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參數(shù)資料
| 型號： | MAX1858 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual 180∑ Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| 中文描述： | 雙路、180°異相、PWM降壓型控制器，帶有電源順序控制及POR |
| 文件頁數(shù)： | 21/22頁 |
| 文件大?。?/td> | 553K |
| 代理商： | MAX1858 |
M
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
______________________________________________________________________________________
21
Use a star-ground connection on the power plane to
minimize the crosstalk between OUT1 and OUT2.
Keep the high-current paths short, especially at the
ground terminals. This practice is essential for sta-
ble, jitter-free operation.
Connect GND and PGND together close to the IC.
Do not connect them together anywhere else.
Carefully follow the grounding instructions under
step 4 of the
Layout Procedure
section.
Keep the power traces and load connections short.
This practice is essential for high efficiency. Use
thick copper PC boards (2oz vs. 1oz) to enhance
full-load efficiency by 1% or more.
LX_ and PGND connections to the synchronous rec-
tifiers for current limiting must be made using Kelvin-
sense connections to guarantee the current-limit
accuracy. With 8-pin SO MOSFETs, this is best done
by routing power to the MOSFETs from outside
using the top copper layer, while connecting PGND
and LX_ underneath the 8-pin SO package.
When trade-offs in trace lengths must be made,
allow the inductor-charging path to be made longer
than the discharge path. Since the average input
current is lower than the average output current in
step-down converters, this minimizes the power dis-
sipation and voltage drops caused by board resis-
tance. For example, allow some extra distance
between the input capacitors and the high-side
MOSFET rather than to allow distance between the
inductor and the low-side MOSFET or between the
inductor and the output filter capacitor.
Ensure that the feedback connection to C
OUT_
is
short and direct.
Route high-speed switching nodes (BST_, LX_, DH_,
and DL_) away from the sensitive analog areas
(REF, COMP_, ILIM_, and FB_). Use PGND1 and
PGND2 as EMI shields to keep radiated noise away
from the IC, feedback dividers, and analog bypass
capacitors.
Make all pin-strap control input connections (ILIM_,
SYNC, and EN) to analog ground (GND) rather than
power ground (PGND).
Layout Procedure
1) Place the power components first, with ground termi-
nals adjacent (N
L
_ source, C
IN
_, and C
OUT
_). Make
all these connections on the top layer with wide, cop-
per-filled areas (2oz copper recommended).
2) Mount the controller IC adjacent to the synchronous-
rectifier MOSFETs (N
L
_), preferably on the back
side in order to keep LX_, PGND_, and DL_ traces
short and wide. The DL_ gate trace must be short
and wide, measuring 50mils to 100mils wide if the
low-side MOSFET is 1in from the controller IC.
3) Group the gate-drive components (BST_ diodes and
capacitors, and V
L
bypass capacitor) together near
the controller IC.
4) Make the DC-DC controller ground connections as
follows: create a small analog ground plane near the
IC. Connect this plane to GND and use this plane for
the ground connection for the reference (REF) V+
bypass capacitor, compensation components, feed-
back dividers, OSC resistor, and ILIM_ resistors (if
any). Connect GND and PGND together under the
IC (this is the only connection between GND and
PGND).
5) On the board
’
s top side (power planes), make a star
ground to minimize crosstalk between the two sides.
Chip Information
TRANSISTOR COUNT: 6688
PROCESS: BiCMOS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1858AEEG | 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 安裝風格: 封裝 / 箱體:CPAK |
| MAX1858AEEG+ | 功能描述:電壓模式 PWM 控制器 Dual 180 Out Buck Controllers RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1858AEEG+T | 功能描述:電壓模式 PWM 控制器 Dual 180 Out Buck Controllers RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1858AEEG-T | 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 安裝風格: 封裝 / 箱體:CPAK |
| MAX1858EEG | 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 安裝風格: 封裝 / 箱體:CPAK |
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