SPI-8002TW

1-1-3 DC/DC Converter ICs SPI-8001TW/SPI-8002TW/SPI-8003TW 2-Output, Step-down Switching Mode ■Features • 2 regulators combined in one package • Output current: 1.5A × 2 (HSOP 16 Pin Surface mount package) • High efficiency: TYP80% (SPI-8001TW), TYP78% (SPI-8002TW) • Variable output voltage: 1.0 to 16V (SPI8001TW), 1.0 to 24V (SPI-8002TW) • Built-in reference oscillator (250kHz): Enables to downsize a choke-coil • Low circuit current consumption: ≤ 1µA (at output OFF) • High accuracy reference voltage: ± 1% • Built-in foldback-overcurrent and thermal protection circuits • Built-in ON/OFF circuit (soft start available) – per output Parameter Symbol VIN Input Voltage Power Dissipation*2, *3 Junction Temperature Storage Temperature Thermal Resistance (junction to case)*2 Thermal Resistance (junction to ambient air)*2 VCC VC/E PD Tj Tstg +135 –40 to +135 9.0 35.8 SPI-8001TW 21 21 21 ■Absolute Maximum Ratings*1 Ratings SPI-8002TW 40 40 40 3.0 +150 –40 to +150 SPI-8003TW 40 40 40 Unit V V V W °C °C °C/W °C/W θ j-c θ j-a *1: Absolute maximum ratings show the destructive limit. No parameter should exceed the ratings in transient or normal operations. *2: When mounted on glass-epoxy board 70cm2 (copper laminate area 30.8cm2). *3: Limited by thermal protection. ■Applications • Onboard local power supplies • OA equipment • For stabilization of the secondary-side output voltage of switching power supplies ■Recommended Operating Conditions*1 Ratings Parameter Symbol VIN Input Voltage Range Output Voltage Range Output Current Range Operating Junction Temperature Range Operating Temperature Range VCC VC/E VO IO Tjop Top –30 –30 1 SPI-8001TW min. VO+3 4.5 max. 20 20 20 16 1.5 +135 +135 –30 –30 1 SPI-8002TW min. VO+3 4.5 max. 38 38 38 24 1.5 +135 +135 –30 –30 1 SPI-8003TW min. VO+3 4.5 max. 38 38 38 24 1.5 +125 +85 V V V V A °C °C Unit *1: Recommended operating conditions show the operating conditions required for the normal circuit function described in the electrical characteristics. These conditions must be followed in actual use. 58 ICs SPI-8001TW/SPI-8002TW/SPI-8003TW ■Electrical Characteristics*1 Ratings Parameter Symbol min. Reference Voltage Temperature Coefficient of Reference Voltage Efficiency 1*2 Efficiency 2*2 Oscillation Frequency Line Regulation Load Regulation Overcurrent Protection Starting Current Quiescent Circuit Current 1 Quiescent Circuit Current 2 Quiescent Circuit Current 3 Quiescent Circuit Current 4 Quiescent Circuit Current 5 Quiescent Circuit Current 6 High Level Voltage C/E Pin Low Level Voltage Inflow Current at High Low Level Voltage SS Pin*3 Inflow Current at Low VREF Conditions ∆VREF/∆T Conditions Eff1 Conditions Eff2 Conditions fosc Conditions VLINE Conditions VLOAD Conditions IS Conditions IIN Conditions ICC Conditions IIN (off) Conditions ICC (off) Conditions IIN (ssov) Conditions ICC (ssov) Conditions VC/EH Conditions VC/EL Conditions IC/EH Conditions VSSL Conditions ISSL Conditions 60 0.5 VIN=VCC=15V 80 VSSL=0V, VIN=VCC=15V 60 80 95 VC/E=20V 0.5 VIN=VCC=14V 60 VSSL=0V, VIN=VCC=14V 80 2 0.8 VIN=VCC=15V 95 8.5 VCC=15V, IO=0A 1 VIN=15V, VC/E=0V or Open 1 VCC=15V, VC/E=0V or Open — — — — 2 VIN=VCC=15V 0.8 VIN=VCC=14V 95 VC/E=20V 0.5 2 VIN=VCC=14V 0.8 1 4 VIN=14V, VCC=5V, IO=0A, SS1=SS2=0V 8.5 VCC=14V, IO=0V, SS1=SS2=0V 1 4 1.6 10 30 ± 0.1 80 83 250 60 VIN=VCC=10 to 20V, VO=5V, IO=1A 40 1.6 VIN=VCC=15V 4 VIN=15V, VCC=5V, IO=0V, VO≤12V 8.5 10 40 1.6 VIN=VCC=14V 4 VIN=14V, VCC=5V, IO=0A, VO≤12V 8.5 VCC=14V, IO=0A 1 VIN=14V, VC/E=0V or Open 1 VIN=14V, VC/E=0V or Open VIN=VCC=15V, VO=5V, IO=0.2 to 1.5A 215 0.996 SPI-8001TW typ. 1.006 max. 1.016 min. 0.996 SPI-8002TW typ. 1.006 ± 0.1 78 81 250 30 285 60 200 30 10 max. 1.016 min. 0.966 SPI-8003TW typ. 1.006 VIN=14V, IO=0.1A ± 0.1 VIN=14V, IO=0.1A, Ta=–30 to +125°C 78 VIN= VCC=14V, VO=5V, IO=0.5A, IIN : including ICC 81 VIN=14V, VCC=5V, VO=5V, IO=0.5A, IIN : excluding ICC 400 60 40 VIN=14V, IO=0.1A, COSC=100pF VIN=VCC=9 to 18V, VO=5V, IO=1A VIN=VCC=14V, VO=5V, IO=0.2 to 1.5A max. 1.016 (Ta=25°C) Unit VIN=10V, VO=1V, IO=0.1A VIN=10V, VO=1V, IO=0.1A, Ta=–30 to +135°C VIN=VCC=15V, VO=5V, IO=0.5A, IIN: including ICC VIN=15V, VO=5V, IO=0.5A, VCC=5V, IIN: excluding ICC VIN=VCC=15V, VO=5V, IO=0.5A V mV/ °C % % kHz mV mV A mA mA µA µA mA mA V V µA V µA *1: Electrical characteristics show the characteristic ratings guaranteed when operating the ICs under the measurement conditions described in the above table. *2: Efficiency is calculated from the following formula. η (%) = VO·IO × 100 VIN·IIN *3: Pin 6 and pin 11 are the SS pins. Soft start at power on can be performed with capacitors connected to these pins. The outputs can also be turned ON/OFF with these pins. The outputs are stopped by setting the voltages of these pins to VSSL or lower. SS-pin voltages can be changed with open-collector drive circuits of transistors. When using both the soft-start and ON/OFF functions together, the discharge currents from C4 and C5 flow into the ON/OFF control transistors respectively. Therefore, limit the currents securely to protect the transistors if C4 and C5 capacitances are large. The SS pins are pulled up to the power supply in the ICs, so applying the external voltages are prohibited. ICs 59 1-1-3 DC/DC Converter ICs ■External Dimensions (HSOP16) 1+0.1/–0.05 (Heatsink thickness) 10.5±0.2 16 9 1.35±–0.2 (Between the root of leads and back side) (Unit : mm) 0 to 0.1 2.0+0.2/–0.08 10.5±0.3 0 to 8° 2.75MAX 1 8 2.5±0.2 Enlarged View of A A 0.25+0.15/–0.05 S 12.2±–0.2 (Gate remains: Not included in dimensions) (11) 0.10 S 16 9 Pin Assignment (SPI-8001TW, SPI-8002TW) q AGND o AGND !0 VREF2 w VIN1 e VCC !1 SS2 r SWout1 !2 DGND2 t DGND1 !3 SWout2 y SS1 !4 C/E !5 VIN2 u VREF1 i N.C !6 N.C (2) 0.9±0.3 Pin Assignment (SPI-8003TW) q AGND w VIN1 e VCC r SWout1 t DGND1 y SS1 u VREF1 i COSC o !0 !1 !2 !3 !4 !5 !6 AGND ROSC VREF2 SS2 DGND2 SWout2 C/E VIN2 1.27±0.25 (4.5) 0.4+0.15/–0.05 7.5±0.2 Product Mass : Approx.0.86g ■Block Diagram VIN + + VIN 3 VCC 3 VCC SPI-8001TW/SPI-8002TW C1 C6 SPI-8003TW C1 C4 VC/E 14 C/E 3V Start VREF 1V PReg OSC RESET fdown TSD UVLO VC/E 15 C/E 3V Start VREF 1V PReg OSC RESET fdown TSD UVLO 10 VIN1 Rosc VIN1 Cosc 2 R7 8 2 f down cut 3V OCP C9 f down cut SS1 + – + 3V OCP 6 R5 C4 7 SS1 + + – + – – PWM Logic – Drive SWOUT1 DGND1 VIN2 4 5 15 6 L1 Di1 + VO1 C2 R1 R2 C7 R5 7 C5 VREF1 PWM Logic – + – – Drive SWOUT1 DGND1 VIN2 4 5 16 L1 Di1 + VO1 C2 R1 R2 C7 VREF1 Buffer-Amp Amp PWM Buffer-Amp Amp PWM f down cut AGND 3V OCP f down cut AGND 3V OCP 11 R6 C5 10 SS2 VREF2 + – + – + – – PWM Logic Buffer-Amp Amp PWM Drive SWOUT2 13 12 12 L2 Di2 DGND2 + SS2 VREF2 + – – + + – – VO2 C3 C8 R6 11 PWM Logic Buffer-Amp Amp PWM Drive SWOUT2 14 13 L2 Di2 + VO2 C3 C8 AGND C6 AGND 1, 9 R3 R4 AGND DGND2 AGND 1, 9 R3 R4 60 ICs SPI-8001TW/SPI-8002TW/SPI-8003TW ■Typical Connection Diagram VIN 3 VCC 2 VIN1 Ch1 VREF1 5 DGND1 SPI-8000TW 15 VIN2 SWout2 13 V02 L2 11 R6 SS2 Ch2 10 Di2 R3 + VC/E 14 C/E SWout1 4 L1 V01 Di1 R1 + VIN 3 VCC 2 VIN1 Ch1 VREF1 5 DGND1 SPI-8003TW 16 VIN2 SWout2 14 7 15 C/E SWout1 4 L1 VC/F VC1 Di1 R1 + 6 R5 SS1 6 C2 C7 7 SS1 R5 C2 IREF1 R2 C7 IREF1 R2 C4 + C5 + C6 C1 C4 C1 VC2 L2 Di2 R3 + 12 C3 C8 SS2 VREF2 Ch2 12 R6 VREF2 11 DGND2 AGND 1, 9 IREF2 13 C3 DGND2 AGND 1, 9 8 C9 CORC RCSC 10 R7 IREF2 R4 C8 R4 C5 GND C6 GND C1 C2, C3 C4, C5 C6, C7, C8 : 220 µF/50V : 470 µF/25V : 1 µF : 0.1 µF R5, R6 L1, L2 Di1, Di2 (Sanken) : 1kΩ : 47 µH : SJPB-H6 GND GND C1 C2, C3 C4 C5, C6 C7, C8 : 220 µF/50V : 470 µF/25V : 1 µF/50V : 1 µF/10V : 0.1 µF/50V C9 L1, L2 R2, R4 R5, R6 Di1, Di2 : 100pF/10V : 47 µH : 1kΩ : 1kΩ : SJPB-H6 (Sanken) Diodes Di1, Di2 • Be sure to use Schottky-barrier diodes for Di1 and Di2. If other diodes like fast recovery diodes are used, IC may be destroyed because of the reverse voltage generated by the recovery voltage or ON voltage. Choke coils L1, L2 • 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 2.0A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to overload or short-circuited load. • Use a closed-magnetic-path coil to prevent interference between the channels SWout1 and SWout2. Capacitors C1, C2, C3 • As large ripple currents flow through C1, C2 and C3, use high-frequency and low-impedance capacitors suitable for switching mode power supplies. Especially when the impedance of C2 and C3 are high, the switching waveforms may become abnormal at low temperatures. For C2 and C3, do not use capacitors with extremely low equivalent series resistance (ESR) such as OS capacitors or tantalum capacitors, which may cause abnormal oscillation. Resistors R1, R2, R3, R4 • R1, R2, R3 and R4 are resistors for setting output voltages. Set the resistors so that IREF is approx. 1 mA. For example, R1 and R2 can be calculated as shown below. R1= (VO1–VREF1) (VO1–V) VREF1 1 . =1(KΩ) = (Ω), R2= = 1×10–3 IREF1 1×10–3 . IREF1 To create the optimum operating conditions, place the components as close as possible to each other. ■Ta-PD Characteristics 3.5 θ j-a (Copper Laminate Area) 35.8°C/W (30.8 cm2) 3.0 38.2°C/W (15.6 cm2) 42.6°C/W (8.64 cm2) Power Dissipation PD (W) PD = VO·IO 2.5 52.3°C/W (3.34 cm2) 100 VO –1 – VF·IO 1– ηχ VIN 2.0 69.2°C/W (0.84 cm2) 1.5 1.0 0.5 0.0 –25 VO : VIN : IO : ηχ : VF : Output Voltage Input Voltage Output Current Efficiency (%) D1 Forward Voltage SJPB-H6···0.45V (IO=1A) 0 25 50 75 100 125 135 150 Ambient Temperature Ta (°C) Note 1: The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. Note 2: Thermal design for D1 must be considered separately. ICs 61