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參數(shù)資料
| 型號(hào)： | MAX1796 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320VC33 : Digital Signal Processor 132-BQFP |
| 中文描述： | 低電流、升壓型DC-DC轉(zhuǎn)換器，可真正關(guān)斷 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 397K |
| 代理商： | MAX1796 |
Synchronous Rectification
The internal synchronous rectifier eliminates the need
for an external Schottky diode, reducing cost and
board space. During the cycle off-time, the P-channel
MOSFET turns on and shunts the MOSFET body diode.
As a result, the synchronous rectifier significantly
improves efficiency without the addition of an external
component. Conversion efficiency can be as high
as 95%, as shown in the
Typical Operating Char-
acteristics
.
Shutdown
The device enters shutdown when V
SHDN
is high,
reducing supply current to less than 2μA. During shut-
down, the synchronous rectifier disconnects the output
from the input, eliminating the DC conduction path that
normally exists with traditional boost converters in shut-
down mode. In shutdown, OUT becomes a high-imped-
ance node. The LBI/LBO comparator remains active in
shutdown.
As shown in Figure 1, the MAX1795/MAX1796/MAX1797
may be automatically shut down when the input voltage
drops below a preset threshold by connecting LBO to
SHDN (
see Low-Battery Detection
section
).
BATT/Damping Switch
The MAX1795/MAX1796/MAX1797 each contain an
internal damping switch to minimize ringing at LX. The
damping switch connects a resistor across the inductor
when the inductor
’
s energy is depleted (Figure 3).
Normally, 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 ringing continues until the energy is dissi-
pated through the series resistance of the inductor.
The damping switch supplies a path to quickly dissi-
M
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
_______________________________________________________________________________________
9
Figure 2. Functional Diagram
MAX1795
MAX1796
MAX1797
Q
S
R
+
_
+
_
+
_
Q
S
R
Q
S
R
+
+
FB SELECT
OUT
START
TIMER BLOCK
LBO
LBI
R1
1M
TON MAX
TOFF
MAX
R2
FB
ERROR
AMPLIFIER
CURRENT-LIMIT
AMPLIFIER
BATT
BATT
BODY
DIODE
CONTROL
OUT
R3
REFERENCE
22μH
47μF
47μF
GND
LX
BATT
OUT
SHDN
0.85V
-
+
ZERO-
CROSSING
AMPLIFIER
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1797 | Replaced by TMS320C6722B : Digital Signal Processor 144-QFP |
| MAX1795EUA | Low Supply Current, Step-Up DC-DC Converters with True-Shutdown |
| MAX1796EUA | Low Supply Current, Step-Up DC-DC Converters with True-Shutdown |
| MAX1797EUA | Low Supply Current, Step-Up DC-DC Converters with True-Shutdown |
| MAX1798 | Replaced by TMS320C6722B : Digital Signal Processor 144-QFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1796EUA | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1796EUA+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1796EUA+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1796EUA-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Low-Supply Current Step-Up DC/DC Conv 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 |
| MAX1797EUA | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Low-Supply Current Step-Up DC/DC Conv 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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