ltc3612 Linear Technology Corporation, ltc3612 Datasheet - Page 3

• Manufacturer Part Number: ltc3612
• Description: 3a, 4mhz Monolithic Synchronous Step-down Dc/dc Converter
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
V
V
V
I
ΔV
ΔV
I
R
I
g
I
t
V
t
R
f
f
V
I
V
V
(Note 9)
FB
S
LIM
EAO
SS
TRACK/SS_DIS
OSC
SYNC
SW(LKG)
m(EA)
TRACK/SS
IN
UVLO
FB
RT/SYNC
DDR
MODE
DS(ON)
ON(TRACK/SS_DIS)
LINEREG
LOADREG
PARAMETER
Operating Voltage Range
Undervoltage Lockout Threshold
Feedback Voltage Internal Reference
Feedback Voltage External Reference
(Note 7)
Feedback Input Current
Line Regulation
Load Regulation
Active Mode
Sleep Mode
Shutdown
Top Switch On-Resistance
Bottom Switch On-Resistance
Top Switch Current Limit
Bottom Switch Current Limit
Error Amplifi er Transconductance
Error Amplifi er Maximum Output
Current
Internal Soft-Start Time
Enable Internal Soft-Start
Soft-Start Discharge Time at Start-Up
TRACK/SS Pull-Down Resistor at
Start-Up
Oscillator Frequency
Internal Oscillator Frequency
Synchronization Frequency
SYNC Level High
SYNC Level Low
Switch Leakage Current
DDR Option Enable Voltage
Internal Burst Mode Operation
Pulse-Skipping Mode
Forced Continuous Mode
External Burst Mode Operation
A
CONDITIONS
SV
SV
(Note 3) V
0°C < T
–40°C < T
(Note 3) V
(Note 3) V
V
SV
(Notes 3, 4) TRACK/SS = SV
ITH from 0.5V to 0.9V (Notes 3, 4)
V
V
V
(Note 5)
V
SV
PV
PV
Sourcing (Note 8), V
Duty Cycle <35%
Duty Cycle = 100%
Sinking (Note 8), V
Forced Continuous Mode
–5μA < I
(Note 4)
V
TRACK/SS = SV
(Note 7 )
RT/SYNC = 370k
V
SV
= 25°C. V
FB
ITH
FB
FB
FB
FB
RT/SYNC
IN
IN
IN
IN
IN
IN
IN
= 0.6V
= 0.5V, V
= 0.7V, V
= 0.7V, V
from 0.06V to 0.54V,
= SV
Ramping Down
Ramping Up
= PV
= PV
= 3.3V (Note 10)
= 3.3V (Note 10)
= PV
The
J
ITH
< 85°C
= SV
IN
IN
IN
IN
J
TRACK
TRACK
TRACK
l
< 125°C
< 5μA (Note 4)
IN
(Note 5)
= 2.25V to 5.5V
= 5.5V, V
= 5.5V, V
MODE
MODE
MODE
denotes the specifi cations which apply over the full operating junction
IN
= 3.3V, RT/SYNC = SV
IN
= SV
= 0.3V, V
= 0.5V, V
= SV
= 0V, ITH = SV
= 0V (Note 4)
FB
FB
RUN
RUN
IN
= 0.7V,
, V
IN
= 0.5V
DDR
DDR
= 0V
= 0V
DDR
(Note 6)
IN
= SV
= SV
= 0V
IN
IN
IN
IN
l
l
l
l
l
l
l
l
unless otherwise specifi ed (Notes 1, 2, 11).
SV
SV
0.594
0.591
0.289
0.489
IN
IN
MIN
2.25
0.65
0.62
0.45
1.7
5.2
0.8
1.8
0.3
1.2
1.1
–3
70
4
.
– 0.3
– 0.3
1100
2.25
TYP
120
200
±30
0.6
0.3
0.5
0.1
0.1
70
70
45
–4
6
1
1
LTC3612
SV
0.606
0.609
0.311
0.511
IN
MAX
2.25
0.25
±30
100
160
200
5.5
0.2
2.6
6.8
1.5
1.2
2.7
0.3
0.3
0.8
–5
1
4
1
• 0.58
UNITS
3
MHz
MHz
MHz
3612f
%/V
mΩ
mΩ
ms
nA
μA
μA
μA
μA
μS
μA
μA
μs
%
%
Ω
V
V
V
V
V
V
V
A
A
A
V
V
V
V
V
V
V
V