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
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■Typical characteristics (ELM91xx3xA)
•�ELM91183xA
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(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
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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
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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
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•�ELM91303xA
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(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
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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
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•�ELM91333xA
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(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
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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
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ELM91503xA
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(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
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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