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http://www.elm-tech.com
Rev.1.31 /
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
■General description
Parameter Symbol Limit UnitApply voltage to LX pin Vlx Vss-0.3 to 7.0 VApply voltage to VOUT pin Vout Vss-0.3 to 7.0 VOutput current of LX pin Ilx 500 mAOutput current of EXT pin Iext 20 mA
Power dissipation Pd500 (SOT-89)
mW250 (SOT-23) 150 (SC-70-5)(SOT-353)
Operationg temperature Top -40 to +85 °CStorage temperature Tstg -55 to +125 °C
• Output voltage range : 1.8V to 5.5V (by 0.1V)• Low voltage operation : 0.9V(ELM91xx1xA: Iout=1mA)• Oscillating frequency : Typ.100kHz• Low power operation : Typ.40µW(ELM91301xA: Typ.100kHz)• High efficiency : 85%(ELM9130xxA: Vin=1.5V, Iout=10mA) • Output current(e.g.) : 100mA(Vin=1.5V, Vout=3.0V)• Package : SOT-89, SOT-23, SC-70-5(SOT-353)
• Constant voltage source for battery- operated devices• Portable communication equipments and video recorders
ELM91xxxxA-xSymbol
a, b Output voltagee.g. :18: Vout=1.8V 30: Vout=3.0V33: Vout=3.3V 50: Vout=5.0V
c Switching transistor 1: Internal switch3: External switch
d PackageA: SOT-89B: SOT-23C: SC-70-5(SOT-353)
e Product version Af Taping direction S , N: Refer to PKG file
ELM91 x x x x A - x ↑ ↑ ↑ ↑ ↑ ↑ a b c d e f
■Features
■Maximum absolute ratings
■Selection guide
■Application
ELM91xx1xA is CMOS PFM control step-up DC-DC converter; ELM91xx3xA is CMOS PFM control step-up 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.
22
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Rev.1.32 /
SOT-89(TOP VIEW) SOT-23(TOP VIEW) SC-70-5(TOP VIEW)
ELM91xxxAA ELM91xxxBA ELM91xxxCAPin No. Pin name
1 VSS2 VOUT
3 ELM91xx1AA: LXELM91xx3AA: EXT
Pin No. Pin name1 VSS
2 ELM91xx1BA: LXELM91xx3BA: EXT
3 VOUT
Pin No. Pin name1 NC2 VOUT3 NC4 VSS5 LX, EXT
■Pin configuration
■Standard circuit
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
+Cout
MA2Z748
Vin VoutLX VOUT
VSS
+Cin
ELM91xx1xA100 H�
47 F� 47 F�
+ELM91xx3xA
MA735Vin
VoutEXT VOUT+
VSS
Cin
Cout100 F�
100 F�
33 H�
ELM91xx1xA ELM91xx3xA
■Block diagram
22
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Rev.1.33 /
L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°CParameter Symbol Condition Min. Typ. Max. Unit
Output voltage Vout Iout=1mA, Vin=1.5V 1.755 1.800 1.845 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 0.9 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95 10 25 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of LX switch Ron Vout=Vout(T)×0.95 1.5 3.0 ΩLeakage current of LX pin Ilxl Vout=Vlx=6V 1 μAOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzVoltage limit of LX pin(LX switch ON) Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V
Duty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
■Electrical characteristics (ELM91xx1xA)
ELM91181xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=1.5V 3.218 3.300 3.382 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 0.9 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95 15 35 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of LX switch Ron Vout=Vout(T)×0.95 0.9 1.9 ΩLeakage current of LX pin Ilxl Vout=Vlx=6V 1 μAOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzVoltage limit of LX pin(LX switch ON) Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V
Duty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°CELM91331xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=1.5V 2.925 3.000 3.075 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 0.9 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95 14 35 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of LX switch Ron Vout=Vout(T)×0.95 0.9 1.9 ΩLeakage current of LX pin Ilxl Vout=Vlx=6V 1 μAOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzVoltage limit of LX pin(LX switch ON) Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V
Duty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°CELM91301xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.34 /
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=3V 4.875 5.000 5.125 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 0.9 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95 20 45 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of LX switch Ron Vout=Vout(T)×0.95 0.7 1.5 ΩLeakage current of LX pin Ilxl Vout=Vlx=6V 1 μAOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzVoltage limit of LX pin(LX switch ON) Vlxlim Vout=Vout(T)×0.95 0.5 0.7 0.9 V
Duty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°CELM91501xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=1.5V 1.755 1.800 1.845 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 1.1 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95, EXT: No-Load 10 25 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of EXT “High” Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 90 170 ΩOn-resistance of EXT “Low” Rextl Vout=Vout(T)×0.95, Vext=0.4V 70 120 ΩOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzDuty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°CELM91183xA
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=1.5V 2.925 3.000 3.075 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 1.1 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95, EXT: No-Load 14 35 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of EXT “High” Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 50 86 ΩOn-resistance of EXT “Low" Rextl Vout=Vout(T)×0.95, Vext=0.4V 36 60 ΩOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzDuty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°CELM91303xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
■Electrical characteristics (ELM91xx3xA)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.35 /
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=1.5V 3.218 3.300 3.382 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 1.1 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 Iss1 Vout=Vout(T)×0.95, EXT: No-Load 15 35 μACurrent consumption 2 Iss2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of EXT “High” Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 46 83 ΩOn-resistance of EXT “Low” Rextl Vout=Vout(T)×0.95, Vext=0.4V 33 55 ΩOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzDuty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°CELM91333xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
Parameter Symbol Condition Min. Typ. Max. UnitOutput voltage Vout Iout=1mA, Vin=3V 4.875 5.000 5.125 VInput voltage Vin 0.9 6.0 VStarting voltage Vst Iout=1mA 1.1 VHolding voltage Vhold Iout=1mA 0.7 VCurrent consumption 1 ISS1 Vout=Vout(T)×0.95, EXT: No-Load 20 45 μACurrent consumption 2 ISS2 Vout=Vout(T)+0.5V 2 5 μAOn-resistance of EXT "High" Rexth Vout=Vout(T)×0.95, Vext=Vout-0.4V 33 59 ΩOn-resistance of EXT "Low" Rextl Vout=Vout(T)×0.95, Vext=0.4V 24 45 ΩOscillating frequency Fosc Vout=Vout(T)×0.95 80 100 120 kHzDuty ratio Duty Vout=Vout(T)×0.95 67 75 83 %
FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°CELM91503xA
* Vout: Input voltage to out pin; Vout(T): Typ. value of Vout.
■Marking
SOT-89
• SOT-89, SOT-23 package : ELM91xx1xA ELM91xx3xA
SOT-23
a to c : Assembly lot No. A to Z (I, O, X excepted) and 0 to 9
• SC-70-5 package : ELM91xxxCA
SC-70-5
a to d : Assembly lot No. A to Z (I, O, X excepted) and 0 to 9
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.36 /
■External parts
1) Coil
2) Diode
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)
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)
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) CapacitorWhen 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 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 { 0.1 ohm ~ a few ohm } in series with output capacitor. The output voltage of ELM91xx3xA 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 ELM91303xA, when Vin=1.5V.{Cin=100μF(Ta), L=33μH}
0 100 200 300 400 500 600 700 8001
1.5
2
2.5
3
3.5
100�F(Ta)
330�F(Ta)
Vout-Iout
Iout (mA)
Vou
t (V
)
1000�F(AL)
200 400 600 800 10000
100
200
300
400
500
600
100�F(Ta)
1000�F(AL)
RIPPLE VOLTAGE-Iout
Iout (mA)
RIP
PLE
VO
LTA
GE
(mV
)
330�F(Ta)
0 100 200 300 400 500 600 700 80040
50
60
70
80
90
100
100�F(Ta)
1000�F(AL)
EFFICIENCY-Iout
Iout (mA)
EFFI
CIE
NC
Y (%
)
330�F(Ta)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.37 /
0 0.5 1 1.5 20.5
1
1.5
2
2.5
Vin (V)
Vou
t(V
)
Iout=1mA
Iout=10mAIout=40mA
Vout-Vin
0.1 1 10 100 10000.5
1
1.5
2
2.5
Iout (mA)
Vou
t(V
) Vin=0.9V
1.1V
1.3V
Vout-Iout
1.5V
0.1 1 10 100 100040
50
60
70
80
90
100
Iout (mA)
EFFI
CIE
NC
Y(%
)
Vin=0.9V
1.1V
1.3V
EFFICIENCY-Iout
1.5V
0 20 40 60 80 100 120 140 160 180 2000
20
40
60
80
100
Iout (mA)
RIP
PLE
VO
LTA
GE(
mV
)
Vin=0.9V
1.1V
1.3V
RIPPLE VOLTAGE-Iout
1.5V
■Typical characteristics (ELM91xx1xA)
• ELM91181xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.38 /
0 100 200 300 400 500 600 700 800 900
1.75
1.8
1.85
1.9
1.95
2
Time(μS)
Out
put V
olta
ge(V
)
Load Transient Response
Output Voltage
Output Current
50mA
1mA
0 100 200 300 400 500 600 700 800 900
1.75
1.8
1.85
1.9
1.95
2
Time(μS)O
utpu
t Vol
tage
(V)
Load Transient Response
Output Voltage
Output Current
50mA
1mA
0 3 6 9 12 150.5
0.6
0.7
0.8
0.9
1
1.1
Iout (mA)
Vst
(V)
Vst-Iout
0 3 6 9 12 150
100
200
300
400
500
600
700
800
900
Iout (mA)
Vho
ld(m
V)
Vhold-Iout
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.39 /
0 0.5 1 1.5 2 2.5 30.5
1
1.5
2
2.5
3
3.5
Vin (V)
Vou
t(V
) Iout=1mAIout=10mA
Iout=40mA
Vout-Vin
0.1 1 10 100 10001.5
2
2.5
3
3.5
Iout (mA)
Vou
t(V
)
Vin=0.9V
1.1V
1.8V
Vout-Iout
1.5V
2.4V
0.1 1 10 100 100040
50
60
70
80
90
100
Iout (mA)
EFFI
CIE
NC
Y(%
)
Vin=0.9V
1.1V
1.8V
EFFICIENCY-Iout
1.5V
2.4V
0 20 40 60 80 100 120 140 160 180 2000
20
40
60
80
100
120
140
160
180
200
Iout(mA)
RIP
PLE
VO
LTA
GE(
mV
)
Vin=0.9V
1.1V
1.8V
RIPPLE VOLTAGE-Iout
1.5V
2.4V
• ELM91301xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.310 /
0 100 200 300 400 500 600 700 800 900
2.95
3
3.05
3.1
3.15
3.2
Out
put V
olta
ge(V
)
Load Transient Response
Time(μS)
Output Voltage
Output Current
50mA
1mA
0 100 200 300 400 500 600 700 800 900
2.95
3
3.05
3.1
3.15
3.2
Time(μS)O
utpu
t Vol
tage
(V)
Load Transient Response
Output Current
50mA
1mA
Output Voltage
0 3 6 9 12 150.5
0.6
0.7
0.8
0.9
1
1.1
Iout (mA)
Vst
(V)
Vst-Iout
0 3 6 9 12 150
100
200
300
400
500
600
700
800
900
Iout(mA)
Vho
ld(m
V)
Vhold-Iout
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.311 /
0 0.5 1 1.5 2 2.5 30.5
1
1.5
2
2.5
3
3.5
4
Vin (V)
Vou
t(V
)
Iout=1mA
Iout=10mA
Iout=40mA
Vout-Vin
0.1 1 10 100 10001.5
2
2.5
3
3.5
4
Iout (mA)
Vou
t(V
)
Vin=0.9V
1.1V
1.8V
Vout-Iout
1.5V
2.4V
0.1 1 10 100 100040
50
60
70
80
90
100
Iout (mA)
EFFI
CIE
NC
Y(%
)
Vin=0.9V
1.1V
1.8V
EFFICIENCY-Iout
1.5V
2.4V
0 20 40 60 80 100 120 140 160 180 2000
20
40
60
80
100
120
140
160
180
200
Iout (mA)
RIP
PLE
VO
LTA
GE(
mV
)
Vin=0.9V
1.1V
1.8V
RIPPLE VOLTAGE-Iout
1.5V
2.4V
• ELM91331xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.312 /
0 100 200 300 400 500 600 700 800 900
3.25
3.3
3.35
3.4
3.45
3.5
Out
put V
olta
ge(V
)
Time(μS)
Output Voltage
Load Transient Response
Output Current
50mA
1mA
0 100 200 300 400 500 600 700 800 900
3.25
3.3
3.35
3.4
3.45
3.5
Time(μS)O
utpu
t Vol
tage
(V)
Load Transient Response
Output Voltage
Output Current
50mA
1mA
0 3 6 9 12 150.5
0.6
0.7
0.8
0.9
1
1.1
Iout (mA)
Vst
(V)
Vst-Iout
0 3 6 9 12 150
100
200
300
400
500
600
700
800
900
1000
Iout (mA)
Vho
ld(m
V)
Vhold-Iout
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.313 /
0 0.5 1 1.5 2 2.5 30.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Vin (V)
Vou
t(V
)
Iout=1mAIout=10mA
Iout=40mA
Vout-Vin
0.1 1 10 100 10003
3.5
4
4.5
5
5.5
Iout (mA)
Vou
t(V
)
Vin=0.9V
1.1V
1.8V
Vout-Iout
1.5V
3.0V
0.1 1 10 100 100040
50
60
70
80
90
100
Iout (mA)
EFFI
CIE
NC
Y(%
)
Vin=0.9V
1.1V
1.8V
EFFICIENCY-Iout
1.5V
3.0V
0 20 40 60 80 100 120 140 160 180 2000
20
40
60
80
100
120
140
160
Iout (mA)
RIP
PLE
VO
LTA
GE(
mV
)
Vin=0.9V
1.1V
1.8V
RIPPLE VOLTAGE-Iout
1.5V
3.0V
• ELM91501xA(L=100μH, Cin=Cout=47μF, D=MA2Z748, Top=25°C)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.314 /
0 100 200 300 400 500 600 700 800 900
4.95
5
5.05
5.1
5.15
5.2
Out
put V
olta
ge(V
)
Load Transient Response
Time(μS)
Output Voltage
0 100 200 300 400 500 600 700 800 900
4.95
5
5.05
5.1
5.15
5.2
Time(μS)O
utpu
t Vol
tage
(V)
Load Transient Response
Output Voltage
Output Current
50mA
1mA
0 3 6 9 12 150.5
0.6
0.7
0.8
0.9
1
1.1
Iout (mA)
Vst
(V)
Vst-Iout
0 3 6 9 12 15
200
400
600
800
1000
1200
1400
1600
1800
2000
Iout (mA)
Vho
ld(m
V)
Vhold-Iout
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
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Rev.1.315 /
• ELM91183xA (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C)
��
0 0.5 1 1.5 20.5
1
1.5
2
2.5
Iout=300mA
Iout=100mA
Iout=10mA
Vout-Vin
Vin (V)
Vou
t (V
)
� �������������������������������������������������������������������������������� �
����������������������������������������������������������
0.1 1 10 100 10000.5
1
1.5
2
2.5
Vin=0.9V
Vin=1.1V
Vin=1.5V
Vout-Iout
Vou
t (V
)Vin=1.3V
0.1 1 10 100 100040
50
60
70
80
90
100
Vin=0.9V
Vin=1.1V
Vin=1.5V
EFFICIENCY-Iout
Iout (mA)
EFFI
CIE
NC
Y (%
)
Vin=1.3V
0 200 400 600 800 10000
100
200
300
400
500
600
700
800
Vin=0.9V
Vin=1.1V
Vin=1.5V
RIPPLE VOLTAGE-Iout
Iout (mA)
RIP
PLE
VO
LTA
GE
(mV
) Vin=1.3V
■Typical characteristics (ELM91xx3xA)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.316 / ��
0 200 400 600 800 10001.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
Vout
Load Transient Response
Time (�s)
Vou
t (V
)
Iout
1mA
100mA
Vin=1.2V
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0 200 400 600 800 10001.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
Vout
Load Transient Response
Time (�s)
Vou
t (V
)
Iout
1mA
100mA
Vin=1.2V
0 20 40 60 80 1000.8
0.9
1
1.1
1.2
1.3Vst-Iout
Iout (mA)
Vst
(V)
0 20 40 60 80 1000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8Vhold-Iout
Iout (mA)
Vho
ld (V
)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.317 /
• ELM91303xA (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C)
��
0 0.5 1 1.5 2 2.5 31
1.5
2
2.5
3
3.5
Iout=300mA
Iout=100mA
Iout=10mA
Vout-Vin
Vin (V)
Vou
t (V
)
� �������������������������������������������������������������������������������� �
����������������������������������������������������������
0.1 1 10 100 10001
1.5
2
2.5
3
3.5
Vin=0.9V
Vin=1.1V
Vin=2.4V
Vout-Iout
Vou
t (V
)
Vin=1.5V
Vin=1.8V
0.1 1 10 100 100040
50
60
70
80
90
100
Vin=0.9V
Vin=1.1V
Vin=2.4V
EFFICIENCY-Iout
Iout (mA)
EFFI
CIE
NC
Y (%
)
Vin=1.5V
Vin=1.8V
200 400 600 800 10000
100
200
300
400
500
600
700
800
Vin=0.9V
Vin=1.1V
Vin=2.4V
RIPPLE VOLTAGE-Iout
Iout (mA)
RIP
PLE
VO
LTA
GE
(mV
)
Vin=1.5V
Vin=1.8V
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.318 / ��
����������������������������������������������������������
0 200 400 600 800 10002.7
2.75
2.8
2.85
2.9
2.95
3
3.05
3.1
3.15
Vout
Load Transient Response
Time (�s)
Vou
t (V
)
Iout
1mA
100mA
Vin=1.5V
0 200 400 600 800 10002.7
2.75
2.8
2.85
2.9
2.95
3
3.05
3.1
3.15
Vout
Load Transient Response
Vou
t (V
)
Iout
1mA
100mA
Vin=1.5V
0 20 40 60 80 1000.8
0.9
1
1.1
1.2
1.3Vst-Iout
Iout (mA)
Vst
(V)
0 20 40 60 80 1000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Vhold-Iout
Iout (mA)
Vho
ld (V
)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.319 /
• ELM91333xA (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C)
��
0 0.5 1 1.5 2 2.5 3 3.51
1.5
2
2.5
3
3.5
4
Iout=300mA
Iout=100mA
Iout=10mA
Vout-Vin
Vin (V)
Vou
t (V
)
� �������������������������������������������������������������������������������� �
����������������������������������������������������������
0.1 1 10 100 10001.5
2
2.5
3
3.5
4
Vin=0.9V
Vin=1.1V
Vin=2.4V
Vout-Iout
Vou
t (V
)Vin=1.5V
Vin=1.8V
0.1 1 10 100 100040
50
60
70
80
90
100
Vin=0.9V
Vin=1.1V
Vin=2.4V
EFFICIENCY-Iout
Iout (mA)
EFFI
CIE
NC
Y (%
)
Vin=1.5V
Vin=1.8V
0 200 400 600 800 10000
100
200
300
400
500
600
700
800
Vin=0.9V
Vin=1.1V
Vin=2.4V
RIPPLE VOLTAGE-Iout
Iout (mA)
RIP
PLE
VO
LTA
GE
(mV
)
Vin=1.5VVin=1.8V
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.320 / ��
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0 200 400 600 800 10003
3.05
3.1
3.15
3.2
3.25
3.3
3.35
3.4
3.45
Vout
Load Transient Response
Time (�s)
Vou
t (V
)
Iout
1mA
100mA
Vin=1.5V
0 200 400 600 800 10003
3.05
3.1
3.15
3.2
3.25
3.3
3.35
3.4
3.45
Vout
Load Transient Response
Vou
t (V
)
Iout
1mA
100mA
Vin=1.5V
0 20 40 60 80 1000.8
0.9
1
1.1
1.2
1.3Vst-Iout
Iout (mA)
Vst
(V)
0 20 40 60 80 1000
0.2
0.4
0.6
0.8
1
1.2Vhold-Iout
Iout (mA)
Vho
ld (V
)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.321 /
• ELM91503xA (FET=ELM37400FA, L=33μH, Cin=Cout=100μF, D=MA735, Vss=0V, Top=25°C)
��
0 1 2 3 4 52.5
3
3.5
4
4.5
5
5.5
Iout=300mA
Iout=100mA
Iout=10mA
Vout-Vin
Vin (V)
Vou
t (V
)
� �������������������������������������������������������������������������������� �
����������������������������������������������������������
0.1 1 10 100 10003
3.5
4
4.5
5
5.5
Vin=0.9V
Vin=1.1V
Vin=3.0V
Vout-Iout
Vou
t (V
)
Vin=1.5V
Vin=1.8V
0.1 1 10 100 100040
50
60
70
80
90
100
Vin=0.9V
Vin=1.1V
Vin=3.0V
EFFICIENCY-Iout
Iout (mA)
EFFI
CIE
NC
Y (%
)
Vin=1.5V
Vin=1.8V
0 200 400 600 800 10000
100
200
300
400
500
600
Vin=0.9VVin=1.1V
Vin=3.0V
RIPPLE VOLTAGE-Iout
Iout (mA)
RIP
PLE
VO
LTA
GE
(mV
)
Vin=1.5V
Vin=1.8V
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22
http://www.elm-tech.com
Rev.1.322 / ��
����������������������������������������������������������
0 200 400 600 800 10004.7
4.75
4.8
4.85
4.9
4.95
5
5.05
5.1
5.15
Vout
Load Transient Response
Time (�s)
Vou
t (V
)
Iout
1mA
100mA
Vin=2.4V
0 200 400 600 800 10004.7
4.75
4.8
4.85
4.9
4.95
5
5.05
5.1
5.15
Vout
Load Transient Response
Vou
t (V
)
Iout
1mA
100mA
Vin=2.4V
0 20 40 60 80 1000.8
0.9
1
1.1
1.2
1.3Vst-Iout
Iout (mA)
Vst
(V)
0 20 40 60 80 1000
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6Vhold-Iout
Iout (mA)
Vho
ld (V
)
ELM91xxxxA CMOS PFM Step-up DC/DC converter and controller
22