Datasheet MAX25600 (Maxim)

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MAX25600 Synchronous High-Voltage Four-Switch Buck- Boost LED Controller General Description Benefits and Features
The MAX25600 is a synchronous 4-switch buck-boost ● Automotive Ready: AEC-Q100 Qualified LED driver controller. The controller regulates the LED ● Integration Minimizes BOM for High-Brightness LED current for LED string voltages from 0V to 60V. The Driver, Saving Space and Reducing Cost MAX25600 can be used as a seamless buck-boost LED • Wide Input Voltage Range from 5V to 60V driver for applications that require an efficient buck-boost LED driver with synchronous rectification. The MAX25600 • H-Bridge Single Inductor Buck-Boost Architecture is ideal for high-power applications that require a current • Constant-Current and Constant-Voltage Regulation source with PWM dimming capability. • 28-pin TSSOP with EP Pad and 28-pin (5mm x 5mm) TQFN with EP Pad Packages The device provides seamless transition between buck, boost, and buck-boost modes depending on the ratio of ● Wide Dimming Ratio allows High Contrast Ratio input to output voltage. The MAX25600 is ideal for LED • Analog and PWM Dimming driver applications in automotive, industrial, and other • Flicker-Free PWM Dimming with Spread Spectrum LED lighting applications. A fault flag indicates open LED, • Integrated pMOS Dimming FET Gate Driver shorted LED, or thermal shutdown conditions. The device • 200Hz On-Board Ramp Simplifies PWM Dimming uses Maxim's proprietary average-current-mode control ● Protection Features and Wide Temperature Range scheme and allows adjustable 200kHz to 700kHz fixed- Increase System Reliability frequency operation. In addition, ±6% triangular spread • Short Circuit,Overvoltage, and Thermal Protection spectrum is added internally to the oscillator to improve • LED Current Monitor and Input Current Limiter EMI performance. The MAX25600 provides both analog • -40ºC to +125ºC Operating Junction-Temperature and digital PWM dimming, and has built-in analog PWM Range dimming at a dimming frequency of 200Hz. The adjust- able soft-start feature limits the current peaks and volt- age overshoots at startup. The MAX25600 integrates a
Simplified Application Circuit
high-side p-channel dimming MOSFET driver for PWM dimming applications that require fast rising and fall- INPUT RIN VOUT ing edges of the LED current. It also features robust CIN COUT output open and short protection, is AEC qualified, and is INP INN suitable for automotive applications. INPUT DH1 N1 N3 DH2 AND BIAS L1
Applications
LX1 RT, SS LX2 ● Automotive Exterior Lighting and General, DL1 N2 N4 DL2 FLT Commercial, and Industrial Lighting IOUTV CSP VOUT FB ISP
Ordering Information
appears at end of data sheet.
MAX25600
RSENSE PWM AND RCS_LED ANALOG CSN DIMMING DH2 ISN ISP, ISN LX2 P1 COMP DL2 CCOMP DIMOUT RCOMP 19-100409; Rev 1; 1/19