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參數(shù)資料
| 型號(hào)： | MAX863EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual, High-Efficiency, PFM, Step-Up DC-DC Controller |
| 中文描述： | DUAL SWITCHING CONTROLLER, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 194K |
| 代理商： | MAX863EEE |
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M
Dual, High-Effic ienc y, PFM, S tep-Up
DC-DC Controller
14
______________________________________________________________________________________
S et Feedbac k Compensation
External voltage feedback to the MAX863 should be
compensated for stray capacitance and EMI in the
feedback network. Proper compensation is achieved
when the MAX863 switches evenly, rather than in wide-
ly spaced bursts of pulses with large output ripple.
Typically, lead compensation consisting of a 10pF to
220pF ceramic capacitor (C1 in Figure 7) across the
upper feedback resistor is adequate. Circuits with
V
OUT
or V
DD
greater than 7.5V may require a second
capacitor across the lower feedback resistor. Initially,
choose this capacitor so that R2C2 = R1C1. Set the
final values of the compensation capacitors based on
empirical analysis of a prototype.
PC Board Layout and Routing
High switching speeds and large peak currents make
PC board layout an important part of design. Poor lay-
out can cause excessive EMI and ground-bounce, both
of which can cause instability or regulation errors by
corrupting the voltage and current-feedback signals.
Place power components as close together as possi-
ble, and keep their traces short, direct, and wide. Keep
the extra copper on the board and integrate it into
ground as an additional plane. On multi-layer boards,
avoid interconnecting the ground pins of the power
components using vias through an internal ground
plane. Instead, place the ground pins of the power
components close together and route them in a “star”
ground configuration using component-side copper,
then connect the star ground to the internal ground
plane using multiple vias.
The current-sense resistor and voltage-feedback net-
works should be very close to the MAX863. Noisy
traces, such as from the EXT pins, should be kept away
from the voltage-feedback networks and isolated from
them using grounded copper. Consult the MAX863
evaluation kit manual for a full PC board example.
MAX863
EXT2
CS2
V
OUT2
= 24V, 35mA
V
OUT1
= 5V
V
IN
= 1.8V TO V
OUT1
N1B
IRF7103
C7
0.1
μ
F
R4
49.9k
1%
C6
15pF
C5
22
μ
F
35V
0.1
R2
100m
R3
909k
1%
N1A
R1
50m
R7
100k
C1
220
μ
F
10V
≤
0.1
R5
R6
D1
MBRS340T3
D2
MBRS140
L1
10
μ
H
2A
L2
10
μ
H
1A
C3
100
μ
F
10V
≤
0.1
C4
100
μ
F
10V
≤
0.1
C2
0.1
μ
F
ON/OFF
FB2
SHDN1
EXT1
CS1
LBO
LOW-BATTERY
DETECTOR OUTPUT
LBI
SENSE1
V
DD
BOOT
GND
SHDN2
REF
PGND
FB1
C8
270pF
Figure 8. Bootstrapped 3.3V Logic and 24V LCD Bias Supply
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX863EEE+ | 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual PFM Step-Up DC/DC Controller 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 |
| MAX863EEE+T | 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual PFM Step-Up DC/DC Controller 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 |
| MAX863EEE-T | 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual PFM Step-Up DC/DC Controller 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 |
| MAX863EVKIT | 功能描述:DC/DC 開(kāi)關(guān)控制器 Evaluation Kit for the MAX863 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 |
| MAX8640EVKIT | 制造商:Maxim Integrated Products 功能描述:500MA 4MHZ/2MHZ SYNCHRONOUS STEP-D - Rail/Tube |
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