LTC3615 LINER [Linear Technology], LTC3615 Datasheet - Page 3

• Manufacturer Part Number: LTC3615
• Description: Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

elecTrical characTerisTics
junction temperature range, otherwise specifications are at T
otherwise specified (Notes 1, 2, 11).
SYMBOL
V
V
V
I
∆V
∆V
I
R
I
I
g
I
t
R
t
f
f
V
FB
S
LIM
SW(LKG)
EAO
SOFT-START
TRACK/SS_DIS
OSC
SYNC
m(EA)
IN
UVLO
FB
ON(TRACK/SS_DIS)
RT/SYNC
DS(ON)
LINEREG
LOADREG
PARAMETER
Active Mode
Sleep Mode
Shutdown
Bottom Switch Current Limit
Internal Oscillator Frequency
Operating Voltage Range
Undervoltage Lockout Threshold
Feedback Voltage Internal Reference
Feedback Voltage External Reference
(Note 7)
Feedback Input Current
Line Regulation
Load Regulation
Top Switch On-Resistance
Bottom Switch On-Resistance
Top Switch Current Limit
Switch Leakage Current
Error Amplifier Transconductance
Error Amplifier Output Current
Internal Soft-Start Time
TRACK/SS Pull-Down Resistance at
Start-Up
Soft-Start Discharge Time at Start-Up
Synchronization Frequency
SYNC Level High
SYNC Level Low
CONDITIONS
SV
SV
V
V
t
(Note 3) V
0°C < T
–40°C < T
(Note 3) V
(Note 3) V
V
SV
V
V
V
V
V
V
V
V
V
I
SV
PV
PV
Sourcing (Note 8), V
Duty Cycle <35%
Duty Cycle = 100%
Sinking (Note 8), V
Forced Continuous Mode
SV
–5µA < I
(Note 4)
V
R
V
LOW
TH
FB1
MODE
FBx
FBx
ITHx
ITHx
FB1
FBx
MODE
FBx
ITHx
FBx
FBx
RT/SYNC
RT/SYNC
IN
IN
IN
IN
INx
INx
IN
= (Note 4)
, t
= 0.5V, V
= 0.7V, V
Ramping Down
Ramping Up
= 0.6V
= 0.7V, V
= 0.7V, V
= 0.7V, V
from 0.06V to 0.54V, TRACK/SSx = SV
= PV
= 0.5V, V
= PV
= PV
from 0.5V to 0.9V (Note 4)
= SV
= SV
= 3.3V (Note 10)
= 3.3V (Note 10)
HIGH
= 0V, V
= 0V (Note 4)
J
TH
< 85°C
= SV
The
= 178k
INx
IN
IN
TRACK
J
TRACK
TRACK
IN
IN
< 5µA
> 30ns
< 125°C
A
= 5.5V, V
= 5.5V, V
, V
(Note 5)
= 2.25V to 5.5V (Note 4)
MODE
RUN1
= 25°C (Note 2), SV
ITH1
RUN1
RUNx
RUNx
MODE
IN
l
FBx
= SV
= 0.3V, V
= 0.5V, V
denotes the specifications which apply over the full operating
= SV
= 0.6V (Note 5)
= SV
= SV
= SV
= SV
FB
= SV
= SV
FB
RUNx
RUNx
IN
= 0.7V,
IN
, V
= 0.5V
IN
IN
IN
IN
IN
IN
SRLIM
SRLIM
(Note 5)
, V
, V
SRLIM
, V
, V
, V
, V
= 0V
= 0V
RUNx
RUN2
MODE
MODE
RUN2
RUN2
= SV
= SV
= 0V
= SV
= 0V,
= 0V,
=0V,
=0V,
= 0V (Note 6)
IN
IN
IN
IN
= PV
(Note 6)
IN
INx
= 3.3V, R
l
l
l
l
l
l
l
T
0.592
0.590
0.289
0.489
2.25
–2.5
0.65
1.85
MIN
1.7
4.5
3.6
1.8
0.4
1.2
70
= 178k, R
1100
1900
–3.5
0.01
2.25
2.25
TYP
145
130
240
240
±30
0.6
0.3
0.5
0.1
1.1
95
75
55
0
6
SRLIM
LTC3615
= 40.2k, unless
0.608
0.610
0.311
0.511
MAX
2.25
2.65
±30
130
220
200
360
200
5.5
0.2
0.2
7.5
1.7
2.7
0.3
–5
2
1
1
4
UNITS
µmho

%/ V
MHz
MHz
MHz
3615f
mΩ
mΩ
ms
nA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µs
%
%
Ω
V
V
V
V
V
V
V
A
A
A
V
V