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參數(shù)資料
| 型號(hào)： | MAX1722 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP -40 to 85 |
| 中文描述： | 1.5µA IQ、升壓型DC-DC轉(zhuǎn)換器，薄型SOT23-5封裝 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 292K |
| 代理商： | MAX1722 |
M
1.5μA I
Q
, Step-Up DC-DC Converters
in Thin SOT23-5
8
_______________________________________________________________________________________
BATT/Damping Switch
(MAX1722/MAX1724)
The MAX1722/MAX1724 include an internal damping
switch (Figure 4) to minimize ringing at LX and reduce
EMI. When the energy in the inductor is insufficient to
supply current to the output, the capacitance and
inductance at LX form a resonant circuit that causes
ringing. The damping switch supplies a path to quickly
dissipate this energy, suppressing the ringing at LX.
This does not reduce the output ripple, but does
reduce EMI with minimal impact on efficiency. Figures
5 and 6 show the LX node voltage waveform without
and with the damping switch, respectively.
Design Procedure
Setting the Output Voltage
(MAX1722/MAX1723)
The output voltage can be adjusted from 2V to 5.5V
using external resistors R1 and R2 (Figure 7). Since FB
leakage is 20nA (max), select feedback resistor R1 in
the 100k
to 1M
range. Calculate R2 as follows:
where V
FB
= 1.235V.
R
R
V
V
OUT
FB
2
1
1
=
MAX1722
MAX1724
PDRV
DAMP
NDRV
TIMING
CIRCUIT
OUT
V
OUT
V
IN
BATT
LX
DAMPING
SWITCH
GND
P
N
1
μ
s/div
1V/div
1
μ
s/div
1V/div
Figure 6. LX Ringing With Damping Switch (MAX1722/MAX1724)
Figure 5. LX Ringing Without Damping Switch (MAX1723)
Figure 4. Simplified Diagram of Damping Switch
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1722EZK | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| MAX1723 | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| MAX1723EZK | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP 0 to 0 |
| MAX1724 | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP -40 to 85 |
| MAX1723EZK-T | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1722EUK-T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX1722EZK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX1722EZK+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 5PIN TSOT-23 - Rail/Tube |
| MAX1722EZK+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5uA IQ Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1722EZK-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5uA IQ Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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