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LR8425 Datasheet(PDF) 3 Page - Leshan Radio Company

Part No. LR8425
Description  5A, 500KHz Synchronous Boost Converter with Output Disconnect
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Maker  LRC [Leshan Radio Company]
Homepage  http://www.lrc.cn/
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LR8425 Datasheet(HTML) 3 Page - Leshan Radio Company

   
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4
PGND
P
Power Ground. Ground connection for high-current power converter
node. High current return for the low-side driver and power main switch
N-MOSFET. Connect PGND with large copper areas directly to the input
and output supply returns and negative terminals of the input and output
filter capacitor(s).
Tie this pin to the ground island/plane through the lowest impedance
connection available.
Connect this pin to AGND.
5
SW
I
Boost and Rectifying Switch Input. Connect an inductor between this
pin and VIN. Keep the PCB trace lengths as short and wide as is practical
to reduce EMI and voltage overshoot. If the inductor current falls to zero,
or pin CE is low, an internal anti-ringing switch is connected from this pin
to VIN to minimize EMI.
6
PVOUT
O
DC-DC Power Output (Drain of the Internal Synchronous Rectifier
P-MOSFET). PCB trace length from PVOUT to the output filter capacitor(s)
should be as short and wide as possible. Care should be taken to
minimize the loop area formed by the output filter capacitor(s)
connections, the PVOUT pin, and the
8425 PGND pin. The minimum
recommended output filter capacitance is 22
μF ceramic with a X5R or
X7R dielectric and the optimum placement is closest to the PVOUT pin and
the PGND pin. PVOUT is completely disconnected from VIN when CE is low,
due to the output disconnect feature.
7
AVOUT
I
IC Supply Voltage and Output Voltage Sense Input. Bias is derived
from AVOUT when AVOUT exceeds 2.3V. The AVOUT pin should be
connected to the DC-DC power output pin, PVOUT, and bypassed with a
low ESR ceramic bypass capacitor for noise immunity consideration. Care
should be taken to minimize the loop area formed by the bypass capacitor
connections, the AVOUT 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 AVOUT pin and the
AGND pin.
PCB trace length from AVOUT to the output filter capacitor(s) should be as
short and wide as possible. AVOUT is also completely disconnected from
VIN when CE is low, due to the output disconnect feature.
8
FB
I
Feedback Input.
Feedback Input to the gm Error Amplifier. Connect resistor divider tap to
this pin.
The output voltage can be adjusted from 2.5V to 5.5V by:
VOUT =1.2V [1+(R1/R2)]
The feedback networks should be connected directly to a dedicated
analog ground plane and this ground plane must connect to the AGND
pin. If no analog ground plane is available, then the ground connection of
LESHAN RADIO COMPANY, LTD.
Ver0.5
3/7


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