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| YB1300S Switched Capacitor Boost Converter 5V/4.5V Description The YB1300S is a switched capacitor DC/DC boost converter that produces a regulated 5V output. The input voltage range is from 2.7V to 5.0V that makes the YB1300S ideally for a single cell Li-Ion battery source. The YB1300S works well for step-up applications without the need for an inductor. The 1MHz switching frequency allows the use of small SMD capacitors. The YB1300S provides thermal protection, short-circuit current limit protection. In order to prevent in-rush current effectively, it provides automatic soft-start. The shutdown current is less than 0.1A. The YB1300S is available in a 6-pin SOT23 package. Features Switched-Capacitor Step-Up Operation Input Range : 2.7V to 5.0V Shutdown Mode 5V/4.5V Fix Output Voltage 1MHz Internal Oscillator Thermal Protection Shutdown Output Short-circuit Current Limit Protection Automatic Soft-Start Reduces In-Rush Current SOT23-6 Package Applications Cellular Phones White LED Drivers Smart Card Reader PCMCIA Cards Li-Ion Battery Backup Supplies Typical Application Circuit 5 1-Cell Li-Ion-Battery CIN 2.2uF VIN YB1300S 1 VOUT CP 6 4 CPUMP 0.22uF R COUT 2.2uF R R R R 3 EN 2 GND CN Figure 1. Typical application circuit YB1300S MRev.1.0 www.yobon.com.tw 1 YB1300S Switched Capacitor Boost Converter 5V/4.5V Pin Configuration SOT23-6 TOP VIEW VOUT 1 GND 2 EN 3 6 CP 5 VIN 4 CN Figure 2. Pin configuration Pin Description Table 1 Pin 1 2 3 4 5 6 Name VOUT GND EN CN VIN CP Description Regulated output voltage. VOUT should be bypassed with a low ESR capacitor for the best performance. Ground pin. 1.2V or above will turn on the IC. Below 0.4V will put the chip in the shutdown mode. Pumping capacitor negative terminal. Input supply voltage. VIN should be bypassed with a 2.2F low ESR capacitor. Pumping capacitor positive terminal. Ordering Information Order Number YB1300ST26S500 YB1300ST26S450 Package Type SOT23-6 SOT23-6 Supplied as 3000 units Tape & Reel 3000 units Tape & Reel Package Marking TBA TBB YB1300S MRev.1.0 www.yobon.com.tw 2 YB1300S Switched Capacitor Boost Converter 5V/4.5V Absolute Maximum Ratings Supply Voltage...................................................5.5V Output Voltage ...................................................5.5V Output Short-Circuit Duration .................Continuous Junction Temperature Range ....................... +125 Storage Temperature Range .......... -65 to +150 Lead Temperature......................................... +250 ESD Susceptibility HBM (Human Body Mode) .............................. 2KV MM (Machine Mode).......................................200V Recommended Operating Conditions Input Supply Voltage................................ 2V to 5V Operating Temperature.................. -40 to +85 Electrical Characteristics At TA=25, VIN=3.2V, IOUT=10mA, CIN=COUT=2.2F, CPUMP=0.22F, VENABLE=VIN, unless otherwise noted. Table 2 Symbol VIN VOUT IOUT ISC FOSC VR VIH VIL TST TRT IQC ISC Function Parameter Input Voltage Output Voltage Maximum Output Current Short Circuit Current Oscillator Frequency Efficiency Ripple Voltage Enable Control (High) Enable Control (Low) Thermal Shutdown Thermal Recovery Supply Current (Quiescent) Supply Current (Shutdown) Test Conditions Min 2.7 Typ Max 5.0 Units V V mA mA VIN=3.3V, IOUT=60mA VIN>3.2V VIN=4.5V 4.8 100 5.0 5.2 250 80 0.8 1 90 35 1.2 -0.2 ~160 ~140 1 ~0.1 0.4 1.2 MHz % mVpp V V C C mA A IOUT =20mA, VIN=2.7V VIN=3.4V, IOUT =60mA Vin=5.0V Vin=5.0V Shutdown Temperature Recovery Temperature VIN =3.4V, IOUT =0mA VIN =2.7-5.0V, Enable=0V YB1300S MRev.1.0 www.yobon.com.tw 3 YB1300S Switched Capacitor Boost Converter 5V/4.5V Typical Characteristics At TA=25, VIN=3.2V, IOUT=10mA, CIN=COUT=2.2F, CPUMP=0.22F, VENABLE=VIN, unless otherwise noted. Output Voltage vs. Output Current 5.200 5.150 5.100 5.100 Output Voltage vs. Input Voltage 5.000 Vin=3.6V Vin=4.2V Output Voltage (V) 4.900 Output Voltage (V) 5.050 5.000 4.950 4.900 4.850 4.800 10 20 30 40 50 60 70 80 90 100 4.800 Vin=3.2V Vin=3.4V 4.700 4.600 Iout=10mA Iout=20mA Iout=30mA Iout=40mA Iout=50mA Iout=60mA Iout=70mA Iout=80mA Iout=90mA 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.500 Output Current (mA) Supply Voltage (V) Efficiency vs. Output Current 100 Input Short-Circuit Current vs. Input Voltage 100 Vin=2.7V 90 80 90 Vin=3.4V Input Current (mA) 80 70 60 50 40 30 10 20 30 40 50 60 70 80 90 100 Efficiency (%) 70 60 50 40 Vin=3.2V Vin=3.6V Vin=4.2V 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 Output Current (mA) Supply Voltage (V) Output Ripple with Iout=60mA 80 Output Ripple vs. Output Current Vin=4.2V 70 Output Ripple (mV) 60 Vin=3.8V Vout AC Coupled 10mV/div 50 40 Vin=3.0V Vin=3.2V 30 Vin=3.4V 20 0 20 40 60 80 100 120 140 160 180 200 Time=1s/div Output Current (mA) YB1300S MRev.1.0 www.yobon.com.tw 4 YB1300S Switched Capacitor Boost Converter 5V/4.5V Output Ripple with Iout=100mA Inrush Current and Start Up Time Vin (2V/div) Vout AC Coupled 10mV/div Vout EN (2V/div) (2V/div) Vin=3.8V Iin (500mA/div) Vin=4.0V, Iout=60mA Time=1s/div Time=100s/div Inrush Current and Start Up Time Normal Operation Vin (2V/div) Vout (2V/div) (2V/div) Vin (5V/div) (5V/div) (2V/div) Cn Iout Vin=3.2V, Iout=60mA (50mA/div) Vin=4.2V, Iout=100mA Vout EN Iin (500mA/div) Time=100s/div Time=1s/div Normal Operation Output Voltage V.S Output Current 5.2 2.7V Vout Vin (5V/div) 3.0V 5 (5V/div) 3.3V 3.6V V out(V ) 3.9V (2V/div) Cn Iout (50mA/div) Vin=3.2V, Iout=60mA 4.8 4.2V 4.6 4.4 Time=1s/div 0 50 100 150 200 250 300 ILoad(mA) YB1300S MRev.1.0 www.yobon.com.tw 5 YB1300S Switched Capacitor Boost Converter 5V/4.5V Functional Block Cpump CN VIN 5 Short-Circuit Protection 4 6 CP Soft-Start Circuit 1 BOOST DRIVER VOUT COUT CIN Current Bias Generator Boost Feedback & Timing Control Block EN 3 Chip Enable 1MHz Oscillator Thermal Protection VREF 2 GND Figure 3. Block Diagram Functional Description The YB1300S regulated charge pump provides a regulated 5V output voltage for input voltages between 2.7V and 5V. This is accomplished by a step-up or boost mode of operation. A conversion clock of 50% duty cycle is generated. During the first half cycle, the pumping capacitor CPUMP charges to VIN. During the second half cycle, the voltage on CPUMP is added to VIN, then deliver to VOUT. The output voltage is regulated by skipping clock cycles as necessary. Soft-Start and Short-Circuit Protection Circuitry The YB1300S includes soft-start circuitry to YB1300S MRev.1.0 limit inrush current at turn-on. When starting up, the output capacitor is charged through the charge-pump capacitor with a limited current source. When the output voltage approached to its design value, the soft-start is terminated and normal operation begins. If an overload condition occurs, for example, the output is shorted to ground, the output current is limited by the YB1300S switching technique. Thermal Protection The regulator has thermal shutdown circuitry that protects it from damage caused by high temperature conditions. The thermal protection circuitry shut down 6 www.yobon.com.tw YB1300S Switched Capacitor Boost Converter 5V/4.5V the device when the junction temperature reached approximately 160, allowing the device to cool. When the junction temperature cools to approximately 140, the device is automatically reenabled. Continuously running the regulator into thermal shutdown can degrade reliability. Shutdown Mode A control pin on the regulator can be used to place the device into an energy-saving shutdown mode. In this mode, the output is disconnected from the input. ensure proper regulation under all conditions. Figure 4 and Figure 5 show the recommended layout configuration. Figure 4. Top layer Layout Consideration Due to large transient currents and high switching frequency produced by the YB1300S, careful consideration of PCB layout is necessary. In order to minimize both input and output ripple, keep the capacitors as close as possible to the regulator using short, direct circuit traces. A ground plane and short connections to all capacitors will improve performance and Figure 5. Bottom layer YB1300S MRev.1.0 www.yobon.com.tw 7 YB1300S Switched Capacitor Boost Converter 5V/4.5V Package Information Notes: 1. Dimension D1 & E1 does not include mold protrusion. 2. Coplanarity of all lead shall be (Before test) 0.1 MAX. from the seating plane. Unless otherwise specified. YB1300S MRev.1.0 www.yobon.com.tw 8 |
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