Ordering number : ENA2104 Bi-CMOS IC LV5980MC Low power consumption and high efficiency Step-down Switching Regulator Overview LV5980MC is 1ch DCDC converter with built-in power Pch MOSFET. The recommended operating range is 4.5V to 23V. The maximum current is 3A. The operating current is about 63µA, and low power consumption is achieved. Features and Functions • 1ch SBD rectification DCDC converter IC with built-in power Pch MOSFET • Typical value of light load mode current is 63µA • 4.5V to 23V Operating input voltage range • 100mΩ High-side switch • Output voltage adjustable to 1.235V • The oscillatory frequency is 370kHz • built-in OCP circuit with P-by-P method • When P-by-P is generated continuously, it shifts to the HICCUP operation • External capacitor Soft-start • Under voltage lock-out, thermal shutdown Applications • Set top boxes • Point of load DC/DC converters • White Goods • DVD/Blu-ray drivers and HDD • Office Equipment Application Circuit Example 100 VIN • LCD monitors and TVs • POS System Efficiency VOUT = 5V 90 C1 C3 80 1µF 10µF ×2 PDR L1 10µH D1 REF VOUT SW LV5980MC R3 C2 5V 10µF ×3 FB R2 V IN=12V VIN=15V 70 Efficiency -- % VIN VIN=8V 60 50 40 COMP 30 SS/HICCUP 20 R1 47kΩ C7 C6 C5 1µF 4.7nF 2.2nF GND C1: GRM31CB31E106K [murata] C2: C2102JB0J106M [TDK] L1: FDVE1040-100M [TOKO] D1: SB3003CH [SANYO] 10 0 0.1 2 3 5 7 1 2 3 5 7 10 2 3 5 7100 2 3 5 71000 2 3 5 710000 Load current -- mA Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment. 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Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' s products or equipment. N2112NKPC 20120801-S00003 No.A2104-1/16 LV5980MC Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Input voltage VIN max 25 V Allowable pin voltage VIN-SW 30 V VIN-PDR 6 V REF 6 V SS/HICCUP REF V FB REF V COMP REF V 1.35 W Allowable power dissipation Pd max Specified substrate *1 Operating temperature Topr -40 to +85 °C Storage temperature Tstg -55 to +150 °C *1 Specified substrate : 50.0mm × 50.0mm × 1.6mm, fiberglass epoxy printed circuit board, 4 layers Note 1 : Absolute maximum ratings represent the values which cannot be exceeded for any length of time. Note 2 : Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Recommended Operating Conditions at Ta = 25°C Parameter Input voltage range Symbol Conditions Ratings VIN Unit 4.5 to 23 V Electrical Characteristics at Ta = 25°C, VIN = 15V Ratings Parameter Symbol Conditions Unit min typ max Reference voltage Internal reference voltage VREF Pch drive voltage VPDR 1.210 1.235 1.260 V VIN-5.5 VIN-5.0 VIN-4.5 V FOSC 310 370 430 kHz Soft start • source current ISS_SC 1.2 1.8 2.4 µA Soft start • sink current ISS_SK IOUT = 0 to -5mA Saw wave oscillator Oscillatory frequency Soft start circuit VIN = 3V, SS = 0.4V µA 300 UVLO circuit UVLO release voltage VUVLON FB = COMP 3.3 3.7 4.1 V UVLO lock voltage VUVLOF FB = COMP 3.02 3.42 3.82 V 380 µA/V Error amplifier Input bias current IEA_IN Error amplifier gain GEA -100 -10 100 220 nA Output sink current IEA_OSK FB = 1.75V -30 -17 -8 µA Output source current IEA_OSC FB = 0.75V 8 17 30 µA 3.5 4.7 6.2 Over current limit circuit Current limit peak ICL HICCUP timer start-up cycle NCYC 15 A HICCUP comparator threshold voltage VtHIC 0.15 V HICCUP timer discharge current IHIC 0.25 µA cycle PWM comparator Maximum on-duty DMAX 94 % Output Output on resistance RON IO = 0.5A Light load mode consumption current ISLEEP No switching Thermal shutdown TSD Design guarantee *2 100 mΩ The entire device 63 170 83 µA °C *2 : Design guarantee: Signifies target value in design. These parameters are not tested in an independent IC. No.A2104-2/16 LV5980MC Package Dimensions unit : mm (typ) 3424 Pd max – Ta Allowable power dissipation, Pd max -- W 2.0 4.9 1 0.835 0.375 2 0.42 0.2 1.75 MAX 1.27 6.0 3.9 8 1.5 1.35 1.0 0.70 0.5 0 --40 --20 0 20 40 60 80 100 0.175 Ambient temperature, Ta -- °C SANYO : SOIC8 Specified substrate Top Bottom 2nd/3rd layers No.A2104-3/16 LV5980MC Pin Assignment TOP VIEW PDR 1 GND 2 8 SW 7 VIN LV5980MC SS/HICCUP 3 6 REF COMP 4 5 FB SOIC8 Pin Function Description Pin No, Pin Name 1 PDR 2 GND 3 SS/HICCUP Function Pch MOSFET gate drive Voltage. The bypass capacitor is necessarily connected between this pin and VIN. Ground Pin. Ground pin voltage is reference voltage Capacitor connection pin for soft start and setting re-startup cycle in HICCUP mode. About 1.8uA current charges the soft start capacitor. 4 COMP Error Amplifier Output Pin. The phase compensation network is connected between GND pin and COMP pin. Thanks to current-mode control, comp pin voltage would tell you the output current amplitude. Comp pin is connected internally to an Init.comparator which compares with 0.9V reference. If comp pin voltage is larger than 0.9V, IC operates in “continuous mode”. If comp pin voltage is smaller than 0.9V, IC operates in “discontinuous mode (low consumption mode)”. 5 FB Error amplifier reverse input pin. ICs make its voltage keep 1.235V. Output voltage is divided by external resistances and it across FB. 6 REF 7 VIN Reference voltage. Supply voltage pin. It is observed by the UVLO function. When its voltage becomes 3.7V or more, ICs startup in soft start. 8 SW High-side Pch MOSFET drain Pin. No.A2104-4/16 LV5980MC Block Diagram VIN Wake-up REF Band-gap TSD REF uvlo.comp Bias 1.235V Pch Drive enable PDR ILIM Logic HICCUP_SD pwm comp SS_END.comp SS/HICCUP HICCUP_SD enable 15pulse counter PbyP.comp ocp.comp HICCUP_SD FB error.amp slope OSC COMP S Q CK RQ clk Level-shift SW lnit.comp PDR gnd GND No.A2104-5/16 LV5980MC Pin Equivalent Circuit Pin No. 1 Pin name Equivalent circuit PDR VIN 1.3MΩ 1.5MΩ 10kΩ PDR 10kΩ 10Ω GND 2 GND 3 SS/HICCUP VIN GND VIN 10kΩ 1kΩ SS/HICCUP 10kΩ 1kΩ GND 4 COMP VIN 70kΩ 1kΩ COMP 1kΩ GND 5 FB VIN 10kΩ 1kΩ FB 1kΩ GND Continued on next page. No.A2104-6/16 LV5980MC Continued from preceding page. Pin No. 6 Pin name REF Equivalent circuit VIN 10Ω REF 10Ω 51kΩ 1MΩ 450kΩ GND 7 VIN VIN GND 8 SW VIN 22mΩ SW No.A2104-7/16 LV5980MC Detailed Description Power-save Feature The LV5980MC has Power-saving feature to enhance efficiency when the load is light. By shutting down unnecessary circuits, operating current of the IC is minimized and high efficiency is realized. Output Voltage Setting Output voltage (VOUT) is configurable by the resistance R3 between VOUT and FB and the R2 between FB and GND. VOUT is given by the following equation (1). VOUT = (1 + R3 R3 ) × VREF = (1 + ) × 1.235 [V] R2 R2 (1) Soft Start Soft start time (TSS) is configurable by the capacitor (C5) between SS/HICCUP and GND. The setting value of TSS is given by the equation (2). TSS = C5 × VREF 1.235 = C5 × [ms] ISS 1.8 × 10-6 (2) Hiccup Over-Current Protection Over-current limit (ICL) is set to 4.7A in the IC. When the peak value of inductor current is higher than 4.7A for 15 consecutive times, the protection deems it as over current and stops the IC. Stop period (THIC) is defined by the discharging time of the SS/HICCUP. When SS/HICCUP is lower than 0.15V, the IC starts up. When SS/HICCUP is higher than 0.3V and then over current is detected, the IC stops again. And when SS/HICCUP is higher than 1.235V, the discharge starts again. When the protection does not detect over-current status, the IC starts up again. The IC stops when the peak value of inductor current is higher than overcurrent limit for 15 consecutive times. ICL IL * The stop time defined by the discharging time of the SS/HICCUP. SS/HICCUP THIC 0.3V 1.235V The IC starts up when SS/HICCUP is lower than 0.15V. •The IC stops when SS/HICCUP is higher than 0.3V and overcurrent is detected. •The IC starts up again if no overcurrent is detected. 0.15V FB No.A2104-8/16 LV5980MC Design Procedure Inductor Selection When conditions for input voltage, output voltage and ripple current are defined, the following equations (3) give inductance value. L= VIN - VOUT × TON ∆IR TON = FOSC VF VIN VOUT (3) 1 {((VIN - VOUT) ÷ (VOUT + VF)) + 1} × FOSC : Oscillatory Frequency : Forward voltage of Schottky Barrier diode : Input voltage : Output voltage • Inductor current: Peak value (IRP) Current peak value (IRP) of the inductor is given by the equation (4). VIN - VOUT IRP = IOUT + × TON 2L (4) Make sure that rating current value of the inductor is higher than a peak value of ripple current. • Inductor current: ripple current (∆IR) Ripple current (∆IR) is given by the equation (5). ∆IR = VIN - VOUT × TON L (5) When load current (IOUT) is less than 1/2 of the ripple current, inductor current flows discontinuously. Output Capacitor Selection Make sure to use a capacitor with low impedance for switching power supply because of large ripple current flows through output capacitor. This IC is a switching regulator which adopts current mode control method. Therefore, you can use capacitor such as ceramic capacitor and OS capacitor in which equivalent series resistance (ESR) is exceedingly small. Effective value is given by the equation (6) because the ripple current (AC) that flows through output capacitor is saw tooth wave. IC_OUT = VOUT × (VIN - VOUT) 1 × [Arms] 2√3 L × FOSC × VIN (6) Input Capacitor Selection Ripple current flows through input capacitor which is higher than that of the output capacitors. Therefore, caution is also required for allowable ripple current value. The effective value of the ripple current flows through input capacitor is given by the equation (7). IC_IN = √D (1 - D) × IOUT [Arms] D= (7) TON VOUT = T VIN In (7), D signifies the ratio between ON/OFF period. When the value is 0.5, the ripple current is at a maximum. Make sure that the input capacitor does not exceed the allowable ripple current value given by (7). With (7), if VIN=15V, VOUT=5V, IOUT=1.0A and FOSC=370 kHz, then IC_IN value is about 0.471Arms. In the board wiring from input capacitor, VIN to GND, make sure that wiring is wide enough to keep impedance low because of the current fluctuation. Make sure to connect input capacitor near output capacitor to lower voltage bound due to regeneration current.When change of load current is excessive (IOUT: high ⇒ low), the power of output electric capacitor is regenerated to input capacitor. If input capacitor is small, input voltage increases. Therefore, you need to implement a large input capacitor. Regeneration power changes according to the change of output voltage, inductance of a coil and load current. No.A2104-9/16 LV5980MC Selection of external phase compensation component This IC adopts current mode control which allows use of ceramic capacitor with low ESR and solid polymer capacitor such as OS capacitor for output capacitor with simple phase compensation. Therefore, you can design long-life and high quality step-down power supply circuit easily. Frequency Characteristics The frequency characteristic of this IC is constituted with the following transfer functions. (1) Output resistance breeder : HR (2) Voltage gain of error amplifier : GVEA Current gain : GMEA (3) Impedance of phase compensation external element : ZC (4) Current sense loop gain : GCS (5) Output smoothing impedance : ZO VIN 1/GCS OSC Current sence loop GVER GMER FB D CLK Q C R SW VOUT COMP VREF R2 CC ZC RC HR R1 CO RL ZO Closed loop gain is obtained with the following formula (8). G = HR • GMER • ZC • GCS • ZO = VREF RL 1 • GMER • RC + • GCS • SCC 1 + SCO • RL VOUT (8) Frequency characteristics of the closed loop gain is given by pole fp1 consists of output capacitor CO and output load resistance RL, zero point fz consists of external capacitor CC of the phase compensation and resistance RC, and pole fp2 consists of output impedance ZER of error amplifier and external capacitor of phase compensation CC as shown in formula (8). fp1, fz, fp2 are obtained with the following equations (9) to (11). fp1 = fz = 1 2π • CO • RL 1 2π • CC • RC fp2 = 1 2π • ZER • CC (9) (10) (11) No.A2104-10/16 LV5980MC Calculation of external phase compensation constant Generally, to stabilize switching regulator, the frequency where closed loop gain is 1 (zero-cross frequency fZC) should be 1/10 of the switching frequency (or 1/5). Since the switching frequency of this IC is 370kHz, the zero-cross frequency should be 37kHz. Based on the above condition, we obtain the following formula (12). VREF RL 1 • GMER • RC + • GCS • =1 SCC 1 + SCO • RL VOUT (12) As for zero-cross frequency, since the impedance element of phase compensation is RC >>1/SCC, the following equation (13) is obtained. VREF RL • GMER • RC • GCS • =1 VOUT 1 + 2π • fZC • CO • RL (13) Phase compensation external resistance can be obtained with the following formula (14), the variation of the formula (13). Since 2π • fZC • CO • RL >> 1 in the equation (14), we know that the external resistance is independent of load resistance. VOUT 1 + 2π • fZC • CO • RL 1 1 RC = • • • RL VREF GMER GCS (14) When output is 5V and load resistance is 5Ω (1A load), the resistances of phase compensation are as follows. GCS = 2.7A/V, GMER = 220µA/V, fZC = 37kHz 5 1 1 1 + 2 × 3.14 × (37 × 103) × (30 × 10-6) × 5 RC = × × = 48.898…× 103 -6 × 1.235 220 × 10 2.7 5 = 48.90 [kΩ] If frequency of zero point fz and pole fp1 are in the same position, they cancel out each other. Therefore, only the pole frequency remains for frequency characteristics of the closed loop gain. In other words, gain decreases at -20dB/dec and phase only rotates by 90º and this allows characteristics where oscillation never occurs. fp1 = fz 1 1 • 2π • CO • RL 2π • CO • RC CC = RL • CO 5 × (30 × 10-6) • = 3.067…× 10-9 RC 48.9 × 103 = 3.07 [nF] The above shows external compensation constant obtained through ideal equations. In reality, we need to define phase constant through testing to verify constant IC operation at all temperature range, load range and input voltage range. In the evaluation board for delivery, phase compensation constants are defined based on the above constants. The zero-cross frequency required in the actual system board, in other word, transient response is adjusted by external compensation resistance. Also, if the influence of noise is significant, use of external phase compensation capacitor with higher value is recommended. No.A2104-11/16 LV5980MC Caution in pattern design Pattern design of the board affects the characteristics of DC-DC converter. This IC switches high current at a high speed. Therefore, if inductance element in a pattern wiring is high, it could be the cause of noise. Make sure that the pattern of the main circuit is wide and short. (3) Orange : High Side MOSFET ON Red : High Side MOSFET OFF L1 (2) VOUT Cout (4) GND D1 C3 Cin (6) (5) (1) VIN (1) Pattern design of the input capacitor Connect a capacitor near the IC for noise reduction between VIN and the GND. The change of current is at the largest in the pattern between an input capacitor and VIN as well as between GND and an input capacitor among all the main circuits. Hence make sure that the pattern is as fat and short as possible. (2) Pattern design of an inductor and the output capacitor High electric current flows into the choke coil and the output capacitor. Therefore this pattern should also be as fat and short as possible. (3) Pattern design with current channel into consideration Make sure that when High side MOSFET is ON (red arrow) and OFF (orange arrow), the two current channels runs through the same channel and an area is minimized. (4) Pattern design of the capacitor between VIN-PDR Make sure that the pattern of the capacitor between VIN and PDR is as short as possible. (5) Pattern design of the small signal GND The GND of the small signal should be separated from the power GND. (6) Pattern design of the FB-OUT line Wire the line shown in red between FB and OUT to the output capacitor as near as possible. OUT FB Fig: FB-OUT Line No.A2104-12/16 LV5980MC Typical Performance Characteristics Application Curves at Ta = 25°C 100 Efficiency 100 VOUT = 1.235V 90 VOUT = 1.8V 90 VIN=5V 70 15V 8V 60 12V 50 40 70 40 20 20 10 0.1 2 3 5 7 1 2 3 5 7100 2 3 5 71000 2 3 5 710000 2 3 5 7 10 Load current -- mA Efficiency VOUT = 3.3V 90 Efficiency -- % 100 VIN=5V 8V 70 50 40 15V 60 50 40 30 20 20 2 3 5 7100 2 3 5 71000 2 3 5 710000 12V 70 30 2 3 5 7 10 VIN=8V 80 12V 60 10 0.1 2 3 5 7 1 Efficiency VOUT = 5V 90 15V 80 2 3 5 7100 2 3 5 71000 2 3 5 710000 Load current -- mA Efficiency -- % 100 15V 50 30 2 3 5 7 10 12V 8V 60 30 10 0.1 2 3 5 7 1 V IN=5V 80 Efficiency -- % 80 Efficiency -- % Efficiency 10 0.1 2 3 5 7 1 2 3 5 7 10 Load current -- mA 2 3 5 7100 2 3 5 71000 2 3 5 710000 Load current -- mA Operation Waveforms (Circuit from Typical Application, Ta = 25°C, VIN = 15V, VOUT = 5V) Light load mode Output Voltage IOUT = 10mA IOUT = 10mA VSW 5V/DIV VOUT 20mV/DIV IL 0.5A/DIV IL 0.5A/DIV 10µs/DIV 10µs/DIV No.A2104-13/16 LV5980MC Discontinious current mode Output Voltage IOUT = 200mA IOUT = 200mA VSW 5V/DIV VOUT 20mV/DIV IL 0.5A/DIV IL 0.5A/DIV 2µs/DIV 2µs/DIV Continious current mode Output Voltage IOUT = 2A IOUT = 2A VSW 5V/DIV VOUT 20mV/DIV IL 1A/DIV IL 1A/DIV 2µs/DIV 2µs/DIV Load Transient response Soft start and shutdown IOUT = 0.5 2.5A, Slew Rate = 100µA IOUT = 2A VIN 20V/DIV VOUT 0.2V/DIV VSS/HICCUP 2V/DIV IOUT 2A/DIV VOUT 2V/DIV 500µs/DIV 2ms/DIV Over current protection OUT - GND short VOUT 5V/DIV VSS/HICCUP 5V/DIV VSW 20V/DIV IOUT 5A/DIV 20ms/DIV No.A2104-14/16 LV5980MC Characterization Curves at Ta = 25°C, VIN = 15V 90 Light Load Mode Consumption Current Internal Reference Voltage 1.26 Internal reference voltage -- V 80 Input current -- µA 70 60 50 40 30 20 1.25 1.24 1.23 1.22 10 0 --50 --25 0 25 50 75 100 125 1.21 --50 150 --25 0 Temperature -- °C Output on resistance 140 4.9 120 4.8 100 80 60 40 20 0 --50 50 75 100 125 150 100 125 150 100 125 150 Current limit peak 5 Current limit peak -- A Output on resistance -- mΩ 160 25 Temperature -- °C 4.7 4.6 4.5 4.4 4.3 --25 0 25 50 75 100 125 4.2 --50 150 --25 0 Temperature -- °C Oscillatory Frequency 400 25 50 75 Temperature -- °C UVLO 3.8 3.7 380 UVLO release voltage 370 UVLO voltage -- V Oscillatory frequency -- kHz 390 360 350 340 330 320 3.6 3.5 3.4 UVLO lock voltage 3.3 310 300 --50 --25 0 25 50 75 100 125 3.2 --50 150 --25 0 Temperature -- °C Soft Start Source Current 0.33 HICCUP timer charge current -- µA Soft start source current -- µA 2 1.9 1.8 1.7 1.6 1.5 --50 --25 0 25 50 75 Temperature -- °C 25 50 75 Temperature -- °C 100 125 150 HICCUP Timer Discharge Current 0.31 0.29 0.27 0.25 0.23 0.21 0.19 0.17 --50 --25 0 25 50 75 100 125 150 Temperature -- °C No.A2104-15/16 LV5980MC Recommended foot pattern: SOIC8 SOLDERING FOOTPRINT* 1.52 0.060 7.0 0.275 0.6 0.024 4.0 0.155 1.270 0.050 SCALE 6:1 mm ( inches ( *For additional information on our Pd-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellectual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of September, 2012. Specifications and information herein are subject to change without notice. PS No.A2104-16/16