Datasheet

LTC3614
3
3614fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating junction
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, RT/SYNC = SV
IN
unless otherwise specifi ed (Notes 1, 2, 11).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range
l
2.25 5.5 V
V
UVLO
Undervoltage Lockout Threshold SV
IN
Ramping Down
SV
IN
Ramping Up
l
l
1.7
2.25
V
V
V
FB
Feedback Voltage Internal Reference (Note 3) V
TRACK
= SV
IN
, V
DDR
= 0V
0°C < T
J
< 85°C
–40°C < T
J
< 125°C
l
0.594
0.591
0.6 0.606
0.609
V
V
Feedback Voltage External Reference
(Note 7)
(Note 3) V
TRACK
= 0.3V, V
DDR
= SV
IN
0.288 0.300 0.312 V
(Note 3) V
TRACK
= 0.5V, V
DDR
= SV
IN
0.488 0.500 0.512 V
I
FB
Feedback Input Current V
FB
= 0.6V
l
±30 nA
ΔV
LINEREG
Line Regulation SV
IN
= PV
IN
= 2.25V to 5.5V
(Notes 3, 4) TRACK/SS = SV
IN
l
0.2 %/V
ΔV
LOADREG
Load Regulation ITH from 0.5V to 0.8V (Notes 3, 4)
V
ITH
= SV
IN
(Note 5)
0.25
2.6
%
%
I
S
Active Mode Supply Current V
FB
= 0.5V, V
MODE
= SV
IN
(Note 6) 1100 µA
Sleep Mode Supply Current V
FB
= 0.7V, V
MODE
= 0V, ITH = SV
IN
(Note 5)
75 100 µA
V
FB
= 0.7V, V
MODE
= 0V (Note 4) 130 175 µA
Shutdown Current SV
IN
= PV
IN
= 5.5V, V
RUN
= 0V 0.1 1 µA
R
DS(ON)
Top Switch On-Resistance PV
IN
= 3.3V (Note 10) 35 m
Bottom Switch On-Resistance PV
IN
= 3.3V (Note 10) 25 m
I
LIM
Top Switch Current Limit Sourcing (Note 8), V
FB
= 0.5V
Duty Cycle <35%
Duty Cycle = 100%
7.5
5.3
9 10.5 A
A
Bottom Switch Current Limit Sinking (Note 8), V
FB
= 0.7V,
Forced Continuous Mode
–6 –8 –11 A
g
m(EA)
Error Amplifi er Transconductance –5µA < I
ITH
< 5µA (Note 4) 200 µS
I
EAO
Error Amplifi er Maximum Output
Current
(Note 4) ±30 µA
t
SS
Internal Soft-Start Time V
FB
from 0.06V to 0.54V,
TRACK/SS = SV
IN
0.65 1.2 1.9 ms
V
TRACK/SS
Enable Internal Soft-Start (Note 7 ) 0.62 V
t
TRACK/SS_DIS
Soft-Start Discharge Time at Start-Up 60 µs
R
ON(TRACK/SS_DIS)
TRACK/SS Pull-Down Resistor at
Start-Up
200 
f
OSC
Oscillator Frequency RT/SYNC = 370k
l
0.8 1 1.2 MHz
Internal Oscillator Frequency V
RT/SYNC
= SV
IN
l
1.8 2.25 2.7 MHz
f
SYNC
Synchronization Frequency Range 0.3 4 MHz
V
RT/SYNC
SYNC Input Threshold High 1.2 V
SYNC Input Threshold Low . 0.3 V
I
SW(LKG)
Switch Leakage Current SV
IN
= PV
IN
= 5.5V, V
RUN
= 0V 0.1 1 µA
V
DDR
DDR Option Enable Voltage SV
IN
– 0.3 V
V
MODE
(Note 9)
Internal Burst Mode Operation 0.3 V
Pulse-Skipping Mode SV
IN
– 0.3 V
Forced Continuous Mode 1.1 SV
IN
• 0.58 V
External Burst Mode Operation 0.45 0.8 V