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Synchronous Boost and Synchronous Buck LED Controllers

Automotive Synchronous Boost Controller with Buck LED Controller Optimizes 2 Stage LED Lighting Designs

产品详情

The MAX25601A/B/C/D is a synchronous boost controller followed by a synchronous buck LED controller. The 4.5V to 40V input voltage range of the boost controller is ideal for automotive applications, and acts as a pre-boost power supply for the second-stage buck LED controller.

The synchronous boost is a current-mode controller that can be be paralleled with another device to provide higher output power. A SYNCOUT pin provides the clock to drive the RT/SYNCIN pin of the other device, enabling two-phase 180-degree out-of-phase operation. The boost converter can be programmed with a switching frequency of 200kHz to 2.2MHz. Spread spectrum is included to reduce EMI. An internal digital soft-start feature is provided to enable a smooth power up of the boost output. Protection features like hiccup mode, overvoltage protection, and thermal shutdown are provided.

The synchronous buck LED controller uses Maxim's F3 Architecture, a proprietary average-current-mode control scheme to regulate the inductor current at a constant switching frequency without any control-loop compensation. Inductor current is sensed in the bottom synchronous n-channel MOSFET. The device operates over a wide 4.5V to 65V input range at switching frequencies as high as 1MHz. Both analog and PWM dimming are included. LED current can be monitored on the IOUTV pin.

Both controllers have high- and low-side gate drivers with at least 1A peak source and sink-current capability. Adaptive non-overlap control logic prevents shoot-through currents during transition. Both the boost and the buck faults are monitored on the active-low FLT pin.

The MAX25601A/C is available in a 32-pin SWTQFN package and the MAX25601B/D is available in a 28-pin TSSOP package. The 32-pin package features an additional switch control that can be used in high-beam/low-beam and heads-up display applications.

主要特征

  • Integration Minimizes BOM for High-Brightness LED Driver, Saving Space and Cost
    • Wide Input-Voltage Range from 4.5V to 40V
    • Wide Boost-Output Range up to 65V
    • Programmable Switching Frequency Optimizes Component Size
    • External MOSFETs Can be Sized for Appropriate Current
    • Synchronous Rectification Provides High Efficiency and Fast Transient Response
    • Average Current-Mode Control for Buck Eliminates Compensation Components
  • Wide Dimming Ratio Allows High Contrast Ratio
    • Analog Dimming and PWM Dimming
    • Analog Voltage-Controlled PWM Dimming
  • Protection Features and Wide Temperature Range Increase System Reliability
    • Short Circuit, Overvoltage, and Thermal Protection
    • -40°C to +125°C Operating Temperature Range

应用/用途

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  • 商业、工业和建筑照明
Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 40
Max. No. of LEDs 15
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 30
PWM Dimming Freq. (kHz) (max) 2
Dimming Ratio (max) -
Dimming Control Analog
Analog Controlled PWM
PWM
VCURR_SENSE (mV) 200
POUT (W) 100
ICC (mA) (max) -
LED String Volt. (V) (max) 60
Switching Frequency (kHz) 100
1000
Package/Pins TQFN-CU/32
Budgetary
Price (See Notes)
$2.58 @1k

简化框图

MAX25601A, MAX25601B, MAX25601C, MAX25601D: Simplified Application Circuit MAX25601A, MAX25601B, MAX25601C, MAX25601D: Simplified Application Circuit Zoom icon

技术文档

设计与质量

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描述

The MAX25601 evaluation kit (EV kit) provides a proven design to evaluate the MAX25601A/MAX25601C automotive high-voltage, high-brightness LED (HB LED) boost-buck controller. The front-end pre-boost operates from a 7.7V to 18V DC supply voltage, generating a 48V output. The buck supports 12x LEDs and lower, delivering up to 1.5A to one string of LEDs. The total voltage of the string can vary from 3V to 36V.

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特征

  • Configured for Pre-Boost and Buck Application
  • Analog Dimming Control
  • Proven PCB Layout
  • Fully Assembled and Tested

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参量

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 40
Max. No. of LEDs 15
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 30
PWM Dimming Freq. (kHz) (max) 2
Dimming Ratio (max) -
Dimming Control Analog
Analog Controlled PWM
PWM
VCURR_SENSE (mV) 200
POUT (W) 100
ICC (mA) (max) -
LED String Volt. (V) (max) 60
Switching Frequency (kHz) 100
1000
Package/Pins TQFN-CU/32
Budgetary
Price (See Notes)
$2.58 @1k

主要特征

  • Integration Minimizes BOM for High-Brightness LED Driver, Saving Space and Cost
    • Wide Input-Voltage Range from 4.5V to 40V
    • Wide Boost-Output Range up to 65V
    • Programmable Switching Frequency Optimizes Component Size
    • External MOSFETs Can be Sized for Appropriate Current
    • Synchronous Rectification Provides High Efficiency and Fast Transient Response
    • Average Current-Mode Control for Buck Eliminates Compensation Components
  • Wide Dimming Ratio Allows High Contrast Ratio
    • Analog Dimming and PWM Dimming
    • Analog Voltage-Controlled PWM Dimming
  • Protection Features and Wide Temperature Range Increase System Reliability
    • Short Circuit, Overvoltage, and Thermal Protection
    • -40°C to +125°C Operating Temperature Range

应用/用途

  • null
  • 商业、工业和建筑照明

描述

The MAX25601A/B/C/D is a synchronous boost controller followed by a synchronous buck LED controller. The 4.5V to 40V input voltage range of the boost controller is ideal for automotive applications, and acts as a pre-boost power supply for the second-stage buck LED controller.

The synchronous boost is a current-mode controller that can be be paralleled with another device to provide higher output power. A SYNCOUT pin provides the clock to drive the RT/SYNCIN pin of the other device, enabling two-phase 180-degree out-of-phase operation. The boost converter can be programmed with a switching frequency of 200kHz to 2.2MHz. Spread spectrum is included to reduce EMI. An internal digital soft-start feature is provided to enable a smooth power up of the boost output. Protection features like hiccup mode, overvoltage protection, and thermal shutdown are provided.

The synchronous buck LED controller uses Maxim's F3 Architecture, a proprietary average-current-mode control scheme to regulate the inductor current at a constant switching frequency without any control-loop compensation. Inductor current is sensed in the bottom synchronous n-channel MOSFET. The device operates over a wide 4.5V to 65V input range at switching frequencies as high as 1MHz. Both analog and PWM dimming are included. LED current can be monitored on the IOUTV pin.

Both controllers have high- and low-side gate drivers with at least 1A peak source and sink-current capability. Adaptive non-overlap control logic prevents shoot-through currents during transition. Both the boost and the buck faults are monitored on the active-low FLT pin.

The MAX25601A/C is available in a 32-pin SWTQFN package and the MAX25601B/D is available in a 28-pin TSSOP package. The 32-pin package features an additional switch control that can be used in high-beam/low-beam and heads-up display applications.

简化框图

MAX25601A, MAX25601B, MAX25601C, MAX25601D: Simplified Application Circuit MAX25601A, MAX25601B, MAX25601C, MAX25601D: Simplified Application Circuit Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索您所需的答案。

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Maxim专业的应用工程师团队也可以为您解答技术问题,请 访问Maxim的 支持中心