Datasheet

LTC3616
3
3616fc
For more information www.linear.com/LTC3616
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C (Note 2). V
IN
= 3.3V, RT/SYNC = SV
IN
unless otherwise specified.
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
–55°C < T
J
< 150°C
l
l
0.594
0.591
0.589
0.6 0.606
0.609
0.609
V
V
V
Feedback V
oltage External Reference
(Note 7)
(Note 3) V
TRACK
= 0.3V, V
DDR
= SV
IN
0.275 0.300 0.325 V
(Note 3) V
TRACK
= 0.5V, V
DDR
= SV
IN
0.475 0.500 0.525 V
I
FB
Feedback Input Current V
FB
= 0.6V
l
±30 nA
∆V
LINEREG
Line Regulation SV
IN
= PV
IN
= 2.25V to 5.5V
(Notes 3, 4) TRACK/SS = SV
IN
–40°C < T
J
< 125°C
–55°C < T
J
< 150°C
l
l
0.2
0.3
%/V
%/V
∆V
LOADREG
Load Regulation ITH from 0.5V to 0.9V (Notes 3, 4)
V
ITH
= SV
IN
(Note 5)
0.25
2.6
%
%
I
S
Active Mode V
FB
= 0.5V, V
MODE
= SV
IN
(Note 6) 1100 µA
Sleep Mode 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 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 mΩ
Bottom Switch On-Resistance PV
IN
= 3.3V (Note 10) 25 mΩ
I
LIM
Top Switch Current Limit Sourcing (Note 8), V
FB
= 0.5V
Duty Cycle <35%
Duty Cycle = 100%
10.5
7.6
12 13.5 A
A
Bottom Switch Current Limit
Sinking (Note 8), V
FB
= 0.7V,
Forced Continuous Mode
–6 –8 –11 A
g
m(EA)
Error Amplifier Transconductance –5µA < I
ITH
< 5µA (Note 4) 200 µS
I
EAO
Error Amplifier 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 Ω
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 Level High 1.2 V
SYNC Level 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