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 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.
■Features
•
•
•
•
•
•
•
Output voltage range
Low voltage operation
Oscillating frequency
Low power operation
High efficiency
Output current(e.g.)
Package
■Application
: 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
Pd
Top
Tstg
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
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
ELM91 x x x x A - x
↑ ↑ ↑ ↑ ↑ ↑
a b c d e f
22 - 1
ELM91xxxxA
CMOS PFM Step-up DC/DC converter and controller
■Pin configuration
SOT-89(TOP VIEW)
SOT-23(TOP VIEW)
3
SC-70(TOP VIEW)
3
1
2
3
1
2
1
2
ELM91xx1AA, ELM91xx3AA
Pin No.
1
2
3
Pin name
VSS
VOUT
ELM91xx1AA: LX
ELM91xx3AA: EXT
ELM91xx1BA, ELM91xx3BA
Pin No.
1
2
3
Pin name
VSS
ELM91xx1BA: LX
ELM91xx3BA: EXT
VOUT
ELM91xx1CA, ELM91xx3CA
Pin No.
1
2
3
Pin name
VSS
ELM91xx1CA: LX
ELM91xx3CA: EXT
VOUT
■Standard circuit
MA2Z748
Vin
H
33
½
MA735
100
½
H
Vin
Cin
47
½
F
+
LX
ELM91xx1xA
VSS
VOUT
Vout
+
Cout
47 F
½
+
Cin
100
½
F
EXT
ELM91xx3xA
VSS
VOUT
Vout
+
Cout
100 F
½
■Block diagram
ELM91xx1xA
LX
Vlx
Limiter
P.F.M.
OSC
Start-up
VOUT
EXT
ELM91xx3xA
VOUT
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
L=100μH, Cin=Cout=47μF, D=MA2Z748, Vss=0V, Top=25°C
Symbol
Condition
Min.
Typ. Max. Unit
Vout Iout=1mA, Vin=1.5V
1.755 1.800 1.845
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
10
25
μA
Iss2 Vout=Vout(T)+0.5V
2
5
μA
Ron Vout=Vout(T)×0.95
1.5
3.0
Ω
Ilxl Vout=Vlx=6V
1
μA
Fosc Vout=Vout(T)×0.95
80
100
120
kHz
Vlxlim Vout=Vout(T)×0.95
Vout(T): Typ. value of Vout.
0.5
67
0.7
75
0.9
83
V
%
* Vout: Input voltage to out pin;
Duty Vout=Vout(T)×0.95
ELM91301xA
* Vout: Input voltage to out pin;
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
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
Vout(T): Typ. value of Vout.
0.5
67
0.7
75
0.9
83
V
%
Duty Vout=Vout(T)×0.95
ELM91331xA
* Vout: Input voltage to out pin;
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
L=100μH, Cin=Cout=47μF, D=MA2Z748, 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
0.9
V
Vhold Iout=1mA
0.7
V
Iss1 Vout=Vout(T)×0.95
15
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
Vout(T): Typ. value of Vout.
0.5
67
0.7
75
0.9
83
V
%
Duty Vout=Vout(T)×0.95
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
L=100μH, Cin=Cout=47μF, D=MA2Z748, 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
0.9
V
Vhold Iout=1mA
0.7
V
Iss1 Vout=Vout(T)×0.95
20
45
μA
Iss2 Vout=Vout(T)+0.5V
2
5
μA
Ron Vout=Vout(T)×0.95
0.7
1.5
Ω
Ilxl Vout=Vlx=6V
1
μA
Fosc Vout=Vout(T)×0.95
80
100
120
kHz
Vlxlim Vout=Vout(T)×0.95
Vout(T): Typ. value of Vout.
0.5
67
0.7
75
0.9
83
V
%
* Vout: Input voltage to out pin;
Duty Vout=Vout(T)×0.95
■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(T): Typ. value of Vout.
* Vout: Input voltage to out pin;
ELM91303xA
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
2.925 3.000 3.075 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
14
35
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
50
86
Ω
On-resistance of EXT “Low"
Rextl Vout=Vout(T)×0.95, Vext=0.4V
36
60
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(T): Typ. value of Vout.
* Vout: Input voltage to out pin;
22 - 4
ELM91xxxxA
CMOS PFM Step-up DC/DC converter and controller
ELM91333xA
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
3.218 3.300 3.382 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
15
35
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
46
83
Ω
On-resistance of EXT “Low”
Rextl Vout=Vout(T)×0.95, Vext=0.4V
33
55
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(T): Typ. value of Vout.
* Vout: Input voltage to out pin;
ELM91503xA
* Vout: Input voltage to out pin;
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=3V
4.875 5.000 5.125 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
20
45
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
33
59
Ω
On-resistance of EXT "Low"
Rextl Vout=Vout(T)×0.95, Vext=0.4V
24
45
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(T): Typ. value of Vout.
■Marking
• SOT-89, SOT-23 package : ELM91xx1xA
ELM91xx3xA
SOT-89
SOT-23
• SC-70 package : ELM91xx1CA
ELM91xx3CA
SC-70
a
c
b
a
b
c d
a
b
c
d
a to c : Assembly lot No.
A to Z (I, O, X excepted) and 0 to 9
a to d : Assembly lot No.
A to Z (I, O, X excepted) and 0 to 9
22 - 5
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