ELM620BA 1.4MHz
high efficiency synchronous PWM step up DC/DC converter
■Electrical characteristics
Vin=1.2V, Vout=3.3V, Top=25°C, unless otherwise noted
Parameter
Output voltage range (adj.)
Minimum start-up voltage
Minimum operating voltage
Switching frequency
Maximum duty cycle
Current limit delay to output
Feedback voltage
Feedback input current
NMOS switch leakage
PMOS switch leakage
NMOS switch ON resistance
PMOS switch ON resistance
NMOS current limit
Symbol
Vout
Vst
Vin
Fsw
Dmax Vfb=1.15V
tllimdly
Vfb
Condition
Min.
2.5
Typ.
Max. Unit
6.0
1.1
0.75
V
V
V
Iload=1mA
EN=Vin
0.9
0.60
1.4
87
1.1
80
1.7 MHz
%
ns
40
1.165 1.203 1.241
1
V
nA
µA
µA
Ω
Ifb
Vfb=1.22V
IleakN Vsw=5V
0.1
0.1
5.0
5.0
Vsw=0V
Vout=3.3V
Vout=3.3V
IleakP
RswN
RswP
IlimN
Iq
0.35
0.45
950
300
0.1
Ω
700
1
mA
µA
µA
V
Quiescent current (Active)
Shutdown current
EN input high
EN input low
EN input current
Measured on Vout, Non-switching
Ven=0V, Including switch leakage
500
1.0
Is
Venh
Venl
Ien
0.35
1.00
V
µA
Ven=5.5V
0.01
■Test circuits
L=2.2µH
SBD
SW
VOUT
ELM620BA
EN FB
Vout
VIN
R1
Cout=
22µF
Vin
GND
RL
Cin=22µF
R2
Rev.1.0
10 - 4
ELM-TECH [ ELM Technology Corporation ]
