ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ■General description ELM91xx1xA is CMOS PFM control step-up DC-DC converter; ELM91xx3xA is CMOS PFM control stepup DC-DC controller, which has large output current capacity by using an external FET switch. ELM91 series consists of reference voltage source, error amplifier, oscillation circuit, start-up circuit, PFM-control circuit, switching current limit circuit (ELM91xx1xA only), switching transistor (ELM91xx1xA only) and output voltage setting resistor. For external parts, coil, diode, MOSFET and capacitor are possible choices. The standard output voltages are 1.8V,3.0V,3.3V,5.0V; ELM91 series can also be designed as semi-custom IC within the range of 1.8V to 5.5V by 0.1V step. ■Features • • • • • • • ■Application Output voltage range Low voltage operation Oscillating frequency Low power operation High efficiency Output current(e.g.) Package : 1.8V to 5.5V (by 0.1V) • Constant voltage source for battery: 0.9V(ELM91xx1xA: Iout=1mA) operated devices : Typ.100kHz • Portable communication equipments : Typ.40µW(ELM91301xA: Typ.100kHz) and video recorders : 85%(ELM9130xxA: Vin=1.5V, Iout=10mA) : 100mA(Vin=1.5V, Vout=3.0V) : SOT-89, SOT-23, SC-70(SOT-323) ■Maximum absolute ratings Parameter Apply voltage to LX pin Apply voltage to VOUT pin Output current of LX pin Output current of EXT pin Power dissipation Operationg temperature Storage temperature Symbol Vlx Vout Ilx Iext Limit Vss-0.3 to 7.0 Vss-0.3 to 7.0 500 20 500 (SOT-89) 250 (SOT-23) 150 (SC-70) -40 to +85 -55 to +125 Pd Top Tstg Unit V V mA mA mW °C °C ■Selection guide ELM91xxxxA-x Symbol a, b c d e f e.g. : Output voltage 18: Vout=1.8V 30: Vout=3.0V 33: Vout=3.3V 50: Vout=5.0V 1: Internal switch Switching transistor 3: External switch A: SOT-89 Package B: SOT-23 C: SC-70(SOT-323) Product version A Taping direction S , N: Refer to PKG file 22 - 1 ELM91 x x x x A - x ↑ ↑ ↑ ↑ ↑ ↑ a b c d e f ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ■Pin configuration SOT-89(TOP VIEW) 1 2 3 SC-70(TOP VIEW) 3 3 1 3 ELM91xx1AA, ELM91xx3AA Pin No. 1 2 SOT-23(TOP VIEW) Pin name VSS VOUT ELM91xx1AA: LX ELM91xx3AA: EXT 1 2 ELM91xx1BA, ELM91xx3BA Pin No. 1 2 3 2 ELM91xx1CA, ELM91xx3CA Pin No. 1 Pin name VSS ELM91xx1BA: LX ELM91xx3BA: EXT VOUT 2 3 Pin name VSS ELM91xx1CA: LX ELM91xx3CA: EXT VOUT ■Standard circuit MA2Z748 100�H LX Vin Cin 47�F + ELM91xx1xA VSS Vin VOUT MA735 + Cin 100�F Vout + 33�H EXT ELM91xx3xA Cout 47�F VSS VOUT Vout + Cout 100�F ■Block diagram ELM91xx1xA LX Vlx Limiter ELM91xx3xA VOUT VOUT P.F.M. OSC EXT +- Start-up P.F.M. OSC Start-up Vref +Vref VSS VSS 22 - 2 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ■Electrical characteristics (ELM91xx1xA) ELM91181xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of LX switch Leakage current of LX pin Oscillating frequency Voltage limit of LX pin (LX switch ON) Duty ratio * Vout: Input voltage to out pin; ELM91301xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of LX switch Leakage current of LX pin Oscillating frequency Voltage limit of LX pin (LX switch ON) Duty ratio * Vout: Input voltage to out pin; ELM91331xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of LX switch Leakage current of LX pin Oscillating frequency Voltage limit of LX pin (LX switch ON) Duty ratio * Vout: Input voltage to out pin; Symbol Vout Vin Vst Vhold Iss1 Iss2 Ron Ilxl Fosc L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°C Condition Min. Typ. Max. Unit Iout=1mA, Vin=1.5V 1.755 1.800 1.845 V 0.9 6.0 V Iout=1mA 0.9 V Iout=1mA 0.7 V Vout=Vout(T)×0.95 10 25 μA Vout=Vout(T)+0.5V 2 5 μA Vout=Vout(T)×0.95 1.5 3.0 Ω Vout=Vlx=6V 1 μA Vout=Vout(T)×0.95 80 100 120 kHz Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V Duty Vout=Vout(T)×0.95 67 75 83 % Vout(T): Typ. value of Vout. L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°C Symbol Condition Min. Typ. Max. Unit Vout Iout=1mA, Vin=1.5V 2.925 3.000 3.075 V Vin 0.9 6.0 V Vst Iout=1mA 0.9 V Vhold Iout=1mA 0.7 V Iss1 Vout=Vout(T)×0.95 14 35 μA Iss2 Vout=Vout(T)+0.5V 2 5 μA Ron Vout=Vout(T)×0.95 0.9 1.9 Ω Ilxl Vout=Vlx=6V 1 μA Fosc Vout=Vout(T)×0.95 80 100 120 kHz Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V Duty Vout=Vout(T)×0.95 67 75 83 % Vout(T): Typ. value of Vout. Symbol Vout Vin Vst Vhold Iss1 Iss2 Ron Ilxl Fosc L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°C Condition Min. Typ. Max. Unit Iout=1mA, Vin=1.5V 3.218 3.300 3.382 V 0.9 6.0 V Iout=1mA 0.9 V Iout=1mA 0.7 V Vout=Vout(T)×0.95 15 35 μA Vout=Vout(T)+0.5V 2 5 μA Vout=Vout(T)×0.95 0.9 1.9 Ω Vout=Vlx=6V 1 μA Vout=Vout(T)×0.95 80 100 120 kHz Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V Duty Vout=Vout(T)×0.95 67 75 83 % Vout(T): Typ. value of Vout. 22 - 3 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ELM91501xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of LX switch Leakage current of LX pin Oscillating frequency Voltage limit of LX pin (LX switch ON) Duty ratio * Vout: Input voltage to out pin; Symbol Vout Vin Vst Vhold Iss1 Iss2 Ron Ilxl Fosc L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°C Condition Min. Typ. Max. Unit Iout=1mA, Vin=3V 4.875 5.000 5.125 V 0.9 6.0 V Iout=1mA 0.9 V Iout=1mA 0.7 V Vout=Vout(T)×0.95 20 45 μA Vout=Vout(T)+0.5V 2 5 μA Vout=Vout(T)×0.95 0.7 1.5 Ω Vout=Vlx=6V 1 μA Vout=Vout(T)×0.95 80 100 120 kHz Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V Duty Vout=Vout(T)×0.95 67 75 83 % Vout(T): Typ. value of Vout. ■Electrical characteristics (ELM91xx3xA) ELM91183xA FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=1mA, Vin=1.5V 1.755 1.800 1.845 V Input voltage Vin 0.9 6.0 V Starting voltage Vst Iout=1mA 1.1 V Holding voltage Vhold Iout=1mA 0.7 V Current consumption 1 Iss1 Vout=Vout(T)×0.95, EXT: No-Load 10 25 μA Current consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μA On-resistance of EXT “High” Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 90 170 Ω On-resistance of EXT “Low” Rextl Vout=Vout(T)×0.95, Vext=0.4V 70 120 Ω Oscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHz Duty ratio Duty Vout=Vout(T)×0.95 67 75 83 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. ELM91303xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of EXT “High” On-resistance of EXT “Low" Oscillating frequency Duty ratio FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C Symbol Condition Min. Typ. Max. Unit Vout Iout=1mA, Vin=1.5V 2.925 3.000 3.075 V Vin 0.9 6.0 V Vst Iout=1mA 1.1 V Vhold Iout=1mA 0.7 V Iss1 Vout=Vout(T)×0.95, EXT: No-Load 14 35 μA Iss2 Vout=Vout(T)+0.5V 2 5 μA Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 50 86 Ω Rextl Vout=Vout(T)×0.95, Vext=0.4V 36 60 Ω Fosc Vout=Vout(T)×0.95 80 100 120 kHz Duty Vout=Vout(T)×0.95 67 75 83 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. 22 - 4 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ELM91333xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of EXT “High” On-resistance of EXT “Low” Oscillating frequency Duty ratio * Vout: Input voltage to out pin; ELM91503xA Parameter Output voltage Input voltage Starting voltage Holding voltage Current consumption 1 Current consumption 2 On-resistance of EXT "High" On-resistance of EXT "Low" Oscillating frequency Duty ratio * Vout: Input voltage to out pin; FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C Symbol Condition Min. Typ. Max. Unit Vout Iout=1mA, Vin=1.5V 3.218 3.300 3.382 V Vin 0.9 6.0 V Vst Iout=1mA 1.1 V Vhold Iout=1mA 0.7 V Iss1 Vout=Vout(T)×0.95, EXT: No-Load 15 35 μA Iss2 Vout=Vout(T)+0.5V 2 5 μA Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 46 83 Ω Rextl Vout=Vout(T)×0.95, Vext=0.4V 33 55 Ω Fosc Vout=Vout(T)×0.95 80 100 120 kHz Duty Vout=Vout(T)×0.95 67 75 83 % Vout(T): Typ. value of Vout. FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C Symbol Condition Min. Typ. Max. Unit Vout Iout=1mA, Vin=3V 4.875 5.000 5.125 V Vin 0.9 6.0 V Vst Iout=1mA 1.1 V Vhold Iout=1mA 0.7 V ISS1 Vout=Vout(T)×0.95, EXT: No-Load 20 45 μA ISS2 Vout=Vout(T)+0.5V 2 5 μA Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 33 59 Ω Rextl Vout=Vout(T)×0.95, Vext=0.4V 24 45 Ω Fosc Vout=Vout(T)×0.95 80 100 120 kHz Duty Vout=Vout(T)×0.95 67 75 83 % Vout(T): Typ. value of Vout. ■Marking • SOT-89, SOT-23 package : ELM91xx1xA ELM91xx3xA SOT-89 a • SC-70 package : ELM91xx1CA ELM91xx3CA SOT-23 SC-70 b a a b c d c b c d a to d : Assembly lot No. A to Z (I, O, X excepted) and 0 to 9 a to c : Assembly lot No. A to Z (I, O, X excepted) and 0 to 9 22 - 5 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ■External parts To design DC/DC converters using ELM91xx1xA series, coil, diode, and capacitor are necessary. Except these external parts, switching transistor is also needed when using ELM91xx3xA. Please locate external parts to IC as close as possible, and lower the impedance of ground line. (Please refer to standard circuit) 1) Coil When choosing choke coil, please select that whose core is not magnetically saturated, DC resistance is low, and which has sufficient margin for rated current. The typical characteristics graphics of ELM91xx1xA series is done by following coil : SLF7045(TDK) The typical characteristics graphics of ELM91xx3xA series is done by following coil : SLF10145(TDK) 2) Diode When choosing diode, please select that whose forward voltage is small, switching speed is high and which has sufficient margin for rated current. For ELM91 series, ELM recommends schottoky diodes. 3) Capacitor When choosing capacitor, please select that which is generally used for smoothing power supply circuit, with comparatively large capacity and whose rated voltage is at least three times larger than rated output voltage of used ELM91 series. For ELM91 series, ELM recommends Aluminum electrolytic or Tantalum capacitor. Under different conditions, such as different input voltage, load current, etc. larger output voltage ripple may happen and thus result in intermittent switching. To prevent output voltage ripple from becoming larger, please use capacitor with comparatively larger capacity or small ESR. The output voltage of ELM91xx3xA may lower when the load current is large. To prevent this, please use output capacitor with comparatively large capacity or small ESR. Following characteristics graphics are made with ELM91303xA, when Vin=1.5V.{Cin=100μF(Ta), L=33μH} 100 330�F(Ta) 100�F(Ta) 2.5 1000�F(AL) 2 1.5 1 0 90 EFFICIENCY (%) Vout (V) 3 EFFICIENCY-Iout 1000�F(AL) 80 70 100�F(Ta) 60 330�F(Ta) 50 100 200 300 400 500 600 700 800 Iout (mA) 40 0 100 200 300 400 500 600 700 800 Iout (mA) 22 - 6 600 RIPPLE VOLTAGE (mV) Vout-Iout 3.5 RIPPLE VOLTAGE-Iout 500 100�F(Ta) 400 300 330�F(Ta) 200 100 0 1000�F(AL) 200 400 600 Iout (mA) 800 1000 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ■Typical characteristics (ELM91xx1xA) • ELM91181xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C) Vout-Iout Vout-Vin 2.5 2.5 2 Iout=1mA Vout (V) Vout (V) 2 1.5 Iout=10mA Iout=40mA 1 0.5 1.5 1 0 0.5 1 Vin (V) 1.5 0.5 2 0.1 1 10 Iout (mA) 100 1000 RIPPLE VOLTAGE-Iout 100 100 90 80 RIPPLE VOLTAGE(mV) EFFICIENCY(%) 1.1V 1.3V EFFICIENCY-Iout 1.5V 70 Vin=0.9V 60 1.3V 1.1V 50 40 1.5V Vin=0.9V 0.1 1 10 Iout (mA) 100 80 1.3V 60 1.1V 20 0 1000 1.5V 40 Vin=0.9V 0 20 40 60 80 100 120 140 160 180 200 Iout (mA) 22 - 7 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller Load Transient Response Load Transient Response 2 1.95 Output Voltage 1.9 Output Voltage(V) Output Voltage(V) 2 1.85 1.8 1.75 Output Current 1.95 Output Voltage 1.9 1.85 1.8 1.75 Output Current 50mA 50mA 1mA 1mA 0 100 200 300 400 500 600 700 800 900 0 100 200 300 400 500 600 700 800 900 Time(μS) Time(μS) Vhold-Iout Vst-Iout 900 1.1 800 1 700 Vhold (mV) Vst (V) 0.9 0.8 0.7 500 400 300 200 0.6 0.5 600 100 0 3 6 9 Iout (mA) 12 0 15 22 - 8 0 3 6 9 Iout (mA) 12 15 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller • ELM91301xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C) Vout-Iout Vout-Vin 3.5 3.5 1.5V 3 2.4V Vin=0.9V Iout=1mA Vout (V) Vout (V) 3 Iout=10mA 2.5 2 Iout=40mA 1.5 1.8V 2.5 1.1V 2 1 0.5 0 1 0.5 1.5 2 Vin (V) 2.5 1.5 3 10 Iout (mA) 1000 100 200 180 90 RIPPLE VOLTAGE(mV) EFFICIENCY(%) 1 RIPPLE VOLTAGE-Iout EFFICIENCY-Iout 100 2.4V 80 70 1.8V Vin=0.9V 60 1.5V 50 0.1 1 10 Iout (mA) 100 160 120 100 1.5V 1.8V 80 60 40 0 1000 2.4V 140 20 1.1V 40 0.1 1.1V Vin=0.9V 0 20 40 60 80 100 120 140 160 180 200 Iout(mA) 22 - 9 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller Load Transient Response Load Transient Response 3.2 3.15 Output Voltage 3.1 Output Voltage(V) Output Voltage(V) 3.2 3.05 3 2.95 Output Current 3.15 3.05 3 2.95 Output Current 50mA 50mA 1mA 1mA 0 100 200 300 400 500 600 700 800 900 0 100 200 300 400 500 600 700 800 900 Vst-Iout Vhold-Iout Time(μS) Time(μS) 1.1 900 800 1 700 Vhold (mV) Vst (V) 0.9 0.8 0.7 600 500 400 300 200 0.6 0.5 Output Voltage 3.1 100 0 3 6 9 Iout (mA) 12 0 15 22 - 10 0 3 6 9 Iout(mA) 12 15 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller • ELM91331xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C) Vout-Iout Vout-Vin 4 4 3.5 3.5 Iout=1mA Vout (V) Vout (V) 3 2.5 2 Iout=10mA 1.5 Iout=40mA 0.5 Vin=0.9V 2.5 1.8V 2 1 0 1 0.5 1.5 2 Vin (V) 2.5 1.5 3 0.1 10 1 Iout (mA) 100 1000 200 100 180 90 80 RIPPLE VOLTAGE(mV) EFFICIENCY(%) 1.5V RIPPLE VOLTAGE-Iout EFFICIENCY-Iout 2.4V 70 Vin=0.9V 1.8V 60 1.5V 50 0.1 1 10 Iout (mA) 100 160 100 80 1.5V 60 40 1.1V Vin=0.9V 0 20 40 60 80 100 120 140 160 180 200 Iout (mA) 22 - 11 2.4V 120 0 1000 1.8V 140 20 1.1V 40 2.4V 1.1V 3 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller Load Transient Response Load Transient Response 3.5 3.45 Output Voltage 3.4 Output Voltage(V) Output Voltage(V) 3.5 3.35 3.3 3.25 Output Current 3.45 3.35 3.3 3.25 Output Current 50mA 50mA 1mA 1mA 0 100 200 300 400 500 600 700 800 900 0 100 200 300 400 500 600 700 800 900 Vst-Iout Vhold-Iout Time(μS) Time(μS) 1.1 1000 900 1 800 Vhold (mV) Vst (V) 0.9 0.8 0.7 700 600 500 400 300 200 0.6 0.5 Output Voltage 3.4 100 0 3 6 9 Iout (mA) 12 0 15 22 - 12 0 3 6 9 Iout (mA) 12 15 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller • ELM91501xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C) Vout-Iout Vout-Vin 5.5 5.5 5 1.1V Iout=1mA Iout=10mA 4 Vout (V) 3.0V 5 3.5 Vout (V) 4.5 Iout=40mA 3 2.5 1.5V Vin=0.9V 4.5 1.8V 4 2 3.5 1.5 1 0.5 0 1 0.5 1.5 Vin (V) 2 2.5 3 3 10 Iout (mA) 100 1000 160 100 90 RIPPLE VOLTAGE(mV) EFFICIENCY(%) 1 RIPPLE VOLTAGE-Iout EFFICIENCY-Iout 3.0V 80 70 Vin=0.9V 1.8V 60 1.5V 1.1V 50 40 0.1 0.1 1 10 Iout (mA) 100 140 120 100 60 1.1V 20 Vin=0.9V 0 20 40 60 80 100 120 140 160 180 200 Iout (mA) 22 - 13 1.8V 3.0V 40 0 1000 1.5V 80 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller Load Transient Response Load Transient Response 5.2 5.15 Output Voltage 5.1 Output Voltage(V) Output Voltage(V) 5.2 5.05 5 4.95 5.15 Output Voltage 5.1 5.05 5 4.95 Output Current 50mA 1mA 0 100 200 300 400 500 600 700 800 900 0 100 200 300 400 500 600 700 800 900 Time(μS) Time(μS) Vhold-Iout Vst-Iout 2000 1.1 1800 1 1600 1400 Vhold (mV) Vst (V) 0.9 1200 0.8 1000 0.7 800 600 400 0.6 200 0.5 0 3 6 9 Iout (mA) 12 0 15 22 - 14 3 6 9 Iout (mA) 12 15 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ���������������������������������������������������������� ■Typical characteristics (ELM91xx3xA) •�ELM91183xA ������������� ������������������������������������������������������������������� (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C) � Vout-Vin Vout-Iout 2.5 2.5 Iout=10mA 1.5 Iout=300mA Vin=0.9V 1.5 Vin=1.1V Iout=100mA 1 0.5 0 Vin=1.5V 2 Vout (V) Vout (V) 2 Vin=1.3V 1 0.5 1 1.5 Vin (V) 2 0.5 0.1 EFFICIENCY-Iout 100 1000 RIPPLE VOLTAGE (mV) 800 90 EFFICIENCY (%) 10 RIPPLE VOLTAGE-Iout 100 Vin=1.5V 80 Vin=0.9V 70 Vin=1.1V 60 Vin=1.3V 50 40 0.1 1 1 10 Iout (mA) 100 700 600 500 22 - 15 �� Vin=1.3V Vin=0.9V Vin=1.5V 400 300 200 100 0 0 1000 Vin=1.1V 200 400 600 Iout (mA) 800 1000 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ���������������������������������������������������������� Load Transient Response Load Transient Response Vin=1.2V 1.95 1.9 1.9 Vout 1.85 1.8 Vout (V) Vout (V) 1.85 1.75 1.7 1.65 1.6 1.55 1.5 0 Vin=1.2V 1.95 100mA 1mA 200 1.75 1.7 1.65 Iout Vout 1.8 1.6 100mA Iout 1.55 400 600 Time (�s) 800 1.5 0 1000 200 800 1000 80 100 0.8 0.7 1.2 0.6 Vhold (V) Vst (V) 600 Time (�s) Vhold-Iout Vst-Iout 1.3 1.1 1 0.5 0.4 0.3 0.2 0.9 0.8 0 1mA 400 0.1 20 40 60 Iout (mA) 80 0 0 100 22 �� - 16 20 40 60 Iout (mA) ELM91xxxxA PFM Step-up DC/DC converter and controller ����������������������������������������������� �����������CMOS •�ELM91303xA ������������� ������������������������������������������������������������������� (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C) � Vout-Vin Vout-Iout 3.5 3.5 Vin=2.4V Vin=1.8V 3 2.5 2.5 2 Iout=300mA 1.5 1 0 100 0.5 1 1.5 Vin (V) 2 2.5 1 0.1 800 Vin=2.4V Vin=1.8V Vin=0.9V Vin=1.1V Vin=1.5V 60 50 1 10 Vin=1.5V 2 3 80 40 0.1 Vin=1.1V EFFICIENCY-Iout 70 Vin=0.9V 1.5 Iout=100mA 90 EFFICIENCY (%) Vout (V) 3 RIPPLE VOLTAGE (mV) Vout (V) Iout=10mA Iout (mA) 100 22 -�� 17 10 Vin=1.5V 500 300 1000 Vin=1.8V 600 400 100 RIPPLE VOLTAGE-Iout 700 Vin=0.9V Vin=1.1V Vin=2.4V 200 100 0 1000 1 200 400 600 Iout (mA) 800 1000 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ���������������������������������������������������������� Load Transient Response Load Transient Response Vin=1.5V 3.15 3.1 3.1 Vout 3.05 3 Vout (V) Vout (V) 3.05 2.95 2.9 2.85 2.8 2.75 2.7 0 Vin=1.5V 3.15 100mA 3 2.95 2.9 2.85 Iout 2.8 1mA 200 Vout 100mA Iout 2.75 400 600 Time (�s) 800 1000 2.7 0 200 Vst-Iout 1mA 400 600 800 1000 Vhold-Iout 1.3 1 0.9 1.2 0.8 Vhold (V) Vst (V) 0.7 1.1 1 0.6 0.5 0.4 0.3 0.9 0.2 0.1 0.8 0 20 40 60 Iout (mA) 80 0 0 100 22 �� - 18 20 40 60 Iout (mA) 80 100 ELM91xxxxA PFM Step-up DC/DC converter and controller ����������������������������������������������� �����������CMOS •�ELM91333xA ������������� ������������������������������������������������������������������� (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C) � Vout-Vin Vout-Iout 4 4 Vin=2.4V Iout=10mA 3.5 3.5 Vin=1.8V Vout (V) Vout (V) 3 2.5 Iout=300mA 2 3 2.5 Vin=1.1V Iout=100mA 1.5 1 0 Vin=0.9V Vin=1.5V 2 0.5 1 1.5 2 Vin (V) 2.5 3 3.5 1.5 0.1 EFFICIENCY-Iout 100 1000 800 RIPPLE VOLTAGE (mV) Vin=2.4V Vin=1.8V 90 EFFICIENCY (%) 10 RIPPLE VOLTAGE-Iout 100 80 Vin=0.9V 70 Vin=1.1V 60 Vin=1.5V 50 40 0.1 1 1 10 Iout (mA) 100 700 600 22 -�� 19 Vin=0.9V 400 300 Vin=1.8V Vin=1.1V Vin=2.4V 200 100 0 0 1000 Vin=1.5V 500 200 400 600 Iout (mA) 800 1000 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ���������������������������������������������������������� Load Transient Response Load Transient Response Vin=1.5V 3.45 3.4 3.4 Vout 3.3 3.25 3.2 3.1 3.05 3 0 100mA 3.3 3.25 3.2 3.15 Iout 3.1 1mA 200 400 600 Time (�s) 800 1000 3 0 Vst-Iout 200 1mA 400 600 800 1000 Vhold-Iout 1.2 1 Vhold (V) 1.2 Vst (V) 100mA Iout 3.05 1.3 1.1 1 0.9 0.8 0 Vout 3.35 Vout (V) Vout (V) 3.35 3.15 Vin=1.5V 3.45 0.8 0.6 0.4 0.2 20 40 60 Iout (mA) 80 0 0 100 22 �� - 20 20 40 60 Iout (mA) 80 100 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ���������������������������������������������������������� •� ������������� ELM91503xA ������������������������������������������������������������������� (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C) � Vout-Vin 5.5 Vout-Iout 5.5 Iout=10mA Vin=3.0V 5 4.5 Iout=300mA Vout (V) Vout (V) 5 Iout=100mA 4 3.5 3 2.5 0 Vin=0.9V 4.5 Vin=1.1V 3.5 1 2 3 4 5 3 0.1 EFFICIENCY-Iout 10 100 1000 600 80 Vin=0.9V RIPPLE VOLTAGE (mV) Vin=3.0V 90 EFFICIENCY (%) 1 RIPPLE VOLTAGE-Iout 100 Vin=1.5V Vin=1.8V Vin=1.1V 60 50 40 0.1 Vin=1.8V 4 Vin (V) 70 Vin=1.5V 1 10 Iout (mA) 100 500 300 22 �� - 21 Vin=1.8V Vin=1.5V 200 100 0 0 1000 Vin=3.0V 400 Vin=1.1V Vin=0.9V 200 400 600 Iout (mA) 800 1000 ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller ���������������������������������������������������������� Load Transient Response Load Transient Response Vin=2.4V 5.15 5.1 5.05 5 Vout (V) Vout (V) 5.1 Vout 5.05 4.95 4.9 4.85 4.8 4.75 4.7 0 100mA 4.95 4.9 4.85 Iout Vout 5 4.8 1mA 200 Vin=2.4V 5.15 100mA Iout 4.75 400 600 Time (�s) 800 1000 4.7 0 200 Vst-Iout 800 1000 1.6 1.4 1.2 1.2 Vhold (V) Vst (V) 600 Vhold-Iout 1.3 1.1 1 1 0.8 0.6 0.4 0.9 0.8 0 1mA 400 0.2 20 40 60 Iout (mA) 80 0 0 100 22�� - 22 20 40 60 Iout (mA) 80 100