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LR8425 Datasheet(PDF) 2 Page - Leshan Radio Company

Part No. LR8425
Description  5A, 500KHz Synchronous Boost Converter with Output Disconnect
Download  7 Pages
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Maker  LRC [Leshan Radio Company]
Homepage  http://www.lrc.cn/
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LR8425 Datasheet(HTML) 2 Page - Leshan Radio Company

   
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ORDER INFORMATION
Device No.
Output Voltage
Package
Packaging
8425AQD10
Adjustable
QFN2.1x2.1-10
3000 parts per reel
8425BQD10
Adjustable
QFN2.1x2.1-10
3000 parts per reel
PIN CONFIGURATION:
Top View
(QFN2.1X2.1-10)
PIN
TYPE
(1)
DESCRIPTION
NO.
NAM E
1
CE
I
Chip Enable Input. Internal integrated with 1Mohm pull down resistor.
CE=High: Normal free running operation.
CE=Low:
Shutdown; quiescent current <1μA. Output capacitor can be
completely discharged through the load or feedback resistors.
If CE is undefined, pin SW may ring.
2
LBI
I
Low Battery Comparator Input (comparator enabled with CE).
3
VIN
I
Battery Supply Input Voltage. The device gets its start-up bias from VIN.
Once AVOUT exceeds 2.3V, bias comes from AVOUT. Thus, once started,
operation is completely independent from VIN. Operation is only limited by
the output power level and the battery’s internal series resistance. The V
IN
pin should be connected to the positive terminal of the battery and
bypassed with a low ESR ceramic bypass capacitor. Care should be taken
to minimize the loop area formed by the bypass capacitor connections,
the VIN pin, and the
8425 AGND pin. The minimum recommended
bypass capacitance is 1
μF ceramic with a X5R or X7R dielectric and the
optimum placement is closest to the VIN pin and the AGND pin.
PCB trace length from VIN to the input filter capacitor(s) should be as short
and wide as possible.
6
5
4
7
8
9
10
1
2
3
LESHAN RADIO COMPANY, LTD.
Ver0.5
27


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