ELM611DA 2A 23V
high efficiency synchronous PWM step down DC/DC converter
■Electrical characteristics
Vin=+12V, Top=+25°C, unless otherwise noted.
Parameter
Supply voltage
Output voltage
Shutdown current
Supply current
Feedback voltage
Symbol
Vin
Vout
Is
Iss
Vfb
Test condition
Min.
4.75
0.923
Typ.
Max. Unit
23.00
18.000
3
V
V
µA
mA
V
Ven = 0V
Ven = 2.0V, Vfb = 1.0V
4.75V ≤ Vin ≤ 23V
1
1.3
1.5
0.900 0.923 0.946
Feedback over-voltage threshold
Error amplifier voltage gain
Error amplifier transconductance
High-side switch-on resistance
Low-side switch-on resistance
High-side switch leakage current
Upper switch current limit
Lower switch current limit
COMP to current sense transconductance
Oscillation frequency
Vfbo-th
Aea
Gea
Rds(on)1
Rds(on)2
Ileak Ven = 0V, Vsw = 0V
Ilim_usw Minimum duty cycle
Ilim_lsw From drain to source
Gcs
1.1
400
800
85
V
V/V
µA/V
mΩ
mΩ
µA
A
∆Ic = ±10µA
85
10
2.4
3.4
1.1
3.5
350
100
90
A
A/V
kHz
kHz
%
ns
V
Fosc1
Short circuit oscillation frequency
Maximum duty cycle
Minimum on time
Fosc2 Vfb = 0V
Dmax Vfb = 1.0V
To
220
1.6
EN shutdown threshold voltage
Vens_th Ven rising
1.3
1.9
EN shutdown threshold
voltage hysteresis
Input under voltage lockout threshold
Input under voltage lockout threshold
hysteresis
Vens_hys
10
mV
V
Vth
Vin rising
3.80
4.10
210
4.40
Vth_hys
mV
Soft-start current
Soft-start period
Thermal shutdown
Isoft Vss = 0V
Psoft Vss = 0.1µF
Tsd
6
15
160
µA
ms
°C
■Test circuits
C3=10nF
L=10µH
Cin=10µF
VIN
EN
BS
Vout
RL
SW
ELM611DA
Ven=3V
R1
SS
FB
Cout=22µF
GND COMP
Vin
C2=
0.1µF
C1=3.3nF
R3=2.2k
R2
�
Rev.1.2
11 - 3
ELM-TECH [ ELM Technology Corporation ]
