Part Number: MP3398
Function: Step-up, White LED Controller
Package: SOIC 16, TSSOP 16, SOIC 20 Pin type
Manufacturer: MPS
Images:
Description
The MP3398 is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications. It is flexible to expand the number of LED channels by two or more ICs in parallel sharing a single inductive power source. The MP3398 uses peak-current mode with fixed switching frequency. The frequency is programmable by an external setting resistor.
The MP3398 drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. It regulates the current in each LED string to the value set by an external current-setting resistor. The device applies 4 internal current sources for current balance. The current matching can achieve 2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss. The IC can support both analog and PWM dimming independently to meet the different dimming-mode request. In addition, rich protection modes are also integrated including OCP, OTP, UVP, OVP, LED short/open protection, inductor/diode short protection.
Features
1. 4-String, Max 400mA/String WLED Driver
2. 4.5V to 33V Input Voltage Range
3. 80V ABS Rating for Each String
4. 2.3% Current Matching Accuracy between Each String
5. Direct PWM Dimming Mode
6. Analog Dimming Mode with PWM Input
7. Cascading Capability with a Single Power Source
8. LED Open and Short Protection
9. Programmable Recoverable Over-Voltage Protection (OVP)
10. 202mV Latch-Off Cycle-by-Cycle Current Limit Threshold
11. Latch-Off Over-Temperature Protection (OTP)
12. Short Inductor/Diode Protection
Application Circuits:
Applications:
1. Desktop LCD Flat Panel Displays
2. All-in-One PCs
3. 2D/3D LCD TVs
MP3398 PDF Datasheet
