Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Package General Descriptions Exposed SOIC 8 Thermally enhanced 8-Pin package The NR110E series is buck regulator ICs integrates High-side power MOSFET. The feature increasing efficiency at light loads allows the device to be used in the energy-saving applications. With the current mode control, ultra low ESR capacitors such as ceramic capacitors can be used. The ICs have protection functions such as Over-Current Protection (OCP), Under-Voltage Lockout (UVLO) and Thermal Shutdown (TSD). An adjustable Soft-Start by an external capacitor prevents the excessive inrush current at turn-on. The ICs integrate phase compensation circuit which reduces the number of external components and simplifies the design of customer application. The ON/OFF pin (EN Pin) turns the regulator on or off and helps to achieve low power consumption requirements. The NR110E series is available in an 8-pin SOIC package with an exposed thermal pad on the back side. Features & Benefits Electrical Characteristics Current mode PWM control Up to 94% Efficiency, Up to 68% Efficiency at IO = 20mA Light Load Adjustable “Over Current Protection（OCP）” Current mode PWM control Stable with low ESR ceramic output capacitors Built-in protection function Over Current Protection (OCP) Thermal Shutdown (TSD) Under Voltage Lockout (UVLO) Built-in phase compensation Adjustable Soft-Start with an external capacitor Turn ON/OF the regulator function Operating input range VIN = 6.5V～31V Output adjustable VO= 0.8V～24V 2A / 4A output current Fixed 350kHz frequency Applications LCD TV / Blu-Ray / Set top box Home appliance Green Electronic products Other power supply Typical Application Circuit VIN R3 VIN_s 2 IN R1 7 C2 EN C1 C10 SW 3 SS GND 4 Vo L1 Vo_s NR111E 8 GND 1 BS R5 FB ISET 6 C4 C5 5 R4 GND C9 R6 R7 D1 SW C1, C2: 10μF / 35V C4, C5: 22μF / 16V C9: 0.1μF C10: 0.1μF Rev.1.0 R1: 1.7MΩ L1: 10μH R3: 22Ω R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V) R6: 3.9kΩ SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 1 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Series Lineup Product No. fSW VIN NR111E 350kHz VO (1) 6.5V to 31V 0.8V to 24V IO 4A (2) NR119E 364kHz The minimum input voltage shall be either of 6.5V or VO+3V, whichever is higher. (2) The I/O condition limited by the Minimum on-time (TON(MIN)). 2A (1) Absolute Maximum Ratings Parameter Symbol Ratings Units DC input voltage VIN 35 V BS Pin voltage VBS 44 V VBS-SW 8 V SW Pin voltage VSW 35 V FB Pin voltage VFB 5.5 V EN Pin voltage VEN 35 V SS Pin voltage VSS 5.5 V BS-SW Pin voltage Power dissipation (3) PD 1.76 W Junction temperature (4) TJ 40 to 150 °C Glass-epoxy board mounting in a 30×30mm. (copper area in a 25×25mm) Max TJ =150°C Storage temperature Thermal resistance (junction- Pin No. 4) TS 40 to 150 °C θJP 26 °C /W Thermal resistance (junction-ambient air) θJA 71 °C /W (3) (4) Conditions Glass-epoxy board mounting in a 30×30mm. (copper area in a 25×25mm) Limited by thermal shutdown. The temperature detection of thermal shutdown is about 160°C Recommended Operating Conditions Parameter Symbol (5) DC input voltage DC output current Output voltage NR111E NR119E VIN (6) (7) Io Vo Ratings MIN MAX 6.5 31 0 4.0 0 2.0 0.8 24 Units Conditions V A V (7) Ambient operating temperature Top 85 °C 40 The minimum value of input voltage is taken as the larger one of either 6.5V or VO +3V. (6) Recommended circuit refers to Typical Application Circuit. (7) To be used within the allowable package power dissipation characteristics. (5) Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 2 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Electrical Characteristics Ta = 25°C Parameter Symbol Reference voltage Output voltage temperature coefficient Switching frequency NR111E MIN TYP MAX VREF 0.784 0.800 0.816 ⊿VREF/⊿T ― ±0.05 ― 280 350 420 291 364 437 fSW NR119E Ratings Units Test conditions V VIN = 12V，IO = 1.0A V = 12V, IO = 1.0A mV/°C IN 40°C to +85°C kHz VIN=12V, VO=5.0V, IO=1A VIN=8V～31V, VO =5.0V, IO=1A VIN=12V, VO=5.0V, IO=0.1A～2.0A VIN =12V, VO =5.0V ISET=OPEN VIN =12V, VO =5.0V ISET=SHORT VIN=12V, VO =5.0V ISET=OPEN VIN =12V, VO =5.0V ISET=SHORT VIN = 12V VEN=10kΩ pull up to VIN VIN =12V, IO =0A, VEN=0V Line regulation (8) VLine ― 50 ― mV Load regulation (8) VLoad ― 50 ― mV IS1 ― 1.5 ― IS2 ― 5.5 ― IS1 ― 0.9 ― IS2 ― 2.8 ― IIN ― 1 ― mA IIN(off) 0 1 ― μA IEN/SS 6 10 14 μA VSS=0V, VIN =12V 20 50 μA VEN= 10V 1.4 2.1 V VIN =12V V VIN =12V NR111E Over current protection starting current A NR119E Supply Current Shutdown Supply Current SS Pin EN Pin ISET Pin Source current at low level voltage Sink current Threshold voltage VC/EH Open voltage VISET Max on-duty Minimum on-time NR111E NR119E Thermal shutdown threshold temperature Thermal shutdown restart hysteresis of temperature (8) Guaranteed by design, not tested. Rev.1.0 IEN (8) DMAX (8) TON(MIN) 0.7 1.5 ― 90 ― ― 150 ― ― 150 ― % nsec (8) TSD 151 165 ― °C (8) TSD_hys ― 20 ― °C SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 3 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Typical Performance Characteristics NR111E Typical Performance Characteristics Efficiency VO=3.3V 100 Efficiency η [%] 90 80 70 VIN=12V 15V 18V 20V 24V 60 50 40 0.01 0.1 1 10 Output Current IO [A] VO=5.0V 100 Efficiency η [%] 90 80 VIN=12V 15V 18V 20V 24V 70 60 50 40 0.01 0.1 1 10 Output Current IO [A] Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 4 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 NR111E Typical Performance Characteristics Output startup NR114K UVLO OCP. OverNR110K/111K Current Protection Vo=5.0V L=10uH V =5.0V 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Output Voltage Vo [V] VO [V] VO[V] Voltage [V] Output VO=5.0V,Vo=3.3V Load =L=47uH Constant Resistance O 6.00 5.50 5.00 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 VIN=12V 15V 18V 20V 24V 0.0 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 1.0 2.0 fosc [kHz] 1.0 1.5 2.0 2.5 3.0 0.0 8.0 9.0 1.0 2.0 3.0 4.0 5.0 Supply Current : IIN NR114K/115K,NR116K,NR117K IQ IQ_off VEN =0V VO=5.0V 5.0 0.35 Iin [mA] Current [mA] Supply Current ShutdownIinSupply [mA] [mA] 7.0 Output IoCurrent IO [A] [A] Shutdown Supply Current : I NR110K,111K,114K,115K,116K,117KIN(off) 0.30 0.25 0.20 0.15 0.10 0.05 0.00 -0.05 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 -0.10 0.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 0.0 5.0 VIN[V]VIN [V] Input Voltage Rev.1.0 6.0 500 480 460 440 420 400 380 360 340 320 300 280 260 240 220 200 Output Current IO [A] Io [A] 0.40 5.0 Vo=3.3V VL=10uH O=5.0V O Switching frequency [kHz] Vo [V] Voltage [V] Output Vo=3.3V L=10uH Ta=25℃ V =5.0V 0.5 4.0 Switching Frequency: fSW NR110K focs NR116KLoadReg. Load Regulation: VLoad 0.0 3.0 Io [A] IO [A] Output Current VIN[V] Input Voltage VIN [V] 5.300 5.250 5.200 5.150 5.100 5.050 5.000 4.950 4.900 4.850 4.800 4.750 4.700 ISET=GND ISET=OPEN 10.0 15.0 20.0 25.0 30.0 Output Current VIN[V] IO [A] SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 5 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Functional Block Diagram VIN 2 R1 Σ OSC 7 ３ EN ON/ OFF P.REG VREF 6 ５ ISET C2 D2 （ Option) Current Sense Amp OCP ６ Drive REG 1 BS OCP_REF 0.8V PWM LOGIC ７ C1 IN ４ 3 R3 C10 L1 SW R5 OCP_REF D1 ISET OVP FB 0.8V Err Amp UVLO ８ 5 FB SS SS GND 4 C5 R6 TSD １ C4 R4 Compensation FB VO １ 8 C9 Pin Assignments & Functions Pin Assignments Pin Functions Pin No. Symbol 1 BS 2 IN 3 SW 4 GND 5 FB 6 ISET Description High-side Boost input. BS supplies the drive for High-side Nch-MOSFET switch. Connect a capacitor and a resistor between SW to BS. Power input. IN supplies the power to the IC as well as the regulator switches Power switching output. SW supplies power to the output. Connect the LC filter from SW to the output. Note that a capacitor is required from SW to BS to supply the power the High-side switch Ground Connect the exposed pad to Pin No.4 Feedback input Pin to compare Reference Voltage. The feedback threshold is 0.8V. To set the output voltage, FB Pin is required to connect between resistive voltage divider R4 and R6. Adjust Pin of OCP starting current OCP starting current can be adjusted by connecting a resistor to ISET Pin. In the case of using at Maximum Io, ISET Pin is required to connect to GND. Rev.1.0 7 EN 8 SS Enable input. Drive EN Pin high to turn on the regulator, low to turn it off. Soft-Start control input. To set the soft-start period, connect to a capacitor between GND. SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 6 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Typical Application Circuit VIN R3 VIN_s 2 IN R1 7 EN C1 C2 1 BS C10 SW Vo_s NR111E 8 SS GND 4 Vo L1 3 R5 FB ISET 6 C4 C5 5 R4 GND C9 GND R6 R7 D1 SW C1, C2: 10μF / 35V C4, C5: 22μF / 16V C9: 0.1μF C10: 0.1μF R1: 1.7MΩ L1: 10μH R3: 22Ω R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V) R6: 3.9kΩ External Components Design Guide (1)Diode D1 ・The schottky-barrier diode must be used for D1. If other diodes like fast recovery diodes are used, IC may be damaged because of the reverse voltage applied by the recovery voltage or ON voltage. (2)Choke coil L1 ・If the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the rating. ・As the start current of the over current protection is approximately 4A, attention must be paid to the heating of the choke coil by the magnetic saturation due to overload or short-circulated load. (3)Capacitor C1( C2), C4(C5), C9 ・As large ripple current across C1 (C2) and C4 (C5), capacitors with high frequency and low impedance for SMPS must be used. Especially when the impedance of C4 (C5) is high, the switching waveform may not be normal at low temperature. ・C9 is a capacitor for soft start. In case soft start function is not used, please keep Pin No.2 open. (4)Resistor R1, R2 ・R4, R5, R6 are resistor to the Output Voltage. IADJ is required to set to 0.2mA. R4, R5, R6 are calculated by the equation (1). R 4 R5 VO VFB VO 0.8 I ADJ 0.2 10 3 ， R 6 VFB 0.8 ≒ 4.0k I ADJ 0.2 10 3 ------- (1) In order to have optimum operating condition, each component must be connected with the minimum distance. Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 7 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Allowable package power dissipation NOTES 1) Glass-epoxy board mounting in a 30×30mm 2) copper area : 25×25mm 3) The power dissipation is calculated at the junction temperature 125 °C 4) Losses can be calculated by the following equation. As the efficiency is subject to the input voltage and output current, it shall be obtained from the efficiency curve and substituted in percent 5) Thermal design for D1 shall be made separately. 100 V PD VO I O 1 VF I O 1 O x VIN VO: Output voltage VIN: Input voltage IO: Output current ηx: Efficiency(%) VF: Diode forward voltage SJPB-L4…0.55V(IO=3A) Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 8 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 PCB Layout & Recommended Land Pattern (1)Each ground of all components is connected as close as possible to the Pin No.1 at one point. (2) To help heat dissipation, connect a large copper plane to exposed pad on the back side of the package. The copper plane is required for GND Front Side: Component Side (double sided board) Back Side: GND Side (double sided board) NOTES: Real size of the PCB is 60mm×60mm 0.61 (0.024) 1.27 (0.050) 1.60 (0.063) 2.35 (0.092) 5.40 (0.213) 3.24 (0.127) NOTES: 1) Dimension is in millimeters, dimension in bracket is in inches. 2) Drawing is not to scale. Recommended land pattern Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 9 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Package Outline Exposed SOIC8 package An outside size is supplied by either Package type A or Package type B. Package outline, dimensions Symbol A1 A2 ｂ D D1 E E1 E2 ｅ Ｌ MIN 0 1.398 0.330 4.80 3.053 5.893 3.73 2.033 － 0.508 Package A TYP － 1.448 － 4.902 3.18 － － 2.16 1.27 － MAX 0.1524 1.498 0.508 5.004 3.307 6.918 3.89 2.287 － 0.762 MIN ０ 1.25 0.38 4.80 3.10 5.80 3.80 2.20 － 0.45 Package B TYP 0.10 1.40 － 4.90 3.30 6.00 3.90 2.40 1.27 0.60 MAX 0.15 1.65 0.51 5.00 3.50 6.20 4.00 2.60 － 0.80 NOTES: 1) Dimension is in millimeters, dimension in bracket is in inches. 2) Drawing is not to scale. 3) Pb-free: Device composition comply with the RoHS directive. Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 10 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 Package Marking NR111E SKYMW XXXX Part Number Lot Number Y= last digit of the year (0-9) M= Month (1-9, O, N, or D) W= Week Code (1-3) Sanken Control Number Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 11 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 OPERATING PRECAUTIONS Reliability can be affected adversely by improper storage environments and handling methods. Please observe the following cautions. Heat dissipation and reliability Thermal performance of the surface mount package IC depends on the material and area size of PCB and its copper plane. Design thermal condition with sufficient margin Parallel operation The parallel operation to increase the current is not available. Thermal shut down The NR111E has a thermal protection circuit. This circuit protects the IC from the heat generation by the over load. This circuit cannot guarantee the long-term reliability against the continuously over load status. Cautions for Storage Ensure that storage conditions comply with the standard temperature (5 to 35°C) and the standard relative humidity (around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity. Avoid locations where dust or harmful gases are present and avoid direct sunlight. Reinspect for rust on leads and solderability of products that have been stored for a long time. Cautions for Testing and Handling When tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing products, shorts between the product pins, and wrong connections. In addition, avoid tests exceeded ratings Soldering When soldering the products, please be sure to minimize the working time, within the following limits. ・Reflow Preheat ; 180°C / 90±30s Heat ; 250°C / 10±1s (260°C peak ,2times) ・Soldering iron ; 380±10°C / 3.5±0.5s (1time) Electrostatic Discharge When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1MΩ of resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator. Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. When using measuring equipment such as a curve tracer, the equipment should be grounded. When soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak voltages generated by them from being applied to the products. The products should always be stored and transported in Sanken shipping containers or conductive containers, or be wrapped in aluminum foil. Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 12 Light Load High Efficiency, 31V, Buck Regulator NR110E series Oct/23/2012 IMPORTANTS NOTES The contents in this document are subject to changes, for improvement and other purposes, without notice. Make sure that this is the latest revision of the document before use. Application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and Sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of Sanken or any third party which may result from its use. Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device failure or malfunction. Sanken products listed in this document are designed and intended for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). When considering the use of Sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), please contact your nearest Sanken sales representative to discuss, prior to the use of the products herein. The use of Sanken products without the written consent of Sanken in the applications where extremely high reliability is required (aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited. In the case that you use Sanken semiconductor products or design your products by using Sanken semiconductor products, the reliability largely depends on the degree of derating to be made to the rated values. Derating may be interpreted as a case that an operation range is set by derating the load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. In general, derating factors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such as ambient temperature, humidity etc. and thermal stress caused due to self-heating of semiconductor products. For these stresses, instantaneous values, maximum values and minimum values must be taken into consideration. In addition, it should be noted that since power devices or IC’s including power devices have large self-heating value, the degree of derating of junction temperature affects the reliability significantly. When using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treating the products, please duly consider all possible risks that may result from all such uses in advance and proceed therewith at your own responsibility. Anti radioactive ray design is not considered for the products listed herein. Sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out of Sanken’s distribution network. The contents in this document must not be transcribed or copied without Sanken’s written consent. Rev.1.0 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 13