ELM92xxxx
CMOS 600kHz High output current PWM step-up DC/DC converter
■General description
ELM92xxxx is CMOS PWM step-up DC/DC converter which consists of reference voltage source, error
amplifier, oscillation circuit, start-up circuit, output voltage setting resistor, LX transistor and switching current
limiter. For external parts, coil, diode and capacitor are possible choices; with external parts, ELM92 series is
able to acquire constant output voltage higher than input voltage. The standard output voltages are 2.7V, 3.0V,
3.3V, and 5.0V; ELM92 series can also be designed as semi-custom IC within the range of 2.5V to 5.5V by 0.1V
step. Meanwhile, 600kHz high frequency PWM control scheme makes it easy to design DC/DC converter which
can generate large output current with high stability and small ripples by only using small external inductor.
With newly developed intermittent operation control scheme, ELM92 series is able to work with high efficiency
under wide range of load conditions.
■Features
•
•
•
•
•
•
•
•
Output voltage range
Low voltage operation
Oscillating frequency
Output current(e.g.)
CE(Chip-enable pin) available
High efficiency
Switching current limiter
Package
: 2.5V to 5.5V (by 0.1V)
: Vin≥0.9V
: Typ.600kHz
: 250mA (When Vin=1.5V, Vout=3.0V)
: Max. 0.5μA (ELM92xx2x Iss at Shutdown)
: Typ. 85%
: SOT-89, SOT-89-5, SON-6
■Application
• Constant voltage source for battery-operated devices
• Constant voltage source for PDAs, cameras, portable communications equipments and videos
• Local regulator
■Maximum absolute ratings
Parameter
Apply voltage to LX pin
Apply voltage to VOUT pin
Apply voltage to CE pin
Power dissipation
Operating temperature
Storage temperature
Symbol
Vlx
Vout
Vce
Pd
Top
Tstg
Limit
Vss-0.3 to 8.0
Vss-0.3 to 8.0
Vss-0.3 to 8.0
300 (SOT-89)
500 (SOT-89-5)
500 (SON-6)
-40 to +85
-55 to +125
Unit
V
V
V
mW
°C
°C
15 - 1
ELM92xxxx
CMOS 600kHz High output current PWM step-up DC/DC converter
■Selection guide
ELM92xxxx-x
Symbol
e.g. :
27: Vout=2.7V
30: Vout=3.0V
33: Vout=3.3V
50: Vout=5.0V
1: No CE type
(SOT-89, SON-6)
2: CE type
(SOT-89-5, SON-6)
B: SOT-89, SOT-89-5
C: SON-6
S : Refer to PKG file
N : Refer to PKG file
a, b
Output voltage
c
CE selection
ELM92 x x x x - x
↑ ↑ ↑ ↑ ↑
a b c d e
d
e
Package
Taping direction
■Pin configuration
SOT-89 (TOP VIEW)
SOT-89-5 (TOP VIEW)
SON-6 (TOP VIEW)
Pin No.
1
2
3
Pin name
VOUT
VSS
LX
Pin No.
1
2
3
4
5
Pin name
VOUT
VSS
LX
NC
CE
("H"=active,
"L"=shutdown)
Pin No.
1
2
3
4
5
6
Pin name
VOUT
VSS
LX
NC
NC
ELM92xx1C:NC
ELM92xx2C:CE
("H"=active,
"L"=shutdown)
15 - 2
ELM92xxxx
CMOS 600kHz High output current PWM step-up DC/DC converter
■Standard circuit
• ELM92xx1x
• ELM92xx2x
■Block diagram
■Electrical characteristics (ELM92xx1x)
Vout=2.7V (ELM92271x)
Parameter
Input voltage
Starting voltage
Output voltage1
Output voltage2
Current consumption1
Current consumption2
Oscillating frequency
Duty ratio
Frequency of
intermittent control
On-resistance of LX switch
Leakage current of
LX switch
Symbol
Vin
Vst
Vout1
Vout2
Iss1
Iss2
Fosc
Duty
Fimt
Ron
Ilxl
Vout=Vout(T)×0.95
Vout=Vlx=7V
L=2.2μH, Cout=47μF, D=MA735, Vss=0V, Top=25°C
Condition
Min.
Typ.
Max. Unit Note
7
V
No-load
0.9
V
1
Iout=60mA, Vin=1.5V
2.633 2.700 2.767
V
1
Vout1 Vout1 Vout1
Iout=0.1mA, Vin=1.5V
V
1
×1.005 ×1.010 ×1.020
Vout=Vout(T)×0.95
280
450
μA
2
Vout=Vout(T)+ 0.5V
70
110
μA
2
Vout=Vout(T)×0.95
510
600
690
kHz
3
Vout=Vout(T)×0.95
80
88
95
%
3
12
270
17
370
1
kHz
mΩ
μA
3
4
5
: input voltage to VOUT pin
* Vout
* Vout(T) : typical value of Vout1
* Remarks : test circuit No
15 - 3
ELM92xxxx
CMOS 600kHz High output current PWM step-up DC/DC converter
Vout=3.0V (ELM92301x)
Parameter
Input voltage
Starting voltage
Output voltage1
Output voltage2
Current consumption1
Current consumption2
Oscillating frequency
Duty ratio
Frequency of
intermittent control
On-resistance of LX switch
Leakage current of
LX switch
Symbol
Vin
Vst
Vout1
Vout2
Iss1
Iss2
Fosc
Duty
Fimt
Ron
Ilxl
Vout=Vout(T)×0.95
Vout=Vlx=7V
L=2.2μH, Cout=47μF, D=MA735, Vss=0V, Top=25°C
Condition
Min.
Typ.
Max. Unit Note
7
V
No-load
0.9
V
1
Iout=60mA, Vin=1.5V
2.925 3.000 3.075
V
1
Vout1 Vout1 Vout1
Iout=0.1mA, Vin=1.5V
V
1
×1.005 ×1.010 ×1.020
Vout=Vout(T)×0.95
300
480
μA
2
Vout=Vout(T)+0.5V
75
120
μA
2
Vout=Vout(T)×0.95
510
600
690
kHz
3
Vout=Vout(T)×0.95
80
88
95
%
3
12
250
17
340
1
kHz
mΩ
μA
3
4
5
: input voltage to VOUT pin
* Vout
* Vout(T) : typical value of Vout1
* Remarks : test circuit No
Vout=3.3V (ELM92331x)
Parameter
Input voltage
Starting voltage
Output voltage1
Output voltage2
Current consumption1
Current consumption2
Oscillating frequency
Duty ratio
Frequency of
intermittent control
On-resistance of LX switch
Leakage current of
LX switch
Symbol
Vin
Vst
Vout1
Vout2
Iss1
Iss2
Fosc
Duty
Fimt
Ron
Ilxl
L=2.2μH, Cout=47μF, D=MA735, Vss=0V, Top=25°C
Condition
Min.
Typ.
Max. Unit Note
7
V
No-load
0.9
V
1
Iout=60mA, Vin=1.5V
3.218 3.300 3.382
V
1
Vout1 Vout1 Vout1
Iout=0.1mA, Vin=1.5V
V
1
×1.005 ×1.010 ×1.020
Vout=Vout(T)×0.95
320
510
μA
2
Vout=Vout(T)+0.5V
80
130
μA
2
Vout=Vout(T)×0.95
510
600
690
kHz
3
Vout=Vout(T)×0.95
80
88
95
%
3
12
Vout=Vout(T)×0.95
Vout=Vlx=7V
245
17
330
1
kHz
mΩ
μA
3
4
5
: input voltage to VOUT pin
* Vout
Vout(T) : typical value of Vout1
*
* Remarks : test circuit No
15 - 4
ELM92xxxx
CMOS 600kHz High output current PWM step-up DC/DC converter
Vout=5.0V (ELM92501x)
Parameter
Input voltage
Starting voltage
Output voltage1
Output voltage2
Current consumption1
Current consumption2
Oscillating frequency
Duty ratio
Frequency of
intermittent control
On-resistance of LX switch
Leakage current of
LX switch
Symbol
Vin
Vst
Vout1
Vout2
Iss1
Iss2
Fosc
Duty
Fimt
Ron
Ilxl
Vout=Vout(T)×0.95
Vout=Vlx=7V
L=2.2μH, Cout=47μF, D=MA735, Vss=0V, Top=25°C
Condition
Min.
Typ.
Max. Unit Note
7
V
No-load
0.9
V
1
Iout=60mA, Vin=3V
4.875 5.000 5.125
V
1
Vout1 Vout1 Vout1
Iout=0.1mA, Vin=3V
V
1
×1.005 ×1.010 ×1.020
Vout=Vout(T)×0.95
550
880
μA
2
Vout=Vout(T)+0.5V
90
145
μA
2
Vout=Vout(T)×0.95
510
600
690
kHz
3
Vout=Vout(T)×0.95
80
88
95
%
3
12
220
17
300
1
kHz
mΩ
μA
3
4
5
: input voltage to VOUT pin
* Vout
* Vout(T) : typical value of Vout1
* Remarks : test circuit No
■Electrical characteristics (ELM92xx2x)
Vout=2.7V (ELM92272x)
Parameter
Input voltage
Starting voltage
Output voltage1
Output voltage2
Current consumption1
Current consumption2
Current consumption
in Shutdown
Oscillating frequency
Duty ratio
Frequency of
Intermittent control
On-resistance of LX switch
Leakage current of LX switch
CE Input voltage "H"
CE Input voltage "L"
CE Input current "H"
CE Input current "L"
* Vout : input voltage to VOUT pin
* Vce : input voltage to CE pin
Vce=Vout, L=2.2μH, Cout=47μF, D=MA735, Vss=0V, Top=25°C
Symbol
Condition
Min.
Typ.
Max. Unit Note
Vin
7
V
Vst No-load
0.9
V
1
Vout1 Iout=60mA, Vin=1.5V
2.633 2.700 2.767
V
1
Vout1 Vout1 Vout1
Vout2 Iout=0.1mA, Vin=1.5V
V
1
×1.005 ×1.010 ×1.020
Iss1 Vout=Vout(T)×0.95
280
450
μA
2
Iss2 Vout=Vout(T)+0.5V
70
110
μA
2
Isd
Vout=Vout(T)×0.95, Vce=0
510
80
600
88
12
270
0.8
0.25
0.1
-0.1
0.5
690
95
17
370
1
μA
kHz
%
kHz
mΩ
μA
V
V
μA
μA
2
3
3
3
4
5
6
6
6
6
Fosc Vout=Vout(T)×0.95
Duty Vout=Vout(T)×0.95
Fimt
Ron Vout=Vout(T)×0.95
Ilxl Vout=Vlx=7V
Vceh
Vcel
Vout=Vout(T)×0.95,
Iceh
Vce=Vout(T)×0.95
Icel Vout=Vout(T)×0.95, Vce=0
* Vout(T) : typical value of Vout1
* Remarks : test circuit No
15 - 5
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