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参数资料
| 型号： | MAX15039EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/19页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX15039 |
| 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： | 1，非隔离 |
| 输出电压： | 0.6 ~ 4.5V |
| 电流 - 输出： | 6A |
| 输入电压： | 2.9 ~ 5.5 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： | MAX15039 |
6A, 2MHz Step-Down Regulator
with Integrated Switches
The MAX15039 is also able to start into prebiased with
the output above the nominal set point without abruptly
discharging the output, thanks to the sink current con-
trol of the low-side switch through a 4-step DAC in 128
clock cycles. Monotonic startup mode automatically
switches to forced-PWM mode 4096 clock cycles delay
after the voltage at FB increases above 92.5% of
V REFIN . The additional delay prevents an early transi-
tion from monotonic startup to forced-PWM mode dur-
ing soft-start when a prolonged time constant external
REFIN voltage is applied.
The maximum allowed soft-start time is 2ms when an
external reference is applied at REFIN in the case of
starting up into prebiased output.
Skip Mode
Connect MODE to V DD to select skip mode. In skip
mode, the MAX15039 switches only as necessary to
maintain the output at light loads (not capable of sinking
current from the output), but still operates with fixed-fre-
quency (set by the resistor at FREQ terminal) PWM at
medium and heavy loads. This maximizes light-load effi-
ciency and reduces the input quiescent current.
In case of prolonged high-side idle activity (beyond
eight clock cycles), the low-side switch is turned on
briefly to rebuild the charge lost in the bootstrap capac-
itor before the next on-cycle of the high-side switch.
In skip mode, the low-side switch is turned off when the
inductor current decreases to 0.2A (typ) to ensure no
reverse current flowing from the output capacitor and
the best conversion efficiency/minimum supply current.
The high-side switch minimum on-time is controlled to
guarantee that 0.9A current is reached to avoid high
frequency bursts at no load conditions and that might
cause a rapid increase of the supply current caused by
additional switching losses.
Even if skip mode is selected at the device turn-on, the
monotonic startup mode is internally selected during
soft-start. The transition to skip mode is automatically
achieved 4096 clock cycles after the voltage at FB
increases above 92.5% of V REFIN .
Changing from skip mode to forced-PWM mode and
vice-versa can be done at any time. The output capaci-
tor should be large enough to limit the output-voltage
overshoot/undershoot due to the settling times to reach
different duty-cycle set points corresponding to forced-
PWM mode and skip mode at light loads.
PCB Layout Considerations and
Thermal Performance
Careful PCB layout is critical to achieve clean and sta-
ble operation. It is highly recommended to duplicate the
MAX15039 EV kit layout for optimum performance. If devi-
ation is necessary, follow these guidelines for good PCB
layout:
1) Connect input and output capacitors to the power
ground plane; connect all other capacitors to the sig-
nal ground plane.
2) Place capacitors on V DD , IN, and SS as close as pos-
sible to the IC and its corresponding pin using direct
traces. Keep power ground plane (connected to
PGND) and signal ground plane (connected to GND)
separate.
3) Keep the high-current paths as short and wide as
possible. Keep the path of switching current short
and minimize the loop area formed by LX, the out-
put capacitors, and the input capacitors.
4) Connect IN, LX, and PGND separately to a large
copper area to help cool the IC to further improve
efficiency and long-term reliability.
5) Ensure all feedback connections are short and
direct. Place the feedback resistors and compensa-
tion components as close as possible to the IC.
6) Route high-speed switching nodes, such as LX,
away from sensitive analog areas (FB, COMP).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15039EVKIT+ | 功能描述:电源管理IC开发工具 6A 2MHz Step-Down w/Integrated Switch 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 |
| MAX1503XETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1503YETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1503ZETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX15040EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH EFFICIENCY 4A DC/DC REGULATOR - Rail/Tube |
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