NR885E

3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 Package General Descriptions  Exposed SOIC 8 Thermally enhanced 8-Pin package D es ig ns The NR885E is synchronous buck regulator ICs integrates High-side and Low-side power MOSFETs. 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 regulator. 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 NR885E is available in an 8-pin SOIC package with an exposed thermal pad on the back side. Features & Benefits ew Electrical Characteristics  Current mode PWM control  Up to 95% efficiency  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/OFF the regulator function fo rN  3A output current  Operating input range VIN = 4.5V～18V  Output adjustable VO= 0.8V～14V  Fixed 350kHz frequency  LCD TV / Blu-Ray / Set top box  Green Electronic products  Other power supply en de d Applications R ec o m m Basic Connection of NR885E N ot NR885E C1, C2: 10μF / 25V C4, C5: 22μF / 16V C9: 0.1μF C3: 0.1μF Rev.1.1 R1: 100kΩ L1: 10μH R3: 22Ω R4: 8.2 kΩ, R5: 4.3kΩ (Vo=3.3V) R6: 3.9kΩ SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 1 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 Series Lineup (1) (2) Product No. fSW VIN NR885E 350kHz VO (1) 4.5V to 18V IO (2) 0.8V to 14V 3A The minimum input voltage shall be either of 4.5V or V O+3V, whichever is higher. The I/O condition limited by the Minimum on-time (TON(MIN)). Absolute Maximum Ratings Ratings Units VIN 20 V Glass-epoxy board mounting in a 30×30mm. (copper area in a 25×25mm) Max TJ =150°C PD 1.76 W Junction temperature (4) TJ 40 to 150 °C Storage temperature Thermal resistance (junction- Pin No. 4) TS 40 to 150 θJP 26 Thermal resistance (junction-ambient air) θJA 71 rN °C /W fo °C /W 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 en de (4) °C d (3) D Power dissipation (3) ew DC input voltage Condition ns Symbol es ig Parameter ec o DC input voltage m Parameter m Recommended Operating Conditions R DC output current Output voltage (5) Symbol Ratings Units MIN MAX VIN Vo+3 18 V Io 0 3.0 A Vo 0.8 14 V Condition (6) (7) N ot (7) Ambient operating temperature Top 85 °C 40 (5) The minimum value of input voltage is taken as the larger one of either 4.5V or VO +3V. In the case of VIN=VO +1～VO +3V , it is set to IO = Max. 2A (6) Recommended circuit refers to Typical Application Circuit. (7) To be used within the allowable package power dissipation characteristics. Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 2 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 Electrical Characteristics Ta = 25°C Symbol Reference voltage Output voltage temperature coefficient TYP MAX VREF 0.784 0.800 0.816 ⊿VREF/⊿T ― ±0.05 ― 350 420 V VIN = 12V，IO = 1.0A V = 12V, IO = 1.0A mV/°C IN 40°C to +85°C VIN =12V, VO=3.3V, kHz IO =1A VIN = 6.3V～18V, mV VO = 3.3V, IO = 1A VIN = 12V, VO = 3.3V, mV IO = 0.1A～3.0A (8) VLine ― 50 ― Load regulation (8) VLoad ― 50 ― Over current protection threshold IS 3.1 ― 6.0 Supply Current IIN ― 6 ― IIN(off) 0 ― 10 μA IEN/SS 6 10 14 μA VSS=0V, VIN=12V 3.0 ― V VIN =12V 50 100 μA VEN= 10V 0.7 1.4 2.1 V VIN =12V DMAX ― 90 ― % TON(MIN) ― 150 ― nsec 151 165 ― °C ― 20 ― °C Source current at low level voltage High level voltage Sink current EN Pin IEN Threshold voltage VC/EH (8) Minimum on-time m (9) en (8) Max on-duty ― VSSH m Thermal shutdown threshold (8) TSD temperature Thermal shutdown (8) restart hysteresis TSD_hys of temperature (8) Guaranteed by design, not tested. (9) The I/O characteristic are limited by the TON(MIN). D A mA VIN = 12V, VO = 3.3V VIN = 12V VEN=10kΩ pull up to VIN VIN =12V, IO =0A, VEN=0V N ot R ec o d SS Pin ew Shutdown Supply Current es ig Line regulation rN 280 Test conditions fo fSW Units de Switching frequency MIN ns Parameter Ratings Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 3 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 Typical Performance Characteristics NR885E Typical Performance Characteristics Efficiency Efficiency [%] EFF(%) 効率(Vo=1.8V) VO=1.8V 100 90 80 70 60 50 40 30 20 10 0 0.5 1 1.5 2 2.5 es ig 0 ns VIN=5V 6V 8V 10V 12V 15V 18V 3 3.5 Io(A) ew 100 90 80 70 60 50 40 30 20 10 0 0.5 fo 1 1.5 2 2.5 3 de 0 rN VIN=6V 8V 10V 12V 15V 18V d Efficiency [%] EFF(%) NR880K ES1 HSOP8 S1 RT(Vo=3.3V) VO=3.3V D Output Current: IO [A] en m m R 0.0 0.5 1.0 EfficiencyEfficiency[%] [%] 1.5 2.0 3.0 3.5 VO=12V Vo=12V 100 90 80 70 60 50 40 30 20 10 0 VIN =14V 15V 18V 0.0 0.5 1.0 1.5 2.0 Output Current: IO [A] Rev.1.1 2.5 Output Current: IO [A] 負荷電流Io[A] ot N VO=5V Vo=5V VIN=8V 10V 12V 15V 18V ec o EfficiencyEfficiency[%] [%] 100 90 80 70 60 50 40 30 20 10 0 3.5 Io(A) Output Current: IO [A] 2.5 3.0 3.5 負荷電流Io[A] SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 4 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 NR885E Typical Performance Characteristics Output startup Over Current Protection VVo=3.3V O=3.3V 3.00 2.50 VIN = 8V 10V 12V 15V 18V 2.00 1.50 1.00 ns Io = 0A 0.5A 1A 2A 3A 3.50 0.50 0.00 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Output Current IO [A] VIN [V] 4.5 5.0 出力電流Io [A] D Input Voltage es ig 出力電圧Vo [V] Output Voltage [V] Output Voltage [V] VO=3.3V, Load = Constant Resistance Switching Frequency: fSW ew Load Regulation: VLoad 3.31 de d 3.29 3.27 3.25 0 0.5 1 1.5 2 2.5 3 3.5 Io(A) 400 390 380 370 360 350 340 330 320 310 300 VIN = 6V 8V 10V 12V 15V 18V 0 0.5 1 1.5 2 2.5 3 Output Current IO [A] 3.5 Io(A) m m Output Current IO [A] VO=3.3V rN 3.33 fo VIN = 6V 8V 10V 12V 15V 18V 3.35 en Output Voltage [V]Vo(V) O ｆ(kHz) Switching Frequency {kHz} NR880K ES1 HSOP8 S1 RT(Vo=3.3V) NR880K ES1 V HSOP8 S1 RT(Vo=3.3V) =3.3V Supply Current : IIN NR880K ES1 DIP28 Iqoff vs VIN at RT V S1=0V Io=0A VO=3.3V ec o Shutdown Supply Current : IIN(off) EN:Open 7 ot Current [mA] 無負荷時動作電流Iq [mA ] R 10 9 8 7 6 5 4 3 2 1 0 N Iqoff( μ Current [μA] A) EN 5 4 3 2 1 0 0 2 4 6 8 10 12 14 Input Voltage VIN [V] Rev.1.1 6 16 18 20 VIN(V) 0 2 4 6 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 8 10 12 14 16 18 入力電圧Vin [V] Input Voltage VIN [V] 5 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 rN ew D es ig ns Functional Block Diagram en de d fo Pin Assignments & Functions 1 BS R IN ot 2 SW N 3 Rev.1.1 m Symbol 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 ec o Pin No. m Pin Assignments Pin Functions 4 GND 5 FB 6 NC 7 EN 8 SS 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. No Connection. 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 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 External Components Design Guide (1)Diode D1 ・Flywheel diode D1 can be connected to enhance the efficiency. ・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. ns (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. D es ig (3)Capacitor C1( C2), C4(C5), C7 ・As large ripple currents 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. ・C7 is a capacitor for soft start. A soft-start controls the over-shoot of the output voltage rising and rush current. 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) fo R 4  R5  rN ew (4)Resistor R4, R5, R6 ・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). N ot R ec o m m en de d In order to have optimum operating condition, each component must be connected with the minimum distance. Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 7 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 rN ew D es ig ns Allowable package power dissipation en de d fo 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. VO: Output voltage VIN : Input voltage IO : Output current ηx : Efficiency (%) N ot R ec o m m   100 PD  VO  I O   1   x Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 8 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 PCB Layout Example& Recommended Land Pattern fo rN ew D es ig ns (1) Each ground of all components is connected as close as possible to the Pin No.4 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) NR885E N ot R ec o m m en de d Circuit Diagram of Demo-board PCB Back Side: GND Side (double sided board) Circuit-diagram As for the part number of the demonstration board "circuit-diagram", a circuit board concerned doesn't partly fit each other with the above application circuit example and so on for NR110, NR120 and the NR880 series common use. Approve it in advance. C9, R9 and C10 aren't used in the NR880 series. And, D1, D2, R3, R8,R10, C11 and C12 are options. Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 9 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 NOTES: Real size of the PCB is 60mm×60mm 0.61 (0.024) 1.27 (0.050) 1.60 (0.063) 5.40 (0.213) D es ig ns 2.35 (0.092) rN NOTES: 1) Dimension is in millimeters, dimension in bracket is in inches. 2) Drawing is not to scale. ew 3.24 (0.127) N ot R ec o m m en de d fo Recommended land pattern Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 10 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 Package Outline Exposed SOIC8 package 2.16±0.127 (0.085±0.005) 3.89 (0.153) 3.73 (0.147) es ig ns 6.918(0.244) 5.893(0.232) 0.508(0.020) 0.330(0.130) 3.18±0.127 (0.120±0.005) Top view ew D Bottom view 4.902±0.102 rN (0.193± 0.004) fo 1.448±0.05 (0.057±0.002) 1.27(0.050) BSC 0.1524(0.006 ) 0.000(0.000) de Side view en Front view d 0.102(0.004) ec o m m 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. N ot R Package Marking NR885E 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.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 11 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 OPERATING PRECAUTIONS Reliability can be affected adversely by improper storage environments and handling methods. Please observe the following cautions. 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. es ig ns 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 D Soldering When soldering the products, please be sure to minimize the working time, within the following limits. ・Reflow Preheat ; 180°C / 90±30 s Heat ; 250°C / 10±1s (260°C peak ,2times) ・Soldering iron ; 380±10°C / 3.5±0.5s (1time) rN ew 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. fo  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. N ot R ec o m m en de d  The products should always be stored and transported in Sanken shipping containers or conductive containers, or be wrapped in aluminum foil. Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 12 3A, 18V, 350kHz , Synchronous Buck Regulator NR885E Dec./02/2014 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. ns  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. rN ew D es ig  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. m en de d fo  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. ec o m  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. R  Sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out of Sanken’s distribution network. N ot  The contents in this document must not be transcribed or copied without Sanken’s written consent. Rev.1.1 SANKEN ELECTRIC CO., LTD. http://www.sanken-ele.co.jp 13