SI-8205NHD

1-1-2 Switching Mode Regulator ICs SI-8205NHD Full-Mold, Separate Excitation Step-down Switching Mode Regulator ICs ICs Surface-Mount, Current Mode Control, Synchronous Rectifier Step-down Switching Mode Regulator ■Features • • • • • • • • • Compact surface-mount (HSOP8) package Wide input voltage range (VIN): Vo + 3 to 43 V Synchronous rectifier mode Output current: 3 A Reference voltage and accuracy of 0.5 V ± 1% Oscillation frequency: 200 kHz to 1 MHz Output can be disabled Undervoltage Lock Out Soft start function ■Absolute Maximum Ratings Parameter Symbol Ratings Unit Conditions Input Voltage (VIN Pin) Power Dissipation*1 Junction Temperature Storage Temperature Thermal Resistance (Junction to Lead ) Thermal Resistance (Junction to Ambient Air) VIN PD Tj Tstg θj-c θj-a 46 1.35 –40 to +150 –40 to +150 40 74 V W °C °C °C/W °C/W When mounted on a 30 × 30 mm glass-epoxy board (with a 25 × 25 mm copper area) When mounted on a 30 × 30 mm glass-epoxy board (with a 25 × 25 mm copper area) ■Recommended Operating Conditions Parameter ■Applications • • • • Power supply for LCD module Power supply for notebook PC Onboard local power supplies Power supply for LBP/PPC Input Voltage Range Output Current Range Output Voltage Range Operating Junction Temperature Range Operating Temperature Range Symbol VIN Io Vo Tjop Top Ratings Vo+3 to 43 0 to 3.0 0.5 to 24 –40 to +125 –40 to +85 Unit V A V °C °C ■Electrical Characteristics Parameter Reference Voltage Temperature Coefficient of Reference Voltage Efficiency Oscillation Frequency 1 Oscillation Frequency 2 Line Regulation Load Regulation Overcurrent Protection Starting Current Quiescent Circuit Current Outflow Current at Low Voltage EN/SS Pin Open Voltage On Threshold Voltage OVP Start Voltage Thermal Protection Start Temperature Error Amplifier Voltage Gain Error Amplifier Transformer Conductance Current Sense Amplifier Impedance Maximum ON Duty Minimum ON Time Symbol Vref ∆VREF/∆T η (Ta = 25°C and fo = 500kHz unless otherwise specified) min. 0.495 fo1 fo2 ∆VoLINE ∆VoLOAD Is IIN IIN(OFF) IEN/SS VSSH VC/EH Vovp Tj AEA GEA GCS DMAX DMIN Ratings typ. 0.500 ± 0.05 90 200 1 50 50 8 max. 0.505 Unit V mV/°C % kHz MHz mV mV A mA µA µA Conditions VIN=12V, Io=1.0A VIN=12V, Io=1.0A, Ta=–40 to +85°C VIN=12V, Vo=5V, Io=1.0A VIN=12V, Vo=5V, Io=1A, Rfset=375kΩ VIN=12V, Vo=5V, Io=1A, Rfset=75kΩ VIN=8 to 43V, Vo to 5V, Io=1A VIN=12V, Vo=5V, Io=0.1 to 3.0A VIN=12V, Vo=5V VIN=12V, Vcomp=0V VIN=12V, VEN/ss=0V VEN/SS=0V, VIN=12V VIN=12V VIN=12V 3.1 6.0 40 3.0 0.6 0.57 151 5 4.5 1.3 0.60 160 800 800 3.33 90 150 6.0 2.0 0.63 V V V °C V/V µA/V A/V % nsec VIN=12V VIN=12V 80 ICs SI-8205NHD ■External Dimensions (HSOP8) (Unit : mm) 4.40 6.20 Pin 1 Mark 0.695 TYP 5.20 A 1.50 Enlarged View of A 1.27 0.40 (0.52) 0.4 Pin Assignment q GND w EN/SS e VIN r FSET t COMP y FB u BS i SW Plastic Mold Package Type Flammability : UL 94V-0 Product Mass : Approx. 0.1 g 0.05±0.05 0.15 2.90 0.30 (0.55) ■Block Diagram ③VIN + REG 2.20 2.70 (0.27) 0.30 0.08±0.08 CUR_SUS DRV_REG REG_DRV REG REG OVC REG_DEV REG_DEV – REG REG_BIAS STANDBY RegOK ⑦BS STANDBY OCP_CMP VinOK BC H/S Drv Level Shift REG_UVLO M1 VIN_UVLO PWR_stage REG VinOK REG REG VinOK Set PH Fere Off Phase ⑧SW M2 GATE_logic Level Shift LSoft STANDBY REG VinOK PH Open REG OVT OSC_RAMP FSET④ Ramp FB REG Phase_ logic INIT PH INIT CC L/S Drv Res PH CUR_COMP REG LSoft BS_CHG Fere_Off Set PH RegOK VinOK REG_BIAS Control_logic OVT TSD BG REG INIT OVP OVP OVP_CMP REG SS_Ref REG BG Ref ⑥FB Err_AMP Rnf SS_Rnf EN_SS STANDBY REF ①GND ⑤COMP ■Typical Connection Diagram C1:10µF/50V×2  (murata:GRM55DB31H106KA87) C2:22µF/16V×2  (murata:GRM32ER71A226KE20) C3:270pF  (murata:GRM18 type) C4:10µF  (murata: GRM18 type) C5:1µF  (murata: GRM18 type) L1:10µH D1: SJPB-L6 (Sanken) R1:9kΩ(When Vo=5V) R2:1kΩ R3:51kΩ R4:150kΩ R5:20Ω to 47Ω VIN 3 VIN EN/SS R5 C4 7 8 BS SW 6 R1 L1 VO 2 C1 4 SI-8205NHD FSET GND 1 R4 FB COMP 5 C3 C6 Open R3 C2 GND C5 GND R2 D1 ICs 81