Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Step-Up DC-DC Converter Features General Description The kB2301 Series are PFM step-up DC-DC converters with very low ripple noise due to the high operation frequency. The maximum operation frequency is 400KHz. Only three components are required to realize the conversion from the battery voltage to a selected output voltage. A driver pin (EXT) is provided for driving external power transistor to extend the output current capability where large current is required. Enable pin (EN) is also provided so that the circuit can be powered down. Applications y Power source for applications where a higher voltage than the battery voltage is required y One to three cell battery devices y Power source for cameras, camcorders, VCRs, PDAs, pagers and hand held communication instrument Ordering Information KB ; y 400KHz Maximum Operation Frequency y 2.0V to 5.0V Output Voltage With 0.1V Step y Low Start-up Voltage: 0.8V at 1mA y 2% Output Voltage Accuracy y Up to 88% Efficiency y Output current: 300mA at 2.5V input, 3.3V output y Low Ripple and Low Noise y Output Current Extendable by External Switch ; ; ; Package Type: T: SOT-23-3 F: SOT-23-5 E: SOT-89 Output Voltage: 20: 2.0V 21: 2.1V Ă 49: 4.9V 50: 5.0V External switch E: use external switch L: use internal switch Typical Applications / / X+ X+ 1 9,1 &E X) 9,1 /; 9287 *1' 9287 & X) 1 (;7 =7; 5E 9287 *1' 9287 & X) 1 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Block Diagram /; (;7 &XUUHQW OLPLWLQJ FRPSDUDWRU EXIIHU (UURU $PSOLILHU 3)0 FRQWURO FB(5V only) 2.15V 26& .+] &KLS (QDEOH (1 9287 EDQGJDS *1' Pin Assignment Pin Name Part Marking and Package Type Description kB2301 kB2301 kB2301 kB2301 kB2301 kB2301 LXXT LXXF LXXE EXXT EXXF EXXE SOT-23-3 SOT-23-5 SOT-89 SOT-23-3 SOT-23-5 SOT-89 LX 2 5 3 - - - Switching pin EXT - - - 2 5 3 Buffer output for external transistor VOUT 3 2 2 3 2 2 Output voltage EN - 1 - - 1 - Chip enable (active high) GND 1 4 1 1 4 1 Ground FB - 3 - - 3 - 5V only 9287 /; *1' kB2301LXXT 627 *1' kB2301LXXF 627 /; (1 9287 9287 *1' FB(5V only) (;7 *1' kB2301EXXT 627 kB2301LXXE 627 kB2301EXXF 627 (;7 (1 9287 *1' 9287 /; kB2301EXXE 627 FB(5V only) *1' 9287 (;7 2 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Absolute Maximum Ratings Type Symbol Description Value Unit Voltage Vmax Maximum voltage on VOUT and VLX pins 8 V Vmin-max Voltage range on EXT and EN pins -0.3-VOUT+0.3 V ILXmax Maximum current on LX pin 1000 mA IEXTmax Maximum current on EXT pin 100 mA Psot-23-3 Maximum Power dissipation for SOT-23-3 package 0.25 W Psot-23-5 Maximum Power dissipation for SOT-23-5 package 0.25 W Psot-89 Maximum Power dissipation for SOT-89 package 0.5 W Tmin-max Operation temperature range -20-85 o C Tstorage Storage temperature range -40-165 o C VESD ESD voltage for human body mode 2000 V Current Power dissipation Thermal ESD Electronic Characteristics Parameter Symbol Test Condition Min Output voltage accuracy ƸVOUT Maximum input voltage VINMAX Start-up voltage VSTART ILOAD=1mA, VIN:0ė2V Hold-on voltage VHOLD ILOAD=1mA, VIN:2ė0V Maximum oscillation frequency FMAX 350 400 450 KHz Oscillator duty cycle DCOSC 75 80 85 % Efficiency ¨ 85 88 % Current limit ,/,0,7 Max Unit -2 2 % 0.7 VOUT V 0.85 V 800 1000 mA Input current at no load ,,1 0.6 600 VIN=1.8V VOUT=3.0V Typ V 20 uA VIN=1.8V VOUT=5.0V VOUT pin current at switch off ,287 Drive VOUT pin with voltage VOUT+0.5V Input standby current ,,14 No load, EN=“low” uA 6 8 uA 1 uA 3 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 V EN “High” voltage level EN “low” level 0.2 V EN “high” input current 0.1 uA EN “low” input current -0.1 EXT output current -5 0.4VOUT uA 5 mA 4 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Typical Characteristics (Using Internal Switch Transistor) 6WDUWXS+ROGRQ9ROWDJH9 Start-up/Hold-on vs. Output Current 6WDUWXS L=47uH C=47uF +ROGRQ Output Current(mA) Output Voltage vs. Output Current 2XWSXW9ROWDJH9 9 9 9 9 9 L=47uH C=47uF VOUT=3.4V Output Current (mA) 5 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 (IILFLHQF\ Efficiency vs. Output Current 9 9 9 9 9 L=47uH C=47uF VOUT=3.4V Output Current(mA) Output Current vs. Ripple Voltage 5LSSOH9ROWDJHP9 9 9 9 L=47uH C=47uF VOUT=3.4V 9 9 Output Current (mA) 6 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 Output Current vs. Ripple Voltage 5LSSOH9ROWDJHP9 9 9 9 9 9 L=47uH C=2*47uF VOUT=3.4V Output Current (mA) Output Current vs. Ripple Voltage 5LSSOH9ROWDJHP9 9 9 9 L=47uH C=3*47uF VOUT=3.4V 9 9 Output Current (mA) 7 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 KB2301 Package Information 6\PERO $ $ $ % F ' ( ( H H / / " 'LPHQVLRQV,Q0LOOLPHWHUV 0LQ 0D[ 7<3 5() ٛ ٛٛ 'LPHQVLRQV,Q,QFKHV 0LQ 0D[ 7<3 5() ٛ 8 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 6\PERO $ $ $ E F ' ( ( H H / / " 'LPHQVLRQV,Q0LOOLPHWHU 0LQ 0D[ 7<3 5() ٛ ٛ ٛ KB2301 'LPHQVLRQV,Q,QFKHV 0LQ 0D[ 7<3 5() ٛ 9 Kingbor Technology Co.,Ltd KB2301 TEL:(86)0755-26508846 FAX:(86)0755-26509052 6\PERO $ E E F ' ' ( ( H H / 0LQ 0D[ 0LQ 5() 5() 7<3 7<3 0D[ 7<3 7<3 10