SPI-8000A SANKEN | Alldatasheet

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Technical content

52 ICs

■Features

  • Surface-mount 16 pin package
  • Output current: 3.0A
  • High efficiency: 91% (at V IN = 10V, lO = 1A, VO = 5V)
  • Capable of downsizing a choke-coil due to IC's high switching frequency (125kHz). (Com- pared with conventional Sanken devices)
  • The output-voltage-variable type can vary its output voltage from 1V to 14V because of its low reference voltage (Vref) of 1V.
  • Wide Input Voltage Range (8 to 50V)
  • Output ON/OFF available
  • Built-in overcurrent and thermal protection circuits ■Absolute Maximum Ratings Unit V W °C/W °C/W Ratings 2.4 +125 –40 to +125 Symbol VIN PD*1, *2 Tj Tstg θj-c*2 θj-a*2 Parameter DC Input Voltage Power Dissipation Junction Temperature Storage Temperature Thermal Resistance (junction to case) Thermal Resistance (junction to ambient air) (Ta=25°C) Parameter DC Input Voltage Range Output Voltage Range Output Current Range Operating Junction Temperature Range Operating Temperature Range Symbol VIN VO IO Tjop Top Ratings SPI-8010A (8 or Vo+3)*1 to 50 1 to 14 0.02 to 3.0 –30 to +125 –30 to +125 *1: The minimum value of an input voltage range is the higher of either 8V or VO+3V. ■Recommended Operating Conditions *1: Limited due to thermal protection. *2: When mounted on glass-epoxy board 700cm 2 (copper laminate area 30.8cm2). ■Electrical Characteristics Unit V kHZ mV mV mV/°C A mA µA V µA Parameter Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Reference Voltage Overcurrent Protection Starting Current Quiescent Circuit Current Circuit Current at Output OFF CE/SS Low Level Voltage Terminal Outflow Current at Low Voltage Symbol VADJ Conditions Eff Conditions FOSC Conditions ∆VOLINE Conditions ∆VOLOAD Conditions ∆VADJ/∆Ta IS Conditions Iq Conditions Iq(off) Conditions VSSL ISSL Conditions (Ta=25°C) * Pin 4 is the CE/SS pin. Soft start at power on can be performed with a capacitor connected to this pin. The output can also be turned ON/OFF with this pin. The output is stopped by setting the voltage of this pin to V SSL or lower. CE/SS-pin voltage can be changed with an open- collector drive circuit of a transistor. When using both the soft-start and ON/OFF functions together, the discharge current from C 4 flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the transistor if C3 capacitance is large. The CE/SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited. Rating SPI-8010A (Variable type) min. typ. max. 0.97 1.00 1.03 VIN=12V, IO=1A VIN=20V , IO=1A, VO=5V 250 VIN=12V, IO=1A 20 40 VIN=10 to 30V, IO=1A 10 30 VIN=12V, IO=0.1 to 1.5A ±0.5 3.1 VIN=12V VIN=12V, IO=0A 400 VIN=12V, VON/OFF=0.3V 0.5 VSSL=0V Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICsSPI-8000A Series ■Applications
  • Onboard local power supplies
  • O A equipment
  • F or stabilization of the secondary-side output voltage of switching power supplies SPI-8000A SPI-8000A CE/SS 4 CE/SS 4 CE/SS C4C4 VO. ON/OFF Soft start Soft start +VO. ON/OFF SPI-8000A 1-1-2 Switching Mode Regulator ICs

■External Dimensions (HSOP16) (Unit : mm) ■Block Diagram a 10.5±0.2 16 9 b c 8010A SK 16 9 (11) 12.2±0.2 0.25+0.15/-0.05 (Gate remains: Not included in dimensions) S S 0.10 2.75MAX 2.5±0.2 2.0+0.2/-0.08 10.5±0.3 (2) (4.5) 7.5±0.2 1+0.1/-0.05 (Heatsink thickness) CE/SS UVLO OCPP.REG OSC PWM LOGIC CE/SS TSD Reg Comp GND Boot REG DRIVE BS SWOUT VREF VIN -Amp SPI-8010A Pin Assignment 1.AGND 2.N.C 3.DGND 4.CE/SS 5.Reg 6.N.C 7.SW OUT 8.N.C 9.N.C 10.N.C 11.VIN 12.B.S 13.N.C 14.Comp 15.VREF 16.N.C Product Mass : Approx 0.86g

54 ICs

■Ta-PD Characteristics ■Typical Connection Diagram SPI-8010A C1: 220µF/63V C2: 470µF/25V C3: 0.1µF C4: 1000pF C5: 0.1µF C6: 0.047µF C7: 0.1µF C8: 0.1µF C9: 6800pF R1: 47Ω L1: 47µH D1: SPB-G56S (Sanken) Diode D

  • Be sure to use a Schottky-barrier diode for D 1. If other diodes like fast recovery diodes are used, ICs may be destroyed because of the reverse voltage generated by the recovery voltage or ON voltage. Choke coil L1
  • If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value.
  • As the overcurrent protection starting current is about 4.5A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to overload or short-circuited load. Capacitors C 1, C2
  • As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use. Especially when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures. For C2, do not use a capacitor with an extremely low equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may cause an abnormal oscillation. Resistors R2, R3
  • R 2 and R3 are the resistors to set the output voltage. Set their values so that IREF becomes approx. 2mA. Obtain R2 and R3 values by the following formula: To create the optimum operating conditions, place the components as close as possible to each other. Reg CE/SS VIN SWOUT VREF VIN GND GND Comp R3 IREF AGND DGND B.S SPI-8010A C1 C7 C2 C8 Note 1: The efficiency depends on the input voltage and the output cur- rent. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. Note 2: Thermal design for D 1 must be considered separately. VO : Output voltage VIN : Input voltage IO : Output current ηχ : Efficiency (%) VF : Diode D1 forward voltage SPB-G56S···0.4V(IO=2A) 3.00 2.50 2.00 1.50 1.00 0.50 0–30 0 25 50 75 100 125 Power Dissipation PD (W) Ambient Temperature Ta (°C) j-a:62.5°C/W(0.84cm2) j-a:47.6°C/W(8.64cm2) j-a:41.7°C/W(30.8cm2)θ θ θ PD=VO • IO 100 –1 –VF • IO 1– VO ηχ VIN 1-1-2 Switching Mode Regulator ICs R2= (VOUT–VREF) = (VOUT–1) (Ω), R3 = VREF = 1 500(Ω) IREF 2×10–3 IREF 2×10–3 =..