ELM-TECH ELM9550D-S

ELM95xxD CMOS PWM step-up DC/DC converter
■General description
ELM95xxD series is CMOS PWM step-up DC/DC converter which consists of reference voltage source, error
amplifier, oscillation circuit, start-up circuit, PWM control circuit, switch transistor and output voltage setting
resistor. For external parts, coil, diode and capacitor are possible choices; with external parts, ELM95 series
can acquire constant output voltage higher than input voltage. The standard output voltages are 2.7V,3.0V,3.3V
and 5.0V; ELM95 series can also be designed as semi-custom IC within the range of 2.5V to 5.5V by 0.1V step.
With newly-developed PWM control circuit, ELM95 series is able to modulate switching time smoothly with
constant frequency and consequently generates stable output with small ripples.
■Features
■Application
•
•
•
•
•
•
•
•
•
• Constant voltage source for batteryoperated devices
• Constant voltage source for cameras
• Portable communication equipments
• Local regulator
Output voltage range
: 2.5V to 5.5V (by 0.1V)
Low voltage operation
: Vin≥0.98V (RL=30kΩ)
Low power operation
: 35μW (Typ. ELM9530D)
High efficiency
: Typ. 85%
High output voltage accuracy : ±2.5%
Output current (e.g.)
: 10mA (When Vin=1.5V, Vout=3.0V)
Constant output frequency : Typ. 55kHz
Small ripples
Package
: SOT-89
■Maximum absolute ratings
Parameter
Apply voltage to LX pin
Apply voltage to VOUT pin
Output current of LX pin
Power dissipation
Operating temperature
Storage temperature
Symbol
Vlx
Vout
Ilx
Pd
Top
Tstg
Limit
12
12
200
300
-40 to +85
-55 to +125
Unit
V
V
mA
mW
°C
°C
■Selection guide
ELM95xxD-x
Symbol
a, b
Output voltage
c
Product version
d
Taping direction
e.g.:
27: Vout=2.7V
30: Vout=3.0V
33: Vout=3.3V
50: Vout=5.0V
D
S : Refer to PKG file
N : Refer to PKG file
5- 1
ELM95 x x D - x
↑ ↑ ↑ ↑
a b c d
ELM95xxD CMOS PWM step-up DC/DC converter
■Pin configuration
SOT-89 (TOP VIEW)
Pin No.
1
2
3
■Standard circuit
Pin name
VSS
VOUT
LX
■Block diagram
㪤㪘㪎㪉㪈
㪣㪯
㪧㪅㪮㪅㪤㪅
㪭㪦㪬㪫
㪉㪉㪇㱘㪟
㪭㫀㫅
㪣㪯
㪜㪣㪤㪐㪌㫏㫏㪛
㪭㪦㪬㪫
㪭㫆㫌㫋
㪂
㪭㪪㪪
㪋㪎㱘㪝
㪭㫉㪼㪽
㪪㫋㪸㫉㫋㪄㫌㫇
㪦㫊㪺㫀㫃㫃㪸㫋㫆㫉
㪭㪪㪪
■Electrical characteristics
Vout=2.7V (ELM9527D)
Parameter
Input voltage
Starting voltage
Holding voltage
Current consumption
Output voltage
Output current of LX pin
Leakage current of LX pin
Oscillating frequency
Maximum duty ratio
Symbol
Vin
Vst
Vhold
Iss
Vout
Ilx
Ilxl
Fosc
Duty
L=220μH, D=MA721, C=47μF, Vss=0V, Top=25°C
Condition
Min. Typ. Max. Unit
10
V
RL=27kΩ
0.98
V
Iout=1mA
0.7
V
Vin=1.5V
9.0
18.0
μA
Iout=1mA, Vin=1.5V
2.63 2.70
2.77
V
Vout=2.6V, Vlx=0.4V
70
mA
Vout=Vlx=10V
1.0
μA
Vout=2.6V
35
55
75
kHz
Vout=2.6V
45
60
75
%
Symbol
Vin
Vst
Vhold
Iss
Vout
Ilx
Ilxl
Fosc
Duty
L=220μH, D=MA721, C=47μF, Vss=0V, Top=25°C
Condition
Min. Typ. Max. Unit
10
V
RL=30kΩ
0.98
V
Iout=1mA
0.7
V
Vin=1.5V
12.0 20.0
μA
Iout=1mA, Vin=1.5V
2.92
3.00 3.08
V
Vout=2.9V, Vlx=0.4V
80
mA
Vout=Vlx=10V
1.0
μA
Vout=2.9V
35
55
75
kHz
Vout=2.9V
45
60
75
%
Vout=3.0V (ELM9530D)
Parameter
Input voltage
Starting voltage
Holding voltage
Current consumption
Output voltage
Output current of LX pin
Leakage current of LX pin
Oscillating frequency
Maximum duty ratio
5- 2
ELM95xxD CMOS PWM step-up DC/DC converter
Symbol
Vin
Vst
Vhold
Iss
Vout
Ilx
Ilxl
Fosc
Duty
L=220μH, D=MA721, C=47μF, Vss=0V, Top=25°C
Condition
Min. Typ. Max. Unit
10
V
RL=33kΩ
0.98
V
Iout=1mA
0.7
V
Vin=1.5V
14.0
23.0
μA
Iout=1mA, Vin=1.5V
3.21 3.30
3.39
V
Vout=3.2V, Vlx=0.4V
80
mA
Vout=Vlx=10V
1.0
μA
Vout=3.2V
35
55
75
kHz
Vout=3.2V
45
60
75
%
Symbol
Vin
Vst
Vhold
Iss
Vout
Ilx
Ilxl
Fosc
Duty
L=220μH, D=MA721, C=47μF, Vss=0V, Top=25°C
Condition
Min. Typ. Max. Unit
10
V
RL=50kΩ
0.98
V
Iout=1mA
0.9
V
Vin=3V
30.0
45.0
μA
Iout=1mA, Vin=3V
4.87 5.00
5.13
V
Vout=4.8V, Vlx=0.4V
110
mA
Vout=Vlx=10V
1.0
μA
Vout=4.8V
35
55
75
kHz
Vout=4.8V
45
60
75
%
Vout=3.3V (ELM9533D)
Parameter
Input voltage
Starting voltage
Holding voltage
Current consumption
Output voltage
Output current of LX pin
Leakage current of LX pin
Oscillating frequency
Maximum duty ratio
Vout=5.0V (ELM9550D)
Parameter
Input voltage
Starting voltage
Holding voltage
Current consumption
Output voltage
Output current of LX pin
Leakage current of LX pin
Oscillating frequency
Maximum duty ratio
■Marking
SOT-89
㪸
㪺
㪹
㪻
a : the integer digit of the output voltage
Mark
Vout
Mark
2
2.*V
4
3
3.*V
5
Vout
4.*V
5.*V
b : the decimal digit of the output voltage
Mark
Vout
Mark
0
5
*.0V
1
.1V
6
*
2
7
*.2V
3
8
*.3V
4
9
*.4V
Vout
*.5V
*.6V
*.7V
*.8V
*.9V
c : Assembly lot No.
A to Z (excepted I, O, X)
d : Assembly lot No.
0 to 9
5- 3
ELM95xxD CMOS PWM step-up DC/DC converter
■External parts
To design DC/DC converter with ELM95 series, coil, diode, and capacitor are necessary.
(Refer to standard circuit configuration.)
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.
For ELM95 series, ELM recommends following coil.
• CM-5/CM-5N (Sumida Electric Co., Ltd.)
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 ELM95 series, ELM recommends schottoky diodes.
3) Capacitor
When choosing capacitor, please select that whose capacity is comparatively large and voltage limit is at
least three times larger than rated output voltage of used ELM95 series. For ELM95 series, ELM recommends to use “Aluminum electrolytic capacitor”. When using capacitors such as “Tantalum capacitor” or
“Laminated ceramic capacitor”, there may be cases that few hundred hertz wave motion will happen in output voltage wave form. Under such circumstances, ELM recommends connecting resistance (1.0Ω approx.)
to capacitor serially as following.
㪈㪅㪇㱅
㪣㪯
㪜㪣㪤㪐㪌㫏㫏㪛
㪭㫆㫌㫋
㪂
㪭㪦㪬㪫
㪫㪸㫅㫋㪸㫃㫌㫄
㪚㫆㫅㪻㪼㫅㫊㪼㫉
㪭㪪㪪
■Typical characteristics
• Vout=2.7V (ELM9527D)
(Top=25°C, L=220μH, D=MA721, C=47μF)
EFFICIENCY-Vin
Efficiency,VRp-p - Vin (Iout =1mA)
RIPPLE VOLTAGE-Vin
Vout - Vin
100
50
Vout (V)
3
Iout =1mA
2
3mA
10mA
1
0
1
Vin (V)
90
40
80
30
VRp-p
RIPPLE VOLTAGE
70
60
50
2
5- 4
20
10
0
1
Vin (V)
2
0
RIPPLE VOLTAGE
VRp-p (mV)(mA)
EFFICIENCY
Efficiency (%)
(%)
EFFICIENCY
EFFICIENCY
ELM95xxD CMOS PWM step-up DC/DC converter
• Vout=3.0V (ELM9530D)
(Top=25°C, L=220μH, D=MA721, C=47μF)
EFFICIENCY-Vin
Efficiency,VRp-p - Vin (Iout=1mA)
RIPPLE VOLTAGE-Vin
Vout - Vin
50
100
Vout (V)
3
Iout =1mA
2
3mA
10mA
1
0
1
Vin (V)
2
40
80
30
RIPPLEVRp-p
VOLTAGE
70
20
10
60
50
3
• Vout=3.3V (ELM9533D)
90
0
1
2
Vin (V)
3
VRp-p (mV)(mA)
RIPPLE VOLTAGE
Efficiency (%)
(%)
EFFICIENCY
Efficiency
EFFICIENCY
0
(Top=25°C, L=220μH, D=MA721, C=47μF)
EFFICIENCY-Vin
Efficiency,VRp-p - Vin (Iout =1mA)
RIPPLE VOLTAGE-Vin
Vout - Vin
50
100
Vout (V)
3
Iout =1mA
2
3mA
10mA
1
0
1
Vin (V)
2
40
80
30
RIPPLEVRp-p
VOLTAGE
70
20
10
60
50
3
• Vout=5.0V (ELM9550D)
90
0
1
Vin (V)
2
3
VRp-p (mV)(mA)
RIPPLE VOLTAGE
Efficiency (%)
(%)
EFFICIENCY
EFFICIENCY
Efficiency
0
(Top=25°C, L=220μH, D=MA721, C=47μF)
EFFICIENCY-Vin
Efficiency,VRp-p - Vin (Iout =1mA)
RIPPLE VOLTAGE-Vin
Vout - Vin
100
50
Vout (V)
5
Iout =1mA
4
3mA
10mA
3
0
1
Vin (V)
2
90
40
80
30
70
RIPPLEVRp-p
VOLTAGE 20
60
10
50
3
5- 5
0
1
2
3
Vin (V)
4
5
0
VRp-p (mV)(mA)
RIPPLE VOLTAGE
EFFICIENCY
Efficiency (%)
Efficiency
EFFICIENCY