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LR8501 Datasheet(PDF) 9 Page - Leshan Radio Company

Part No. LR8501
Description  1.5MHz 600mA Synchronous Step-Down Converter with Low Quiescent Current
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Maker  LRC [Leshan Radio Company]
Homepage  http://www.lrc.cn/
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LR8501 Datasheet(HTML) 9 Page - Leshan Radio Company

 
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style inductor to use often depends more on the
price vs. size requirements and any radiated
field/EMI requirements than on what the LR8501
requires to operate. Table 3 shows some typical
surface mount inductors that work well in LR8501
applications.
Table 3.Representative Surface Mount Inductors
PART
NUMBER
VALUE
(μH)
MAX
DCR
(mΩ)
MAX DC
CURRENT
(A)
SIZE
W×L×H
(mm
3)
Sumida
CDRH
3D16
2.2
3.3
4.7
75
110
162
1.20
1.10
0.90
3.8×3.8
×
1.8
Sumida
CR43
2.2
3.3
4.7
71.2
86.2
108.7
1.75
1.44
1.15
4.5×4.0
×
3.5
Sumida
CDRH
4D18
2.2
3.3
4.7
75
110
162
1.32
1.04
0.84
4.7×4.7
×
2.0
OUTPUT CAPACITOR SELECTION
The selection of COUT is driven by the
required
effective
series
resistance
(ESR).
Typically, once the ESR requirement for COUT has
been met, the RMS current rating generally far
exceeds the IRIPPLE requirement. The output ripple
VOUT is determined by:
∆VOUT
∆IL ESR
1
8fCOUT
Where f = operating frequency, COUT = output
capacitance and
I
L = ripple current in the
inductor. For a fixed output voltage, the output
ripple is highest at maximum input voltage since
I
L increase with input voltage. Ceramic
capacitors with X5R or X7R dielectrics are
recommended due to their low ESR and high
ripple current.
PCB LAYOUT GUIDANCE
When laying out the printed circuit board, the
following suggestions should be taken to ensure
proper operation of the LR8501.
1. The power traces, including the GND trace,
the SW trace and the VIN trace should be kept
short, direct and wide to allow large current
flow. Put enough multiply-layer pads when
they need to change the trace layer.
2. Keep the switching node, SW, away from the
sensitive FB node.
3. The FB pin should directly connect to the
feedback resistors. The resistive divider
R1/R2 must be connected between the (+)
plate of COUT and ground.
4. Connect the (+) plate of CIN to the VIN pin as
closely as possible.
5. Keep the (-) plate of CIN and COUT as close as
possible.
Figure 2a LR8501-1.8V Layout
LESHAN RADIO COMPANY, LTD.
9/11


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