ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller

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ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller General description ELM9xxxA is CMOS PFM control step-up DC-DC converter; ELM9xxxA is CMOS PFM control stepup DC-DC controller, which has large output current capacity by using an external FET switch. ELM9 series consists of reference voltage source, error amplifier, oscillation circuit, start-up circuit, PFM-control circuit, switching current limit circuit (ELM9xxxA only), switching transistor (ELM9xxxA only) and output voltage setting resistor. For external parts, coil, diode, MOSFET and capacitor are possible choices. The standard output voltages are.8v,.v,.v,5.v; ELM9 series can also be designed as semi-custom IC within the range of.8v to 5.5V by.v step. Features Output voltage range :.8V to 5.5V (by.v) Low voltage operation :.9V(ELM9xxxA: Iout=mA) Oscillating frequency : Typ.kHz Low power operation : Typ.4µW(ELM9xA: Typ.kHz) High efficiency : 85%(ELM9xxA: Vin=.5V, Iout=mA) Output current(e.g.) : ma(vin=.5v, Vout=.V) Package : SOT-89, SOT-, SC-7-5(SOT-5) Application Constant voltage source for batteryoperated devices Portable communication equipments and video recorders Maximum absolute ratings Parameter Symbol Limit Unit Apply voltage to LX pin Vlx Vss-. to 7. V Apply voltage to VOUT pin Vout Vss-. to 7. V Output current of LX pin Ilx 5 ma Output current of EXT pin Iext ma Power dissipation Pd 5 (SOT-89) 5 (SOT-) 5 (SC-7-5)(SOT-5) Operationg temperature Top -4 to +85 C Storage temperature Tstg -55 to +5 C mw Selection guide ELM9xxxxA-x Symbol a, b Output voltage e.g. : 8: Vout=.8V : Vout=.V : Vout=.V 5: Vout=5.V c Switching transistor : Internal switch : External switch d Package A: SOT-89 B: SOT- C: SC-7-5(SOT-5) e Product version A f Taping direction S, N: Refer to PKG file ELM9 x x x x A - x a b c d e f - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller Pin configuration SOT-89(TOP VIEW) SOT-(TOP VIEW) SC-7-5(TOP VIEW) ELM9xxxAA ELM9xxxBA ELM9xxxCA Pin No. Pin name Pin No. Pin name Pin No. Pin name VSS VSS NC VOUT ELM9xxBA: LX VOUT ELM9xxAA: LX ELM9xxBA: EXT NC ELM9xxAA: EXT VOUT 4 VSS 5 LX, EXT Standard circuit MAZ748 Vin H MA75 H LX VOUT ELM9xxxA Vin Vout + + Cin 47 F 47 F VSS Cout + Cin F EXT VOUT ELM9xxxA + VSS Cout F Vout Block diagram ELM9xxxA ELM9xxxA LX Vlx Limiter VOUT VOUT P.F.M. OSC EXT P.F.M. OSC Start-up Vref + - Start-up Vref + - VSS VSS - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller Electrical characteristics (ELM9xxxA) ELM98xA L=μH, Cin=Cout=47μF, D=MAZ748, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=.5V.755.8.845 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA.9 V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95 5 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of LX switch Ron Vout=Vout(T).95.5. Ω Leakage current of LX pin Ilxl Vout=Vlx=6V μa Oscillating frequency Fosc Vout=Vout(T).95 8 khz Voltage limit of LX pin (LX switch ON) Vlxlim Vout=Vout(T).95.5.7.9 V Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. ELM9xA L=μH, Cin=Cout=47μF, D=MAZ748, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=.5V.95..75 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA.9 V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95 4 5 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of LX switch Ron Vout=Vout(T).95.9.9 Ω Leakage current of LX pin Ilxl Vout=Vlx=6V μa Oscillating frequency Fosc Vout=Vout(T).95 8 khz Voltage limit of LX pin (LX switch ON) Vlxlim Vout=Vout(T).95.5.7.9 V Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. ELM9xA L=μH, Cin=Cout=47μF, D=MAZ748, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=.5V.8..8 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA.9 V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95 5 5 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of LX switch Ron Vout=Vout(T).95.9.9 Ω Leakage current of LX pin Ilxl Vout=Vlx=6V μa Oscillating frequency Fosc Vout=Vout(T).95 8 khz Voltage limit of LX pin (LX switch ON) Vlxlim Vout=Vout(T).95.5.7.9 V Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM95xA L=μH, Cin=Cout=47μF, D=MAZ748, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=V 4.875 5. 5.5 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA.9 V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95 45 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of LX switch Ron Vout=Vout(T).95.7.5 Ω Leakage current of LX pin Ilxl Vout=Vlx=6V μa Oscillating frequency Fosc Vout=Vout(T).95 8 khz Voltage limit of LX pin (LX switch ON) Vlxlim Vout=Vout(T).95.5.7.9 V Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. Electrical characteristics (ELM9xxxA) ELM98xA FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=.5V.755.8.845 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA. V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95, EXT: No-Load 5 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of EXT High Rexth Vout=Vout(T).95, Vext=Vout-.4V 9 7 Ω On-resistance of EXT Low Rextl Vout=Vout(T).95, Vext=.4V 7 Ω Oscillating frequency Fosc Vout=Vout(T).95 8 khz Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. ELM9xA FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=.5V.95..75 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA. V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95, EXT: No-Load 4 5 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of EXT High Rexth Vout=Vout(T).95, Vext=Vout-.4V 5 86 Ω On-resistance of EXT Low" Rextl Vout=Vout(T).95, Vext=.4V 6 6 Ω Oscillating frequency Fosc Vout=Vout(T).95 8 khz Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. - 4 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM9xA FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=.5V.8..8 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA. V Holding voltage Vhold Iout=mA.7 V Current consumption Iss Vout=Vout(T).95, EXT: No-Load 5 5 μa Current consumption Iss Vout=Vout(T)+.5V 5 μa On-resistance of EXT High Rexth Vout=Vout(T).95, Vext=Vout-.4V 46 8 Ω On-resistance of EXT Low Rextl Vout=Vout(T).95, Vext=.4V 55 Ω Oscillating frequency Fosc Vout=Vout(T).95 8 khz Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. ELM95xA FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C Parameter Symbol Condition Min. Typ. Max. Unit Output voltage Vout Iout=mA, Vin=V 4.875 5. 5.5 V Input voltage Vin.9 6. V Starting voltage Vst Iout=mA. V Holding voltage Vhold Iout=mA.7 V Current consumption ISS Vout=Vout(T).95, EXT: No-Load 45 μa Current consumption ISS Vout=Vout(T)+.5V 5 μa On-resistance of EXT "High" Rexth Vout=Vout(T).95, Vext=Vout-.4V 59 Ω On-resistance of EXT "Low" Rextl Vout=Vout(T).95, Vext=.4V 4 45 Ω Oscillating frequency Fosc Vout=Vout(T).95 8 khz Duty ratio Duty Vout=Vout(T).95 67 75 8 % * Vout: Input voltage to out pin; Vout(T): Typ. value of Vout. Marking SOT-89, SOT- package : ELM9xxxA ELM9xxxA SOT-89 SOT- SC-7-5 package : ELM9xxxCA SC-7-5 a to d : Assembly lot No. A to Z (I, O, X excepted) and to 9 a to c : Assembly lot No. A to Z (I, O, X excepted) and to 9-5 Rev..

External parts ) Coil ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller To design DC/DC converters using ELM9xxxA series, coil, diode, and capacitor are necessary. Except these external parts, switching transistor is also needed when using ELM9xxxA. Please locate external parts to IC as close as possible, and lower the impedance of ground line. (Please refer to standard circuit) 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 ELM9xxxA series is done by following coil : SLF745(TDK) The typical characteristics graphics of ELM9xxxA series is done by following coil : SLF45(TDK) ) 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 ELM9 series, ELM recommends schottoky diodes. ) 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 ELM9 series. For ELM9 series, ELM recommends Aluminum electrolytic or Tantalum capacitor. Under operating conditions using capacitor with low ESR such as ceramic capacitor, larger output voltage ripple may happen and thus result in intermittent switching. To prevent output voltage ripple from becoming larger, please connect resistor {. ohm ~ a few ohm } in series with output capacitor. The output voltage of ELM9xxxA may lower when the load current is large. To prevent this, please use output capacitor with comparatively large capacity. Following characteristics graphics are made with ELM9xA, when Vin=.5V.{Cin=μF(Ta), L=μH}.5 Vout-Iout EFFICIENCY-Iout 6 RIPPLE VOLTAGE-Iout.5.5 F(Ta) F(Ta) F(AL) EFFICIENCY (%) 9 8 7 6 5 F(Ta) F(AL) F(Ta) RIPPLE VOLTAGE (mv) 5 4 F(Ta) F(Ta) F(AL) 4 5 6 7 8 4 4 5 6 7 8 4 6 8 Rev.. - 6

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller Typical characteristics (ELM9xxxA) ELM98xA(L=μH, Cin=Cout=47μF, D=MAZ748, Top=5 C).5 Vout-Vin.5 Vout-Iout.5 Iout=mA Iout=mA Iout=4mA.5.V.V.5V.5.5.5 Vin (V).5. EFFICIENCY-Iout RIPPLE VOLTAGE-Iout EFFICIENCY(%) 9 8 7 6 5.5V.V.V RIPPLE VOLTAGE(mV) 8 6 4.V.V.5V 4. 4 6 8 4 6 8-7 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller Output Voltage(V).95.9.85.8.75 Output Voltage Output Current Output Voltage(V).95.9.85.8.75 Output Voltage Output Current 5mA 5mA ma ma 4 5 6 7 8 9 Time( S) 4 5 6 7 8 9 Time( S). Vst-Iout 9 Vhold-Iout 8 7 Vst (V).9.8.7 Vhold (mv) 6 5 4.6.5 6 9 5 6 9 5-8 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM9xA(L=μH, Cin=Cout=47μF, D=MAZ748, Top=5 C).5 Vout-Vin.5 Vout-Iout.5.5 Iout=mA Iout=mA Iout=4mA.5.5V.4V.8V.V.5.5.5.5 Vin (V).5. EFFICIENCY(%) 9 8 7 6 5 EFFICIENCY-Iout.V.4V.5V.8V 4. RIPPLE VOLTAGE(mV) 8 6 4 8 6 4 RIPPLE VOLTAGE-Iout.4V.5V.8V.V 4 6 8 4 6 8 Iout(mA) - 9 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller.. Output Voltage(V).5..5.95 Output Voltage Output Current Output Voltage(V).5..5.95 Output Voltage Output Current 5mA 5mA ma ma 4 5 6 7 8 9 Time( S) 4 5 6 7 8 9 Time( S). Vst-Iout 9 Vhold-Iout 8 Vst (V).9.8.7 Vhold (mv) 7 6 5 4.6.5 6 9 5 6 9 5 Iout(mA) - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM9xA(L=μH, Cin=Cout=47μF, D=MAZ748, Top=5 C) 4 Vout-Vin 4 Vout-Iout.5.5.5 Iout=mA Iout=mA Iout=4mA.5.5.V.5V.4V.8V.5.5.5.5 Vin (V).5. EFFICIENCY(%) EFFICIENCY-Iout 9 8.4V 7.8V 6.5V 5.V 4. RIPPLE VOLTAGE(mV) 8 6 4 8 6 4 RIPPLE VOLTAGE-Iout.8V.4V.5V.V 4 6 8 4 6 8 - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller.5.5 Output Voltage(V).45.4.5..5 Output Voltage Output Current Output Voltage(V).45.4.5..5 Output Voltage Output Current 5mA 5mA ma ma 4 5 6 7 8 9 Time( S) 4 5 6 7 8 9 Time( S). Vst-Iout Vhold-Iout 9 8 Vst (V).9.8.7 Vhold (mv) 7 6 5 4.6.5 6 9 5 6 9 5 - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM95xA(L=μH, Cin=Cout=47μF, D=MAZ748, Top=5 C) 5.5 Vout-Vin 5.5 Vout-Iout 5 4.5 4.5.5 Iout=mA Iout=mA Iout=4mA 5 4.5 4.V.5V.V.8V.5.5.5.5.5.5 Vin (V). EFFICIENCY-Iout 6 RIPPLE VOLTAGE-Iout EFFICIENCY(%) 9 8 7 6 5.8V.5V.V.V 4. RIPPLE VOLTAGE(mV) 4 8 6 4.8V.5V.V.V 4 6 8 4 6 8 - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller 5. 5. Output Voltage(V) 5.5 5. 5.5 5 4.95 Output Voltage Output Voltage(V) 5.5 5. 5.5 5 4.95 Output Voltage Output Current 5mA ma 4 5 6 7 8 9 Time( S) 4 5 6 7 8 9 Time( S). Vst-Iout Vhold-Iout 8 6 Vst (V).9.8.7 Vhold (mv) 4 8 6.6 4.5 6 9 5 6 9 5-4 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller Typical characteristics (ELM9xxxA) ELM98xA (FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C).5 Vout-Vin.5 Vout-Iout Iout=mA Vin=.5V.5 Iout=mA.5 Vin=.V Iout=mA Vin=.V.5.5.5 Vin (V).5. EFFICIENCY-Iout 8 RIPPLE VOLTAGE-Iout EFFICIENCY (%) 9 8 7 6 5 Vin=.5V Vin=.V Vin=.V RIPPLE VOLTAGE (mv) 7 6 5 4 Vin=.V Vin=.V Vin=.5V 4. 4 6 8-5 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller.95 Vin=.V.9.85 Vout.8.75.7.65.6 ma Iout.55 ma.5 4 6 8 Time ( s).95 Vin=.V.9.85 Vout.8.75.7.65.6 Iout ma.55 ma.5 4 6 8 Time ( s). Vst-Iout.8 Vhold-Iout..7.6 Vst (V). Vhold (V).5.4..9...8 4 6 8 4 6 8-6 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM9xA (FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C).5 Vout-Vin Iout=mA.5 Vout-Iout Vin=.4V Vin=.8V.5 Iout=mA.5 Vin=.V Vin=.5V.5 Iout=mA.5.5.5.5 Vin (V). EFFICIENCY (%) 9 8 7 6 5 EFFICIENCY-Iout Vin=.4V Vin=.8V Vin=.V Vin=.5V RIPPLE VOLTAGE (mv) 8 7 6 5 4 RIPPLE VOLTAGE-Iout Vin=.8V Vin=.5V Vin=.V Vin=.4V 4. 4 6 8-7 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller.5 Vin=.5V..5 Vout.95.9.85.8 ma Iout.75 ma.7 4 6 8 Time ( s).5 Vin=.5V..5 Vout.95.9.85.8 Iout ma.75 ma.7 4 6 8 Vst (V)....9 Vst-Iout.8 4 6 8 Vhold (V).9.8.7.6.5.4... Vhold-Iout 4 6 8-8 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM9xA (FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C) 4 Vout-Vin 4 Vout-Iout.5 Iout=mA.5 Vin=.4V Vin=.8V.5.5 Iout=mA Iout=mA.5 Vin=.V Vin=.5V.5.5.5.5 Vin (V).5. EFFICIENCY-Iout 8 RIPPLE VOLTAGE-Iout EFFICIENCY (%) 9 8 7 6 5 Vin=.4V Vin=.8V Vin=.V Vin=.5V RIPPLE VOLTAGE (mv) 7 6 5 4 Vin=.5V Vin=.8V Vin=.V Vin=.4V 4. 4 6 8-9 Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller.45 Vin=.5V.4.5 Vout..5..5. ma Iout.5 ma 4 6 8 Time ( s).45 Vin=.5V.4.5 Vout..5..5. Iout ma.5 ma 4 6 8. Vst-Iout. Vhold-Iout. Vst (V)..9 Vhold (V).8.6.4..8 4 6 8 4 6 8 - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller ELM95xA (FET=ELM74FA, L=μH, Cin=Cout=μF, D=MA75, Vss=V, Top=5 C) 5.5 5 Vout-Vin Iout=mA 5.5 5 Vout-Iout Vin=.V 4.5 4.5 Iout=mA Iout=mA 4.5 4 Vin=.V Vin=.5V Vin=.8V.5.5 4 5 Vin (V). EFFICIENCY (%) 9 8 7 6 5 EFFICIENCY-Iout Vin=.V Vin=.V Vin=.5V Vin=.8V 4. RIPPLE VOLTAGE (mv) 6 5 4 RIPPLE VOLTAGE-Iout Vin=.5V Vin=.8V Vin=.V Vin=.V 4 6 8 - Rev..

ELM9xxxxA CMOS PFM Step-up DC/DC converter and controller 5.5 Vin=.4V 5. 5.5 Vout 5 4.95 4.9 4.85 4.8 ma Iout 4.75 ma 4.7 4 6 8 Time ( s) 5.5 Vin=.4V 5. 5.5 Vout 5 4.95 4.9 4.85 4.8 Iout ma 4.75 ma 4.7 4 6 8. Vst-Iout.6 Vhold-Iout..4. Vst (V). Vhold (V).8.6.9.4..8 4 6 8 4 6 8 - Rev..