MP3398LGS-Z

MP3398L Step up, 4 strings, Max. 350mA/string Analog and PWM dimming, White LED Controller DESCRIPTION FEATURES The MP3398L 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.    4-String, Max 350mA/String WLED Driver 4.5V to 28V Input Voltage Range 2.5% Current Matching Accuracy Between Strings Programmable Switching Frequency PWM and Analog Dimming Mode Cascading Capability with a Single Power Source LED Open and Short LED Protection Programmable Over-Voltage Protection Recoverable Thermal Shutdown Protection Over Current Protection Inductor/Diode short Protection Under-Voltage Lockout SOIC16 Package    The MP3398L uses peak-current mode with fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398L 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 MP3398L 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. APPLICATIONS    Desktop LCD Flat Panel Displays Flat Panel Video Displays 2D/3D LCD TVs and Monitors All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. The MP3398L 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. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. The MP3398L is available in SOIC16 package. TYPICAL APPLICATION L1 VOUT D1 VIN C2 C1 GND R1 R4 2 C4 5 7 R5 ISENSE GND COMP EN MP3398L OVP OSC LED1 ADIM LED2 PWM LED3 ISET LED4 3 6 13 R2 4 12 11 String 4 VCC 1 String 3 16 GATE 14 String 2 VIN String 1 15 C3 10 9 8 R3 MP3398L Rev. 1.0 9/9/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 STEP UP, 4 STRINGS, MAX. 350MA/STRING ANALOG AND PWM DIMMING, WHITE LED CONTROLLER ORDERING INFORMATION Part Number MP3398LGS* Package SOIC16 Top Marking MP3398L * For Tape & Reel, add suffix –Z (e.g. MP3398LGS–Z); PACKAGE REFERENCE TOP VIEW COMP 1 16 VCC 2 15 VIN PWM 3 14 GATE GND 4 13 ISENSE OSC 5 12 OVP ISET 6 11 LED1 ADIM 7 10 LED2 8 9 LED3 EN LED4 SOIC16 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN .............................................. -0.3V to +30V VGATE ........................................... -0.3V to +6.5V VCC ............................................ -0.3V to +6.5V VLED1 to VLED4 .................................. -1V to +55V VISENSE ......................................... -0.5V to +6.5V All Other Pins ............................... –0.3V to VCC (2) Continuous Power Dissipation (TA = 25°C) SOIC16 .................................................... 1.56W Junction Temperature .............................. 150°C Lead Temperature ................................... 260°C SOIC16……………………………80……35....°C/W Recommended Operating Conditions (3) Supply Voltage VIN .......................... 4.5V to 28V LED Current (Backlight) ...........10mA to 350mA Operating Junction Temp. (TJ). -40°C to +125°C MP3398L Rev. 1.0 9/9/2013 (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. The voltage is measured with a 20MHz bandwidth limited oscilloscope. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 STEP UP, 4 STRINGS, MAX. 350MA/STRING ANALOG AND PWM DIMMING, WHITE LED CONTROLLER ELECTRICAL CHARACTERISTICS (5) VIN =12V, VEN = 5V, TA = 25°C, unless otherwise noted. Parameters Symbol Condition Operating Input Voltage VIN Supply Current (Quiescent) IQ Supply Current (Operation) IOP VIN=12V, VEN=5V, no load without switching VIN=12V, VEN=5V, no load with switching Supply Current (Shutdown) IST VEN=0V, VIN=12V LDO Output Voltage VCC VCC UVLO Threshold VIN_UVLO Min Max Units 28 V 1.25 1,5 mA 2.6 5 mA 0.01 0.5 μA 3.5 5 5.5 V 3 3.4 3.8 V 4.5 VEN=5V, 7V