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| 型号： | MAX8550ETI+ |
| 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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MAX8550/MAX8551
Integrated DDR Power-Supply Solutions for
Desktops, Notebooks, and Graphic Cards
MAX8550/
TO PWM
CONTROLLER
(SEE FIGURE 1)
MAX8551
REF
C REF
ILIM
R A
C ILIM
R B
1.0V
LX
V DD - 1V
Figure 3. Adjustable Current-Limit Threshold
(OVP/UVP = REF or GND) or forcing DL high when OVP
and shutdown discharge are enabled (OVP/UVP =
I PEAK
I LOAD
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.
The buck regulator’s internal soft-start allows a gradual
increase of the current-limit level during startup to
reduce the input surge currents. The MAX8550/
MAX8551 divide the soft-start period into five phases.
(
I LOAD(MAX)
I LIM(VAL) = 1 - LIR
2
I LIMIT
) x I LOAD
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
reaches the nominal regulation voltage, whichever
0
TIME
occurs first. Adding a capacitor in parallel with the
external ILIM resistors creates a continuously
Figure 4. Valley Current-Limit Threshold
POR, UVLO, and Soft-Start
Internal power-on reset (POR) occurs when AV DD rises
above approximately 2V, resetting the fault latch and
the soft-start counter, powering up the reference, and
preparing the buck regulator for operation. Until AV DD
reaches 4.25V (typ), AV DD undervoltage-lockout
(UVLO) circuitry inhibits switching. The controller
inhibits switching by pulling DH low and holding DL low
when OVP and shutdown discharge are disabled
Maxim Integrated
adjustable analog soft-start function for the buck regu-
lator’s output.
Soft-start in the LDO section can be realized by con-
necting a capacitor between the SS pin and ground.
When SHDNB is driven low, or during thermal shut-
down of the LDOs, the SS capacitor is discharged.
When SHDNB is driven high or when the thermal limit is
removed, an internal 4μA (typ) current charges the SS
capacitor. The resulting ramp voltage on SS linearly
increases the current-limit comparator thresholds to
both the VTT and VTTR outputs, until full current limit is
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX8550ETI+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 |
| MAX8550ETI-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 |
| MAX8550EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8551ETI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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