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參數(shù)資料
| 型號(hào)： | MAX1876AEEG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Fixed-Point Digital Signal Processor 288-BGA MICROSTAR |
| 中文描述： | DUAL SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, 0.25 INCH PITCH, MO-137AE, QSOP-24 |
| 文件頁(yè)數(shù)： | 19/21頁(yè) |
| 文件大?。?/td> | 493K |
| 代理商： | MAX1876AEEG |
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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.
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
M
Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
______________________________________________________________________________________
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MAX1876AEEG+ | 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)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 |
| MAX1876AEEG+T | 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)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 |
| MAX1876AEEG-T | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX1876EEG | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX1876EEG+ | 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)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 |
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