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LTC3616 Datasheet, PDF (3/28 Pages) Linear Technology – 6A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter
LTC3616
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at TJ = 25°C. VIN = 3.3V, RT/SYNC = SVIN unless otherwise specified (Notes 1, 2, 11).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN
Operating Voltage Range
l 2.25
5.5
V
VUVLO
Undervoltage Lockout Threshold
SVIN Ramping Down
SVIN Ramping Up
l 1.7
l
V
2.25
V
VFB
Feedback Voltage Internal Reference (Note 3) VTRACK = SVIN, VDDR = 0V
0°C < TJ < 85°C
0.594
0.6
0.606
V
–40°C < TJ < 125°C
l 0.591
0.609
V
Feedback Voltage External Reference
(Note 7)
(Note 3) VTRACK = 0.3V, VDDR = SVIN
(Note 3) VTRACK = 0.5V, VDDR = SVIN
0.275
0.300
0.325
V
0.475
0.500
0.525
V
IFB
Feedback Input Current
VFB = 0.6V
l
±30
nA
ΔVLINEREG
Line Regulation
SVIN = PVIN = 2.25V to 5.5V
l
(Notes 3, 4) TRACK/SS = SVIN
0.2
%/V
ΔVLOADREG
Load Regulation
ITH from 0.5V to 0.9V (Notes 3, 4)
VITH = SVIN (Note 5)
0.25
%
2.6
%
IS
Active Mode
VFB = 0.5V, VMODE = SVIN (Note 6)
1100
μA
Sleep Mode
VFB = 0.7V, VMODE = 0V, ITH = SVIN
(Note 5)
75
100
μA
RDS(ON)
ILIM
Shutdown
Top Switch On-Resistance
Bottom Switch On-Resistance
Top Switch Current Limit
VFB = 0.7V, VMODE = 0V (Note 4)
SVIN = PVIN = 5.5V, VRUN = 0V
PVIN = 3.3V (Note 10)
PVIN = 3.3V (Note 10)
Sourcing (Note 8), VFB = 0.5V
Duty Cycle <35%
Duty Cycle = 100%
130
175
μA
0.1
1
μA
35
mΩ
25
mΩ
10.5
12
13.5
A
8
A
Bottom Switch Current Limit
Sinking (Note 8), VFB = 0.7V,
Forced Continuous Mode
–6
–8
–11
A
gm(EA)
IEAO
Error Amplifier Transconductance
Error Amplifier Maximum Output
Current
–5μA < IITH < 5μA (Note 4)
(Note 4)
200
μS
±30
μA
tSS
Internal Soft-Start Time
VTRACK/SS
Enable Internal Soft-Start
tTRACK/SS_DIS
Soft-Start Discharge Time at Start-Up
RON(TRACK/SS_DIS) TRACK/SS Pull-Down Resistor at
Start-Up
VFB from 0.06V to 0.54V,
TRACK/SS = SVIN
(Note 7 )
0.65
1.2
1.9
ms
0.62
V
60
μs
200
Ω
fOSC
fSYNC
VRT/SYNC
Oscillator Frequency
Internal Oscillator Frequency
Synchronization Frequency Range
SYNC Level High
SYNC Level Low
RT/SYNC = 370k
VRT/SYNC = SVIN
l 0.8
1
1.2
MHz
l 1.8
2.25
2.7
MHz
0.3
4
MHz
1.2
V
.
0.3
V
ISW(LKG)
VDDR
VMODE
(Note 9)
Switch Leakage Current
DDR Option Enable Voltage
Internal Burst Mode Operation
Pulse-Skipping Mode
Forced Continuous Mode
External Burst Mode Operation
SVIN = PVIN = 5.5V, VRUN = 0V
0.1
1
μA
SVIN – 0.3
V
0.3
V
SVIN – 0.3
1.1
0.45
V
SVIN • 0.58
V
0.8
V
3616f
3