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參數(shù)資料
| 型號： | L6920D |
| 廠商： | 意法半導體 |
| 英文描述： | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
| 中文描述： | 1V的高效SYNCRONOUS升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 166K |
| 代理商： | L6920D |
7/12
L6920
Figure 6. No regulation. I
load
> I
load_lim
Trace1:
V
out
(100mV~/div) Trace 4: I
L
(200mA/div).
Time div.: 5
μ
s/div
Start-up
One of the key features of L6920 is the startup at sup-
ply voltage down to 1V (please see the diagram in
Figure 3. in case of heavy load).
The device leaves the startup mode of operation as
soon as VOUT goes over 1.4V. During startup, the
synchronous switch is off and the energy is trans-
ferred to the load through its intrinsic body diode.
The N-channel switches with a very low RDSon
thanks to an internal charge pump used to bias the
power mos gate. Because of this modified behavior,
TON/TOFF times are lengthened. Current limit and
zero crossing detection are still available.
Shutdown
In shutdown mode (
SHDN
pulled low) all internal cir-
cuitries are turned off, minimizing the current provid-
ed by the battery (I
SHDN
< 100 nA, in typical case).
Both switches are turned off, and the low battery
comparator output is forced in high impedance state.
The synchronous switch body diode causes a para-
sitic path between power supply and output that can't
be avoided also in shutdown.
Low battery detection
The L6920 includes a low battery detector compara-
tor. Threshold is VREF voltage and a 1.3% hystere-
sis is added to avoid oscillations when input crosses
the threshold slowly. The
LBO
is an open drain out-
put so a pull up resistor is required for a proper use.
Reverse polarity
A protection circuit has been implemented to avoid
that L6920 and the battery are destroyed in case of
wrong battery insertion.
In addition, this circuit has been designed so that the
current required by the battery is zero also in reverse
polarity.
APPLICATION INFORMATION
Output voltage selection
Output voltage must be selected acting on FB pin.
Three choices are available: fixed 3.3V, 5V or adjust-
able output set via an external resistor divider.
OUTPUT VOLTAGE SELECTION
V
OUT
= 3.3V
FB pin connected to OUT (see
application circuit)
V
OUT
= 5V
FB pin connected to GND
2V
≤
V
OUT
≤
5.2V
FB pin connected to a resistive
divider
V
OUT
1.23V 1
R5
-------
+
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6920DB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Synchronous Rectifer Step Up 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 安裝風格:SMD/SMT |
| L6920DBTR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 SYNCRONOUS RECT. STEP UP 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 安裝風格:SMD/SMT |
| L6920DC | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Sync Rectifier Step Up Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L6920DCTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Sync Rectifier Step Up Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L6920DTR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.6 to 5.5V Step-Up 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 安裝風格:SMD/SMT |
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