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參數(shù)資料
| 型號(hào)： | MAX1537A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers |
| 中文描述： | 高效率、5路輸出、主電源控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 20/38頁 |
| 文件大?。?/td> | 1427K |
| 代理商： | MAX1537A |
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M
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
20
______________________________________________________________________________________
SMPS Enable Controls (ON3, ON5)
ON3 and ON5 control SMPS power-up sequencing.
ON3 or ON5 rising above 2.4V enables the respective
outputs. ON3 or ON5 falling below 1.6V disables the
respective outputs. Driving ON_ below 0.8V clears the
overvoltage, undervoltage, and thermal fault latches.
SMPS Power-Up Sequencing
Connecting ON3 or ON5 to REF forces the respective
outputs off while the other output is below regulation
and starts after that output regulates. The second SMPS
remains on until the first SMPS turns off, the device
shuts down, a fault occurs, or LDO5 goes into undervolt-
age lockout. Both supplies begin their power-down
sequence immediately when the first supply turns off.
Output Discharge (Soft-Shutdown)
When output discharge is enabled (
OVP
pulled low)
and the switching regulators are disabled—by transi-
tions into standby or shutdown mode, or when an
output undervoltage fault occurs—the controller dis-
charges both outputs through internal 12
Ω
switches,
until the output voltages decrease to 0.3V. This slowly
discharges the output capacitance, providing a soft-
damped shutdown response. This eliminates the slight-
ly negative output voltages caused by quickly
discharging the output through the inductor and low-
side MOSFET. When an SMPS output discharges to
0.3V, its low-side driver (DL_) is forced high, clamping
the respective SMPS output to GND. The reference
remains active to provide an accurate threshold and to
provide overvoltage protection. Both SMPS controllers
contain separate soft-shutdown circuits.
When output discharge is disabled (
OVP
= V
CC
), the low-
side drivers (DL_) and high-side drivers (DH_) are both
pulled low, forcing LX into a high-impedance state. Since
the outputs are not actively discharged by the SMPS con-
trollers, the output-voltage discharge rate is determined
only by the output capacitance and load current.
Fixed-Frequency, Current-Mode
PWM Controller
The heart of each current-mode PWM controller is a multi-
input, open-loop comparator that sums two signals: the
output-voltage error signal with respect to the reference
voltage and the slope-compensation ramp (Figure 3).
The MAX1533A/MAX1537A use a direct-summing con-
figuration, approaching ideal cycle-to-cycle control over
the output voltage without a traditional error amplifier and
the phase shift associated with it. The MAX1533A/
MAX1537A use a relatively low loop gain, allowing the
use of low-cost output capacitors. The low loop gain
results in the -0.1% typical load-regulation error and
helps reduce the output capacitor size and cost by
shifting the unity-gain crossover frequency to a lower
level.
Table 3. Operating Modes
INPUTS*
ON5
X
LOW
HIGH
LOW
HIGH
OUTPUTS
5V SMPS
MODE
SHDN
LOW
HIGH
HIGH
HIGH
HIGH
ON3
X
LOW
HIGH
HIGH
LOW
LDO5
OFF
ON
ON
ON
ON
LDO3
OFF
ON
ON
ON
ON
3V SMPS
OFF
OFF
ON
ON
OFF
Shutdown Mode
Standby Mode
Normal Operation
3.3V SMPS Active
5V SMPS Active
OFF
OFF
ON
OFF
ON
Normal Operation
(Delayed 5V SMPS
Startup)
HIGH
REF
HIGH
ON
ON
ON
Power-up after
3.3V SMPS is in
regulation
ON
Normal Operation
(Delayed 3.3V
SMPS Startup)
HIGH
HIGH
REF
ON
ON
ON
ON
Power-up after
5V SMPS is in
regulation
*
SHDN
is an accurate, low-voltage logic input with 1V falling-edge threshold voltage and 1.6V rising-edge threshold voltage. ON3
and ON5 are 3-level CMOS logic inputs, a logic-low voltage is less than 0.8V, a logic-high voltage is greater than 2.4V, and the mid-
dle logic level is between 1.9V and 2.1V (see the
Electrical Characteristics
table).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1537AETX+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1537ETX | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1537ETX-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1537EVKIT | 制造商:Maxim Integrated Products 功能描述:MAIN POWER SUPPLY CONTROLLER FOR NOTEBOOK - Bulk |
| MAX1538ETI | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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