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参数资料
| 型号： | MAX17000ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/32页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR DDR/DDR2/DDR3 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | Quick-PWM™ |
| 应用： | 存储器，DDR2/DDR3 稳压器 |
| 电流 - 电源： | 2mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
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MAX17000
Complete DDR2 and DDR3 Memory
Power-Management Solution
stresses and thus drives the selection of input
capacitors, MOSFETs, and other critical heat-con-
tributing components. Most notebook loads gener-
iron is inexpensive and can work well at 200kHz. The
core must be large enough not to saturate at the peak
inductor current (I PEAK ):
I PEAK = I LOAD ( MAX ) × ? 1 +
2 ?
?
ally exhibit I LOAD = I LOAD(MAX) x 80%.
Switching Frequency: This choice determines the
basic trade-off between size and efficiency. The
?
?
LIR ?
?
optimal frequency is largely a function of maximum
input voltage, due to MOSFET switching losses that
are proportional to frequency and V IN 2 . The opti-
mum frequency is also a moving target, due to
rapid improvements in MOSFET technology that are
making higher frequencies more practical.
Setting the Valley Current Limit
The minimum current-limit threshold must be high
enough to support the maximum load current when the
current limit is at the minimum tolerance value. The val-
ley of the inductor current occurs at I LOAD(MAX) minus
half the ripple current; therefore:
I LIMIT ( LOW ) > I LOAD ( MAX ) × ? 1 ?
2 ?
?
Inductor Operating Point: This choice provides
trade-offs between size vs. efficiency and transient
response vs. output noise. Low inductor values pro-
?
?
LIR ?
?
vide better transient response and smaller physical
size, but also result in lower efficiency and higher
output noise due to increased ripple current. The
minimum practical inductor value is one that causes
the circuit to operate at the edge of critical conduc-
tion (where the inductor current just touches zero
with every cycle at maximum load). Inductor values
lower than this grant no further size-reduction bene-
fit. The optimum operating point is usually found
between 20% and 50% ripple current.
Inductor Selection
The switching frequency and operating point (% ripple
current or LIR) determine the inductor value as follows:
where I LIMIT(LOW) equals the minimum current-limit
threshold voltage divided by the output sense element
(inductor DCR or sense resistor).
The valley current limit is fixed at 17mV (min) across the
CSH to CSL differential input.
Special attention must be made to the tolerance and
thermal variation of the on-resistance in the case of DCR
sensing. Use the worst-case maximum value for R DCR
from the inductor data sheet, and add some margin for
the rise in R DCR with temperature. A good general rule
is to allow 0.5% additional resistance for each °C of
temperature rise, which must be included in the design
? V OUT ?
V IN ? V OUT
? V IN ? ?
? × ?
?
L = ?
?
?
f SW × I LOAD ( MAX ) × LIR ?
margin unless the design includes an NTC thermistor in
the DCR network to thermally compensate the current-
limit threshold.
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. Ferrite
cores are often the best choice, although powdered
INPUT (V IN )
The current-sense method (Figure 7) and magnitude
determine the achievable current-limit accuracy and
power loss. The sense resistor can be determined by:
R SENSE = V LIMIT /I LIMIT
DH
N H
C IN
SENSE RESISTOR
MAX17000
LX
DL
N L
D L
L
L ESL
R EQ
R SENSE
C EQ
C OUT
C EQ R EQ =
L ESL
R SENSE
PGND1
CSH
CSL
A) OUTPUT SERIES RESISTOR SENSING
Figure 7a. Current-Sense Configurations (Sheet 1 of 2)
24
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17000ETG+ | 功能描述:电压模式 PWM 控制器 DDR2 & DDR3 Memory Power-Mgt 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 |
| MAX17000ETG+T | 功能描述:电压模式 PWM 控制器 DDR2 & DDR3 Memory Power-Mgt 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 |
| 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 |
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