參數(shù)資料
型號： MAX1813
廠商： Maxim Integrated Products, Inc.
元件分類： 數(shù)字信號處理
英文描述： Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP
中文描述： 動態(tài)可調(diào)、同步降壓型控制器，集成電壓定位電路
文件頁數(shù)： 20/38頁
文件大?。?/td> 738K
代理商： MAX1813
M
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
20
______________________________________________________________________________________
efficiency, EMI, and shoot-through currents. This is
often remedied by adding a resistor less than 5
in
series with BST, which increases the turn-on time of the
high-side FET without degrading the turn-off time
(Figure 5).
DAC Converter (D0-D4)
The digital-to-analog converter (DAC) programs the
output voltage. It receives a preset digital code from
the CPU pins, digital logic, general-purpose I/O, or an
external multiplexer. Do not leave D0
–
D4 floating; use
1M
or less pullups if the inputs may float.
The state of DO
–
D4 can be changed while the switch-
mode power supply is active, initiating a transition to a
new output voltage level. During this interval, the slew-
rate controller is active, so the MAX1813 uses forced-
PWM mode. If this mode of DAC control is used,
connect ZMODE low. Change D0
–
D4 together, avoid-
ing greater than 1μs skew between bits. Otherwise,
incorrect DAC readings may cause a partial transition
to the wrong voltage level, lengthening the overall tran-
sition time. The available DAC codes and resulting out-
put voltages (Table 5) are compatible with the
Coppermine
and Intel
’
s Mobile Voltage Positioning II
(IMVP-II
) specifications.
VID Code Options (CODE)
The MAX1813 contains two separate sets of VID codes.
The CODE pin selects between the two output voltage
tables (Table 5). Drive CODE low to select the older
0.925V to 2.000V DAC codes, which are compatible
with the Coppermine specifications. Drive CODE high
to select the new 0.600V to 1.750V DAC codes, which
are compatible with the IMVP-II specifications. CODE
also determines the polarity of ZMODE (Table 7).
Suspend-Mode Operation (S0, S1)
When the CPU clock stops, the processor enters sus-
pend mode and requires a lower supply voltage to min-
imize power consumption. The MAX1813 includes
suspend-mode output voltages that are selected using
two 4-level input pins (S0 and S1, Table 6). When the
CPU clock stops, drive SUS high to transition to the
suspend-mode output voltage. During the transition,
the MAX1813 asserts forced-PWM mode to sink current
and pull down the output voltage until PGOOD goes
high.
When SUS is driven high, suspend mode overrides the
5-bit DAC setting. When SUS is low, the MAX1813
determines the output voltage from the 5-bit DAC
(D0
–
D4), CODE, and ZMODE settings.
Internal Multiplexers (ZMODE, SUS)
The MAX1813 has a unique internal multiplexer that
can select one of three different VID code settings for
different processor states. Depending on the logic level
at SUS, the suspend (SUS) mode multiplexer selects
the VID code settings from either the D0-D4 input
decoder or the S0/S1 input decoder. The ZMODE multi-
plexer selects one of the two D0-D4 input modes, set-
ting the VID code based on either the voltage on D0-D4
(logic mode) or the impedance decoder output (imped-
ance mode) (Figure 6).
When SUS is high, the suspend-mode multiplexer
selects the VID code from the S0/S1 input decoder. The
decoder outputs are determined by inputs S0 and S1
(Table 6). When SUS is low, the suspend-mode multi-
plexer selects the D0-D4 input decoder output.
In logic mode (Table 7), the logic-level voltages on D0-
D4 set the DAC settings. In this mode, the inputs are
continuously active and can be dynamically changed
by external logic. The logic-mode VID code setting is
typically used for the battery-mode state, and the
source of this code is sometimes the VID pins of the
CPU with suitable pullup resistors.
Impedance mode (Table 7) is programmed by external
resistors in series with D0
–
D4, using a unique scheme
that allows two sets of data bits using only one set of
pins. When the MAX1813 initially enters impedance
mode, the resistances at D0
–
D4 are sampled by the
impedance decoder to see if there is a large resistance
in series with the pin. If the voltage level on a DAC input
pin is a logic low, an internal switch connects that pin to
BST
+5V
V
BATT
5
TYP
DH
LX
MAX1813
Figure 5. Reducing the Switching-Node Rise Time
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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
MAX1813EEI+ 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
MAX1813EEI+T 功能描述:DC/DC 開關(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
MAX1813EVKIT 功能描述:DC/DC 開關(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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