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| 型号： | MAX8550AETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/29页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUP DDR INTEG 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 控制器，DDR |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 1.8V，2.5V，0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
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Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
MAX8550A
TO PWM
CONTROLLER
(SEE FIGURE 1)
REF
C REF
ILIM
R A
C ILIM
R B
1.0V
LX
V DD - 1V
Figure 3. Adjustable Current-Limit Threshold
The buck regulator’s internal soft-start allows a gradual
increase of the current-limit level during startup to
I PEAK
I LOAD
reduce the input surge currents. The MAX8550A
divides the soft-start period into five phases. During the
first phase, the controller limits the current limit to only
20% of the full current limit. If the output does not reach
regulation within 425μs, soft-start enters the second
phase, and the current limit is increased by another
20%. This process repeats until the maximum current
limit is reached, after 1.7ms, or when the output reach-
I LOAD(MAX)
I LIMIT
es the nominal regulation voltage, whichever occurs
first. Adding a capacitor in parallel with the external
ILIM resistors creates a continuously adjustable analog
(
I LIM(VAL) = 1 - LIR
2
) x I
LOAD
soft-start function for the buck regulator’s output.
Soft-start in the LDO section can be realized by con-
necting a capacitor between the SS pin and ground.
When VTT is turned off or placed in standby mode, or
0
TIME
during thermal shutdown of the LDOs, the SS capacitor
is discharged. When VTT is turned on or when the ther-
Figure 4. Valley Current-Limit Threshold
(UVLO) circuitry inhibits switching. The controller
inhibits switching by pulling DH low and holding DL low
when OVP and shutdown discharge are disabled
(OVP/UVP = REF or GND) or forcing DL high when OVP
and shutdown discharge are enabled (OVP/UVP =
AV DD or OPEN). See Table 3 for a detailed truth table
for OVP/UVP and shutdown settings. When AV DD rises
above 4.25V, the controller activates the buck regulator
and initializes the internal soft-start.
mal limit is removed, an internal 4μA (typ) current
charges the SS capacitor. The resulting ramp voltage
on SS linearly increases the current-limit comparator
threshold to the VTT output, until full current limit is
attained when SS reaches approximately 1.6V. This
lowering of the current limit during startup limits the ini-
tial inrush current peaks, particularly when driving
capacitors. Choose the value of the SS cap appropri-
ately to set the soft-start time window. Leave SS floating
to disable the soft-start feature.
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8550AETI+ | 功能描述:电压模式 PWM 控制器 Integrated DDR Power Supply Solution RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8550AETI+T | 功能描述:电压模式 PWM 控制器 Integrated DDR Power Supply Solution RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8550AETI-T | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8550ETI | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8550ETI+ | 功能描述:电压模式 PWM 控制器 Integrated DDR Power Supply Solution RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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