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參數(shù)資料
| 型號(hào)： | MAX1722EZK |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| 中文描述： | 1.5uA智商，升壓型DC - DC轉(zhuǎn)換器，在薄型SOT23 - 5 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 292K |
| 代理商： | MAX1722EZK |
M
1.5μA I
Q
, Step-Up DC-DC Converters
in Thin SOT23-5
_______________________________________________________________________________________
7
up voltage is a function of load current (see
Typical
Operating Characteristics
). This circuit is powered from
the BATT pin for the MAX1722/MAX1724, guaranteeing
startup at input voltages as low as 0.91V. The MAX1723
lacks a BATT pin; therefore, this circuit is powered
through the OUT pin. Adding a Schottky diode in paral-
lel with the P-channel synchronous rectifier allows for
startup voltages as low as 1.2V for the MAX1723
(Figure 3). The external Schottky diode is not needed
for input voltages greater than 1.8V. Once started, the
output maintains the load as the battery voltage
decreases below the startup voltage.
Shutdown (MAX1723/MAX1724)
The MAX1723/MAX1724 enter shutdown when the
SHDN
pin is driven low. During shutdown, the body
diode of the P-channel MOSFET allows current to flow
from the battery to the output. V
OUT
falls to approxi-
mately V
IN
- 0.6V and LX remains high impedance.
Shutdown can be pulled as high as 6V, regardless of
the voltage at BATT or OUT. For normal operation, con-
nect
SHDN
to the input.
P
N
CONTROL
LOGIC
STARTUP
CIRCUITRY
DAMPING
SWITCH
DRIVER
GND
SHDN
R
1
R
2
BATT
LX
OUT
CURRENT
LIMIT
MAX1724
ERROR
COMPARATOR
ZERO-
CROSSING
DETECTOR
1.235V REFERENCE
Figure 2. MAX1724 Simplified Functional Diagram
Figure 3. MAX1723 Single-Cell Operation
V
OUT
= 3.6V
1.2V
TO V
OUT
D1
10
μ
H
10
μ
F
R2
2.37M
R1
1.24M
10
μ
F
LX
OUT
SHDN
GND
FB
MAX1723
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MAX1722EZK-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 |
|---|---|
| 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(kāi)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(kāi)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(kāi)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(kāi)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 |
| MAX1723ESA | 制造商:Maxim Integrated Products 功能描述: |
| MAX1723EUK | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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