YB1300S Switched Capacitor Boost Converter 5V/4.5V Description Features 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 0.1μA. The YB1300S is available in a 6-pin SOT23 package. 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 3 CIN 2.2uF 2 VIN YB1300S 1 VOUT EN CP 6 GND CN 4 R R R R R COUT 2.2uF CPUMP 0.22uF Figure 1: Typical Application Circuit YB1300S Rev.1.2 www.yobon.com.tw 1 YB1300S Switched Capacitor Boost Converter 5V/4.5V Pin Configuration VOUT 1 6 CP GND 2 5 VIN EN 3 4 CN SOT23-6 Figure 2: Pin Configuration Pin Description Table 1 Pin Name Description 1 VOUT Regulated output voltage. VOUT should be bypassed with a low ESR capacitor for the best performance. 2 GND Ground pin. 3 EN 1.2V or above will turn on the IC. Below 0.4V will put the chip in the shutdown mode. 4 CN Pumping capacitor negative terminal. 5 VIN Input supply voltage. VIN should be bypassed with a 2.2μF low ESR capacitor. 6 CP Pumping capacitor positive terminal. Ordering Information Order Number Package Type Supplied As Package Marking YB1300ST26S450 SOT23-6 3000 Units Tape & Reel TBB YB1300ST26S500 SOT23-6 3000 Units Tape & Reel TBA YB1300S Rev.1.2 www.yobon.com.tw 2 YB1300S Switched Capacitor Boost Converter 5V/4.5V Recommended Operating Conditions Absolute Maximum Ratings (Note 1) Supply Voltage.......................................5.5V Output Voltage .......................................5.5V Output Short-Circuit Duration...... Continuous Junction Temperature Range.............. 125°C Storage Temperature Range...... -65°C to 150°C Lead Temperature............................... 250°C ESD HBM (Human Body Mode) ........... 2KV ESD MM (Machine Mode).....................200V (Note 2) Input Supply Voltage.................. 2.7V to 5V Operating Temperature.........-40°C to 85°C Thermal Information (Note 3) SOT23-6 θJA………………………. .220℃/W Note: 1. Exceeding these ratings may damage the device. 2. The device is not guaranteed to function outside of its operating conditions. 3. θJA is measured in free air at TA = 25℃ on a low effective thermal conductivity board. Electrical Characteristics Table 2 (VIN = 3.2V, IOUT = 10mA, CIN = COUT =2.2μF, CPUMP = 0.22μF, VEN = VIN, TA=25°C, unless otherwise noted.) Description Input Voltage Symbol Test Conditions VIN MIN TYP 2.7 Output Voltage VOUT VIN = 3.3V, IOUT = 60mA 4.8 Maximum Output Current IOUT VIN = 3.2V 100 Short Circuit Current ISC VIN = 4.5V Oscillator Frequency FOSC 5.0 MAX Units 5.0 V 5.2 V 250 mA 80 0.8 1 mA 1.2 MHz Efficiency η IOUT = 20mA, VIN =2.7V 90 % Ripple Voltage VR VIN =3.4V, IOUT =60mA 35 mVPP Enable Control (High) VIH VIN = 5.0V 1.2 VIN V Enable Control (Low) VIL VIN = 5.0V -0.2 0.4 V Thermal Shutdown TST Shutdown Temperature 160 ℃ Thermal Recovery TRT Recovery Temperature 140 ℃ Supply Current (Quiescent) IQC VIN = 3.4V, IOUT = 0mA 1 mA Supply Current (Shutdown) ISD VIN = 2.7 to 5.0V, Enable = 0V 0.1 μA YB1300S Rev.1.2 www.yobon.com.tw 3 YB1300S Switched Capacitor Boost Converter 5V/4.5V Typical Performance Characteristics VIN = 3.2V, IOUT = 10mA, CIN = COUT =2.2μF, CPUMP = 0.22μF, VEN = VIN, TA=25°C, unless otherwise noted. Output Voltage vs. Output Current Output Voltage vs. Input Voltage Efficiency vs. Output Current Output Ripple with IOUT = 60mA YB1300S Rev.1.2 Input Short-Circuit Current vs. Input Voltage Output Ripple vs. Output Current www.yobon.com.tw 4 YB1300S Switched Capacitor Boost Converter 5V/4.5V Output Ripple with IOUT = 100mA Inrush Current and Start Up Time Inrush Current and Start Up Time Normal Operation YB1300S Rev.1.2 Normal Operation Output Voltage vs. Output Current www.yobon.com.tw 5 YB1300S Switched Capacitor Boost Converter 5V/4.5V Function Block Cpump CN 4 6 CP Short-Circuit Protection VIN Soft-Start Circuit VOUT 5 1 BOOST DRIVER CIN Current Bias Generator EN 3 Chip Enable COUT Boost Feedback & Timing Control Block 1MHz Oscillator Thermal Protection VREF 2 GND Figure 3: Function Block Function 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 limit inrush current at turn-on. When starting up, the output capacitor is charged YB1300S Rev.1.2 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 the device when the junction temperature reached approximately 160℃, allowing the device to cool. When the junction temperature cools to approximately 140℃, www.yobon.com.tw 6 YB1300S Switched Capacitor Boost Converter 5V/4.5V 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. Layout Consideration Figure 4: Top Layer 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 ensure proper regulation under all conditions. Figure 4 and Figure 5 show the recommended layout configuration. YB1300S Rev.1.2 www.yobon.com.tw Figure 5: Bottom Layer 7 YB1300S Switched Capacitor Boost Converter 5V/4.5V Package Information (SOT23-6) L2 L1 GAUGE PLANE t L C NOTICE: y The information described herein is subject to change without notice. y Yobon does not assume any responsibility for use of any circuitry or applications described herein, nor does it convey any patent license. YB1300S Rev.1.2 www.yobon.com.tw 8