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參數(shù)資料
| 型號(hào)： | MAX1540A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator |
| 中文描述： | 雙路、降壓型控制器，帶有電感飽和保護(hù)、動(dòng)態(tài)輸出和線性穩(wěn)壓器 |
| 文件頁數(shù)： | 42/49頁 |
| 文件大?。?/td> | 794K |
| 代理商： | MAX1540A |
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M
Voltage Positioning
In applications where fast load transients occur, the out-
put voltage changes instantly by ESR
COUT
x
Δ
I
LOAD
.
Voltage positioning allows the use of fewer output
capacitors for such applications, and maximizes the out-
put voltage AC and DC tolerance window in tight-toler-
ance applications.
Figure 17 shows the connection of OUT_ and FB_ in
voltage-positioned and nonvoltage-positioned circuits.
In nonvoltage-positioned circuits, the MAX1540A/
MAX1541 regulate at the output capacitor. In voltage-
positioned circuits, the MAX1540A/MAX1541 regulate
on the inductor side of the current-sense resistor.
V
OUT_
is reduced to:
V
OUT(VPS)
= V
OUT(NO LOAD)
- R
SENSE
x I
LOAD
Figure 18 shows the voltage-positioning transient
response.
PC Board Layout Guidelines
Careful PC board layout is critical to achieving low
switching losses and clean, stable operation. The
switching power stage requires particular attention
(Figure 19). If possible, mount all the power compo-
nents on the top side of the board, with their ground ter-
minals flush against one another. Follow these
guidelines for good PC board layout:
Keep the high-current paths short, especially at the
ground terminals. This practice is essential for sta-
ble, jitter-free operation.
Keep the power traces and load connections short.
This practice is essential for high efficiency. Using
thick copper PC boards (2oz vs. 1oz) can enhance
full-load efficiency by 1% or more. Correctly routing
PC board traces is a difficult task that must be
approached in terms of fractions of centimeters,
where a single milliohm of excess trace resistance
causes a measurable efficiency penalty.
Minimize current-sensing errors by connecting
CSP_ and CSN_ directly across the current-sense
resistor (R
SENSE_
).
When trade-offs in trace lengths must be made, it is
preferable to allow the inductor charging path to be
made longer than the discharge path. For example,
it is 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.
Route high-speed switching nodes (BST_, LX_,
DH_, and DL_) away from sensitive analog areas
(REF, FB_, CSP_, CSN_).
Layout Procedure
1) Place the power components first, with ground ter-
minals adjacent (N
L _
source, C
IN
, C
OUT
_, and D
L
_
anode). If possible, make all these connections on
the top layer with wide, copper-filled areas.
2) Mount the controller IC adjacent to the low-side
MOSFET, preferably on the back side opposite N
L
_
and N
H
_ in order to keep LX_, GND, DH_, and the
DL_ gate-drive lines short and wide. The DL_ and
DH_ gate traces must be short and wide (50 mils to
100 mils wide if the MOSFET is 1in from the con-
troller IC) to keep the driver impedance low and for
proper adaptive dead-time sensing.
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
42
______________________________________________________________________________________
Figure 16. Active Bus Termination
MAX1541
C
OUT
V
IN
L
C
IN
OD
SKIP
REFIN1
GATE
10k
Ω
10k
Ω
FBLANK
V
DDQ
= DDR MEMORY SUPPLY VOLTAGE
V
TT
= TERMINATION SUPPLY VOLTAGE
GND
DL1
10nF
DH1
LX1
CSN1
CSP1
R
SENSE
FB1
OUT1
V
DDQ
V
CC
V
TT
=V
DDQ
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1540AETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot 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 |
| MAX1540AETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot 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 |
| MAX1540ETJ | 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 |
| MAX1540ETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr 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 |
| MAX1540ETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr 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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