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參數(shù)資料
| 型號(hào)： | MAX1676EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | UMAX-10 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | MAX1676EUB |
M
As a result, the synchronous rectifier significantly
improves efficiency without the addition of an external
component. Conversion efficiency can be as high as
94%, as shown in the Typical Operating Characteristics.
For low-voltage inputs from single cells (Alkaline, NiCd,
or NiMH), use an external Schottky diode such as the
1N5817 to ensure start-up.
V oltage Referenc e
The voltage at REF is nominally +1.30V. REF can
source up to 100μA to external circuits. The reference
maintains excellent load regulation (see Typical Oper-
ating Characteristics). A bypass capacitor of 0.1μF is
required for proper operation.
S hutdown
The device enters shutdown when V
SHDN
is low.
During shutdown, the body diode of the P-channel
MOSFET allows current flow from the battery to the out-
put. V
OUT
falls to approximately V
IN
- 0.6V and LX
remains high impedance. The capacitance and load at
OUT determine the rate at which V
OUT
decays.
Shutdown can be pulled as high as 6V, regardless of
the voltage at OUT.
Current Limit S elec t Pin (MAX 1676)
The MAX1676 allows a selectable inductor current limit
of either 0.5A or 1A. This allows flexibility in designing
for higher current applications or for smaller, compact
designs. Connect CLSEL to OUT for 1A or to GND for
0.5A. CLSEL draws 1.4μA when connected to OUT.
BAT T /Damping S witc h (MAX 1676)
The MAX1676 is designed with an internal damping
switch to minimize ringing at LX. The damping switch
connects an external resistor (R1) across the inductor
when the inductor’s energy is depleted (Figure 2).
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 dissipate this
energy, minimizing the ringing at LX. Damping LX ring-
ing does not reduce V
OUT
ripple, but does reduce EMI.
R1 = 200
works well for most applications while reduc-
ing efficiency by only 1%. Larger R1 values provide less
damping, but have less impact on efficiency. Generally,
lower values of R1 are needed to fully damp LX when
the V
OUT
/V
IN
ratio is high (Figures 2, 3, and 4).
High-Effic ienc y, Low-S upply-Current,
Compac t, S tep-Up DC-DC Converters
8
_______________________________________________________________________________________
MAX1676
DAMPING
SWITCH
BATT
R1
200
LX
OUT
22
μ
H
V
IN
0.1
μ
F
47
μ
F
V
OUT
Figure 2. Simplified Diagram of Inductor Damping Switch
2
μ
s/div
V
LX
1V/div
Figure 3. LX Ringing Without Damping Switch
2
μ
s/div
V
LX
1V/div
Figure 4. LX Waveform with Damping Switch (with 200
external resistor)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1676EUB+ | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Compact 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 |
| MAX1676EUB+T | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Compact 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 |
| MAX1676EUB-T | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Compact 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 |
| MAX1676EVKIT | 功能描述:電源管理IC開(kāi)發(fā)工具 Evaluation Kit for the MAX1676 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1677EEE | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC 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 |
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