ELM92xxxx CMOS 600kHz High output current PWM step-up DC/DC converter
■Standard circuit
• ELM92xx1x
• ELM92xx2x
᎔ᎈ፺፼
᎔ᎈ፺፼
፹፵፹ᕈᎏ
᎓
ᎊᎌ
ᎰᎵ
፹፵፹ᕈᎏ
᎓
᎖
᎖
ᎰᎵ
ᎊᎰᎵ
ᎌ᎓᎔ᎀ፹ᎿᎿ፸Ꮏ
ᎶᎼᎻ
ᎌ᎓᎔ᎀ፹ᎿᎿ፹Ꮏ
ᎶᎼᎻ
ᎪᎬ
፲
፲
፲
፲
ᎊᎶᎼᎻ
፻ᕈᎍ
ᎊᎰᎵ
፻ᕈᎍ
ᎊᎶᎼᎻ
፻ᕈᎍ
፻ᕈᎍ
■Block diagram
᎖
᎗᎔፧፶፧᎐ᎵᎻᎬᎹᎴᎰᎻᎻᎬᎵᎻ፧ᎴᎶᎫᎬ
ᎊᎶᎵᎻᎹᎶᎳᎬᎹ
᎓
ᎌᎹᎹᎶᎹ፧ᎈᎴᎷ
᎗᎔
፲
፴
ᎊᎶᎴᎷᎨᎹᎨᎻᎶᎹ
፲
᎓፧ᎻᎹᎨᎵᎺᎰᎺᎻᎶᎹ
ᎫᎹᎰᎽᎬᎹ
፴
ᎹᎬᎭ
᎙ᎨᎴᎷ፧ᎨᎽᎬ
ᎎᎬᎵᎬᎹᎨᎻᎶᎹ
ᎊᎼᎹᎹᎬᎵᎻ
᎓ᎰᎴᎰᎻᎬᎹ
ᎊᎌ
ᎊᎌ
ᎊᎶᎵᎻᎹᎶᎳᎬᎹ
᎗ᎯᎨᎺᎬ፧ᎊᎶᎴᎷᎬᎵᎺᎨᎻᎰᎶᎵ
■Electrical characteristics (ELM92xx1x)
L=2.2μH, Cout=47μF, D=MA735, Vss=0V, Top=25°C
Condition Min. Typ. Max. Unit Note
Vout=2.7V (ELM92271x)
Parameter
Symbol
Vin
Vst No-load
Input voltage
Starting voltage
Output voltage1
7
0.9
V
V
V
1
1
Vout1 Iout=60mA, Vin=1.5V
2.633 2.700 2.767
Vout1 Vout1 Vout1
×1.005 ×1.010 ×1.020
Output voltage2
Vout2 Iout=0.1mA, Vin=1.5V
V
1
Current consumption1
Current consumption2
Oscillating frequency
Duty ratio
Iss1 Vout=Vout(T)×0.95
Iss2 Vout=Vout(T)+ 0.5V
Fosc Vout=Vout(T)×0.95
Duty Vout=Vout(T)×0.95
280
70
600
88
450
110
690
95
μA
μA
kHz
%
2
2
3
3
510
80
Frequency of
Fimt
12
17
370
1
kHz
mΩ
μA
3
4
5
intermittent control
On-resistance of LX switch
Leakage current of
LX switch
Ron Vout=Vout(T)×0.95
Ilxl Vout=Vlx=7V
270
Vout
: input voltage to VOUT pin
*
*
*
Vout(T) : typical value of Vout1
Remarks : test circuit No
15 - 3
ELM-TECH [ ELM Technology Corporation ]
