MP3398BGF-Z

MP3398B Step up, 4 strings, Max. 350mA/string Analog and PWM dimming, White LED Controller The Future of Analog IC Technology DESCRIPTION The MP3398B 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 MP3398B uses peak-current mode with fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398B 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 MP3398B 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 MP3398B 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 • • • 4-String, Max 350mA/String WLED Driver 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 Latch-off Over Current Protection Inductor/Diode short Protection Under-Voltage Lockout TSSOP16-EP Package • • • • • • • • • • 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. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. The MP3398B is available in a TSSOP16-EP package. TYPICAL APPLICATION MP3398B Rev. 1.0 www.MonolithicPower.com 8/4/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 STEP UP, 4 STRINGS, MAX. 350MA/STRING ANALOG AND PWM DIMMING, WHITE LED CONTROLLER ORDERING INFORMATION Part Number MP3398BGF* Package TSSOP16-EP Top Marking MP3398B * For Tape & Reel, add suffix –Z (e.g. MP3398BGF–Z); PACKAGE REFERENCE TOP VIEW COMP 1 16 VCC EN 2 15 VIN PWM 3 14 GATE GND 4 13 I SENSE O SC 5 12 OVP ISET 6 11 LED1 ADIM 7 10 LED2 LED4 8 9 LED3 Exposed Pad Connect to GND TSSOP16-EP 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) TSSOP16-EP………………………………2.78W Junction Temperature .............................. 150°C Lead Temperature ................................... 260°C ESD Capability Human Body Mode (all pins) ................................................................. 3.5kV TSSOP16-EP……………………45…….10….°C/W Recommended Operating Conditions (3) (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. Supply Voltage VIN ............................. 5V to 28V LED Current (Backlight) ...........10mA to 350mA Operating Junction Temp. (TJ). -40°C to +125°C MP3398B Rev. 1.0 www.MonolithicPower.com 8/4/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 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 1.35 1,5 mA 3 5.5 mA 0.01 0.5 μA 5.4 6 6.6 V 3.6 4 4.4 V 5 VEN=5V, 7V