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| YB1696 150KHz, 3A PWM Buck Switching Regulator Description The YB1696 series are monolithic integrated circuits that provide all the active functions for a step-down DC/DC converter, capable of driving a 3A load without additional transistor component. Requiring a minimum number of external component, the board space can be saved easily. The external shutdown function can be controlled by TTL logic level and then come into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. The YB1696 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 5V and an adjustable type. The package is available in a standard 5-lead TO-263(S). Features 5V and adjustable output versions Adjustable version output voltage range, 1.23V to 28V +4% max over line and load condition Available in TO263-5L packages Voltage mode non-synchronous PWM control Thermal-shutdown and current-limit protection ON/OFF shutdown control input Input voltage range up to 32V Output load current: 3A 150 KHz fixed frequency internal oscillator Low power standby mode Built-in switching transistor on chip Applications Simple High-efficiency step-down regulator Efficient preregulator for linear regulators On-card switching regulators Positive to negative converter Battery charger Typical Application Circuit YB1696 MRev.1.1 www.yobon.com.tw 1 YB1696 150KHz, 3A PWM Buck Switching Regulator Pin Configuration Pin Description Table 1 Pin Name VIN OUTPUT GND FB SD Operating voltage input Switching output Ground Pin Function Output voltage feedback control ON/OFF Shutdown YB1696 MRev.1.1 www.yobon.com.tw 2 YB1696 150KHz, 3A PWM Buck Switching Regulator Ordering Information YB1696-50 YB1696-ADJ : For Fixed Output Voltage of 5.0V : For External Adjustable Version Marking Information YB1696-50 YB1696-ADJ : For Fixed Output Voltage of 5.0V : For External Adjustable Version Absolute Maximum Ratings Symbol VCC VSD VFB VOUT PD TST TOP VOP Parameter Supply Voltage ON/OFF Pin input voltage Feedback Pin voltage Output voltage to Ground Power dissipation Storage temperature Operating temperature Operating voltage Rating +34 -0.3 to +25 -0.3 to +25 -1 Internally limited -65 to +150 -40 to +125 +4.5 to +25 Unit V V V V W o o C C V YB1696 MRev.1.1 www.yobon.com.tw 3 YB1696 150KHz, 3A PWM Buck Switching Regulator Electrical Characteristics Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version. ILOAD=0.3A Symbol IB FOSC VSAT DC ICL IL IQ ISTBY VIL VIH IH IL JC JA Parameter Feedback current Conditions V =1.3V bias FB (Adjustable version only) Min. Typ. 40 Max. 60 100 173 173 1.4 1.5 Unit nA Khz V % oscillator frequency IOUT=3A saturation voltage no outside circuit VFB=0V force driver on Max. Duty Cycle(ON) VFB=0V force driver on V =12V force driver Min. Duty cycle(OFF) FB off peak current current limit no outside circuit VFB=0 force driver on no outside circuit Output Output = 0 leakage VFB=12 force driver off Output = 1 current VIN=32V Quiescent Current VFB=12 force driver off Standby Quiescent Current ON/OFF pin logic input threshold voltage 127 110 150 1.3 100 0 3.6 4.5 5.5 6.5 200 A uA mA mA uA V 2 5 150 2.0 1.3 15 0.02 3.5 23 ON/OFF pin=5V VIN=24V Low (regulator ON) High (regulator OFF) VLOGIC=2.5V (OFF) 60 10 250 300 0.6 25 5 o ON/OFF pin logic input current Thermal Resistance Thermal Resistance With copper area of approximately 3 in2 uA C/W C/W ON/OFF pin input current VLOGIC=0.5V (ON) Junction to case Junction to ambient o YB1696 MRev.1.1 www.yobon.com.tw 4 YB1696 150KHz, 3A PWM Buck Switching Regulator Symbol VFB Parameter Output Feedback Efficiency Output voltage Efficiency Conditions 5V < VIN < 32V 0.2A < ILOAD < 3A VOUT programmed for 3V VIN = 12V, ILOAD=3A 8V < VIN < 32V 0.2A < ILOAD < 3A VIN = 12V, ILOAD=3A Typ. 1.23 73 5 80 Limit 1.193/1.18 1.267/1.28 Unit V VMIN VMAX % V VMIN VMAX % YB1696_ADJ VOUT YB1696_50 4.8/4.75 5.2/5.25 YB1696 MRev.1.1 www.yobon.com.tw 5 YB1696 150KHz, 3A PWM Buck Switching Regulator Typical Characteristics Typical Performance Characteristics Normalized Output Voltage 5.10 OUTPUT VOLTAGE CHANGE VIN =20V, I LOAD=3A Normalized at TJ=25oC Efficiency 100 EFFICIENCY (%) 5.05 95 90 85 80 75 3A Load 5.00 5V 4.95 3.3V 4.90 -50 -25 0 25 50 75 100 125 70 8 10 15 20 25 30 35 40 JUNCTION TEMPERATURE(oC) JUNCTION TEMPERATURE(oC) Switch Saturation Voltage 1.7 SATURATION VOLTAGE (V) Switch Current Limit 6.0 SWITCH CURRENT LIMIT (A) 1.6 1.5 1.4 1 : -40 oC 2 : 25 oC 3 : 125 oC VIN=12V, VOUT=5V 5.5 5.0 1 1.3 1.2 3 2.0 3 4 5 2 4.5 4.0 -50 -25 0 25 50 75 100 125 SWITCH CURRENT(A) JUNCTION TEMPERATURE(oC) Operating Quiescent Current 25.0 SUPPLY CURRENT (mA) Shutdown Quiescent Current 200.0 160.0 CURRENT (uA) 20.0 15.0 10.0 5.0 0.0 -50 -25 0 25 50 75 100 125 Switch ON Switch OFF 120.0 80.0 40.0 0.0 1 2 3 VON/OFF=5V 1 : -40 oC 2 : 25 oC 3 : 125 oC 20 30 40 10 JUNCTION TEMPERATURE(oC) SUPPLY VOLOTAGE (V) YB1696 MRev.1.1 www.yobon.com.tw 6 YB1696 150KHz, 3A PWM Buck Switching Regulator Minimum Operating Supply Voltage 5.0 THRESHOLD VOLTAGE (V) ON/OFF Threshold Voltage 5.0 4.0 3.0 2.0 1.0 0.0 SUPPLY VOLTAGE (V) 4.0 3.0 2.0 1.0 0.0 -50 -25 0 25 50 75 100 125 VOUT=1.23V ILOAD=120mA -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (oC) JUNCTION TEMPERATURE (oC) ON/OFF Pin Current (Sinking) 150.0 FREQUENCY (kHz) Switch Frequency 200.0 120.0 CURRENT (uA) VIN=40V -40oC TJ 125oC 150.0 90.0 60.0 30.0 0.0 1.4 5 10 15 20 22 23 24 25 ON/OFF PIN VOLTAGE (V) 100.0 50.0 0.0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (oC) Feedback Pin Bias Current 50.0 BIAS CURRENT (nA) 40.0 30.0 20.0 Adjustable Version Only 10.0 0.0 -50 -25 0 25 50 75 o 100 125 JUNCTION TEMPERATURE( C) YB1696 MRev.1.1 www.yobon.com.tw 7 YB1696 150KHz, 3A PWM Buck Switching Regulator Functional Block Diagram SD VIN 200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV + Comp _ Comp + + FB _ Comp + Typical Application Circuit YB1696 MRev.1.1 www.yobon.com.tw _ Amp Pre-driver 150kHz OSC. Thermal Limit _ 3A Switch Output Gnd 8 YB1696 150KHz, 3A PWM Buck Switching Regulator Function Description Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately - 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a minimum. Feedback Senses the regulated output voltage to complete the feedback loop. ON /OFF open, in either case the regulator will be in the ON condition. Thermal Considerations The YB1696 is available in a 5-pin surface mount TO-263. The TO-263 surface mount package tab is designed to be soldered to the copper on a printed circuit board. The copper and the board are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in2, and ideally should have 2 or more square inches of 2 oz. Additional copper area improves the thermal characteristics, but with copper areas greater than 2 approximately 6 in , only small improvements in heat dissipation are realized. If further thermal improvements are needed, double sided, multilayer PC board with large copper areas and/or airflow are recommended. The YB1696 (TO-263 package) junction temperature rise above ambient temperature with a 2A load for various input and output voltages. This data was taken with the circuit operating as a buck switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curve can be Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150uA. 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 25V) shuts the regulator down. If this shutdown feature is not needed, the ON /OFF pin can be wired to the ground pin or it can be left YB1696 MRev.1.1 www.yobon.com.tw 9 YB1696 150KHz, 3A PWM Buck Switching Regulator used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multilayer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multilayer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or YB1696 MRev.1.1 moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. www.yobon.com.tw 10 YB1696 150KHz, 3A PWM Buck Switching Regulator Package Information TO263-5L E F L2 A C2 D L e B C Symbol A B C C2 D E e F L L1 L2 Dimensions In Millimeters Min. 4.38 0.72 0.36 1.18 8.23 9.96 1.60 6.80 15.14 2.28 1.40 Max. 4.78 0.92 0.41 1.38 8.63 10.36 1.80 7.20 15.74 2.79 1.80 Dimensions In Inches Min. 0.172 0.028 0.014 0.046 0.324 0.392 0.062 0.267 0.596 0.089 0.055 Max. 0.188 0.036 0.016 0.055 0.340 0.407 0.071 0.283 0.620 0.110 0.071 L1 YB1696 MRev.1.1 www.yobon.com.tw 11 |
Price & Availability of YB1696-ADJ
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