Datasheet

LTC3615/LTC3615-1
3
3615fb
For more information www.linear.com/LTC3615
elecTrical characTerisTics
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
l
1.7 V
SV
IN
Ramping Up 2.25 V
V
FB
Feedback Voltage Internal Reference (Note 3) V
TRACK
= SV
IN
, V
SRLIM
= 0V
0°C < T
J
< 85°C
–40°C < T
J
< 125°C
–55°C < T
J
< 150°C
l
l
0.592
0.590
0.588
0.6 0.608
0.610
0.612
V
V
V
Feedback V
oltage External Reference
(Note 7)
(Note 3) V
TRACK
= 0.3V, V
SRLIM
= SV
IN
0.289 0.3 0.311 V
(Note 3) V
TRACK
= 0.5V, V
SRLIM
= SV
IN
0.489 0.5 0.511 V
I
FB
Feedback Input Current V
FBx
= 0.6V
l
0 ±30 nA
∆V
LINEREG
Line Regulation SV
IN
= PV
INx
= 2.25V to 5.5V (Note 4)
l
0.2 %/ V
∆V
LOADREG
Load Regulation V
ITHx
from 0.5V to 0.9V (Note 4)
V
ITHx
= SV
IN
, V
FBx
= 0.6V (Note 5)
0.2
2
%
%
I
S
Active Mode V
FB1
= 0.5V, V
MODE
= SV
IN
, V
RUN2
= 0V (Note 6) 1100 µA
V
FBx
= 0.5V, V
MODE
= SV
IN
, V
RUNx
= SV
IN
(Note
6)
1900 µA
Sleep Mode V
FB1
= 0.7V, V
RUN1
= SV
IN
, V
RUN2
= 0V,
V
MODE
= 0V, V
ITH1
= SV
IN
(Note 5)
95 130 µA
V
FBx
= 0.7V, V
RUN1
= SV
IN
, V
RUN2
= 0V,
V
MODE
= 0V (Note 4)
145 220 µA
V
FBx
= 0.7V, V
RUNx
= SV
IN
, V
MODE
=0V,
V
ITHx
= SV
IN
(Note 5)
130 200 µA
V
FBx
= 0.7V, V
RUNx
= SV
IN
, V
MODE
=0V,
I
TH
= (Note 4)
240 360 µA
Shutdown SV
IN
= PV
IN
= 5.5V, V
RUNx
= 0V 0.1 1 µA
R
DS(ON)
Top Switch On-Resistance PV
INx
= 3.3V (Note 10) 75 mΩ
Bottom Switch On-Resistance PV
INx
= 3.3V (Note 10) 55 mΩ
I
LIM
Top Switch Current Limit Sourcing (Note 8), V
FB
= 0.5V
Duty Cycle <35%
Duty Cycle = 100%
4.5
3.6
6 7.5 A
A
Bottom Switch Current Limit
Sinking (Note 8), V
FB
= 0.7V,
Forced Continuous Mode
–2.5 –3.5 –5 A
I
SW(LKG)
Switch Leakage Current SV
IN
= PV
IN
= 5.5V, V
RUNx
= 0V 0.01 1 µA
g
m(EA)
Error Amplifier Transconductance –5µA < I
TH
< 5µA 240 µmho
I
EA
Error Amplifier Output Current (Note 4) ±30 µA
t
SOFT-START
Internal Soft-Start Time V
FBx
from 0.06V to 0.54V, TRACK/SSx = SV
IN
0.65 1.1 1.7 ms
R
DIS
TRACK/SS Pull-Down Resistance at
Start-Up
200 Ω
t
DIS
Soft-Start Discharge Time at Start-Up 70 µs
f
OSC
Internal Oscillator Frequency R
RT/SYNC
= 178k
l
1.85 2.25 2.65 MHz
V
RT/SYNC
= SV
IN
l
1.8 2.25 2.7 MHz
f
SYNC
Synchronization Frequency t
LOW
, t
HIGH
> 30ns 0.4 4 MHz
V
RT/SYNC
SYNC Level High 1.2 V
SYNC Level Low 0.3 V
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2), SV
IN
= PV
INx
= 3.3V, R
T
= 178k, R
SRLIM
= 40.2k, unless
otherwise specified.
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