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| 型号： | MAX8550ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/29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
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.
Power-OK (POK1)
POK1 is an open-drain output for a window comparator
that continuously monitors V OUT . POK1 is actively held
low when SHDNA is low and during the buck regulator
output’s soft-start. After the digital soft-start terminates,
POK1 becomes high impedance as long as the output
voltage is within ±10% of the nominal regulation voltage
set by FB. When V OUT drops 10% below or rises 10%
above the nominal regulation voltage, the MAX8550/
MAX8551 pull POK1 low. Any fault condition forces
POK1 low until the fault latch is cleared by toggling
SHDNA or cycling AV DD power below 1V. For logic-level
output voltages, connect an external pullup resistor
between POK1 and AV DD . A 100k ? resistor works well
in most applications. Note that the POK1 window detec-
tor is completely independent of the overvoltage and
undervoltage-protection fault detectors and the state of
VTTS and VTTR.
SHDNA and Output Discharge
The SHDNA input corresponds to the buck regulator
and places the buck regulator’s portion of the IC in a
low-power mode (see the Electrical Characteristics
table). SHDNA is also used to reset a fault signal such
as an overvoltage or undervoltage fault.
When output discharge is enabled, (OVP/UVP = AV DD
or open) and SHDNA and SHDNB are pulled low, or if
UVP is enabled (OVP/UVP = AV DD ) and V OUT falls to
70% of its regulation set point, the MAX8550 dis-
charges the buck regulator output (through the OUT
input) through an internal 10 ? switch to ground. While
the output is discharging, DL is forced low and the
PWM controller is disabled but the reference remains
active to provide an accurate threshold. Once the out-
put voltage drops below 0.3V, the MAX8550 shuts
down the reference and pulls DL high, effectively
clamping the buck output and LX to ground.
When output discharge is disabled (OVP/UVP = REF or
GND), the controller does not actively discharge the
buck output and the DL driver remains low. Under these
conditions, the buck output discharge rate is determined
by the load current and its output capacitance. The buck
regulator detects and latches the discharge-mode state
set by the OVP/UVP setting on startup.
For the MAX8551, the OVP/UVP is internally connected
to REF, which permanently enables the output dis-
charge feature (see Table 1).
SHDNB and STBY
The SHDNB input corresponds to the VTT and VTTR
outputs, and when driven low, places the linear-regula-
tor portion of the IC in a low-power mode (see the
Electrical Characteristics table). When SHDNB is pulled
low, VTT and VTTR are high impedance.
The STBY input is an active-high input that is used to
shut down only the VTT output. When STBY is high, VTT
is high impedance. The STBY input overrides the
SHDNB input, so even with SHDNB high, if STBY is
high, then the VTT output is inactive.
Power-OK (POK2)
POK2 is the open-drain output for a window compara-
tor that continuously monitors the VTTS input and VTTR
output. POK2 is pulled low when REFIN is less than
0.8V, or when SHDNB is pulled low. POK2 is high
impedance as long as the output voltage is within
±10% of the nominal regulation voltage as set by
REFIN. When V VTTS or V VTTR rises 10% above or 10%
below its nominal regulation voltage, the MAX8550/
MAX8551 pull POK2 low. For logic-level output volt-
ages, connect an external pullup resistor between
POK2 and AV DD . A 100k ? resistor works well in most
applications.
Table 2. Shutdown and Standby Control Logic
STBY
GND
GND
AV DD
GND
GND
SHDNA
AV DD
AV DD
AV DD
GND
GND
SHDNB
AV DD
GND
AV DD
AV DD
GND
BUCK OUTPUT
ON
ON
ON
OFF
OFF
VTT
ON
OFF
OFF
ON
OFF
VTTR
ON
OFF
ON
ON
OFF
16
Maxim Integrated
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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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