MAX15035 pdf datasheet (15A、降壓

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脈寬調(diào)制(PWM)控制器具有高效率、出色的瞬態(tài)響應(yīng)和極高的直流輸出精度。與內(nèi)部低導(dǎo)通電阻MOSFET相結(jié)合，MAX15035能夠?yàn)榇蠊β拭芏鹊男⊥庑蛻?yīng)用提供高效緊湊的解決方案。

Maxim專(zhuān)有的Quick-PWM?快速響應(yīng)、固定導(dǎo)通時(shí)間PWM控制架構(gòu)可輕松應(yīng)對(duì)寬輸入/輸出電壓比(低占空比)，并對(duì)負(fù)載瞬變提供100ns的快速瞬態(tài)響應(yīng)，并可保持相對(duì)固定的開(kāi)關(guān)頻率。采用動(dòng)態(tài)REFIN能夠動(dòng)態(tài)控制輸出電壓，該動(dòng)態(tài)電壓支持0V至2V輸入范圍。REFIN調(diào)節(jié)與反饋輸入端的電阻分壓器相結(jié)合，可將MAX15035輸出電壓設(shè)置在0V至0.9V_IN之間。

控制器檢測(cè)流過(guò)同步整流器的電流，從而實(shí)現(xiàn)低成本、高效谷電流限制保護(hù)。外部限流控制允許設(shè)置較高的電流門(mén)限，用于需要散熱和空氣流通的設(shè)備，或用于需要較低限流門(mén)限以避免超安全標(biāo)準(zhǔn)設(shè)計(jì)的低電流應(yīng)用場(chǎng)合。可調(diào)節(jié)的限流閥值提高了設(shè)計(jì)靈活性，通過(guò)采用輸出分壓方式能夠?qū)崿F(xiàn)熱補(bǔ)償保護(hù)或折返式限流保護(hù)。

MAX15035包含電壓控制的軟啟動(dòng)和軟關(guān)斷，有效抑制輸入浪涌電流，保證單調(diào)上電并進(jìn)入預(yù)充電壓，可預(yù)置軟啟動(dòng)時(shí)間。該控制器還具有輸出故障保護(hù)功能(欠壓和過(guò)壓)以及熱保護(hù)功能。

MAX15035采用小尺寸40引腳、6mm x 6mm、TQFN封裝。