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參數(shù)資料
| 型號： | MAX1714BEEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Speed Step-Down Controller for Notebook Computers |
| 中文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, MO-137AA, QSOP-16 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 443K |
| 代理商： | MAX1714BEEE |
where a single milliohm of excess trace resistance
causes a measurable efficiency penalty.
LX and PGND connections to Q2 for current limiting
must be made using Kelvin sense connections to
guarantee the current-limit accuracy. With SO-8
MOSFETs, this is best done by routing power to the
MOSFETs from outside using the top copper layer,
while tying in PGND and LX
inside
(underneath) the
SO-8 package.
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 output filter capacitor (see
the
All-Ceramic-Capacitor Application
section).
Route high-speed switching nodes (BST, LX, DH, and
DL) away from sensitive analog areas (REF, FB).
Make all pin-strap control input connections (
SKIP
,
ILIM, etc.) to AGND or V
CC
rather than PGND or V
DD
.
Layout Procedure
1) Place the power components first, with ground termi-
nals adjacent (Q2 source, CIN-, COUT-, D1 anode). If
possible, make all these connections on the top layer
with wide, copper-filled areas.
2) Mount the controller IC adjacent to MOSFET Q2,
preferably on the back side opposite Q2 in order to
keep LX, PGND, and the DL gate-drive lines short and
wide. The DL gate trace must be short and wide,
measuring 10 to 20 squares (50 to 100 mils wide if the
MOSFET is 1 inch from the controller IC).
3) Group the gate-drive components (BST diode and
capacitor, V
DD
bypass capacitor) together near the
controller IC.
4) Make the DC-DC controller ground connections as
shown in Figure 11. This diagram can be viewed as
having three separate ground planes: output ground,
where all the high-power components go; the PGND
plane, where the PGND pin and V
DD
bypass capaci-
tor go; and an analog AGND plane, where sensitive
analog components go. The analog ground plane and
PGND plane must meet only at a single point directly
beneath the IC. For the MAX1714B, this point should
be the GND pin. These two planes are then connect-
ed to the high-power output ground with a short con-
nection from V
DD
cap/PGND to the source of the
low-side MOSFET, Q2 (the middle of the star ground).
This point must also be very close to the output
capacitor ground terminal.
5) Connect the output power planes (V
CORE
and system
ground planes) directly to the output filter capacitor
positive and negative terminals with multiple vias.
Place the entire DC-DC converter circuit as close to
the CPU as is practical.
M
High-Speed Step-Down Controller
for Notebook Computers
______________________________________________________________________________________
21
DL
AGND
(GND)
OUT
PGND
(GND)
( ) ARE FOR THE MAX1714B ONLY.
DH
FB
V
BATT
V
OUT
R1
R2
MAX1714
Figure 9. Setting V
OUT
with a Resistor-Divider
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PDF描述 |
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| MAX1715 | Ultra-High Efficiency, Dual Step-Down Controller for Notebook Computers |
| MAX1715EEI | Ultra-High Efficiency, Dual Step-Down Controller for Notebook Computers |
| MAX1717 | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP |
| MAX1717EEG | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP |
| MAX1718EEI | Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1714BEEE+ | 功能描述:電流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1714BEEE+T | 功能描述:電流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1714BEEE-T | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1714BEEE-TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1714BEVKIT | 功能描述:電流型 PWM 控制器 Evaluation Kit for the MAX1714B RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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