external components. Its simplicity and small size
makeitahighefficiencyalternativetochargepumpdesigns.
It is designed to start up from a single alkaline or nickel
cell, with input voltages as low as 0.85V, or from two or
three cells (or a Li-Ion battery), with voltages as high as
4.5V. Once started, VIN can be as low as 0.5V (depend-
ing on load current) and maintain regulation. The output
voltage is preset internally to 3.3V. Peak switch current is
400mA minimum, providing regulation with load currents
up to 150mA, depending on input voltage.
Synchronous rectification provides high efficiency opera-
tion while eliminating the need for an external Schottky
diode.
The LTC3525D can maintain regulation with an input
voltage equal to or greater than VOUT. Note, however, that
the synchronous rectifier is not enabled in this mode,
resulting in lower efficiency and reduced output current
capability.
The operating quiescent current is only 7A typical, allow-
ing the converter to maintain high efficiency at extremely
light loads.
Shutdown
The LTC3525D is shut down by pulling SHDN below 0.4V,
and made active by raising it above 1V. Although SHDN can
be driven above VIN or VOUT (up to the absolute maximum
rating) without damage, the LTC3525D has a proprietary
test mode that may be engaged if SHDN is held in the
range of 0.5V to 1V higher than the greater of VIN or VOUT.
If the test mode is engaged, normal PWM switching ac-
tion is interrupted, which can cause undesirable operation
in some applications. Therefore, in applications where
SHDN may be driven above VIN, a resistor divider or other
means must be employed to keep the SHDN voltage below
(VIN + 0.4V) to prevent the possibility of the test mode
being engaged. Please refer to Figure 1 for two possible
implementations.
After the SHDN pin rises, there is a short delay before
switching starts. The delay is 20s to 120s, depending
on input voltage (see Typical Performance Characteristics
curve).
Pass-Through Mode
WhentheLTC3525Disinshutdown,theinternalP-channel
MOSFET switch is turned on. This allows VIN to be con-
nected to VOUTthroughtheinductorinshutdown,creating
a pass-through mode.
Start-up
Astart-uposcillatorallowstheLTC3525Dtostartwithinput
voltages as low as 1V. It remains in start-up mode until
two conditions are met. VOUT must exceed VIN by at least
0.2V typical and either VIN or VOUT must be greater than
1.8V typical.
During start-up, the synchronous rectifier is not enabled,
and the internal P-channel synchronous rectifier acts
as a follower, causing the peak voltage on SW to reach
(VIN+1V)typical.Thislimitsinrushcurrentbymaintaining
control of the inductor current when VOUT is less than VIN.
ToreducepowerdissipationintheP-channelsynchronous
rectifier when the output is shorted, a foldback feature is
incorporated that reduces the peak inductor current when
VIN is more than 1.7V greater than VOUT.
OPERATION
LTC3525D-3.3
1M
VCNTRL
R
VIN
VCNTRL
SHDN
LTC3525D-3.3
1M
3525d33 F01
ZETEX ZC2811E
R > (VCNTRL/(VIN + 0.4) – 1) M
SHDN
Figure 1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3525ESC6-3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3525ESC6-3#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-UP DC/DC CONVERTER SC70-6 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, SC70-6 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, SC70-6; Primary Input Voltage:1.2V; No. of Outputs:1; Output Voltage:3V; Output Current:400mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LTC3525ESC6-3#TRMPBF | 功能描述:IC REG BOOST SYNC 3V 0.4A SC70-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)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(guān):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(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3525ESC6-3#TRPBF | 功能描述:IC REG BOOST SYNC 3V 0.4A SC70-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):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(guān):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(yīng)商設(shè)備封裝:8-SOIC |
| LTC3525ESC6-3.0 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 |
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