UNISONIC TECHNOLOGIES CO., LTD UC2306 LINEAR INTEGRATED CIRCUIT MICROPOWER DC/DC CONVERTERS WITH LOW-BATTERY DETECTOR ACTIVE IN SHUTDOWN SOP-8 DESCRIPTION The UTC UC2306 is a step-up DC/DC converter which operate from a wide input supply range of 1.5V to 8V. Its peak switch current can be reduced by adding a single resistor at the ILIM pin. It is an ideal for use in small, low voltage, battery-operated systems. FEATURES *In shutdown mode:10μA quiescent current. *Low battery detector active *Minimum Operating Voltage: 1.5V *Very Low VCESAT: 370mV@1A (typ). *In active mode :120μA quiescent current. *Only by one resistor: peak current is programmable. DIP-8 *Pb-free plating product number: UC2306L ORDERING INFORMATION Ordering Number Normal UC2306-xx-D08-T UC2306-xx-S08-R UC2306-xx-S08-T Lead Free Plating UC2306L-xx-D08-T UC2306L-xx-S08-R UC2306L-xx-S08-T www.unisonic.com.tw Copyright © 2008 Unisonic Technologies Co., Ltd Package Packing DIP-8 SOP-8 SOP-8 Tube Tape Reel Tube 1 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION LBI 1 8 FB(SENSE) LBO 2 7 SHDN VIN 3 6 ILIM SW 4 5 GND PIN DESCRIPTION PIN No. SYMBOL 1 LBI 2 3 4 5 LBO VIN SW GND 6 ILIM 7 SHDN 8 FB/SENSE DESCRIPTION Input of Low Battery Detector. Detector output is low when voltage on this pin is less than 1.17V. Output of Low Battery Detector. Input Voltage Supply. The Collector Pin of Power NPN. Ground. Pin For Current Limit Set. Connected to nothing for 1A peak switch current; and connect to a resistor to ground will lower peak current Input of Shutdown.Held low, then switching regulator is turned off. This Pin should not be float. When SHDN mode is not used, connect it to VIN This pin connects to the resistor divider. In shutdown mode,the divider is disconnected from it. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAMS R3 8 FB ENABLE A1 TIMERS 6μs ON 1.5μs OFF + R4 1.5V UNDER VOLTAGE LOCKOUT 1.24V VREF VIN 3 + DRIVER VIN C1 36mV + 2 1 - LBI L1 R1 7.2Ω A2 LBO SW R2 1K 4 + - Q1 ×200 Q2 ×1 A3 1.17V D1 Q3 BIAS -1V + 1K SHUTDOWN 7 SHDN 6 ILIM 5 VOUT C2 GND UC2306 Block Diagram. Note：A3 Remains Alive When Device Is in Shutdown UC2306-3.3/UC2306-5.0 Block Diagram UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATING UNIT Input Voltage VIN 8 V SW Voltage VSW -0.4 ~ +25 V FB Voltage(UC2306) VFB VIN+0.3 V ILIM Voltage(UC2306-3.3/UC2306-5.0) VILIM 5 V SHDN Voltage VSHDN 6 V LBI Voltage VLBI VIN V LBO Voltage VLBO 8 V Maximum Power Dissipation PD 500 mW Junction Temperature TJ 125 °C Operating Temperature TOPR -20 ~ +85 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (VIN=2V, VSHDN=2V, unless otherwise specified) PARAMETER Minimum Operating Voltage Operating Voltage Quiescent Current Quiescent Current In Shutdown SYMBOL VCC(MIN) VIN V SHDN IQ V SHDN ISD V SHDN Comparator Trip Point FB Pin Bias Current IFB Sense Pin Leakage in Shutdown ILEAK(SD) Line Regulation LBI Input Threshold LBI Bias Current LBI Input Hysteresis LBO Output Voltage Low LBO Output Leakage Current ΔVOUT VLBI(THR) ILBI (BIAS) SHDN Input Voltage ILBI (HYS) VLBO(OL) ILBO(LEAK) High Low V SHDN SHDN Pin Bias Current I SHDN Switching Off Time Switch On Time Maximum Duty Cycle tOFF tON tDUTY TEST CONDITIONS MIN =2V, Not switching(Note) =0V, VIN=2V(Note) =0V, VIN=5V(Note) (Note) (Note) V SHDN =0V, Fixed Output Versions(Note) 1.8V≤VIN≤8V (Note) Falling Edge(Note) (Note) (Note) ISINK=500µA(Note) LBI=1.5V, LBO=5V(Note) (Note) (Note) V SHDN =5V(Note) V SHDN =0V(Note) 1.22 1.10 www.unisonic.com.tw 120 7 27 1.24 10 MAX 1.65 8 200 15 50 1.26 25 0.002 1 0.04 1.17 6 35 0.2 0.01 0.15 1.25 20 65 0.4 0.1 1.4 -5 1 4 76 0.8 (Note) Current Limit Not Asserted (Note) Current Limit Not Asserted (Note) ILIM Pin Open, VIN=5V Peak Switch Current I (SW) 20K from ILIM to GND Isw=1A Switch Saturation Voltage VSW(SAT) Isw=700mA(Note) Switch Leakage ILEAK(SW) Switch off, Vsw=5V Note: Denotes specifications which apply over the 0°C to 70°C operating temperature range. UNISONIC TECHNOLOGIES CO., LTD TYP 1.5 5 -2 1.5 6 80 1 500 0.37 0.26 0.01 0.4 8 2 8 88 1.2 0.35 7 UNIT V V µA µA µA V nA µA %/V V nA mV V µA V V µA µA µs µs % A mA V V µA 4 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION Super Burst Low IQ DC/DC Converter MBRS130L 33 μ H IQ ≈ 10μA 5V 100mA 0.01μF 200K 47K V IN 2 CELLS SW LBO + 3.83M (1%metal film) LBI UC2306 100 μF FB ILIM SHDN 2N3906 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1.21M (1%metal film) GND + 220 μ F 22K 47K 5 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION(Cont.) 3.3V SEPIC Efficiency(Step-Up/Step-Down Converter) MBRS130L L1A V IN 2.5V to 8V + 2 C2 47 μ F 16V 1 V IN C1 1 μF L1B* 3 UC2306-3.3 SHUTDOWN 4 SW 3.3V 300mA SHDN SENSE GND I LIM + NC C3 100μF 10V 5V SEPIC (Step-Up/Step-Down Converter) MBRS130L L1A V IN 3V to 8V 2 + 47 μ F 16V V IN 1 SHDN SENSE GND I LIM NC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 L1B SW UC2306-5.0 SHUTDOWN C1 1 μF 3 5V 200mA + 100μF 10V 6 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION(Cont.) Single Li-lon Cell to 5V Converter with Load Disconnect at VIN＜2.7V 22μH 5V + 100μF 562k 1% 220k NC SINGLE LI-ION CELL 432k 1% MBRS130L V IN ILIM SW SENSE VOUT VIN1 VIN2 NC VINS VIN3 NC EN GND LBI UC2306-5.0 SHDN GND LBO UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw VOUT + 100μF 10V + 1μF 7 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION(Cont.) 2- TO 4- Cell to 5V Converter with Output Disconnect 2K ZTX788B L1 22μH VIN MBRS130L 5V 100mA 2V to 6V VIN + 47μF SW SENSE UC2306-5.0 SHUTDOWN SHDN ILIM GND + + 22μF 220μF NC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION(Cont.) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Super Burst Efficiency 90 VIN=3V 70 VIN=2V 60 50 40 0.01 0.1 1.0 10 100 Load Current (m) 5V to 12V Converter Efficiency 90 85 Efficiency (%) Efficiency (%) 80 80 75 70 65 1 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 100 Load Current(mA) 300 10 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(Cont.) Peak Switch Current Limit Switch Saturation Voltage 1.3 500 1.2 400 1.1 Peak Current (A) Saturation Voltage (mV) Ta =25℃ 300 200 100 1.0 0.9 0.8 0.7 0 0 0.2 0.4 0.6 0.8 Switch Current (A) 1.0 0.6 -50 1.2 -25 0 25 50 Temperature(℃) 75 100 1.250 1.245 Maximum OnTime 6 1.240 Feedback Voltage (V) 7 Time (μs) 100 Feedback Voltage On-and Off-times 8 5 4 3 Off-Time 2 1 1.235 1.230 1.225 1.220 1.215 1.210 1.205 0 -50 -25 0 25 50 Temperature(℃) 75 1.200 -50 100 -25 0 25 50 Temperature(℃) Feedback Pin Bias Current 20 Supply Current 300 Ta =25℃ 18 250 Supply Current (us) 16 14 Bias Current (nA) 75 12 10 8 6 4 VSHDN=VN NOT SWITCHING 200 150 100 VSHDN= 0 V 50 2 0 -50 -25 0 25 50 75 100 Temperature(℃) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 0 0 1 2 3 4 5 6 7 8 Input Voltage (V) 11 of 12 QW-R103-029,B UC2306 LINEAR INTEGRATED CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 12 of 12 QW-R103-029,B