In this reference design, the buck-boost converter (referenced to the input voltage) generates a 350mA current that drives four white LEDs (WLEDs) from a 7V to 18V DC supply and is designed to use the MAX16834 current-mode high-brightness (HB) LED driver .
LED driver specification
Input voltage: 7V to 18V
Input voltage ripple: 100mVP-P
LED current: 350mA
LED current ripple: 5% (maximum)
LED forward voltage: 3.5V (at 350mA)
Number of LEDs: 4 (maximum)
Output overvoltage protection: 17.2V
Input
VIN, PGND: power input PWMDIM, SGND: PWM dimming input
Output
LED+: connect LED anode to LED+
LED-: Connect LED cathode to LED-
Figure 2. LED driver schematic
Component List* (Bill of Materials BOM)
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