KB3301 Step-up DC/DC converter General Description Features The KB3301 is a small, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation. The low start-up input voltage below 0.8V makes KB3301 suitable for 1 to 4 battery cells applications of providing up to 300mA output current. The 500KHz high switching rate minimized the size of external components. Besides, the 14µA low quiescent current together with high effic- ƹ 90% Efficiency ƹ High Supply Capability to Deliver 5.0V 500mA with input 3.6V-4.2V ƹ 14µA Quiescent (switch-off) Supply Current ƹ 500KHz Fixed Switching Frequency ƹ Zero Shutdown Mode Supply Current ƹ Providing Flexibility for Using Internal and External Power Switches ƹ 1.0V Low Start-up Input Voltage ƹ Small SOT-26 & SOT89-5 Package iency maintains long battery lifetime. The KB3301 is available in small package SOT-26 and 䂓 Ordering Information SOT89-5 Applications ƹ ƹ ƹ ƹ ƹ ƹ Item KB3301MR KB3301PR Package SOT-26 SOT-89-5 Shipping 3000pcs/Reel&Tape 3000pcs/Reel&Tape 䂓 Package Information LCD Panel DSC MP3 Wireless Equipment Portable Instrument PDA SOT89-5 Typical Application Circuit L1 Vin C3 100uF 1N5819 C2 1uF VDD EXT 䂓 Pin Configurations 3.3~10uH + CE D1 SOT-26 1 2 3 4 5 6 Vout R1 3.3V/5V 1.6M/100K LX KB3301 + FB GND SOT-26 R2 C1 100uF 980k/33K Note:Vin=3.6~4.2V, Vout=5.0V 500mA ( USB host application ) P1 / 5 SOT-89-5 Pin NamePin Function 1 CE Chip enable EXT Output 5 GND Ground 4 LX Switching 2 VDD Input 3 FB Feedback input 1.25V KB3301 Function Block Diagram KB3301 Marking Information 㽲 㽳 㽴㽵 Test Circuit Symbol Descripation Step-up DC-DC Converter 㪈 KB3301 3 Control Code 01 i Vin I(V ) L1 ˔n 10uH + C3 100uF I(VDD) ˔ C2 1uF LX KB3301 EXT GND SOT-26 SOT-89-5 P2 / 5 1N5819 Vout 3.3V/5V R3 100 VDD CE D1 + C4 R1 C1 1.6M/100K 102uF 100uF FB R2 980K/33K C5 106uF KB3301 ABSOLUTE MAXIMUM RATINGS Paramenter Supply Voltage LX Pin Switch Voltage Other I/O Pin Voltages Lx Pin Switch Current EXT Pin Driver Current Package Thermal Resistance SOT-26 SOT-89-5 Operating Junction Temperature Storage Temperature Range (Ta=25㷄 㷄䋩 Symbol Ratings Vin - 0.3V 䌾 7V - 0.3 䌾 (VDD + 0.8V) 㪭㪣㪯 - 0.3V 䌾 (VDD + 0.3V) 㪭㫊㫊 2.5 㪠㪣㪯 200 㪠㪜㪯㪫 Pd 145 45 Tj 125 - 65 ~ +150 㪫㫊㫋㪾 Unit V V V A mA 㷄/W 㷄/W 㷄 㷄 ELECTRICAL CHARACTERISTICS (Vin =1.5V, VDD=3.3V, I=0, Ta = 25ć, unless otherwise spec Parameter Start-UP Voltage Operating VDD Range No Load Current I (VIN) Switch-off Current I (VDD) Shutdown Current I (VIN) Feedback Reference Voltage Switching Frequency Maximum Duty LX ON Resistance Current Limit Setting EXT ON Resistance to VDD EXT ON Resistance to GND Line Regulation Load Regulation CE Pin Trip Level Temperature Stability for Vout Thermal Shutdown Thermal Shutdown Hysterises Symbol VST VDD INO LOAD ISWITCH OFF IOFF VREF FS DMAX ILIMIT ƸVLINE ƸVLOAD Test Conditions IL = 1mA VDD pin voltage VIN = 1.5V, VOUT = 3.3V VIN = 6V CE Pin = 0V, VIN = 4.5V Close Loop, VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V VIN = 1.5 ~ 2.5V, IL = 1mA VIN = 2.5V, IL = 1 ~ 100mA VDD = 3.3V TS TSD ƸTSD Min -2 ---1.225 --------0.4 ---- Typ 0.80 -75 14 0.01 1.25 500 95 0.3 2 5 5 10 0.25 0.8 50 165 10 Max 0.85 6.5 --1 1.275 --------1.2 ---- Units V V µA µA µA V KHz % Ω A Ω Ω mV/V mV/mA V ppm/ć * Note: The CE pin shall be tied to VDD pin and inhibit to act the ON/OFF state whenever the VDD pin voltage may reach to 5.5V or above. P3 / 5 ć ć KB3301 Application Note Applications 䃂 High Current Application L1 3.3--10uH Vin VOUT1 = (1 + 1N5819 C2 1uF VDD Q1 NMOS GND + C1 100uF LX FB R2 980k/33K recommended. ƹ Lower R gives better noise immunity, and is less sensitive to interference, layout parasitics, FB node leakage, and improper probing to FB pins. C1=47uF C2=10uF L1 4.7uH 2.5A D1 C3=NC R1=860K/620K/210K R2=100K/100K/39K RM=0.2 CVDD=1uF 1N5819 RVDD 47 CVDD VDD CE Q1 NMOS 12V / 9V / 8V 1000mA EXT LX KB3301 GND 䊶䊶䊶㪘 NMOS= XP161A1355PR FDN337N Vin=3.1VД6.5V Vout=12V Vin=2.8V~ 6.5V Vout=9V Vin=4.0VД6.5V Vout=8V C4 47uF ) × 1.25V ƹ Follow Equation A ƹ Higher R reduces the quiescent current (Path current =1.25V/R2), however resistors beyond 5MΩ are not ƽ High Voltage Application + R1 R2 䃂 Feedback Loop Design Referring to application circuits, The selection of R1and R2 based on the trade-off between quiescent current consumption and interference immunity is stated below: R1 1.6M/100K EXT KB3301 CE Vout 3.3V/5V D1 + C5 100uF 䃂 Output Voltage Setting Referring to application circuits, the output voltage of the switching regulator (VOUT) can be set R1 C3 FB ˥ˠ R2 + C2 C1 ƹ A proper value of feed forward capacitor parallel with R1 can improve the noise immunity of the feedback loops, especially in an improper layout. An empirical suggestion is around 0~33pF for feedback resistors of MΩ, and 10nF~0.1µF for feedback resistors of tens to hundreds KΩ. For applications without standby or suspend modes, lower values of R1 and R2 are preferred. For applications concerning the current consumption in standby or suspend modes, the higher values of R1and R2 are feedback needed. Such "high impedance loops" are sensitive to any interference, which require careful layout and avoid any interference, e.g. probing to FB pin. ƽ Multi-Output Applications R1=620K R2=100 C6=0.1uF D1 Vin 3.3V/5V 1N5819 L1 3.3--10uH R3 100 C2 10uF Vout2 +18V 10mA C3 10uF C8 1uF Q1 NMOS C1 1uF C4 10uF C7 1uF VDD CE EXT KB3301 LX GND FB C6 R1 Vout1 +9V 100mA Vout3 -9V 10mA C5 10uF R2 P4 / 5 KB3301 PACAGE DESCRIPTION 䃂 SOT-89-5 Symbol A b B b1 C C1 D D1 e H Units: mm Min Max 1.400 1.600 0.360 0.520 2.400 2.600 0.406 0.533 -4.250 0.800 -4.400 4.600 -1.700 1.400 1.600 0.380 0.430 Symbol A A1 B b C D e H L Units: mm Min Max 0.889 1.295 -0.152 1.397 1.803 0.356 0.559 2.591 2.997 2.692 3.099 0.838 1.041 0.102 0.254 0.356 0.610 䃂 SOT-26 1301 P5 / 5