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MAX15035 pdf datasheet (15A、降压
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The MAX15035 pulse-width modulation (PWM) controller
provides high efficiency, excellent transient response,
and high DC-output accuracy. Combined with the internal
low on-resistance MOSFETs, the MAX15035 provides
a highly efficient and compact solution for small
form factor applications that need a high-power density.
Maxim’s proprietary Quick-PWM™ quick-response,
constant on-time PWM control scheme handles wide
input/output voltage ratios (low-duty-cycle applications)
with ease and provides 100ns instant-on response to
load transients while maintaining a relatively constant
switching frequency. The output voltage can be dynamically
controlled using the dynamic REFIN, which supports
input voltages between 0V to 2V. The REFIN
adjustability combined with a resistive voltage-divider
on the feedback input allows the MAX15035 to be configured
for any output voltage between 0V to 0.9VIN.
The controller senses the current across the synchronous
rectifier to achieve a low-cost and highly efficient
valley current-limit protection. External current-limit control
is provided to allow higher current-limit settings for
applications with heatsinks and air flow, or for lower
current applications that need lower current-limit settings
to avoid overdesigning the application circuit. The
adjustable current limit provides a high degree of flexibility,
allowing thermally compensated protection or
foldback current-limit protection using a voltage-divider
partially derived from the output.
The MAX15035 includes a voltage-controlled soft-start
and soft-shutdown to limit the input surge current, provide
a monotonic power-up into a precharged output,
and provide a predictable soft-start time. The controller
also includes output fault protection—undervoltage and
overvoltage protection—as well as thermal-fault protection.
The MAX15035 is available in a small 40-pin, 6mm x 6mm,
TQFN package.
MAX15035脉宽调制(PWM)控制器具有高效率、出色的瞬态响应和极高的直流输出精度。与内部低导通电阻MOSFET相结合，MAX15035能够为大功率密度的小外型应用提供高效紧凑的解决方案。
Maxim专有的Quick-PWM™快速响应、固定导通时间PWM控制架构可轻松应对宽输入/输出电压比(低占空比)，并对负载瞬变提供100ns的快速瞬态响应，并可保持相对固定的开关频率。采用动态REFIN能够动态控制输出电压，该动态电压支持0V至2V输入范围。REFIN调节与反馈输入端的电阻分压器相结合，可将MAX15035输出电压设置在0V至0.9VIN之间。
控制器检测流过同步整流器的电流，从而实现低成本、高效谷电流限制保护。外部限流控制允许设置较高的电流门限，用于需要散热和空气流通的设备，或用于需要较低限流门限以避免超安全标准设计的低电流应用场合。可调节的限流阀值提高了设计灵活性，通过采用输出分压方式能够实现热补偿保护或折返式限流保护。
MAX15035包含电压控制的软启动和软关断，有效抑制输入浪涌电流，保证单调上电并进入预充电压，可预置软启动时间。该控制器还具有输出故障保护功能(欠压和过压)以及热保护功能。
MAX15035采用小尺寸40引脚、6mm x 6mm、TQFN封装。
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