LTC3703-5_15 Datasheet, PDF (3/32 Pages) Linear Technology – 60V Synchronous Switching Regulator Controller

LTC3703-5
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.
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}
∆V_{FB, LOAD}
V_MODE/SYNC
∆V_MODE/SYNC
I_MODE/SYNC
V_INV
I_INV
I_VIN
I_MAX
V_{OS, IMAX}
V_RUN/SS
I_RUN/SS
V_UV
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
MODE/SYNC Threshold
MODE/SYNC Hysteresis
MODE/SYNC Current
Invert Threshold
Invert Current
V_IN Sense Input Current
I_MAX Source Current
V_IMAX Offset Voltage
Shutdown Threshold
RUN/SS Source Current
Maximum RUN/SS Sink Current
Undervoltage Lockout
5V < V_CC < 15V (Note 4)
1V < V_COMP < 2V (Note 4)
MODE/SYNC Rising
0 ≤ V_MODE/SYNC ≤ 15V
0 ≤ V_INV ≤ 15V
V_IN = 60V
RUN/SS = 0V, V_IN = 10V
V_IMAX = 0V
|V_SW| – V_IMAX at I_RUN/SS = 0µA
RUN/SS = 0V
|V_SW| – V_IMAX > 100mV
V_CC Rising
V_CC Falling
Hysteresis
●
0.007 0.05
%/V
●
0.01
0.1
%
0.75 0.8 0.87
V
20
mV
0
1
µA
1
1.5
2
V
0
1
µA
80
130
µA
0
1
µA
10.5
12 13.5
µA
– 25
10
55
mV
0.7
0.9
1.2
V
2.3
3.8
5.3
µA
9
17
25
µA
● 3.4
3.7
4.1
V
● 2.8
3.1
3.4
V
● 0.45 0.65 0.85
V
Oscillator
f_OSC
f_SYNC
t_{ON, MIN}
DC_MAX
Driver
Oscillator Frequency
External Sync Frequency Range
Minimum On-Time
Maximum Duty Cycle
R_SET = 25kΩ
f < 200kHz
270 300 330
kHz
100
600
kHz
200
ns
89
93
96
%
I_{BG, PEAK}
BG Driver Peak Source Current
R_{BG, SINK}
BG Driver Pull-Down R_{DS, ON}
I_{TG, PEAK}
TG Driver Peak Source Current
R_{TG, SINK}
TG Driver Pull-Down R_{DS, ON}
Feedback Amplifier
(Note 8)
(Note 8)
0.75
1
A
1.2
1.8
Ω
0.75
1
A
1.2
1.8
Ω
A_VOL
f_U
I_FB
I_COMP
Op Amp DC Open Loop Gain
(Note 4)
Op Amp Unity Gain Crossover Frequency (Note 6)
FB Input Current
COMP Sink/Source Current
0 ≤ V_FB ≤ 3V
74
85
dB
25
MHz
0
1
µA
±5
±10
mA
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
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.
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