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| 型号： | MAX17000EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/32页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX17000 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，DDR 存储器电源 |
| 输出及类型： | 3，非隔离 |
| 功率 - 输出： | 19.8W |
| 输出电压： | 1.8V，0.9V，0.9V |
| 电流 - 输出： | 10A，2A，3mA |
| 输入电压： | 7 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX17000 |
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MAX17000
Complete DDR2 and DDR3 Memory
Power-Management Solution
INPUT (V IN )
DH
N H
C IN
INDUCTOR
LX
L
R DCR
R CS =
R2
R1 + R2
R DCR
MAX17000 DL
PGND1
N L
D L
R1
R2
C EQ
C OUT
L
R DCR = C EQ
[ R1 R2 1 + 1 ]
CSH
CSL
B) LOSSLESS INDUCTOR SENSING
Figure 7b. Current-Sense Configurations (Sheet 2 of 2)
For the best current-sense accuracy and overcurrent
protection, use a 1% tolerance current-sense resistor
between the inductor and output as shown in Figure 7a.
This configuration constantly monitors the inductor cur-
rent, allowing accurate current-limit protection.
However, the parasitic inductance of the current-sense
resistor can cause current-limit inaccuracies, especially
when using low-value inductors and current-sense
resistors. This parasitic inductance (L ESL ) can be can-
celled by adding an RC circuit across the sense resis-
tor with an equivalent time constant:
FOR THERMAL COMPENSATION:
R2 SHOULD CONSIST OF AN NTC RESISTOR IN
SERIES WITH A STANDARD THIN-FILM RESISTOR.
MOSFET Gate Drivers (DH, DL)
The DH and DL drivers are optimized for driving moder-
ate-sized high-side, and larger low-side power MOSFETs.
This is consistent with the low duty factor seen in note-
book applications, where a large V IN - V OUT differential
exists. The high-side gate driver (DH) sources and sinks
1.2A, and the low-side gate driver (DL) sources 1.0A and
sinks 2.4A. This ensures robust gate drive for high-cur-
rent applications. The DH high-side MOSFET driver is
powered by an internal boost switch charge pump at
BST, while the DL synchronous-rectifier driver is pow-
C EQ × R EQ =
L ESL
R SENSE
ered directly by the 5V bias supply (V DD ).
PWM Output Capacitor Selection
The output filter capacitor must have low enough effec-
Alternatively, low-cost applications that do not require
highly accurate current-limit protection could reduce
the overall power dissipation by connecting a series RC
circuit across the inductor (Figure 7b) with an equiva-
lent time constant:
tive series resistance (ESR) to meet output ripple and
load-transient requirements, yet have high enough ESR
to satisfy stability requirements.
In core and chipset converters and other applications
where the output is subject to large-load transients, the
R CS =
R 2
R 1 + R 2
× R DCR
output capacitor’s size typically depends on how much
ESR is needed to prevent the output from dipping too
low under a load transient. Ignoring the sag due to finite
capacitance:
× ?
+
( R ESR + R PCB ) ≤ Δ I
and:
R DCR =
L
C EQ
? 1 1 ?
? R 1 R 2 ? ?
V STEP
LOAD ( MAX )
In low-power applications, the output capacitor’s size
where R CS is the required current-sense resistance,
and R DCR is the inductor’s series DC resistance. Use
the worst-case inductance and R DCR values provided
by the inductor manufacturer, adding some margin for
the inductance drop over temperature and load.
Maxim Integrated
often depends on how much ESR is needed to maintain
an acceptable level of output ripple voltage. The output
ripple voltage of a step-down controller equals the total
inductor ripple current multiplied by the output capaci-
tor’s ESR.
25
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相关代理商/技术参数 |
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|---|---|
| MAX17000EVKIT+ | 功能描述:电源管理IC开发工具 MAX17000 Eval Kit 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 |
| MAX17003AETJ+ | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller 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 |
| MAX17003AETJ+T | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller 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 |
| MAX17003ETJ+ | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller 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 |
| MAX17003ETJ+T | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller 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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