Datasheet MAX25610A, MAX25610B (Maxim)

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MAX25610A/MAX25610B Synchronous Buck and Buck-Boost LED Driver/DC-DC Converter General Description Benefits and Features
The MAX25610A/MAX25610B are fully synchronous ● Automotive Ready: AEC-Q100 Qualified LED drivers that provide constant output current to ● Integration Minimizes BOM to Save Space and Cost drive high-power LEDs. The MAX25610A/MAX25610B • Wide input Voltage Range from 5V to 36V in Buck- integrate two 60mΩ power MOSFETs for synchronous Boost LED Driver Applications operation, minimizing external components. Flexible • 2.2MHz Switching Frequency Option Reduces configuration supports buck, inverting buck-boost, and Inductor Size boost conversion. The devices incorporate current- • Internal Current-Sense Option Reduces Cost mode control that provides fast transient response and • Integrated High and Low-Side Switching MOSFETs eases loop stabilization. The MAX25610A/MAX25610B • PWM Dimming with an Analog Control Voltage include cycle by cycle current limiting, output overvoltage Minimizes Additional Components for Dimming protection (OVP), open-string protection, output short- circuit protection (SCP), and thermal shutdown. ● Wide Dimming Ratio Allows High Contrast Ratio • Analog and PWM Dimming In LED driver applications, the MAX25610A/MAX25610B provide analog dimming of the LED current through the ● Multi-Topology Architecture Provides Flexibility REFI pin, and PWM dimming through the PWMDIM • Buck LED Driver for 1-to-2 LEDs When Operating pin. Switching is enabled when PWMDIM is high, and of Automotive Battery Applications disabled with both MOSFETs off when PWMDIM is low. • Inverting Buck-Boost LED Driver for 3-to-5 LEDs Analog programming of the PWMDIM pin enables the When Operating from Automotive Battery built-in digital dimming function, with dimming frequency Applications selected by the PWMFRQ pin. ● Protection Features and Wide Temperature Range The MAX25610A/MAX25610B include two 5V regulators. Increase System Reliability A regulated 5V between V • -40°C to +125°C Operating Temperature Range CC and AGND is used for IC bias, REFI and PWMFRQ programming. Another low • Short-Circuit, Overvoltage, and Thermal Protection current regulated 5V between V • FLT Flag for Fault Indication EE and INN is used for analog PWMDIM and FLT pullup. Both PWMDIM and
Ordering Information
appears at end of data sheet. FLT reference INN for easy system interface. Switching frequency is internally set at 400kHz for the MAX25610A
Simplified Application Circuit
and 2.2MHz for the MAX25610B. The devices have built- in spread spectrum to reduce EMI noise. External and internal current sense are supported, with ±3% and ±6% VIN+ INP C BST BST respective LED current accuracy. C L BATTERY GND IN V CIN2 V IN- IN- LX The MAX25610A/MAX25610B are well-suited for INN LX IC-GND automotive applications requiring high voltage input and ROUT1 CVEE OUT can withstand load dump events up to 40V. The devices VEE LED1 PWM or can also be used as a DC-DC converter using the ANALOG PWMDIM COUT DIMMING
MAX25610A
R FB input as feedback for the output voltage divider. OUT2 OPEN-DRAIN FLT The MAX25610A/MAX25610B are available in thermally FAULT enhanced 16-pin TSSOP-EP and 16-pin TQFN packages. CPWMFRQ PGND LEDn PWMFRQ VCC They are specified to operate over the -40ºC to +125ºC R 100kΩ PWMFRQ automotive temperature range. FB VCC COMP CCOMP CVCC
Applications
IC-GND RREFI REFI DOMAIN ● Automotive Lighting Applications AGND RCOMP ● Industrial Lighting Applications 19-100449; Rev 1; 12/18