參數(shù)資料
型號(hào)： MAX1813
廠商： Maxim Integrated Products, Inc.
元件分類(lèi)： 數(shù)字信號(hào)處理
英文描述： Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP
中文描述： 動(dòng)態(tài)可調(diào)、同步降壓型控制器，集成電壓定位電路
文件頁(yè)數(shù)： 35/38頁(yè)
文件大?。?/td> 738K
代理商： MAX1813
M
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
______________________________________________________________________________________
35
to V+ on the MAX1813, with the same attenuation factor
as the output divider. The V+ input has a nominal
600k
input impedance, which should be considered
when selecting resistor values.
One-Stage (Battery Input) vs. Two-Stage
(5V Input) Applications
The MAX1813 can be used with a direct battery con-
nection (one stage) or can obtain power from a regulat-
ed 5V supply (two stage). Each approach has
advantages, and careful consideration should go into
the selection of the final design.
The one-stage approach offers smaller total inductor
size and fewer capacitors overall due to the reduced
demands on the 5V supply. The transient response of
the single stage is better due to the ability to ramp the
inductor current faster. The total efficiency of a single
stage is better than the two-stage approach.
The two-stage approach allows flexible placement due
to smaller circuit size and reduced local power dissipa-
tion. The power supply can be placed closer to the
CPU for better regulation and lower I
2
R losses from PC
board traces. Although the two-stage design has slow-
er transient response than the single stage, this can be
offset by the use of a voltage-positioned converter.
Ceramic Output Capacitor Applications
Ceramic capacitors have advantages and disadvan-
tages. They have ultra-low ESR and are noncom-
bustible, relatively small, and nonpolarized. However,
they are also expensive and brittle, and their ultra-low
ESR characteristic can result in excessively high ESR
zero frequencies. In addition, their relatively low capac-
itance value can cause output overshoot when step-
ping from full-load to no-load conditions, unless a small
inductor value is used (high switching frequency) or
there are some bulk tantalum or electrolytic capacitors
in parallel to absorb the stored inductor energy. In
some cases, there may be no room for electrolytics,
creating a need for a DC-DC design that uses nothing
but ceramics.
The MAX1813 can take advantage of the small size and
low ESR of ceramic output capacitors. To ensure stable
operation, there must be sufficient resistance in series
with the inductor and output capacitor (see
“
Output
Capacitor Stablility Considerations
”
).
Output overshoot (V
SOAR
) determines the minimum
output capacitance requirement (see Output Capacitor
Selection). Often the switching frequency is increased
to 1000kHz or 600kHz, and the inductor value is
reduced to minimize the energy transferred from induc-
tor to capacitor during load-step recovery. The efficien-
cy penalty for operating at 1000kHz is about 5% and
MAX1813
DH
LX
VPCS
PGND
GND
DL
REF
FB
V
OUT
C
OUT
Q
2
C
FB
C
VPCS
R
VPCS
Q
1
R
FB
R5
R6
R7
LOGIC
ADD0
ADD1
INH
CONTROL
LOGIC
R8
L1
R
SENSE
C
REF
V
CC
MAX4634
MAX4322
Figure 18. Adding a Negative Offset Voltage
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1813EEI 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
MAX1813EEI+ 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
MAX1813EEI+T 功能描述:DC/DC 開(kāi)關(guān)控制器 Dynamically Adjustable Synchronous Step-Down Controller w/Integrated Voltage Positioning 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
MAX1813EEI-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
MAX1813EVKIT 功能描述:DC/DC 開(kāi)關(guān)控制器 Evaluation Kit for the MAX1813 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
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