Datasheet

LTC3703-5
3
37035fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3703-5 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3703I-5 is guaranteed over the full
–40°C to 125°C operating junction temperature range.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3703-5: T
J
= T
A
+ (P
D
• 100 °C/W) G Package
Note 4: The LTC3703-5 is tested in a feedback loop that servos V
FB
to the
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= DRV
CC
= V
BOOST
= V
IN
= 5V, V
MODE/SYNC
= V
INV
= V
SW
=
BGRTN = 0V, RUN/SS = I
MAX
= open, R
SET
= 25k, unless otherwise specified.
reference voltage with the COMP pin forced to a voltage between 1V and 2V.
Note 5: The dynamic input supply current is higher due to the power
MOSFET gate charging being delivered at the switching frequency
(Q
G
• f
OSC
).
Note 6: Guaranteed by design. Not subject to test.
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.
Note 8: R
DS(ON)
guaranteed by correlation to wafer level measurement.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
FB
Feedback Voltage (Note 4) 0.792 0.800 0.808 V
● 0.788 0.812 V
∆V
FB, LINE
Feedback Voltage Line Regulation 5V < V
CC
< 15V (Note 4) ● 0.007 0.05 %/V
∆V
FB, LOAD
Feedback Voltage Load Regulation 1V < V
COMP
< 2V (Note 4) ● 0.01 0.1 %
V
MODE/SYNC
MODE/SYNC Threshold MODE/SYNC Rising 0.75 0.8 0.87 V
∆V
MODE/SYNC
MODE/SYNC Hysteresis 20 mV
I
MODE/SYNC
MODE/SYNC Current 0 ≤ V
MODE/SYNC
≤ 15V 0 1 µA
V
INV
Invert Threshold 1 1.5 2 V
I
INV
Invert Current 0 ≤ V
INV
≤ 15V 0 1 µA
I
VIN
V
IN
Sense Input Current V
IN
= 60V 80 130 µA
RUN/SS = 0V, V
IN
= 10V 0 1 µA
I
MAX
I
MAX
Source Current V
IMAX
= 0V 10.5 12 13.5 µA
V
OS, IMAX
V
IMAX
Offset Voltage |V
SW
| – V
IMAX
at I
RUN/SS
= 0µA – 25 10 55 mV
V
RUN/SS
Shutdown Threshold 0.7 0.9 1.2 V
I
RUN/SS
RUN/SS Source Current RUN/SS = 0V 2.3 3.8 5.3 µA
Maximum RUN/SS Sink Current |V
SW
| – V
IMAX
> 100mV 9 17 25 µA
V
UV
Undervoltage Lockout V
CC
Rising ● 3.4 3.7 4.1 V
V
CC
Falling ● 2.8 3.1 3.4 V
Hysteresis
● 0.45 0.65 0.85 V
Oscillator
f
OSC
Oscillator Frequency R
SET
= 25kΩ 270 300 330 kHz
f
SYNC
External Sync Frequency Range 100 600 kHz
t
ON, MIN
Minimum On-Time 200 ns
DC
MAX
Maximum Duty Cycle f < 200kHz 89 93 96 %
Driver
I
BG, PEAK
BG Driver Peak Source Current 0.75 1 A
R
BG, SINK
BG Driver Pull-Down R
DS, ON
(Note 8) 1.2 1.8 Ω
I
TG, PEAK
TG Driver Peak Source Current 0.75 1 A
R
TG, SINK
TG Driver Pull-Down R
DS, ON
(Note 8) 1.2 1.8 Ω
Feedback Amplifier
A
VOL
Op Amp DC Open Loop Gain (Note 4) 74 85 dB
f
U
Op Amp Unity Gain Crossover Frequency (Note 6) 25 MHz
I
FB
FB Input Current 0 ≤ V
FB
≤ 3V 0 1 µA
I
COMP
COMP Sink/Source Current ±5 ±10 mA