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參數(shù)資料
| 型號(hào)： | L6920DTR |
| 廠商： | 意法半導(dǎo)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)： | 5/13頁 |
| 文件大?。?/td> | 183K |
| 代理商： | L6920DTR |
5/13
L6920
3
Detailed Description
The L6920 is a high efficiency, low voltage step-up DC/DC converter particularly suitable for 1 to 3 cells (Li-Ion/
polymer, NiMH respectively) battery up conversion.
These performances are achieved via a strong reduction of quiescent current (10
μ
A only) and adopting a syn-
chronous rectification, that implies also a reduced cost in the application (no external diode required).
Operation is based on maximum ON time - minimum OFF time control, tailored by a current limit set to 1A. A
simplified block diagram is shown here below.
Figure 6. Simplified Block Diagram
4
Principle of Operation
In L6920 the control is based on a comparator that continuously checks the status of output voltage.
If the output voltage is lower than the expected value, the control function of the L6920 directs the energy stored
in the inductor to be transferred to the load. This is accomplished by alternating between two basic steps:
- TON phase: the energy is transferred from the battery to the inductor by shorting LX node to ground via the N-
channel power switch. The switch is turned off if the current flowing in the inductor reaches 1A or after a max-
imum on time set to 5
μ
s.
- TOFF phase: the energy stored in the inductor is transferred to the load through the synchronous switch for at
least a minimum off time equal to 1
μ
s. After this, the synchronous switch is turned off as soon as the output
voltage goes lower than the regulated voltage or the current flowing in the inductor goes down to zero.
So, in case of light load, the device works in PFM mode, as shown in figures 7 to 10.
R
Q
S
Ton max
5
μ
sec
Toff min
1
μ
sec
VBG
VBG
VBG
A
B
C
-
+
-
+
-
+
-
+
-
+
VOUT
ZERO CROSSING
OPAMP
(CR)
CURRENT LIMIT
OUT
FB
GND
V
REF
LBI
LBO
D99IN1041
SHDN
LX
V
IN
V
OUT
V
GND
R
1
,R
2
FB
Y
Y
A
B
C
- +
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PDF描述 |
|---|---|
| L6920D | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
| L6920 | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
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| L6925 | HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
| L6925013TR | HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6922-1 | 制造商:Thomas & Betts 功能描述:3/4 CORD GRIP CONNECTOR,EA |
| L6924D | 功能描述:電池管理 Battery charger system RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| L6924D_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Battery charger system with integrated power switch for Li-ION/Li-POLYMER |
| L6924D013TR | 功能描述:電池管理 Battery Charger Sys Li-Ion/Li-Poly RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| L6924U | 功能描述:電池管理 USB Battery Charger System w/integra RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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