MAX866 Просмотр технического описания (PDF) - Maxim Integrated
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MAX866 Datasheet PDF : 12 Pages
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3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
Table 2. Surface-Mount Inductor Information
MANUFACTURER /PART
INDUCTANCE
(mH)
RESISTANCE
(W)
RATED CURRENT
(A)
HEIGHT
(mm)
Sumida CD73-331
330
Sumida CD104-331
330
Murata-Erie LQH4N331K04M00**
330
TDK NLC565050T-331K**
330
Coilcraft D01608-334
330
Coilcraft DT1608-334
330*
Coilcraft D03316-334
330
Coilcraft DT3316-334
330*
J.W. Miller PM105-331K
330
* Shielded
** Low cost
tolerate higher output ripple. Values in the 10µF to 47µF
range are recommended.
The equivalent series resistance (ESR) of both bypass
and filter capacitors affects efficiency and output ripple.
Use low-ESR capacitors for best performance, or con-
nect two or more filter capacitors in parallel. Low-ESR,
SMT tantalum capacitors are currently available from
Sprague (595D series) and AVX (TPS series). See
Table 1 for a list of suggested capacitor suppliers.
Rectifier Diode
For optimum performance, a switching Schottky diode
(such as the 1N5817 or MBR0520LTI) is recommended.
Refer to Table 1 for a list of component suppliers. For
low output power applications, a PN-junction switching
diode (such as the 1N4148) will also work well,
although its greater forward voltage drop will reduce
efficiency and raise the start-up voltage.
PC Layout and Grounding
The circuit’s high-frequency operation makes PC layout
important for minimizing ground bounce and noise.
Keep the IC’s GND pin and the ground leads of C1 and
C2 (Figure 2) less than 0.2in (5mm) apart. Also keep all
connections to the FB and LX pins as short as possible.
To maximize output power and efficiency and minimize
output ripple voltage, use a ground plane and solder
the IC’s GND (pin 7) directly to the ground plane.
1.5
0.28
3.5
1.1
0.42
4
8.2
0.095
2.6
4.9
0.14
5
2.9
0.16
3.2
2.9
0.16
3.2
0.7
0.6
5.4
0.7
0.6
5.4
1.1
0.52
5.4
___________________Chip Topography
LX
SHDN
3/5
OR FB*
REF
GND 0.084"
(2.1336mm)
OUT
LBO
LBI
0.058"
(1.4732mm)
*3/5 FOR MAX866; FB FOR MAX867.
TRANSISTOR COUNT: 357;
SUBSTRATE IS CONNECTED TO OUT.
______________________________________________________________________________________ 11
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