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參數(shù)資料
| 型號(hào)： | LTC3525ESC6-3#TR |
| 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： | PLASTIC, SC70, 6 PIN |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 276K |
| 代理商： | LTC3525ESC6-3#TR |
LTC3525-3/
LTC3525-3.3/LTC3525-5
8
3525fa
OPERATIO
U
The LTC3525 is a high performance Burst Mode operation
only, synchronous boost converter requiring only three
small external components. Its simplicity and small size
make it a high efciency alternative to charge pump designs.
It is designed to start up from a single alkaline or nickel
cell, with input voltages as low as 1V, 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 (depending on
load current) and maintain regulation. The output voltage
is preset internally to either 3V, 3.3V or 5V. Peak switch
current is 400mA minimum, providing regulation with load
currents up to 150mA, depending on input voltage.
Synchronous rectication provides high efciency opera-
tion while eliminating the need for an external Schottky
diode. True output disconnect eliminates inrush current
at start-up, and allows VOUT to be disconnected from VIN,
for zero shutdown current.
The output disconnect feature also allows the LTC3525
to maintain regulation with an input voltage equal to or
greater than VOUT. Note, however, that the synchronous
rectier is not enabled in this mode resulting in lower ef-
ciency and reduced output current capability.
The operating quiescent current is only 7A typical, allow-
ing the converter to maintain high efciency at extremely
light loads.
Shutdown
The LTC3525 is shut down by pulling SHDN below 0.4V,
and made active by raising it above 1V. Note that SHDN
can be driven as high as 6V, however, if it is more than
0.9V above the higher of VIN or VOUT, the SHDN input
current will increase from zero to 1.5A.
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).
Start-up
A start-up oscillator allows the LTC3525 to start with input
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 startup, the synchronous rectier is not enabled,
and the internal P-channel synchronous rectier acts as
a follower, causing the peak voltage on SW to reach (VIN
+ 1V) typical. This limits inrush current by maintaining
control of the inductor current when VOUT is less than VIN.
To reduce power dissipation in the P-channel synchronous
rectier 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.
Normal Operation
Once VOUT has increased more than 0.2V typical above
VIN, and either voltage is above 1.8V, normal operation
begins, with synchronous rectication enabled. In this
mode, the internal N-channel MOSFET connected be-
tween SW and GND stays on until the inductor current
reaches a maximum peak value, after which it is turned
off and the P-channel synchronous rectier is turned
on. It stays on, delivering current to the output, until the
inductor current has dropped below a minimum value at
which point it turns off and the cycle repeats. When the
output voltage reaches its regulated value both switches
are turned off and the LTC3525 goes to sleep, during
which time the output capacitor supplies current to the
load. Once the output voltage drops approximately 9mV
below the regulation value the IC leaves sleep mode and
switching is resumed.
The LTC3525 has been designed for low output voltage
ripple. The output voltage ripple is typically only 20mV
peak-to-peak at light load and 60mV peak-to-peak at
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| LTC3525ESC6-3 | 0.45 A SWITCHING REGULATOR, PDSO6 |
| LTC3525ESC6-3#TRM | 0.45 A SWITCHING REGULATOR, PDSO6 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3525ESC6-5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 |
| LTC3525ESC6-5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 制造商:Linear Technology 功能描述:DC-DC CONVERTER BOOST 5V 175mA SC-70 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 5V, 175mA, SC-70 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 400mA Synch, Boost Converter in SC70 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 5V, 175mA, SC-70-6, Primary Input Voltage:4.5V, No. of Outputs:1, Output Voltage:5V, Output Current:175mA, No. of Pins:6, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3525ESC6-5#TR | 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 400mA Synch, Boost Converter in SC70 |
| LTC3525ESC6-5#TRM | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 T/R |
| LTC3525ESC6-5#TRMPBF | 功能描述:IC REG BOOST SYNC 5V 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)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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