MP3387LGRT-Z

MP3387L The Future of Analog IC Technology Step-up, 6 strings, Max.45mA/string, Combined Analog and PWM dimming, White LED Driver DESCRIPTION FEATURES The MP3387L is a step-up converter with 6channel current sources. It is designed for driving the white LED arrays as backlighting of middle or large size LCD panel. • • • The MP3387L 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 MP3387L independently regulates the current in each LED string to the value set by an external current-setting resistor. • • The MP3387L 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 MP3387L 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, MP3387L automatically transfers the PWM input signal 100Hz to 20kHz frequency to 24kHz to 27.5kHz to eliminate the audible noise. 6-String, Max 45mA/String 3V to 26V Input Voltage Range 3% Current Matching Accuracy Between Strings Programmable Switching Frequency Selectable Combined Analog and PWM Dimming Mode or Pure 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 Programmable Over-Voltage Protection Recoverable Thermal Shutdown Protection Cycle by Cycle Over Current Protection Under-Voltage Lockout TQFN24 (4X4mm) Package • • • • • • • APPLICATIONS • • • • Notebook PC Small LCD TV Handy Terminals Display Automotive System and Tablet Computer All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. MP3387L 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 MP3387L is available 4mmX4mm package. in TQFN24- MP3387L Rev. 1.11 www.MonolithicPower.com 3/29/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 1 MP3387L ― STEP UP, 6STRINGS,WHITE LED DRIVER TYPICAL APPLICATION L1 VOUT VIN C2 C1 GND R1 C3 R2 C4 OVP Mix LED1 AGND PWMI LED2 7 8 LED3 String 6 String 5 String 4 String 3 String 2 18 17 16 String 1 LX LX NC VIN COMP VCC MP3387L NC NC PWM 6 PGND 15 14 13 LED4 5 PGND ISET 4 EN FREQ LED6 LED5 R4 2 3 NC 1 EN 24 23 22 21 20 19 9 10 11 12 R3 MP3387L Rev. 1.11 www.MonolithicPower.com 3/29/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 2 MP3387L ― STEP UP, 6STRINGS,WHITE LED DRIVER ORDERING INFORMATION Part Number* MP3387LGRT Package TQFN-24 (4mmX4mm) Top Marking M3387L * For Tape & Reel, add suffix –Z (e.g. MP3387LGRT–Z); PACKAGE REFERENCE LX LX NC COMP VIN VCC TOP VIEW EN PGND FREQ PGND NC Exposed Pad Connected to GND MIX OVP LED1 LED4 ISET LED5 LED3 LED6 PWMI NC LED2 NC AGND TQFN24 (4X4mm) ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VPWMI, VEN, VIN ...............................-0.3V to +30V VCC .............................................-0.3V to +6.5V VLX, VLED1 to VLED6 ............................-1V to +50V All Other Pins .................................–0.3V to +6V Junction Temperature ...............................150°C Lead Temperature ....................................260°C (2) Continuous Power Dissipation (TA = 25°C) TQFN-24 (4mmX4mm) .............................. 2.9W TQFN-24 (4mmX4mm)…..…..42……..9....°C/W Recommended Operating Conditions (3) Supply Voltage VIN ..............................3V to 26V Operating Junction Temp. ....... -40°C to +125°C (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 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. MP3387L Rev. 1.11 www.MonolithicPower.com 3/29/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 3 MP3387L ― STEP UP, 6STRINGS,WHITE LED DRIVER ELECTRICAL CHARACTERISTICS VIN =12V, VEN = 5V, TA = 25°C, unless otherwise noted. Parameters Symbol Condition Operating Input Voltage VIN Supply Current (Quiescent) IQ VIN=12V, VEN=5V, no load. Supply Current (Shutdown) IST VEN=0V, VIN=12V LDO Output Voltage VCC VCC UVLO Threshold VIN_UVLO Min 3 VEN=5V, 6V