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| 型号： | MAX17000EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/32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
The MAX17000 always uses skip mode during startup,
regardless of the SKIP and STDBY setting. The SKIP
and STDBY controls take effect after soft-start is done.
See Figure 3.
Forced-PWM Mode ( SKIP = V CC )
The low-noise forced-PWM mode ( SKIP = V CC ) disables
the zero-crossing comparator, which controls the low-
side switch on-time. This forces the low-side gate-drive
waveform to constantly be the complement of the high-
side gate-drive waveform, so the inductor current
reverses at light loads while DH maintains a duty factor
of V OUT /V IN . The benefit of forced-PWM mode is to keep
a fairly constant switching frequency. However, forced-
PWM operation comes at a cost: the no-load 5V bias
current remains between 2mA to 20mA, depending on
the switching frequency.
STDBY = AGND overrides the SKIP pin setting, forcing
the MAX17000 into standby.
The MAX17000 switches to forced-PWM mode during
shutdown, regardless of the state of SKIP and STDBY
levels.
Standby Mode ( STDBY )
It should be noted that standby mode in the MAX17000
corresponds to computer system standby operation,
and is not referring to the MAX17000 shutdown status.
When standby mode is enabled ( STDBY = AGND), the
MAX17000 switches over from the fast internal PWM
block to a low-quiescent current mode using a low-
power valley comparator to initiate an on-time pulse.
The zero-crossing comparator is enabled so that the
Δ I
Δ t
=
V IN - V OUT
L
I PEAK
MAX17000 only operates in discontinuous mode,
reducing the maximum available output current by 1/6.
The system is NOT expected to have any fast load tran-
sients in such a state. While in standby, VTT is disabled
(high impedance) but VTTR remains active. SKIP is
ignored when standby mode is enabled.
I LOAD = I PEAK /2
When standby mode is disabled ( STDBY = V CC ), the
MAX17000 reenables its fast internal PWM block. Once
the internal SMPS block is ready, the VTT block is
enabled and the VTT output capacitor is charged. The
0
ON-TIME
TIME
VTT soft-start current limit increases linearly from zero
to its maximum current limit in 160μs (typ), keeping the
Figure 3. Pulse-Skipping/Discontinuous Crossover Point
STDBY
SMPS_RUNOK
SMPS OUTPUT
VTTR OUTPUT
VTT OUTPUT
input VTTI inrush low. See Figure 4.
< 50 μ s
VTT HIGH IMPEDANCE
VTT CURRENT LIMIT
160 μ s
PGOOD1
PGOOD2
Figure 4. MAX17000 Standby Mode Timing
Maxim Integrated
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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