MAX17127 Datasheet | Maxim Integrated

Description Features S 5V to 26V Input Supply Voltage S Up to Six Parallel Strings Multiple Series- The MAX17127 is a high-efficiency driver for white lightemitting diodes (LEDs). It is designed for large liquidcrystal displays (LCDs) that employ an array of LEDs as the light source. An internal switch current-mode step-up converter drives the LED array, which can be configured for up to six strings in parallel and 13 LEDs per string. Each string is terminated with ballast that achieves Q2% current-regulation accuracy, ensuring even LED brightness. The MAX17127 has a wide input voltage range from 5V to 26V, and provides adjustable 10m A to 30m A full-scale LED current. The MAX17127 can implement brightness control through the PWM signal input, and LED current is directly controlled by the external dimming signal’s frequency and duty cycle. The MAX17127 has multiple features to protect the controller from fault conditions. Once an open/short string is detected, the fault string is disabled while other strings can still operate normally. The controller features cycleby-cycle current limit to provide constant operation and soft-start capability. If the MAX17127 is in current-limit condition, the step-up converter is latched off after an internal timer expires. A thermal-shutdown circuit provides another level of protection. When thermal shutdown happens, the MAX17127 is latched off. The MAX17127’s step-up controller features an internal 0.12I (typ), 48V (max) power MOSFET with local current-sense amplifier for accurate cycle-by-cycle current limit. This architecture greatly simplifies the external circuitry and saves PCB space. Low-feedback voltage at each LED string helps reduce power loss and improve efficiency. The MAX17127 features resistoradjustable switching frequency from 250k Hz to 1MHz, which enables a wide variety of applications that can trade off ponent size for operating frequency. The MAX17127 is available in a thermally enhanced, lead-free,...