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| YB1693 2A / 150KHz Buck DC-DC Converter Description YB1693 Series are step-down switching regulators with all required active functions. It is capable of driving 2A load with excellent line and load regulations. These devices are available in fixed output voltages of 3.3V, 5V and an adjustable output version. YB1693 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. It substantially not only reduces the area of board size but also the size of heat sink, and in some cases no heat sink is required. The 4% tolerance on output voltage within specified input voltages and output load conditions is guaranteed. Also, the oscillator frequency accuracy is within 10%. External shutdown is included. Featuring 70A (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Features Output Voltage: 3.3V, 5V & Adjustable version Adjustable Output Voltage Range 1.23V~19.5V 4% 150KHz 15% fixed switching frequency Voltage Mode Non-synchronous PWM control Thermal Shutdown and Current Limit Protection ON/OFF Shutdown Control Input Soft-start (SS) Function Short Circuit Protect (SCP) Operating Voltage Can be up to 24V Output Load Current 2A Low Power Standby Mode Applications Simple High-efficiency Step down Regulator On-Card Switching Regulators Typical Application Circuit Figure 1: Typical Application Circuit YB1693 MRev.1.0 www.yobon.com.tw 1 YB1693 2A / 150KHz Buck DC-DC Converter Pin Configuration Figure 2: YB1693 Pin Configuration Pin Description Table 1 NAME VIN SW FB Description This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Internal switch. The voltage at this pin switches between (+Vcc - Vsat) and approximately - 0.5V, with a duty cycle of approximately Vout / Vcc. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be minimized. Sense the regulated output voltage to complete the feedback loop. Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 100uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of Vcc) shuts the regulator down. If this shutdown feature is not needed, the EN pin can be wired to the ground pin. Circuit ground EN GND Ordering Information Table 2 Order Number YB1693-33 YB1693-50 YB1693-ADJ Package Type SOP-8 SOP-8 SOP-8 Supplied as 2500 units Tape & Reel 2500 units Tape & Reel 2500 units Tape & Reel Package Marking YB1693-33 YB1693-50 YB1693-ADJ YB1693 MRev.1.0 www.yobon.com.tw 2 YB1693 2A / 150KHz Buck DC-DC Converter Absolute Maximum Ratings Supply Voltage............................................. +28V Operating Voltage Range ..............+4.5V to +24V SW, EN Pin Input Voltage ................. -0.3V to Vcc Feedback Pin Voltage....................... -0.3V to Vcc Power Dissipation ..................... Internally Limited Output Voltage to Ground ............................... -1V Storage Temperature Range ...... -65 to +150 Operating Temperature Range ... -40 to +125 Thermal Resistance Junction to Case JA ..............................70 / W Junction to Ambient JC .........................15 / W Note: JA is measured with the PCB copper area (need connect to GROUND pins) of approximately 1.5 in2 (Multi-layer) Electricity Characteristics Table 3 ( TA=25C, unless otherwise noted, VIN=12V for 3.3V, 5V, Adj version. ILOAD=0.2A ) Function Parameter Symbol ADJ VFB 3.3V VFB 5V VFB IFB FOSC TSS ICL FSCP VSAT VIL VIH IL IH DC IQ ISTBY SW pin = 0 SW pin = -1 Rising edge of EN on to ICL Pear Current, no outside circuit VFB =0V force driver on When current limit occurred and o VFB <0.5V, Ta = 25 C Test Conditions 4.5V VIN 24V 0.2A ILOAD 2A VIN =12V, ILOAD =2A 4.75V VIN 24V 0.2A ILOAD 2A VIN =12V, ILOAD =2A 7V VIN 24V 0.2A ILOAD 2A VIN =12V, ILOAD =2A VFB =1.3V (Adj version only) Min 1.193 1.180 76 3.168 3.135 80 4.80 4.75 84 Typ 1.23 Max 1.267 1.280 3.432 3.465 5.20 5.25 -100 173 Units V % Output Feedback Efficiency Output Feedback Efficiency Output Feedback Efficiency Feedback Bias Current Oscillator Frequency Soft-Start Time Current Limit 3.3 V % 5 V % -10 127 150 3 2.4 60 1.15 1.3 -0.1 nA KHz mS A KHz Oscillator Frequency of Short Circuit Protect Saturation Voltage ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current Maximum Duty Cycle (ON) Maximum Duty Cycle (OFF) Quiescent Current Standby Quiescent Current SW Pin Leakage Current IOUT=2A, No outside circuit VFB =0V force driver on Low (regulator ON) High (regulator OFF) VLOGIC =2.5V (OFF) VLOGIC =0.5V (ON) VFB =0V force driver on VFB =12V force driver off VFB =12V force driver off ON/OFF pin=5V VIN =24V No outside circuit, VFB =12V force driver off VIN =24V 2.0 1.50 0.6 -0.5 -0.01 V V A 100 0 4 45 8 100 100 -200 -5 % mA A ISWL A mA YB1693 MRev.1.0 www.yobon.com.tw 3 YB1693 2A / 150KHz Buck DC-DC Converter Electrical Characteristics Curve Vout vs. Vin Quiescent Current vs. Vin Frequency vs. Vin Frequency vs. Temperature Feedback Voltage vs. Temperature Quiescent Current vs. Temperature YB1693 MRev.1.0 www.yobon.com.tw 4 YB1693 2A / 150KHz Buck DC-DC Converter Threshold Voltage vs. Temperature ON/OFF Current vs. voltage Output Voltage vs. Temperature Feedback Current vs. Temperature Efficiency (Vin=12V, Vo=3.3V) Efficiency (Vin=12V, Vo=5V) YB1693 MRev.1.0 www.yobon.com.tw 5 YB1693 2A / 150KHz Buck DC-DC Converter Functional Block Figure 3: YB1693 Block Diagram Typical Applications Figure 4: Adjustable Output Voltage Version Resistor select for output voltage setting Vout R1 R2 4.7K 1.5K 5V 5.6K 1.8K 2.5K 1.5K 3.3V 3.0K 1.8K 2.5V 1.8K 1.8K 1.8V 0.82K 1.8K YB1693 MRev.1.0 www.yobon.com.tw 6 YB1693 2A / 150KHz Buck DC-DC Converter Figure 5: Fixed Output Voltage Version Figure 6: Adjustable Output Voltage Version with Delayed Startup Figure 7: Inverting -5V Regulator with Delayed Startup YB1693 MRev.1.0 www.yobon.com.tw 7 YB1693 2A / 150KHz Buck DC-DC Converter Package Description SOP-8 SOP-8 DIMENSION DIM A B C D F G K M P R MILLIMETERS MIN 4.80 3.80 1.35 0.35 0.40 MAX 5.00 4.00 1.75 0.49 1.25 INCHES MIN 0.189 0.150 0.054 0.014 0.016 MAX. 0.196 0.157 0.068 0.019 0.049 1.27BSC 0.10 0 5.80 0.25 0.25 7 6.20 0.50 0.05BSC 0.004 0 0.229 0.010 0.009 7 0.244 0.019 YB1693 MRev.1.0 www.yobon.com.tw 8 |
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