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參數(shù)資料
| 型號： | MAX1761 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Small, Dual, High-Efficiency Buck Controller for Notebooks |
| 中文描述： | 小型、雙路、高效率buck控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 21/23頁 |
| 文件大?。?/td> | 473K |
| 代理商： | MAX1761 |
M
Small, Dual, High-Efficiency
Buck Controller for Notebooks
______________________________________________________________________________________
21
When trade-offs in trace lengths must be made, it
’
s
preferable to allow the inductor charging path to be
made longer than the discharge path. For example,
it
’
s better to allow some extra distance between the
input capacitors and the high-side MOSFET than to
allow distance between the inductor and the low-
side MOSFET or between the inductor and the out-
put filter capacitor.
Ensure that the OUT connection to C
OUT
is short
and direct. However, in some cases it may be
desirable to deliberately introduce some trace
length between the OUT inductor node and the out-
put filter capacitor (see
Stability Considerations
).
Route high-speed switching nodes (CS_, DH_, and
DL_) away from sensitive analog areas (REF, FB_).
Use a PGND as an EMI shield to keep radiated
switching noise away from the IC, feedback
dividers, and analog bypass capacitors.
Avoid coupling switching noise into control input
connections (ON1, ON2, etc.). These pins should
be referenced to a quiet analog ground plane.
Layout Procedure
1) Place the power components first, with ground ter-
minals adjacent (Q2 source, CI
N_
, C
OUT_
). If possi-
ble, make all these connections on the top layer
with wide, copper-filled areas.
2) Mount the controller IC adjacent to the synchronous
rectifier MOSFETs, preferably on the back side in
order to keep CS_, PGND_, and the DL_ gate-drive
line short and wide. The DL_ gate trace must be
short and wide, measuring 10 to 20 squares (50mils
to 100mils wide if the MOSFET is 1 inch from the
controller IC).
3) Place the VL capacitor near the IC controller.
4) Make the DC-DC controller ground connections as
follows: near the IC, create a small analog ground
plane. Use this plane for the ground connection for
the REF and VL bypass capacitor, and FB_
dividers. Create another small ground island for
PGND, and use it for the V+ bypass capacitor,
placed very close to the IC. Connect the AGND and
the PGND together under the IC (this is the only
connection between AGND and PGND).
5) On the board
’
s top side (power planes), make a
star ground to minimize crosstalk between the two
sides. The top-side star ground is a star connection
of the input capacitors, side 1 low-side MOSFET,
and side 2 low-side MOSFET. Keep the resistance
low between the star ground and the sources of the
low-side MOSFETs for accurate current limit.
Connect the top-side star ground (used for MOS-
FET, input, and output capacitors) to the small
PGND island with a short, wide connection (prefer-
ably just a via). If multiple layers are available (high-
ly recommended), create PGND1 and PGND2
islands on the layer just below the top-side layer
(refer to the MAX1761 EV kit for an example) to act
as an EMI shield. Connect each of these individual-
ly to the star ground via, which connects the top
side to the PGND plane. Add one more solid
ground plane under the IC to act as an additional
shield, and also connect that to the star ground via.
6) Connect the output power planes directly to the out-
put filter capacitor positive and negative terminals
with multiple vias.
DL
CS
OUT
GND
DH
1/2
FB
V+
V
OUT
R1
R2
MAX1761
Figure 12. Setting V
OUT
with a Resistive Voltage-Divider
MAX1761
TO ERROR
AMP1
TO ERROR
AMP2
OUT2
FB2
0.1V
0.1V
FB1
FIXED
1.8V
FIXED
2.5V
OUT1
Figure 11. Feedback MUX
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| MAX1761EEE | Replaced by TMS320VC5506 : Digital Signal Processor 100-LQFP |
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| MAX1765 | Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX17611GTL+ | 制造商:Maxim Integrated Products 功能描述:IMVP7 CPU AND GRAPHICS CONTROLLER - Rail/Tube |
| MAX17611GTL+T | 制造商:Maxim Integrated Products 功能描述:IMVP7 CPU AND GRAPHICS CONTROLLER - Tape and Reel |
| MAX1761EEE | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1761EEE+ | 功能描述:DC/DC 開關(guān)控制器 Dual Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1761EEE+T | 功能描述:DC/DC 開關(guān)控制器 Dual Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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