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| 型号： | MAX17480EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/48页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX17480 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 3，非隔离 |
| 输入电压： | 4 ~ 26 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX17480 |
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AMD 2-/3-Output Mobile Serial
VID Controller
SVC/SVD
SMPS LOAD
PWRGD UPPER THRESHOLD
SMPS VOLTAGE
BUS IDLE
LIGHT LOAD
UPPER THRESHOLD BLANKED
SMPS TARGET
BUS IDLE
BUS IDLE
HEAVY LOAD
(SMPS TARGET)
PWRGD LOWER
THRESHOLD
PWRGD
BLANK
HIGH-Z
20 μ s
BLANK
HIGH-Z
20 μ s
BLANK
HIGH-Z
20 μ s
Figure 6. VID Transition Timing
t TRAN ? OUT TARGET
t TRAN = ? NEW OLD ?
of a downward VID transition, the upper PWRGD thresh-
old is enabled only after the output reaches the lower
VID code setting. Figure 6 shows VID transition timing.
The MAX17480 automatically controls the current to the
minimum level required to complete the transition in the
calculated time. The slew-rate controller uses an inter-
nal capacitor and current source programmed by
R TIME to transition the output voltage. The total transi-
tion time depends on R TIME , the voltage difference, and
the accuracy of the slew-rate controller (C SLEW
accuracy). The slew rate is not dependent on the total
output capacitance, as long as the surge current is less
than the current limit set by ILIM12 for the core SMPSs
and ILIM3 for the NB SMPS. For all dynamic positive
VID transitions or negative VID transitions in forced-
PWM mode (PSI_L set to 1), the transition time (t TRAN )
is given by:
? V ? V ?
( dV TARGET / dt )
where dV TARGET /dt = 6.25mV/μs × 143k ? /R TIME is the
slew rate, V OLD is the original output voltage, and V NEW
is the new target voltage. See the Slew-Rate Accuracy
in the Electrical Characteristics table for slew-rate limits.
The output voltage tracks the slewed target voltage,
making the transitions relatively smooth. The average
inductor current per phase required to make an output
voltage transition is:
I L ? C OUT × ( dV TARGET / dt )
where dV TARGET /dt is the required slew rate and C OUT
is the total output capacitance of each phase.
If the SMPS is in a pulse-skipping mode (PSI_L set to
0), the discharge rate of the output voltage during
downward transitions is then dependent on the load
current and total output capacitance for loads less than
a minimum current, and dependent on the R TIME pro-
grammed slew rate for heavier loads. The critical load
current (I LOAD(CRIT) ) where the transition time is depen-
dent on the load is:
I LOAD ( CRIT ) ? C OUT × ( dV TARGET / dt )
For load currents less than I LOAD(CRIT) , the transition
time is:
C × dV
I LOAD
For soft-start, the controller uses a fixed slew rate of
1mV/μs. In shutdown, the outputs are discharged using
a 20 ? switch through the CSN_ pins for the core
SMPSs and through the OUT3 pin for the NB SMPS.
Forced-PWM Operation
After exiting the boot mode and if the PSI_L bit is set to
1, the MAX17480 operates with the low-noise, forced-
PWM control scheme. Forced-PWM operation disables
the zero-crossing comparator, forcing the low-side
gate-drive waveforms to constantly be the complement
of the high-side gate-drive waveforms. This keeps the
switching frequency constant and allows the inductor
current to reverse under light loads, providing fast,
accurate negative output-voltage transitions by quickly
discharging the output capacitors.
Forced-PWM operation comes at a cost: the no-load +5V
bias supply current remains between 50mA to 70mA,
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17480EVKIT+ | 功能描述:电源管理IC开发工具 MAX17480 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 |
| MAX17480GTL+ | 功能描述:显示驱动器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17480GTL+T | 功能描述:显示驱动器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17482GTL+ | 功能描述:电压模式 PWM 控制器 NDA IC 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 |
| MAX17482GTL+T | 功能描述:电压模式 PWM 控制器 NDA IC 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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