8
8
8
4
1rem
1rem
1rem
1rem
rt-dark-800
headline-3
false
true
basicInfoTitle
12
12
12
12
left
buttonParametricSearch
text-with-icon
i18n(button-item.parametric-search.button-label)
i18n(button-item.parametric-search.button-link)
_self
true
buttonDatasheet
text-with-icon
secondary
i18n(button-item.datasheet.button-label)
i18n(button-item.datasheet.button-link)
_self
true
buttonContactUs
text-with-icon
secondary
i18n(button-item.contact-us.button-label)
i18n(button-item.contact-us.button-link)
_self
true
36
24
24
12
rt-dark-800
basicInfoSubtitle
basicInfoImageSwitcher
The RT4540 is a high efficiency driver for white LEDs. It is suitable for single/two cell battery input to drive LED light bars which contains six strings in parallel. The internal current sinks support a maximum of ±2% current mismatching for excellent brightness uniformity in each string of LEDs. To provide enough headroom for current sink operation, the boost controller monitors the minimum voltage of the feedback pins and regulates an optimized output voltage for power efficiency. </p>The RT4540 contains I2C interface for controlling the dimming mode, operating frequency and the LED current. The internal 250mΩ, 36V power switch with current-mode control provides over current protection. </p>The switching frequency of the RT4540 is also adjustable from 100kHz to 1.6MHz, which allows flexibility between efficiency and component size. </p>The RT4540 is available in the WQFN-24L 3x3 with pitch 0.4mm package.</p>
3
RT4540 Typical Circuit
anchor
productDetailSection
i18n(anchor-tab.product-detail-section.title)
productDetailSectionAnchorTab
orderingInformationSection
i18n(anchor-tab.ordering-information-section.title)
orderingInformationSectionAnchorTab
technicalDocumentationSection
i18n(anchor-tab.technical-documentation-section.title)
technicalDocumentationSectionAnchorTab
designToolSection
i18n(anchor-tab.design-tool-section.title)
designToolSectionAnchorTab
applicationSection
i18n(anchor-tab.application-section.title)
applicationSectionAnchorTab
supportSection
i18n(anchor-tab.support-section.title)
supportSectionAnchorTab
24
24
24
24
i18n(tabs.product-detail.title)
productDetailTabs
i18n(tab-item.parameter-section.title)
parameterSection
parameterSectionTab
i18n(tab-item.package-size-pin-size-section.title)
packageSizePinsSizeSection
packageSizePinsSizeSectionTab
i18n(tab-item.product-feature-section.title)
productFeatureSection
productFeatureSectionTab
24
24
24
24
buttonSeeProductDifferences
text-with-icon
right
secondary-m
tertiary
i18n(button-item.see-product-differences.button-label)
i18n(button-item.see-product-differences.button-link)
_self
false
buttonFindOtherCategory
text-with-icon
right
secondary-m
tertiary
i18n(button-item.find-other-category.button-label)
i18n(button-item.find-other-category.button-link)
_self
false
32
32
32
32
scrollable-table
parameterTable
normal-table
table-group
package-size-pins-size
packageSizePinsSizeTable
productFeature
<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage : 2.7V to 24V </li><li>High Output Voltage : Up to 36V </li><li>Channel Current Programmable : 6mA to 25mA </li><li>Channel Current Regulation with Accuracy ±3% and Matching ±2% </li><li>Dimming Controls <ul class="lv2"> <li></li><li>Direct PWM up to 25kHz with Minimum 1% Duty </li><li>PWM to Analog up to 2kHz with 12-Bit Resolution, Up to 4kHz with 11-Bit Resolution, Up to 8kHz with 10-Bit Resolution </li><li>PWM to Mixed Up to 2kHz with 12-Bit Resolution, Up to 4kHz with 11-Bit Resolution, Up to 8kHz with 10-Bit Resolution </li><li>PWM to Mixed-26KHZ up to 2kHz with 12-Bit Resolution, 4kHz with 11-Bit Resolution, Up to 8kHz with10-Bit Resolution </li></ul> </li><li>I2C Programs LED Current, Switching Frequency, Dimming Mode </li><li>Switching Frequency : 100kHz to 1.6 MHz </li><li>Embedded Memory with MTP. </li><li>Protections <ul class="lv2"> <li></li><li>LED Strings Open Protection </li><li>Current Limit Protection </li><li>Programmable Over Voltage Protection </li><li>Over Temperature Protection </li><li>Strings Short Detection </li></ul> </li></ul></div>
24
24
24
24
i18n(tabs.ordering-information.title)
orderingInformationTabs
i18n(tab-item.product-section.title)
productSection
productSectionTab
i18n(tab-item.evb-section.title)
evbSection
evbSectionTab
i18n(tab-item.ordering-detail-section.title)
orderingDetailSection
orderingDetailSectionTab
24
24
24
24
productImageSwitcher
3
RT4540 Ordering Information
normal-table
card-list
products
productTable
evbImageSwitcher
normal-table
card-list
evb
evbTable
orderingDetail
technical-documents
RT4540
technicalDocumentMultipleTable
design-tools
RT4540
designToolMultipleTable
32
56
56
56
rt-blue-800
i18n(text.application-title.text-content)
applicationTitle
withLine
24
24
24
24
<div class="spec-list"><ul class="lv1"><li>Tablet and Notebook LED Backlight </li></ul></div>
applicationContent
35
35
35
35
keywordList
56
56
56
56
rt-blue-800
i18n(text.support-card-title.text-content)
supportCardTitle
withLine
40
40
40
24
supportCards
i18n(support-card-item.technical-support.title)
i18n(support-card-item.technical-support.description)
i18n(support-card-item.technical-support.learn-more-text)
i18n(support-card-item.technical-support.url)
technicalSupportCard
i18n(support-card-item.ordering.title)
i18n(support-card-item.ordering.description)
i18n(support-card-item.ordering.learn-more-text)
i18n(support-card-item.ordering.url)
orderingSupportCard
i18n(support-card-item.sales.title)
i18n(support-card-item.sales.description)
i18n(support-card-item.sales.learn-more-text)
i18n(support-card-item.sales.url)
salesSupportCard
56
56
56
32