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參數(shù)資料
| 型號： | MAX1939EEI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, MO-137, QSOP-28 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 586K |
| 代理商： | MAX1939EEI |
M
Two-Phase Desktop CPU Core Supply Controllers
with Controlled VID Change
______________________________________________________________________________________
21
where f
SW
is approximately 250kHz, Q
GH
is the gate
charge of the high-side MOSFET, and Q
GL
is the gate
charge of the low-side MOSFET. The values used for
the gate charge are at the gate drive voltage (V
VLG
).
The
“
2
”
in the above equation is due to the two phases
of the converter. If multiple MOSFETs are used in paral-
lel, add the gate charges of each MOSFET to find the
total gate charge used in the above equation.
Make sure that the maximum power dissipation of the IC
is not exceeded (see the
Absolute Maximum Ratings
).
Applications Information
PC Board Layout Guidelines
A properly designed PC board layout is important in any
switching DC-DC converter circuit. If possible, mount
the MOSFETs, inductor, input/output capacitors, and
current-sense resistor on the top side of the PC board.
Connect the ground for these devices close together on
a power ground plane. Make all other ground connec-
tions to a separate analog ground plane. Connect the
analog ground plane to power ground at a single point.
To help dissipate heat, place high-power components
(MOSFETs, inductor, and current-sense resistor) on a
large PC board area, or use a heat sink. Keep high cur-
rent traces short and wide to reduce the resistance in
these traces. Also make the gate-drive connections (DH_
and DL_) short and wide, measuring 10 to 20 squares
(50mils to 100mils wide if the MOSFET is 1in from the
controller IC).
Use Kelvin sense connections for the current-sense
resistors.
Place the REF capacitor, the V
DD
capacitor, and the
BST_ diode and capacitor as close as possible to the IC.
If the IC is far from the input capacitors, bypass V
CC
to
GND with an additional 0.1μF or greater ceramic capaci-
tor close to the V
CC
pin.
For an example PC board layout, refer to the MAX1937
or MAX1938 evaluation kit.
Chip Information
TRANSISTOR COUNT: 6243
PROCESS: BiCMOS
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