LTC3607
elecTrical characTerisTics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
4.5
4.5
0.6
TYP
MAX
15
UNITS
l
l
SV
PV
Operating Voltage Range
Operating Voltage Range
Output Voltage Range
Feedback Voltage (Note 3)
V
V
V
IN
IN
15
V
V
PV
IN
OUT
FB
0.591
0.588
0.6
0.6
0.609
0.612
V
V
l
I
Feedback Pin Input Current
30
nA
%/V
%
FB
ΔV
ΔV
Reference Voltage Line Regulation
Output Voltage Load Regulation
V
= 4.5V to 15V (Note 3)
IN
0.1
0.5
0.15
LINE REG
MODE/SYNC = 0V (Note 3)
LOAD REG
I
Input DC Supply Current
Active Mode
(Note 4)
S
3.2
55
V
V
V
= V
= V
= 0.5V
mA
µA
µA
µA
FB1
FB1
FB(1 or 2)
FB2
FB2
90
60
1
Sleep Mode (Both Channels)
Sleep Mode (Single Channel)
Shutdown
= 0.64V
35
= 0.64V
0.1
RUN1 = RUN2 = 0V
l
f
f
I
Oscillator Frequency
V
V
= 0.6V
1.8
1.0
2.25
2.7
4.0
MHz
MHz
A
OSC
SYNC
LIM
FB1, 2
Synchronization Frequency
Peak Switch Current Limit
= 0.5V, Duty Cycle < 35%
0.75
1
1.25
FB1, 2
R
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.6
0.25
Ω
Ω
DS(ON)
UVLO
SV Undervoltage Lockout Threshold
SV Rising
3.4
4.3
11
V
IN
IN
PGOOD
PGOOD1/2 Overvoltage Threshold
PGOOD1/2 Undervoltage Threshold
PGOOD1/2 On-Resistance
V
V
Rising
Hysteresis
8.5
–3
%
%
FB1, 2
FB1, 2
V
V
Ramping Down
Hysteresis
–11
–8.5
3
%
%
FB1, 2
FB1, 2
Channel 1 or Channel 2 Active
RUN1 = RUN2 = 0V
70
700
Ω
Ω
t
I
Power Good Blanking Time
PGOOD Leakage
64
Cycles
µA
PGOOD
1
PGOOD
l
l
V
RUN1/2 V
RUN1/2 V
0.55
0.3
V
V
RUN
IL
IH
3.0
1
l
I
RUN1/2 Leakage Current
0.01
0.35
µA
RUN
l
l
V
MODE/SYNC V
MODE/SYNC V
V
V
MODE/SYNC
IL
IH
1.0
t
Internal Soft-Start Time
V
from 10% to 90% Full Scale
ms
SOFTSTART
FB
PV = PV = SV = 4.5V
IN1
IN2
IN
Note 1. Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
specific operating conditions in conjunction with board layout, the rated
package thermal resistance and other environmental factors.
Note 3. The LTC3607 is tested in a proprietary test mode that connects
V
to the output of the error amplifier to an external servo loop.
FB
Note 2. The LTC3607 is tested under pulsed load conditions such that
Note 4. Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
T ≈ T . The LTC3607E is guaranteed to meet specifications from
J
A
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3607I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 5. T is calculated from the ambient T and power dissipation P
D
J
A
according to the following formula: T = T + (PD • θ ).
J
A
JA
Note 6. The QFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
Note 7. This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
The junction temperature (T ) is calculated from the ambient temperature
J
(T ) and power dissipation (P ) according to the formula:
A
D
T = T + (P • θ °C/W)
J
A
D
JA
where θ is the package thermal impedance. Note that the maximum
JA
ambient temperature is consistent with these specifications determined by
3607fb
For more information www.linear.com/LTC3607
3
Linear Systems [ Linear Systems ]
