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參數(shù)資料
| 型號(hào)： | LTC3528EDDB-2#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件頁數(shù)： | 24/24頁 |
| 文件大小： | 0K |
| 代理商： | LTC3528EDDB-2#TRMPBF |
LTC3528-2
9
35282fa
OPERATION
The LTC3528-2 is a 2MHz synchronous boost converter
housed in an 8-lead 3mm
× 2mm DFN package. With the
ability to start up and operate from inputs less than 0.88V,
the device features fixed frequency, current mode PWM
control for exceptional line and load regulation. The cur-
rent mode architecture with adaptive slope compensation
provides excellent transient load response and requires
minimal output filtering. Internal soft-start and internal
loop compensation simplifies the design process while
minimizing the number of external components.
WithitslowRDS(ON)andlowgatechargeinternalN-channel
MOSFETswitchandP-channelMOSFETsynchronousrecti-
fier, the LTC3528-2 achieves high efficiency over a wide
range of load current. The LTC3528-2 features continuous
2MHz PWM operation over a wide range of load current.
At very light loads, the LTC3528-2 will enter Burst Mode
operation to maintain high efficiency. Operation can be
best understood by referring to the Block Diagram.
LOW VOLTAGE START-UP
TheLTC3528-2includesanindependentstart-uposcillator
designed to operate at an input voltage of 0.70V (typical).
Soft-start and inrush current limiting are provided during
start-up, as well as normal operating mode.
WheneitherVINorVOUTexceeds1.6Vtypical,theICenters
normal operating mode. Once the output voltage exceeds
theinputby0.24V,theICpowersitselffromVOUTinsteadof
VIN. At this point the internal circuitry has no dependency
on the VIN input voltage, eliminating the requirement for
a large input capacitor. The input voltage can drop as low
as 0.5V. The limiting factor for the application becomes
the availability of the power source to supply sufficient
power to the output at the low voltages, and the maximum
duty cycle, which is clamped at 92% typical. Note that
at low input voltages, small voltage drops due to series
resistance become critical, and greatly limit the power
delivery capability of the converter.
LOW NOISE FIXED FREQUENCY OPERATION
Soft-Start
The LTC3528-2 contains internal circuitry to provide soft-
start operation. The internal soft-start circuitry slowly
ramps the peak inductor current from zero to its peak
value of 1.5A (typical), allowing start-up into heavy loads.
The soft-start time is approximately 0.5ms. The soft-start
circuitry is reset in the event of a commanded shutdown
or a thermal shutdown.
Oscillator
An internal oscillator sets the frequency of operation to
2MHz.
Shutdown
The converter is shut down by pulling the SHDN pin below
0.25V,andactivatedbypullingSHDNabove0.88V.Although
SHDN can be driven above VIN or VOUT (up to the absolute
maximum rating) without damage, the LTC3528-2 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
action is interrupted, which can cause undesirable opera-
tioninsomeapplications.Therefore,inapplicationswhere
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
(Refer to Block Diagram)
4M
±30%
SHDN
LTC3528-2
R
1M
VCNTRL
4M
±30%
SHDN
LTC3528-2
ZETEX ZC2811E
R > (VCNTRL/(VIN + 0.4) – 1) M
VIN
1M
3528 F01
Figure 1. Recommended Shutdown Circuits
when Driving SHDN Above VIN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3528EDDB-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN |
| LTC3528EDDB-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN |
| LTC3529EDCB#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-UP DC/DC CONVERTER DFN-8 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 1.5A, 2.35MHz Step-Up DC/DC Converter in 2mm x 3mm 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, DFN-8, Primary Input Voltage:5.25V, No. of Outputs:1, Output Voltage:5V, Output Current:500mA, No. of Pins:8, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3529EDCB#TRMPBF | 功能描述:IC REG BOOST SYNC 5V 1.5A 8DFN 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 |
| LTC3529EDCB#TRPBF | 功能描述:IC REG BOOST SYNC 5V 1.5A 8DFN 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 |
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