R1218N062A-TR-FE

＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218 Series Step-up DC/DC converter for White LED Backlight No. EA-166-180704 OUTLINE The R1218x Series are PWM control type step-up DC/DC converter ICs with low supply current. The R1218x is fully dedicated to drive White LED with constant current. Each of these ICs consists of an NMOS FET, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), an over-voltage protection circuit (OVP). The R1218x can drive white LEDs with high efficiency with low supply current. A diode is built-in the R1218xxx1A, therefore it is possible to drive up to 4LEDs without an external diode. The R1218xxx2A, an external diode is necessary, however, up to 7 serial LEDs can be driven with the R1218xxx2A. Constant current can be set with an external resistance value. Dimming control is possible by PWM signal for CE pin. Feedback voltage is 0.2V, therefore power loss by current setting resistor is small and efficiency is good. Maximum duty cycle is internally fixed, Typ. 91% to 92%. LEDs can be driven from low voltage. Protection circuits are the current limit of Lx peak current, the over voltage limit of output, and the under voltage lockout function. Packages are standard SOT-23-6 and very tiny DFN(PLP)1820-6. FEATURES • • • • • • • • • Input voltage.................................................. 1.8V to 5.5V Built-in 400mA, 1.5Ω, 20V Nch MOSFET and diode (R1218xxx1A) Built-in 400mA, 1.5Ω, 33V Nch MOSFET (R1218xxx2A) Oscillator Frequency (PWM control) ............. 1.2MHz Maximum Duty Cycle .................................... Typ. 91% to 92% Feedback Voltage ......................................... Typ. 0.2V UVLO Threshold Voltage .............................. Typ. 1.6V (Hysteresis Typ. 0.1V) Lx Current limit Protection............................. Typ. 700mA Over Voltage Protection (OVP) Threshold .... Typ. 9.5V (R1218x021A) Typ. 14.0V (R1218x031A) Typ. 18.5V (R1218x041A) Typ. 23.0V (R1218x052A) Typ. 27.5V (R1218x062A) Typ. 31.5V (R1218x072A) • LED dimming control ..................................... by external PWM signal (Frequency 200Hz to 5kHz) to CE pin by feedback voltage and filtered PWM signal (high frequency) • Packages ...................................................... DFN(PLP)1820-6, SOT-23-6 APPLICATIONS • White LED Backlight for portable equipment 1 ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 SELECTION GUIDE The OVP threshold, the built-in diode, and the package for the ICs can be selected at the user’s request. Selection Guide Product Name R1218Kxxxx-TR R1218Nxxxx-TR-FE Package Quantity per Reel Pb Free Halogen Free DFN(PLP)1820-6 5,000 pcs Yes Yes SOT-23-6 3,000 pcs Yes Yes xx xx: The combination of the OVP threshold and with/without of built-in diode can be designated. 2 Code OVP Threshold Built-in Diode 021A 9.5 V Yes 031A 14.0 V Yes 041A 18.5 V Yes 052A 23.0 V No 062A 27.5 V No 072A 31.5 V No ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 BLOCK DIAGRAMS R1218xxx1A VFB VIN Error Amp LX VOUT UVLO PWM Comp R Switch Control Q S OVP Vref OSC Slope Compensation Current Protect Current sense Σ Shutdown delay Chip Enable CE GND R1218xxx2A VFB VIN Error Amp LX VOUT UVLO PWM Comp R Q S Switch Control OVP Vref OSC Slope Compensation Current Protect Current sense Σ Shutdown delay Chip Enable CE 3 GND ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 PIN DESCRIPTIONS Bottom View Top View 6 5 4 4 5 6 6 5 4 (1) (mark side) 1 2 3 3 2 1 1 DFN(PLP)1820-6 Pin Configuration DFN(PLP)1820-6 Pin Description Pin No Symbol 3 SOT-23-6 Pin Configuration Pin Description 1 CE Chip Enable Pin ("H" Active) 2 VFB Feedback Pin 3 Lx Switching Pin (Open Drain Output) 4 GND 5 VIN 6 VOUT Ground Pin Power Supply Input Pin Output Pin SOT-23-6 Pin Description Pin No Symbol (1) Tab 2 1 Pin Description 1 CE Chip Enable Pin ("H" Active) 2 VOUT 3 VIN Power Supply Input Pin 4 Lx Switching Pin (Open Drain Output) 5 GND 6 VFB Output Pin Ground Pin Feedback Pin is GND level (They are connected to the reverse side of this IC). The tab is better to be connected to the GND, but leaving it open is also acceptable. 4 ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings Symbol (GND = 0 V) Item Rating Unit VIN VIN Pin Voltage 6.5 V VCE CE Pin Voltage −0.3 to VIN + 0.3 V VFB VFB Pin Voltage −0.3 to VIN + 0.3 V VOUT VOUT Pin Voltage VLX LX Pin Voltage ILX LX Pin Current Power −0.3 to 22 R1218xxx2A −0.3 to 34 R1218xxx1A −0.3 to 22 R1218xxx2A −0.3 to 34 1000 DFN(PLP)1820-6 PD R1218xxx1A Dissipation(1) SOT-23-6 JEDEC STD. 51-7 Test Land Pattern JEDEC STD. 51-7 Test Land Pattern V V mA 2200 mW 660 Tj Junction Temperature Range −40 to 125 °C Tstg Storage Temperature Range −55 to 125 °C ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITIONS Recommended Operating Conditions Symbol Item Rating Unit VIN Operating Input Voltage 1.8 to 5.5 V Ta Operating Temperature Range −40 to 85 °C RECOMMENDED OPERATING CONDITIONS All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. (1) 5 Refer to POWEWR DISSIPATION for detailed information. ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 ELECTRICAL CHARACTERISTICS R1218xxxxA Electrical Characteristics Symbol Item IDD Supply Current Istandby Standby Current (Ta = 25°C) Conditions Min. Typ. Max. Unit VIN = 5.5 V, VFB = 0 V, Lx at no load 0.5 1.0 mA VIN = 5.5 V, VCE = 0 V 0 3.0 µA 1.6 1.7 V VUVLO1 + 0.1 1.8 V VUVLO1 UVLO Detector Threshold VIN falling VUVLO2 UVLO Released Voltage VIN rising VCEH CE Input Voltage "H" VIN = 5.5 V VCEL CE Input Voltage "L" VIN = 1.8 V RCE CE Pull Down Resistance VIN = 3.6 V CE Shutdown Delay Time VIN = 3.6 V VFB Voltage VIN = 3.6 V VFB Voltage Temperature Coefficient VIN = 3.6 V, −40°C ≤ Ta ≤ 85°C IFB VFB Input Current VIN = 5.5 V, VFB = 0 V or 5.5 V RON Switch On Resistance VIN = 3.6 V, ISW = 100 mA ILXleak Switch Leakage Current ILXlim Switch Current Limit Vf Diode Forward Voltage R1218xxx1A IDIODE = 100 mA 0.8 V IDIODEleak Diode Leakage Current R1218xxx1A VOUT = 20 V, VLX = 0 V 10 µA tshtdn VFB ∆VFB/∆Ta fosc Oscillator Frequency Maxduty Maximum Duty Cycle VOVP1 VOVP2 6 OVP Detector Threshold OVP Released Voltage 1.5 1.5 600 V 1200 0.5 V 2200 kΩ 10 0.19 0.20 ms 0.21 ppm /°C ±150 −0.1 V 0.1 µA Ω 1.5 R1218xxx1A VLX = 20 V 0 3.0 µA R1218xxx2A VLX = 33 V 0 3.0 µA 700 1000 mA VIN = 3.6 V 400 VIN = 3.6V, VOUT = VFB = 0V 1.0 1.2 R1218x072A VIN = 3.6V, VOUT = VFB = 0 V Others 86 92 86 91 R1218x021A 8.5 9.5 10.5 R1218x031A 13.0 14.0 15.0 R1218x041A 17.0 18.5 20.0 R1218x052A 21.5 23.0 24.5 R1218x062A 26.0 27.5 29.0 R1218x072A 30.0 31.5 33.0 VIN = 3.6V, VOUT rising VIN = 3.6V, VOUT falling R1218x021A VOVP1 - 0.5 R1218x031A VOVP1 - 0.75 R1218x041A VOVP1 - 1.0 R1218x052A VOVP1 - 1.25 R1218x062A VOVP1 - 1.5 R1218x072A VOVP1 - 1.75 1.4 MHz % V V ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 APPLICATION INFORMATION • Typical Application Circuit L1 22µH L1 22µH C1 1µF C2 0.22µF VIN C1 1µF C2 0.22µF LX VIN CE LX VOUT CE GND VFB R1 10Ω GND R1218x041A • VOUT VFB R1 10Ω R1218x072A Selection of Inductors The peak current of the inductor at normal mode can be estimated as the next formula when the efficiency is 80%. ILmax = 1.25 x IOUT x VOUT / VIN + 0.5 x VIN x (VOUT - VIN) / (Lx VOUT x fosc) When the start-up or dimming control by CE pin, transient current flows, the peak current must be equal or less than the current limit of the IC. The peak current should not beyond the rating current of the inductor. The recommended inductance value is 10 µH -22 µH. Table 1 Peak current value in each condition VIN (V) 3 3 3 3 L (µH) 10 10 10 10 22 22 22 7 Condition VOUT (V) IOUT (mA) 14 20 14 20 21 20 21 20 L (µH) 10 22 10 22 Table 2 Recommended inductors Rated Part No. Current (mA) LQH32CN100K53 450 LQH2MC100K02 225 VLF3010A-100 490 VLS252010-100 520 LQH32CN220K53 250 LQH2MC220K02 185 VLF3010A-220 330 ILmax (mA) 215 160 280 225 Size (mm) 3.2 x 2.5 x 1.55 2.0 x 1.6 x 0.9 2.8 x 2.6 x 0.9 2.5 x 2.0 x 1.0 3.2 x 2.5 x 1.55 2.0 x 1.6 x 0.9 2.8 x 2.6 x 0.9 ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 • Selection of Capacitors Set 1 µF or more value bypass capacitor C1 between VIN pin and GND pin as close as possible. Set 0.22 µF or more capacitor C2 between VOUT and GND pin. Note the VOUT that depends on LED used, and select the rating of VOUT or more. • Selection of SBD (Schottky Barrier Diode ) Select the diode with low VF such as Schottky type with low reverse current IR, and with low capacitance. Table 3 Recommended components Rated voltage (V) Part No. 6.3 25 50 30 30 CM105B105K06 GRM21BR11E224 GRM21BR71H224 CRS10I30A RSX051VA-30 C1 C2 D1 • LED Current setting LED current can be set with feedback resistor (R1) ILED = 0.2 / R1 • LED Dimming Control, Softstart (1) LED dimming control by PWM signal to CE pin LED dimming control is possible by forcing PWM signal to CE pin. When the power-on or start up with CE pin, softstart function works, however, after that, if the CE pin is set as "L" and set CE pin "H" again during the shutdown delay time, softstart function is disabled and starts up fast to normal mode, therefore 200 Hz to 5 kHz PWM signal is standard. By the CE pin input, LED turns on and off. Average LED current varies depending on the duty cycle of CE input. Too high frequency PWM signal is not effective because of its delay. CE VFB R1 Dimming control by CE pin input 8 ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 (2) Dimming control by DC voltage LED dimming control is also possible by using the DC voltage to VFB pin. LED current is adjustable by DC voltage and resistors, R1 and R2 in the following figure. ILED = 0.2/R1 - (DC - 0.2)/R2 R2 VFB DC R1 Dimming control by DC voltage (3) Dimming control by feedback voltage and filtered PWM signal LED dimming control is also possible by using the feedback voltage and filtered PWM signal. LED current is adjustable according to the "H" level (VH) and "L" level (VL) of PWM signal and resistors, R1, R2, R3, and R4 in the following figure. R2 VFB R3 C3 R4 R1 VH VL Dimming control by filtered PWM signal Duty = 0% to 100% PWM signal duty cycle can be used up to the maximum LED current and minimum LED current as in the next formulas. ILEDMIN = {0.2 - R2 x (VH - 0.2) / (R3 + R4)} / R1 ILEDMAX = {0.2 - R2 x (VL - 0.2) / (R3 + R4)} / R1 For example, supposed that the PWM signal level is set as 2.5 V/0 V, to adjust the LED current range from 0 mA to 20 mA by the duty cycle, our recommendation external components values are, R1 = 10 Ω, R2 = 5.1 kΩ, R3 = 51 kΩ, R4 = 5.1 kΩ or around. C3 should be set large enough to regard the PWM signal as adjustable DC voltage by the filter. In this method, higher frequency control than the frequency against the CE pin can be used for dimming control. For example, if the frequency is 40 kHz, 0.1 µF or more capacitor is our recommendation value as C3. 9 ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 TECHNICAL NOTES ●Current path on PCB The current paths in an application circuit are shown in Fig. 1 and 2. A current flows through the paths shown in Fig. 1 at the time of MOSFET-ON, and shown in Fig. 2 at the time of MOSFET-OFF. In the paths pointed with red arrows in Fig. 2, current flows just in MOSFET-ON period or just in MOSFET-OFF period. Parasitic impedance/inductance and the capacitance of these paths influence stability of the system and cause noise outbreak. So please minimize this side effect. In addition, please shorten the wiring of other current paths shown in Fig. 1 and 2 except for the paths of LED load. ●Layout Guide for PCB ⋅ Please shorten the wiring of the input capacitor (C1) between VIN pin and GND pin of IC. The GND pin should be connected to the strong GND plane. ⋅ The area of LX land pattern should be smaller. ⋅ In the case of internal diode version, please put output capacitor (C2) close to the VOUT pin. ⋅ ⋅ In the case of external diode, the wiring between LX pin and inductor and diode should be short and please put output capacitor(C2) close to the cathode of diode. Please make the GND side of output capacitor (C2) close to the GND pin of IC. 10 MOSFET-ON Load Load Fig. 1 Fig. 2 MOSFET-OFF ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 ●PCB Layout ・PKG: DFN(PLP)1820-6 pin R1218Kxx1A Topside Backside Topside Backside R1218Kxx2A 11 ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 ・PKG: SOT-23-6 pin R1218Nxx1A/xx2A Top Layer (1) (1) U1-● indicates the position of No.1 pin. 12 Back Layer ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 TYPICAL CHARACTERISTICS 1) Efficiency vs. LED Current (2 LED) L: LQH32CN220 (Ta = 25°C) R1218x021A R1218x021A R1218x021A 2) Efficiency vs. LED Current (3 LED) L: LQH32CN220 (Ta = 25°C) R1218x031A 13 R1218x031A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 R1218x031A 3) Efficiency vs. LED Current (4 LED) L: LQH32CN220 (Ta = 25°C) R1218x041A R1218x041A 14 R1218x041A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 4) Efficiency vs. LED Current (6 LED) L: LQH32CN220, Diode: CRS02 (Ta = 25°C) R1218x062A R1218x062A R1218x062A 5) Efficiency vs. LED Current (7 LED) L: LQH32CN220, Diode: CRS02 (Ta = 25°C) R1218x072A 15 R1218x072A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 R1218x072A 6) PWM Dimming Control (2 LED) VIN = 3.6 V, R1 = 10 Ω 6-1. Duty vs. LED Current (2 LED) (Ta = 25°C) R1218x021A 6-2. Output Voltage Waveform (2 LED) (Ta = 25°C) R1218x021A 16 R1218x021A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 7) PWM Dimming Control (4 LED) VIN = 3.6 V, R1 = 10 Ω 7-1. Duty vs. LED Current (4 LED) (Ta = 25°C) R1218x041A 7-2. Output Voltage Waveform (4 LED) (Ta = 25°C) R1218x041A 8) PWM Dimming Control (6 LED) VIN = 3.6 V, R1 = 10 Ω 8-1. Duty vs. LED Current (6 LED) (Ta = 25°C) R1218x062A 17 R1218x041A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 8-2. Output Voltage Waveform (6 LED) (Ta = 25°C) R1218x062A R1218x062A 9) PWM Dimming Control (7 LED) VIN = 3.6 V, R1 = 10 Ω 9-1. Duty vs. LED Current (7 LED) (Ta = 25°C) R1218x072A 9-2. Output Voltage Waveform (7 LED) (Ta = 25°C) R1218x072A 18 R1218x072A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 10) VFB Voltage vs. Temperature R1218x041A 12) Oscillator Frequency vs. Temperature R1218x041A 14) OVP Detector Threshold/Released Voltage vs. Temperature R1218x041A 19 11) UVLO Detector Threshold/Released Voltage vs. Temperature R1218x041A 13) Maximum duty cycle vs. Temperature R1218x041A 15) Supply Current vs. Temperature R1218x041A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 16) LX Current Limit vs. Temperature Lx Current Limit Ilim (mA) R1218x041A 2.4 12003.6 5.5 514 860 1080 460 675 810 400 515 595 VIN＝1.8V VIN＝2.4V VIN＝3.6V VIN＝5.5V 1000 800 600 400 200 0 -40 -15 10 35 60 85 Temparature　Topt (℃) 17) OVP Transient Response (Ta = 25°C) R1218x021A R1218x062A 20 R1218x041A ＊R1218K(DFN(PLP)1820-6) is the limited product as of March 2020. R1218x No. EA-166-180704 18) Efficiency dependence on inductors (4 LED) R1218x041A (Internal Diode Type) 21 1. 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