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Technical content
Features
Wide VIN Range: 2.5V to 5.5V 640kHz/1.2MHz Current-Mode Boost Regulator Fast Transient Response to Pulsed Load Adjustable Output Voltage (±1%) Built-In 16V, 2A, 0.2Ω N-MOSFET High Efficiency Up to 90% Programmable Soft-Start Low Dropout Voltage Linear Regulator Maximum Output Current : 350mA Adjustable Output Voltage : 1.5V to VIN − 0.5V( ±1.5%) GPM Controller with Adjustable Power-On Sequence Control Power-On Delay and Falling Time Flicker Compensator Low Voltage Detector Programmable Detecting Voltage (±2%) Programmable Delay Time Unity-Gain Operation Amplifier for VCOM Buffer Charge Pump for VGH regulation Under-Voltage Protection Over-Temperature Protection Available in QFN-24 (4×4mm) RoHS Compliant and Halogen Free Pb-Free Package
Applications
TFT LCD TV TFT LCD Monitor Marking Information Device Marking Package Shipping LP6284 LPS LP6284 YWX QFN-24 3K/REEL Y: Y is year code. W: W is week code. X: X is series number.
Figure 3. Function Block Diagram
Preliminary Datasheet LP6284 Functional Pin Description Pin NO. Pin Name Description 1 LX Boost Regulator Switching Node. Connect the inductor and the schottky diode to LX. 2 VIN Supply Input. The input voltage range is between 2.5V to 5.5V. Connect a ceramic capacitor between VIN and GND. 3 SS Soft-Start Control Pin. Connect a soft-start capacitor to this pin. 4 AGND Analog GND. 5 LDOF Linear Regulator Feedback Input. Connect to an external resistive voltage divider from the LDOO to GND to set the output voltage. 6 LDOO Linear Regulator Output. Bypass LDOO to GND with a capacitor. 7 LDOI Linear Regulator Power Source. Bypass LDOI to GND a capacitor. 8 VDET Voltage Detector Input. Connect to an external resistive voltage divider from the VIN to AGND. 9 𝐑𝐑𝐑𝐑𝐑𝐑 Voltage Detector Output for Reset. Active Low 10 DLY Reset Delay Time. Connect a capacitor between DLY and GND. 11 HVDP High-Voltage Switch Delay Input. Connect a capacitor from HVDP to GND to set the delay time. 12 VFLK VFLK is produced by timing controller for charging or discharging VGHM. 13 DRN GPM Discharge Pin. 14 VGHM GPM Output. 15 VGH GPM Input. 16 FBP VGH Charge-Pump Regulator Feedback Input. Connect to an external resistive voltage divider from the VGH to GND to set the output vol tage. 17 DRVP VGH Charge-Pump Regulator Driver Output. 18 AVDD VDD for Source Driver Power. This also supplies the GPM/OPA/Step-up Controller block. 19 OPO Unity-Gain operation amplifier output pin. 20 OPI Unity-Gain operation amplifier input Pin. 21 COMP Boost Regulator Error Amplifier Compensation Pin. 22 FB Boost Regulator Feedback Input. Connect to an external resistive voltage divider from the output to FB to set the output voltage. 23 FSEL Frequency Select Pin. Set FSEL to high for 1.2MHz operation. Set this pin to low for 640kHz operation. 24 PGND Power Ground.
Preliminary Datasheet LP6284 Absolute Maximum Ratings Note 1 Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Thermal Information Thermal Resistance ESD Susceptibility Note 2. The Human body model (HBM) is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The testing is done according JEDEC. Note 3. Machine Model (MM) is a 200pF capacitor discharged through a 500nH inductor with no series resistor into each pin. The testing is done according JEDEC.
Preliminary Datasheet LP6284
Electrical Characteristics
(VIN =3.3V, VAVDD =10V, TA=25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units General VIN Input Supply Voltage VIN 2.5 5.5 V VIN Supply Current IQ VFB=1.3V, LX no Switching 0.5 1 mA VFB=1.1V, LX Switching 2 4 mA Shutdown Current ISD 1 5 uA Input UVLO Threshold VUVLO(VTH) VIN Rising 1.8 2 2.2 V UVLO Threshold Hysteresis VUVLO(HYS) Falling Hysteresis 100 mV Frequency Selection Levels FOSC FSEL=Low 1.5 V FSEL=High 0.6 V FSEL Pull Down Current IFSEL VFSEL=1V 4 uA Thermal Shutdown Threshold TSD 160 °C Thermal Shutdown Hysteresis 30 °C Boost Regulator Switching Frequenc y FSW FSEL = GND -- 640 -- kHz FSEL = VIN 1000 1200 1500 Maximum Duty-Cycle DMAX 86 90 94 % Feedback Voltage VFB 1.228 1.24 1.252 V Line Regulation VIN=2.5V to 5.5V -0.1 %/V Switch-ON Resistance RDS(ON) 200 500 mΩ Current Limit ILimit 2 A Soft Start Current ISS 4 uA FB Fault Protection Voltage VUVP VFB Falling 1.05 V FB Fault Delay TUVP 160 ms Voltage Detector Minimum Operating Voltage VDV 1.6 V Detecting Voltage Adjustment VDet 1.08 1.1 1.12 V 𝐑𝐑𝐑𝐑𝐑𝐑 Pull Low Resistance RRST VRST=0.2V, IRST=1.2mA 1.7 kΩ DLY Source Current IDLY VDLY=1V 5 10 15 uA DLY Threshold Voltage VDLY 1.2 1.24 1.28 V
Preliminary Datasheet LP6284 Electrical Characteristics (Continued) (VIN =3.3V, VAVDD =10V, TA=25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units Low Dropout Linear Regulator LDO Supply Voltage VLDO 2.5 5.5 V LDO Supply Current IQ_LDO 90 uA Dropout Voltage VDrop VIN= 3.3V, IOUT = 350mA 450 500 mV LDO Feedback Voltage VLDOF 1.224 1.24 1.256 V Current Limit ILimit 350 400 mA Line Regulation VIN=2.5V to 5.5V, I OUT=0.1A, VLDO=2.5V 0.1 0.3 %/V Load Regulation IOUT=1mA to 300mA 0.2 0.5 % Gate Pulse Modulator VFLK Input High Voltage VH_FLK 1.5 V VFLK Input High Voltage VL_FLK 0.8 V HVDP Charge Current IHVDP 20 uA VGH Switch ON Resistance RDS_GH 20 Ω DRN Switch ON Resistor RDS_DRN 25 Ω Positive Charge Pump Feedback Voltage VFBP No Load 1.216 1.24 1.264 V FBP Input Bias Current IB VFBP=1.5V -50 +50 nA DRVP Switch ON Resistance RDS_P 20 Ω RDS_N 20 Ω Switch Frequency FSW_DRVP FOSC /2 Hz Continuous Output Current IDRVP 20 mA Unity-Gain Operation Amplifier OPA Supply Current IOP 0.5 0.9 mA Input Offset Voltage VOS VOPO=VAVDD/2 -17 +17 mV OPI Input Bias Current IOP_B 1 50 nA Output Voltage Swing High VOH ILoad = 75mA VAVDD- 1.5 V Output Voltage Swing Low VOL ILoad = -75mA 1.5 Short Circuit Current VOP_Short VOPI= VAVDD/2 ±180 mA -3dB Bandwidth F3dB 12 MHz Gain Bandwidth GBW 8 MHz Slew Rate SR 12 V/us
Figure 4. Power Sequence and GPM Function
Preliminary Datasheet LP6284 Outline Information LPS LP6284 YWX D E A SYMBOLS UNIT DIMENSION IN MILLIMETER MIN MAX A 0.800 1.000 A1 0.000 0.050 A3 0.175 0.250 b 0.180 0.300 D 3.950 4.050 D2 2.300 2.750 E 3.950 4.050 E2 2.300 2.750 L 0.350 0.450 e 0.5