The MAX8901 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that includes two circuits demonstrating the MAX8901A and the MAX8901B white LED (WLED) step-up DC-DC converters. Both circuits share a central WLED string and each circuit is selected by on-board jumper positions. The MAX8901B circuit includes a pushbutton circuit to provide single-wire serial-pulse dimming control for the MAX8901B IC. To evaluate the MAX8901A dimming control, an externally applied PWM signal is required. Both evaluation circuits operate from an input voltage of 2.6V to 5.5V and deliver up to 25mA (MAX8901A) or 24.75mA (MAX8901B) of regulated output current to drive from 2 to 6 series-connected WLEDs.
Key Features
Applications/Uses
Two Fully Assembled Circuits with Shared WLEDs
Drives from 2 to 6 WLEDs
Direct PWM (MAX8901A) or Single-Wire Serial Dimming Control (MAX8901B)
On-Board Pushbutton for Single-Wire Serial Dimming Control (MAX8901B)
Constant-Current Regulation for Uniform WLED Illumination
High 87% WLED Efficiency
2.6V to 5.5V Input Range
Input Overvoltage Lockout Protection (6.2V min)
25V (typ) Maximum Output with Overvoltage Protection
Additional Input (VEXT_) for Powering WLEDs from a Separate Supply
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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