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參數(shù)資料
| 型號： | LTC3526LBEDC-2#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 332K |
| 代理商： | LTC3526LBEDC-2#PBF |
LTC3526L-2/LTC3526LB-2
3526lb2fa
exceeds the input by 0.24V, the IC powers itself from
VOUT instead of 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 ap-
plication becomes the availability of the power source to
supply sufficient energy to the output at low voltages, and
maximum duty cycle, which is clamped at 90% 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 LTC3526L-2/LTC3526LB-2 contain internal circuitry
to provide soft-start operation. The soft-start circuitry
slowly ramps the peak inductor current from zero to its
peak value of 750mA (typical) in approximately 0.5ms,
allowing start-up into heavy loads. The soft-start circuitry
is reset in the event of a shutdown command or a thermal
shutdown.
Oscillator
An internal oscillator sets the switching frequency to
2MHz.
Shutdown
Shutdown is accomplished by pulling the SHDN pin
below 0.3V and enabled by pulling the SHDN pin above
0.8V. Although SHDN can be driven above VIN or VOUT
(up to the absolute maximum rating) without damage,
the LTC3526L-2/LTC3526LB-2 have 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 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.
Error Amplifier
The positive input of the transconductance error amplifier
is internally connected to the 1.195V reference and the
negative input is connected to FB. Clamps limit the mini-
mumandmaximumerrorampoutputvoltageforimproved
large-signal transient response. Power converter control
loop compensation is provided internally. An external
resistive voltage divider from VOUT to ground programs
the output voltage via FB from 1.5V to 5.25V.
V
R
OUT =
+
1 195
1
2
1
.
Current Sensing
Losslesscurrentsensingconvertsthepeakcurrentsignalof
theN-channelMOSFETswitchintoavoltagethatissummed
with the internal slope compensation. The summed signal
is compared to the error amplifier output to provide a peak
current control command for the PWM.
Current Limit
The current limit comparator shuts off the N-channel
MOSFET switch once its threshold is reached. The cur-
rent limit comparator delay to output is typically 60ns.
Peak switch current is limited to approximately 750mA,
independent of input or output voltage, unless VOUT falls
below 0.7V, in which case the current limit is cut in half.
(Refer to Block Diagram)
operaTion
ZETEX ZC2811E
3526lb2 F01
LTC3526L-2/LTC3526LB-2
SHDN
VIN
VCNTRL
4M
±30%
LTC3526L-2/LTC3526LB-2
SHDN
4M
±30%
1M
R
VCNTRL
1M
R > (VCNTRL/(VIN + 0.4) – 1)M
Figure 1. Recommended Shutdown Circuits when Driving
SHDN above VIN
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3526LBEDC-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526LBEDC-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526LEDC#PBF | 制造商:Linear Technology 功能描述:BOOST SYNCH 0.5A 1MHZ 6DFN 制造商:Linear Technology 功能描述:BOOST, SYNCH, 0.5A, 1MHZ, 6DFN |
| LTC3526LEDC#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 0.55A 6DFN 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(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: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 |
| LTC3526LEDC#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 0.55A 6DFN 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(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: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 |
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