UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT MICROPOWER DC/DC CONVERTERS WITH LOW-BATTERY DETECTOR ACTIVE IN SHUTDOWN DESCRIPTION SOP-8 The UTC UT2306 is a micropower step-up DC/DC converter ideal for use in small, low voltage, battery-operated systems. The devices operate from a wide input supply range of 1.5V to 8V. The UTC UT2306-3.3 and UT2306-5.0 generate regulated outputs of 3.3V and 5V and the adjustable UT2306 can deliver output voltages up to 25V.Quiescent current,120 μ A in active mode, decreases to just 10 μ A in shutdown with the low-battery detector still active. Peak switch current, internally set at 1A,can be reduced by adding a single resistor from the ILIM pin to ground. The high speed operation of the UTC UT2306 allows the use of small, surface-mountable inductors and capacitors. DIP-8 *Pb-free plating product number: UT2306L/UT2306L-3.3V/UT2306L-5.0V FEATURES *5V at 200mA from two cells. *10μA quiescent current in shutdown. *Operates with VIN as low as1.5V *Low battery detector active in shutdown *Low switch VCESAT:370mV at 1A typical. *120μA quiescent current in active mode. *Switching frequency up to 300kHz *Programmable peak current with one resistor. . APPLICATIONS *2-,3-,or 4-cell to 5V or 3.3V step-up *Portable instruments *Bar code scanners *Palmtop computers *Diagnostic medical instrumentation. *Personal data communicators/computers. PIN CONFIGURATION UTC LBI 1 8 FB(SENSE)* LBO 2 7 SHDN V IN 3 6 IL I M SW 4 5 GND UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER Input Voltage SW Voltage FB Voltage(UT2306) ILIM Voltage(UT2306-3.3/UT2306-5.0) SHDN Voltage LBI Voltage LBO Voltage Maximum Power Dissipation Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (soldering,10sec) SYMBOL RATING UNIT VIN 8 -0.4 ~ +25 VIN+0.3 5 6 VIN 8 500 125 0 ~ 70 -65 ~ +150 300 V V V V V V V mW PD Tj Topr Tstg °C °C °C °C ELECTRICAL CHARACTERISTICS (VIN=2V,VSHDN=2V Unless otherwise noted.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 1.5 1.65 V Minimum Operating Voltage * Operating Voltage Range * Quiescent Current * VSHDN=2V,Not switching * VSHDN=0V,VIN=2V 7 15 µA * VSHDN=0V,VIN=5V 27 50 µA 1.24 1.26 V 10 25 nA Quiescent Current In Shutdown Comparator Trip Point FB Pin Bias Current * * 120 1.22 8 V 200 µA Sense Pin Leakage in Shutdown * VSHDN=0V,Fixed Output Versions 0.002 1 µA Line Regulation * 1.8V≤VIN≤8V 0.04 0.15 %/V LBI Input Threshold * Falling Edge 1.17 1.25 V LBI Bias Current * 6 20 nA mV 1.10 LBI Input Hysteresis * 35 65 LBO Output Voltage Low * ISINK=500µA 0.2 0.4 V LBO Output Leakage Current SHDN Input Voltage High * LBI=1.5V,LBO=5V 0.01 0.1 µA SHDN Input Voltage Low * 0.4 V SHDN Pin Bias Current * V SHDN=5V 8 µA * V SHDN=0V * V 1.4 5 µA -5 -2 1 1.5 2 µs Switching Off Time * Switch On Time * Current Limit Not Asserted 4 6 8 µs Maximum Duty Cycle * Current Limit Not Asserted 76 80 88 % ILIM Pin Open,VIN=5V 0.8 1 1.2 Peak Switch Current 20K from ILIM to GND Switch Saturation Voltage Switch Leakage UTC * A mA 500 V Isw=1A 0.37 Isw=700mA 0.26 0.35 V Switch off, Vsw=5V 0.01 7 µA UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT The * denotes specifications which apply over the 0°C to 70°C operating temperature range. PIN FUNCTIONS PIN No. SYMBOL 1 LBI 2 LBO 3 VIN 4 SW 5 GND 6 ILIM 7 SHDN 8 DESCRIPTION Low Battery Detector Input. When voltage on this pin is less than 1.17V,detector output is low Low Battery Detector Output. Open collector can sink up to 500µA.Low battery detector remains active when device is shut down. Input Supply. Must be bypassed close (<0.2”) to the pin. See required layout in the Typical Applications Collector of Power NPN. Keep copper traces on this pin short and direct to minimize RFI Device Ground. Must be low impedance; solder directly to ground plane Current Limit Set Pin. Float for 1A peak switch current; a resistor to ground will lower peak current Shutdown Input. When low, switching regulator is turned off. The low-battery detector remains active. The SHDN input should not be left floating. If SHDN is not used, tie the pin to VIN On the UT2306 (adjustable) this pin goes to the comparator input. On the fixed-output versions, the pin connects to the resistor divider which sets output voltage. The divider is disconnected from the pin during shutdown. FB/SENSE TYPICAL APPLICATION 2-Cell to 5V Step-Up Converter with Low-Battery Detect D1 1N5817 3 1 + 2 CELLS 100μF VIN LBI 4 SW 8 SENSE 604K UT2306-5.0 6 NC I LIM IBO 2 SHDN 7 GND 5 100K Efficiency 80 + 5V 200mA 100μF LBO LOW WHEN VBAT＜2.2V EFFICIENCY (%) 22μH 499K 90 70 60 V IN =3.3V 50 V IN =2.5V SHUTDOWN V IN =1.8V 40 0.01 UTC 1 10 100 500 LOAD CURRENT(mA) UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS Peak Switch Current Limit Switch Saturation Voltage 1.3 500 Ta =25 ℃ Saturation Voltage (mV) 1.2 400 Peak Current (A) 1.1 300 200 100 1.0 0.9 0.8 0.7 0 0 0.2 0.4 0.6 0.8 1.0 0.6 -50 1.2 -25 0 25 50 75 100 75 100 Temperature( ℃) Switch Current (A) O n-and O ff-times Feedback Voltage 8 1.250 1.245 7 Maximum O n-Time 1.240 6 Feedback Voltage (V) 1.235 T ime ( μs) 5 4 3 O ff-T ime 2 1 0 -50 1.230 1.225 1.220 1.215 1.210 1.205 -25 0 25 50 75 1.200 -50 100 -25 0 Temperature( ℃) Feedback Pin Bias Current 300 Ta =25 ℃ 18 250 16 VSHDN=VN NOT SW ITCHING 200 12 Supply Current µ s) Bias Current (nA) 14 10 8 6 4 2 -25 0 25 50 Temperature( ℃) UTC 50 Supply Current 20 0 -50 25 Temperature( ℃) 75 100 150 100 VSHDN= 0 V 50 0 0 1 2 3 4 5 6 7 8 Input Voltage (V) UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT Load Transient Response Burst Mode Operation O V UT 100mV/DIV AC COUPLED OUT V 100mV / DIV AC COUPLED 0 Vs w 5V/DIV I L 500mA/DIV ILOAD 200mA 0 20μ s/DIV VIN=2.5V VOUT=5V ILOAD=185mA L=22 μ H 100 μ s / DIV BLOCK DIAGRAMS VIN + L1 C1 + VOUT C2 D1 2 LBO 3 VIN 4 SW 1.5V UNDERVOLTA GELOCKOUT 1 LBI 36mV + + A2 - A3 R2 1K 1.17V OFF R3 8 FB BIAS -1V Q3 1K A1 R4 R1 7.2Ω + ENABLE TIMERS 6μs ON 1.5μs OFF DRIVER 1.24V VREF Q1 ×200 Q2 ×1 SHUTDOWN 7 SHDN 6 ILIM 5 GND Figure 1. UT2306 Block Diagram. Independent Low-Battery Detector A3 Remains Alive When Device Is in Shutdown UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT 1 2 LBO 3 VIN 4 SW 1.5V UNDERVOLTA GELOCKOUT LBI 8 36mV + + A2 - A3 - 1K 1.17V OFF R3 BIAS -1V Q3 590K 1K R4 R1 7.2Ω R2 ENABLE A1 + TIMERS 6μs ON 1.5μs OFF 1.24V VREF Q1 ×200 Q2 ×1 DRIVER SHUTDOWN 7 SHDN 6 ILIM 5 GND R4=355K (UT2306-3.3V) R4=195K (UT2306-5.0V) Figure 2. UT2306-3.3/UT2306-5.0 Block Diagram OPERATION The UT2306 operation can best be understood by examining the block diagram in Figure 1.Comparator A1monitors the output voltage via resistor divider string R3/R4 at the FB pin. When VFB is higher than the 1.24V reference,A2 and the timers are turned off. Only the reference, A1 and A3 consume current, typically 120µA.As VFB drops below 1.24V plus A1’s hysteresis (about 6mV),A1 enables the rest of the circuit. Power switch Q1 is then cycled on for 6µs, or until current comparator A2 turns off the ON timer, Whichever comes first. Off-time is fixed at approximately 1.5µs. Q1’s switching cause current to alternately build up in inductor L1 and discharge into output capacitor C2 via D1, increasing the output voltage .As VFB increases enough to overcome C1’s hysteresis, switching action ceases. C2 is left to supply current to the load until VOUT decreases enough to force A1’s output high, and the entire cycle repeats. If switch current reaches 1A,causing A2 to trip, switch ON time is reduced. This allows continuous mode operation during bursts.A2 monitors the voltage across 7.2Ωresistor R1,which is directly related to the switch current.Q2’s collector current is set by the emitter-area ratio to 0.5% of Q1’s collector current. R1’s voltage drop exceeds 36mV,corresponding to 1A switch current,A2’s output goes high ,truncating the ON time part of the switch cycle. The 1A peak current can be reduced by tying a resistor between the ILIM pin and ground, causing a voltage drop to appear across R2.The drop offsets some of the 36mV reference voltage, lowering peak current. A 22K resistor limits current to approximately 550mA.A capacitor connected between ILIM and ground provides soft start. Shutdown is accomplished by grounding the SHDN pin. The low-battery detector A3 has its own 1.17V reference and is always on. The open collector output device can sink up to 500µA.Approximately 35mV of hysteresis is built into A3 to reduce ”buzzing” as the battery voltage reaches the trip level. INDUCTOR SELECTION Inductors used with the UT2306 must be capable of handling the worst-case peak switch current of 1.2A without saturating. Open flux rod or drum core units may be biased into saturation by 20% with only a small reduction in efficiency. For the majority of 2-cell or 3-cell input UT2306 applications, a 22µH or 20µH inductor such as the Sumida CD54-220 (drum) or Coiltronics CTX20-1 (toroid) will suffice. If switch current is reduced using the ILIM pin, smaller inductors such as the Sumida CD43 series or Coilcraft DO1608 series can be used. Minimizing UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT DCR is important for best efficiency. Ideally, the inductor DCR should be less than 0.05W, although the physical size of such an inductor makes its use prohibitive in many space conscious applications. If EMI is a concern, such as when sensitive analog circuitry is present, a toroidal inductor such as the Coiltronics CTX20-1 is suggested. A special case exists where the VOUT/VIN differential is high, such as a 2V to 12V boost converter. If the required duty cycle for continuous mode operation is higher than the UT2306 can provide, the converter must be designed for discontinuous operation. This means that the inductor current decreases to zero during the switch OFF time. For a simple step-up (boost) converter, duty cycle can be calculated by the following formula: DC = 1 – [(VIN – VSAT)/(VOUT + VD)] where, VIN = Minimum input voltage VSAT = Switch saturation voltage (0.3V) VOUT = Output voltage VD = Diode forward voltage (0.4V) If the calculated duty cycle exceeds the minimum UT2306 duty cycle of 76%, the converter should be designed for discontinuous mode operation. The inductance must be low enough so that current in the inductor reaches the peak current in a single cycle. Inductor value can be calculated by: L = (VIN – VSAT)(tON/1A) where, tON = Minimum on-time of UT2306 (4µs) One advantage of discontinuous mode operation is that inductor values are usually quite low so very small units can be used. Ripple current is higher than with continuous mode designs and efficiency will be somewhat less. Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used at the output of the UT2306 to minimize output ripple voltage. High quality input bypassing is also required. For surface mount applications AVX TPS series tantalum capacitors are recommended. These have been specifically designed for switch mode power supplies and have low ESR along with high surge current ratings. A 100µF, 10V AVX TPS surface mount capacitor typically limits output ripple voltage to 70mV when stepping up from 2V to 5V at a 200mA load. For through hole applications Sanyo OS-CON capacitors offer extremely low ESR in a small package size. Again, if peak switch current is reduced using the ILIM pin, capacitor requirements can be eased and smaller, higher ESR units can be used. Diode Selection Best performance is obtained with a Schottky rectifier such as the 1N5818. Motorola makes the MBRS130L Schottky which is slightly better than the 1N5818 and comes in a surface mount package. For lower switch currents, the MBR0530 is recommended. It comes in a very small SOD-123 package. Multiple 1N4148s in parallel can be used in a pinch, although efficiency will suffer. ILIM Function The UT2306’s current limit (ILIM) pin can be used for soft start. Upon start-up, the UT2306 will draw maximum current (about 1A) from the supply to charge the output capacitor. Figure 3 shows VOUT and VIN waveforms as the device is turned on. The high current flow can create IR drops along supply and ground lines or cause the input supply to drop out momentarily. By adding R1 and C1 as shown in Figure 4, the switch current is initially limited to well under 1A as detailed in Figure 5. Current flowing into C1 from R1 and the ILIM pin will eventually charge C1 and R1 effectively takes C1 out of the circuit. R1 also provides a discharge path for C1 when SHUTDOWN is brought low for turn-off. UTC UNISONIC TECHNOLOGIES CO., LTD. 7 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT V OUT 2V/DIV I IN 500mA/DIV V SHDN 10V/DIV 1ms/DIV Figure 3. Start-Up Response.Input Current Rises Quickly to 1A. VOUT Reaches 5V in Approximately 1ms.Output Drives 20mA Load MBRS130L 22μH * + 100μF 2 CELLS V IN LBI SW 5V SENSE 200mA UT2306-5.0 IBO GND SHDN I LIM R1 1M + + 100 μF C1 1μF SHUTDOWN *SUMIDA CD54-220 Figure4.2-Cell to 5V/200mA Boost Converter Takes Four External Parts.Components with Dashed Lines Are for Soft Start(Optional) If the full power capability of the UT2306 is not required,peak switch current can be limited by connecting a resistor RLIM from the ILIM pin to ground. With RLIM = 22k, peak switch current is reduced to approximately 500mA. Smaller power components can then be used. The graph in Figure 6 shows switch current vs RLIM resistor value. UTC UNISONIC TECHNOLOGIES CO., LTD. 8 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT VOUT 2V/DIV IIN 500mA/DIV VSHDN 10V/DIV 1ms/DIV 1304 F05 Figure 5. Start-Up Response with 1μF/1MΩComponents in Figure 2 Added. Input Current Is More Controlled. VOUT Reaches 5V in6ms.Output Drives 20mA Load. PEAK CURRENT(mA)(%) 1000 900 800 700 600 500 400 10 100 RLIM(kΩ 1000 Figure 6.Peak Switch Current vs RLIM Value LAYOUT/INPUT BYPASSING The UT2306 high speed switching mandates careful attention to PC board layout. Suggested component place-ment is shown in Figure 7.The input supply must have low impedance at AC and the input capacitor should be placed as indicated in the figure. The value of this capacitor depends on how close the input supply is to the IC. In situations where the input supply is more than a few inches away from the IC, a 47µF to 100µF solid tantalum bypass capacitor is required. If the input supply is close to the IC, a 1µF ceramic capacitor can be used instead. The UT2306 switches current in 1A pulses, so a low impedance supply must be available. If the power source (for example, a 2AA cell battery) is within 1 or 2 inches of the IC, the battery itself provides bulk capacitance and the 1µF ceramic capacitor acts to smooth voltage spikes at switch turn-on and turn –off. If the power source is far away from the IC, inductance in the power source leads results in high impedance at high frequency. A local high capacitance bypass is then required to restore low impedance at the IC. UTC UNISONIC TECHNOLOGIES CO., LTD. 9 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT SHUTDOWN 1 8 2 VIN 3 7 UT2306 6 4 5 + VOUT + CIN COUT GND (BATTERY AND LOAD RETURN) Figure 7. Suggested Layout for Best Performance.Input Capacitor Placement as Shown Is Highly Recommended.Switch Trace (pin 4) Copper Area Is Minimized Low-Battery Detector The UT2306 contains an independent low-battery detector that remains active when the device is shut down. This detector, actually a hysteretic comparator, has an open collector output that can sink up to 500µA.The comparator also operates below the switcher’s undervoltage lockout threshold, operating until VIN reaches approximately 1.4V.Figure 8 illustrates the input /output characteristic of the detector. Hysteresis is clearly evident in the figure. VLBO 2V/DIV VLBI 200mV/DIV Figure 8. Low-Battery Detector Transfer Function. Pull-Up R=22K,VIN=2V,Sweep Frequency=10Hz Battery Life How may hours does it work? This is the bottom line question that must be asked of any efficiency study. AA alkaline cells are not perfect power sources. For efficient power transfer, energy must be taken from AA cells at a rate that does not induce excessive loss. AA cells internal impedance, about 0.2Ω fresh and 0.5Ω end-of-life, results in significant efficiency loss at high discharge rates. Figure 10 illustrates battery life vs load current of Figure 9’s UT2306, 2-cell to 5V DC/DC converter. Note the accelerated decrease in hours at higher power levels. Figure 11 plots total watt hours vs load current. Watt hours are determined by the following formula: WH = ILOAD(5V)(H) UTC UNISONIC TECHNOLOGIES CO., LTD. 10 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT L1 22μH VIN SHDN B1 2 CELLS D1 SW VOUT 5V 200mA SENSE UT2306-5.0 LBI + C1 100μF ILIM IBO GND + C2 100μF Figure9.2-cell to 5V Converter Used in Battery Life Study 1000 HOURS(H) 100 10 1 1 10 100 200 LOAD CURRENT(mA) Figure 10. Battery Life vs Current.Dots Specify Actual Measurements UTC UNISONIC TECHNOLOGIES CO., LTD. 11 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT 6 WATT HOURS(WH) 5 4 3 2 1 0 1 10 100 LOAD CURRENT(mA) 200 Figure 11. Output Wall Hours vs Load Current. Note Rapid Fall-Off at Higher Discharge Rates Figure 11’s graph varies significantly from electrical efficiency plot pictured on the first page of this data sheet. Why? As more current is drawn from the battery, voltage drop across the cells’ internal impedance increases. This causes internal power loss (heating), reducing cell terminal voltage. Since the regulator input acts as a negative resistance, more current is drawn from the battery as the terminal voltage decreases. This positive feedback action compounds the problem. Figure 12 shows overall energy conversion efficiency, assuming availability of 6.5WH of battery energy. This efficiency approximates the electrical efficiency at load current levels from 1mA to 10mA, but drops severely at load currents above 10mA (load power above 50mW). The moral of the story is this: if your system needs 5V at more than 40mA to 50mA, consider using a NiCd battery (1/10 the internal impedance) instead of a AA cell alkaline battery. UTC UNISONIC TECHNOLOGIES CO., LTD. 12 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT ELECTROCHEMICAL EFFICIENCY(%) 100 90 80 70 60 50 40 30 20 10 0 1 10 LOAD CURRENT(mA) 100 200 Figure 12. Overall System Efficiency Including Battery Efficiency vs Load Current.Internal lmpedance of Alkaline AA Cells Accounts for Rapid Drop in Efficiency at Higher Load Current TYPICAL CHARACTERISTICS Super Burst Efficiency Super Burst Low 100μF V IN LBO SW LBI 3.83M 1% UT2306 FB L I IM SHDN 47K 5V 100mA 1.21M GND 22K + 220μF Efficiency (%) + 0.0 μF 1 200K VIN=3V 80 33 μH 47K 2 CELLS 90 DC/DC Converter MBR0530 IQ～10 ～～ μA 2N3906 IQ 70 VIN=2V 60 50 40 0.01 0.1 1.0 10 100 Load Current (m) UTC UNISONIC TECHNOLOGIES CO., LTD. 13 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT 2-Cell to 3.3V Boost Converter L1 22μH 90 2-Cell to 3.3V ConverterEfficiency MBRS130L 80 2 CELLS V IN SW SENSE UT2306-3.3 3.3V 300mA SHDN + GND ILIM 70 Efficiency (%) + C1 100μF C2 μF 100 10V 60 50 40 SHUTDOWN NC 30 0.1 C2 47μF 16V 1 4 VIN SW 3 UT2306-3.3 L1B * MBRS130L 3.3V 300mA SHDN SENSE SHUTDOWN GND I LIM + N C Efficiency (%) + C3 100μF 10V 70 65 60 55 50 1 5V SPEC (Step-Up/Step-Down Converter) C1 L1A VIN 3V TO 8V 2 1000 75 VIN 2 10 100 Load Current (mA) 80 C1 1μ F L1A 1 3.3V SEPIC Efficiency 3.3V SEPIC Efficiency(Step-Up/Step-Down Converter) 2.5V TO 8V VIN=3.3V VIN=2.5V VIN=1.8V 80 1μF 1 VIN=4.5V VIN=3.5V VIN=2.5V 10 100 Load Current (mA) 500 5V SEPIC Efficiency 75 + 47μF 16V V IN UT2306-5.0 SHUTDOWN SHDN SENSE I LIM GND NC MBRS130L L1B SW 3 5V 200mA + 100 μF 10V Efficiency (%) 4 70 65 VIN=6V 60 55 50 1 UTC VIN=5V VIN=4V VIN=3V 10 100 Load Current (mA) UNISONIC TECHNOLOGIES CO., LTD. 500 14 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT 5V to 12V DC/DC Converter L1 22μH 5V to 12V Converter Efficiency 90 D1 MBRS130L 5V 85 VIN 47μF SW UT2306 FB GND SHDN SHUTDONW 1.07M 1% 124K 1% 12V 200mA + 47μF 16V Efficiency (%) + 80 75 70 65 1 10 100 Load Current(mA) 300 Single Li-lon Cell to 5V Converter with Load Disconnect at Vin ＜2.7V 22μH MBRS130L 5V + 100μF 562k 1% VIN ILIM SW SENSE LBI UT2306-5.0 LI-ION 432k 1% UTC 220k NC SINGLE CELL + SHDN GND IBO Vout Vout VIN1 VIN2 NC VINS VIN3 NC EN GND UNISONIC TECHNOLOGIES CO., LTD. 1 μF 15 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT Negative LCD Bias Generator L1* 10μH MBR0530 VIN 1.69M 1% SW FB + UT2306 ILIM 1M 1% 90.9K 1% 47μF 2 CELLS 1μF CERAMIC + 22K MBR0530 110K 1% GND -VOUT -14V TO -22V 1mA TO 10mA 1000 pF + MBR0530 10μF 35V EFFICIENCY =70% TO 75% AT ILOAD≧2mA 3.3μF VOLTAGE ADJUST 1kHz PWM INPUT 0V TO 5V Electroluminescent Panel Driver with 200Hz Oscillator 47μF VIN 2V TO 7V + VIN 5V=OPERATE 0V=SHUTDOWN 22K 22K 2N3906 + 75K SHDN 1:12 3 4 1 6 MBR0530 1nF LBI ILIM 3.3K 0.01μF NC GH I HI GER GE N A D TA VOL SW FB LBO UT2306 GND 1μF 200V MUR160 600V EL PANEL CPANEL≦ 20nF 10M (3.3M*3) FMMT458 51K 22K 50K INTENSITY ADJUST 22K 1/2 BAW56 22K 1/2 BAW56 200Hz UTC UNISONIC TECHNOLOGIES CO., LTD. 16 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT 2-to 4-Cell to 1kV Step-Up Converter 0.01μF 0.01μF 0.01μF 0.01μF 0.01μF T1 VIN 2V TO 6V + 47μF 3 4 1 6 VIN 0.1μF 0.01μF 0.01μF R1 500M R2 620K SHDN ILIM GND 0.01μF GE VOLTA I HIGH R E G DAN MBR0530 SW FB UT2306 SHUTDOWN 0.01μF VOUT 1kV 250μA VOUT =1.24V(1+ R1 ) R2 NC 2- TO 4- Cell to 5V Converter with Output Disconnect 2K L1 22μH VIN MBRS130L 2V TO 6V ZTX788B VIN + 47μF SW SENSE 5V 100mA UT2306-5.0 SHDN ILIM SHUTDOWN UTC GND + + 22μF 220μF NC UNISONIC TECHNOLOGIES CO., LTD. 17 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT 2- Cell to 5V Converter with Auxiliary 10V Output MBR0530 10V + 1μF CERAMIC L1 20mA 10μF MBR0530 22μH MBRS130L 2CELLS + V IN 100μ F SW SENSE 5V 150mA UT2306-5.0 SHDN + ILIM SHUTDOWN GND 10 μF NC 2- Cell to 5V Converter with Auxiliary -5V Output L1 MBRS130L 22μ H 2 CELLS + VIN 100μF SW SENSE UC2603-5.0 UTC NC -5V 20mA GND + SHUTDOWN 150mA MBR0530 SHDN ILIM 5V 1μ F CERAMIC 10μ F MBR0530 UNISONIC TECHNOLOGIES CO., LTD. 18 QW-R103-029,A UTC UT2306/UT2306-3.3V/UT2306-5.0V 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. UTC UNISONIC TECHNOLOGIES CO., LTD. 19 QW-R103-029,A