參數(shù)資料
型號： MAX1994ETM
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Dual Step-Down Controllers Plus Linear- Regulator Controller for Notebook Computers
中文描述： DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CQCC48
封裝： 7 X 7 MM, 0.80 MM HEIGHT, THIN, QFN-48
文件頁數(shù)： 34/49頁
文件大?。?/td> 983K
代理商： MAX1994ETM
M
Dual Step-Down Controllers Plus Linear-
Regulator Controller for Notebook Computers
34
______________________________________________________________________________________
equal to 1/8th the voltage appearing at the selected
OFS input (
V
OUT
= -0.125
×
V
OFS_
). For inputs from
1.2V to 2V, a positive offset is added to the output that
is equal to 1/8th the difference between the reference
voltage and the voltage appearing at the selected OFS
input (
V
OUT
= 0.125
×
(V
REF
- V
OFS_
)). With this
scheme, both positive and negative offsets can be
achieved with a single voltage-divider. The piecewise
linear transfer function is shown in Figure 9.
The regions of the transfer function below zero, above
2.0V, and between 0.8V and 1.2V are undefined. OFS
inputs are disallowed in these regions, and the respec-
tive effects on the output are not specified.
The offset control inputs are selected using a combina-
tion of the three logic inputs (SUS, PERF, and
DPSLP
),
which also define the operating mode for the
MAX1816/MAX1994. Table 7 details which OFS input is
selected based on these control inputs.
BUCK1 Output-Voltage Transition Timing
The MAX1816/MAX1994 are designed to perform out-
put voltage transitions in a controlled manner, automati-
cally minimizing input surge currents. This feature
allows the regulator to perform nearly ideal transitions,
guaranteeing just-in-time arrival at the new output volt-
age level with the lowest possible peak currents for a
given output capacitance.
Modern mobile CPUs operate at multiple clock frequen-
cies that require multiple VID settings. It is common
when transitioning from one clock frequency to another
for the CPU to go into a low-power state before chang-
ing the output voltage and clock frequency. The change
must be accomplished within a fixed time interval
—
often
less than 100μs.
Table 6. Output Voltage vs. Suspend
Mode DAC Codes
S1
S0
V
OUT
(V)
MAX1816/MAX1994
GND
GND
GND
GND
REF
REF
REF
REF
OPEN
OPEN
OPEN
OPEN
V
CC
V
CC
V
CC
V
CC
GND
REF
OPEN
V
CC
GND
REF
OPEN
V
CC
GND
REF
OPEN
V
CC
GND
REF
OPEN
V
CC
1.075
1.050
1.025
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
Table 5. Output Voltage vs. DAC Codes
D4
D3
D2
D1
D0
V
OUT
(V)
MAX1816
V
OUT
(V)
MAX1994
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1.750
1.700
1.650
1.600
1.550
1.500
1.450
1.400
1.350
1.300
1.250
1.200
1.150
1.100
1.050
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
0.675
0.650
0.625
0.600
2.000
1.950
1.900
1.850
1.800
1.750
1.700
1.650
1.600
1.550
1.500
1.450
1.400
1.350
1.300
No CPU
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
1.025
1.000
0.975
0.950
0.925
No CPU
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1994ETM+ 功能描述:DC/DC 開關(guān)控制器 Integrated Circuits (ICs) 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 安裝風格: 封裝 / 箱體:CPAK
MAX1994ETM+T 功能描述:DC/DC 開關(guān)控制器 Integrated Circuits (ICs) 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 安裝風格: 封裝 / 箱體:CPAK
MAX1994ETM-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 安裝風格: 封裝 / 箱體:CPAK
MAX1994EVKIT 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX1816 MAX1980 MAX1994 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 安裝風格: 封裝 / 箱體:CPAK
MAX1995EGI 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
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