The MP3387AGRT-Z is a step-up converter with 6-channel current sources. It is designed for driving the white LED arrays as backlighting of middle or large size LCD panel.The MP3387AGRT-Z uses peak-current mode as its PWM control architecture. The switching frequency can be programmed by a resistor. It generates an output voltage up to 45V from a 3V to 26V input supply. The MP3387AGRT-Z independently regulates the current in each LED string to the value set by an external current-setting resistor.The MP3387AGRT-Z applies 6 internal current sources in each LED string terminal to achieve a current balance with 3% current regulation accuracy between strings. Its low 500mV regulation voltage on LED current sources reduces power loss.The MP3387AGRT-Z features external digital PWM dimming and analog dimming, both of which sharing a single input with 25% PWM duty cycle as a transfer point. The mix-dimming strategy helps to improve the dimming ratio. Also, MP3387AGRT-Z automatically transfers the PWM input signal 100Hz to 20kHz frequency to 24kHz to 27.5kHz to eliminate the audible noise.MP3387AGRT-Z has rich protection modes to guarantee safety operation. The protection modes include recoverable OCP (over-current protection), OVP (over-voltage protection), OTP (over-temperature protection), any string of LED short and open protection.The MP3387AGRT-Z is available in TQFN24-4mmX4mm package. 9icnet Electronics is an authorized Monolithic Power Systems distributor.
Feature
- 6-String, Max 80mA/String
- 3V to 26V Input Voltage Range
- 1.5% Current Matching Accuracy between Strings
- Programmable Switching Frequency
- Selectable Combined Analog and PWM Dimming Mode or Direct PWM Dimming Mode
- Combined Analog and PWM Dimming Mode with 25% Dimming Transfer Point
- 24kHz to 27.5kHz Output Dimming Frequency to Eliminate Audible Noise
- Cascading Capability with a Single Power Source
- Programmable Over-Voltage Protection (OVP)
- Recoverable Thermal Shutdown Protection
- Cycle-by-Cycle Over-Current Protection (OCP)
- Under-Voltage Lockout (UVLO)
- Available in a TQFN-24 (4mmx4mm) Package
