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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)： | 36/49頁 |
| 文件大?。?/td> | 983K |
| 代理商： | MAX1994ETM |
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M
Dual Step-Down Controllers Plus Linear-
Regulator Controller for Notebook Computers
36
______________________________________________________________________________________
Output Overvoltage Protection
Output overvoltage protection (OVP) is available on
BUCK1, BUCK2, and the linear regulator. The LINFB
input is always monitored for overvoltage. The FBS and
OUT2 inputs are only monitored for overvoltages when
OVP is enabled. When any output exceeds the desired
OVP threshold, the fault latch is set and the regulator is
turned off. In the fault mode, DL1 and DL2 are forced
high, DH1 and DH2 are forced low, and the linear regu-
lator is turned off. For BUCK1 and BUCK2, if the condi-
tion that caused the overvoltage (such as a shorted
high-side MOSFET) persists, the battery fuse will blow.
DL1 is also kept high continuously when V
CC
UVLO is
active, as well as in shutdown mode (Table 4). The
device remains in the fault mode until V
CC
is cycled, or
either SKP_/
SDN
or LIN/
SDN
is toggled. The triggering
of the reset condition occurs on the rising edge of the
SKP_/
SDN
or LIN/
SDN
signals.
For BUCK1, the default OVP threshold is 2V for the
MAX1816 and 2.25V for the MAX1994. For BUCK2, the
OVP threshold is 115% of the nominal voltage for OUT2
(FB2 if external feedback is used for BUCK2). The over-
voltage detection level for FBS can be adjusted through
an external resistive voltage-divider. Connecting OVPSET
to a voltage between 1.0V and 2.0V sets the OVP thresh-
old for FBS. For the MAX1816, the fault latch is set when
V
FBS
> V
OVPSET
. For the MAX1994, the fault latch is set
when V
FBS
> 1.125
V
OVPSET
. The OVP threshold on
OUT2 is not adjustable and remains at the default value
of 115%. Connecting OVPSET to V
CC
disables OVP for
BUCK1 and BUCK2. The operation of the linear regulator
is not affected by OVPSET. Overvoltage protection can
be disabled using the NO FAULT test mode (see the
NO
FAULT Test Mode
section).
Output Undervoltage Protection
The output undervoltage protection (UVP) is available on
BUCK1, BUCK2, and the linear regulator. The protection
is similar to foldback current limiting, but employs a timer
rather than a variable current limit. If the output voltage is
under 70% of the nominal value for BUCK1 and BUCK2,
and under 90% for the linear regulator (see the
Electrical
Characteristics
table for the respective UVP thresholds),
the fault latch is set. In the fault mode, DL1 and DL2 are
forced high, DH1 and DH2 are forced low, and the linear
regulator is turned off. The controller does not restart until
V
CC
power is cycled, or either SKP_/
SDN
or LIN/
SDN
is
toggled. The triggering of the reset condition occurs on
the rising edge of the SKP_/
SDN
or LIN/
SDN
signals.
Table 7. Offset Selection Truth Table
INPUTS
PERF
0
0
1
1
0
0
1
1
ACTIVE OFS INPUTS
OFS1
0
1
0
0
0
0
0
0
MODE
SUS
0
0
0
0
1
1
1
1
DPSLP
0
1
0
1
0
1
0
1
OFS2
1
0
0
0
0
0
0
0
OFS0
0
0
1
0
0
0
0
0
Battery Sleep
Battery
Performance Sleep
Performance
Suspend
Suspend
Suspend
Suspend
0 = Logic low or input not selected.
1 = Logic high or input selected.
DL2
AGND
OUT2
CS2
DH2
FB2
V
BATT
V
OUT
R1
R2
MAX1816
MAX1994
PGND
Figure 11. Adjusting BUCK2 Output Voltage with a Resistive
Voltage-Divider
相關PDF資料 |
PDF描述 |
|---|---|
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| MAX1816ETM | Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP |
| MAX199AEWI | Fixed-Point Digital Signal Processor 532-FCBGA |
| MAX199AMYI | Circular Connector; No. of Contacts:18; Series:MS27505; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle RoHS Compliant: No |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1994ETM+ | 功能描述:DC/DC 開關控制器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 開關控制器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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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