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| LTC3704 Datasheet, PDF (3/28 Pages) Linear Technology – Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller | |||
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LTC3704
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = VINTVCC = 5V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Oscillator
fOSC
Oscillator Frequency
Oscillator Frequency Range
RFREQ = 80k
250
300
350
50
1000
DMAX
fSYNC/fOSC
Maximum Duty Cycle
Recommended Maximum Synchronized
Frequency Ratio
fOSC = 300kHz (Note 6)
87
92
97
1.25 1.30
tSYNC(MIN) MODE/SYNC Minimum Input Pulse Width
tSYNC(MAX) MODE/SYNC Maximum Input Pulse Width
VIL(MODE) Low Level MODE/SYNC Input Voltage
VIH(MODE) High Level MODE/SYNC Input Voltage
RMODE/SYNC MODE/SYNC Input Pull-Down Resistance
VFREQ
Nominal FREQ Pin Voltage
Low Dropout Regulator
VSYNC = 0V to 5V
VSYNC = 0V to 5V
25
0.8/fOSC
0.3
1.2
50
0.62
VINTVCC
âVINTVCC
âVIN1
âVINTVCC
âVIN2
VLDO(LOAD)
VDROPOUT
IINTVCC
INTVCC Regulator Output Voltage
INTVCC Regulator Line Regulation
INTVCC Regulator Line Regulation
INTVCC Load Regulation
INTVCC Regulator Dropout Voltage
Bootstrap Mode INTVCC Supply
Current in Shutdown
VIN = 7.5V
7.5V ⤠VIN ⤠15V
15V ⤠VIN ⤠30V
0 ⤠IINTVCC ⤠20mA
VIN = 5V, INTVCC Load = 20mA
RUN = 0V, SENSE = 5V
5.0
5.2
5.4
8
25
70
200
â 2 â 0.2
280
10
20
GATE Driver
tr
GATE Driver Output Rise Time
tf
GATE Driver Output Fall Time
CL = 3300pF (Note 7)
CL = 3300pF (Note 7)
17
100
8
100
UNITS
kHz
kHz
%
ns
ns
V
V
kâ¦
V
V
mV
mV
%
mV
µA
ns
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC3704E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the â 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD ⢠120°C/W)
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (QG ⢠fOSC). See Applications Information.
Note 5: The LTC3704 is tested in a feedback loop that servos VNFB to the
reference voltage with the ITH pin forced to a voltage between 0V and 1.4V
(the no load to full load operating voltage range for the ITH pin is 0.3V to
1.23V).
Note 6: In a synchronized application, the internal slope compensation
gain is increased by 25%. Synchronizing to a significantly higher ratio will
reduce the effective amount of slope compensation, which could result in
subharmonic oscillation for duty cycles greater than 50%.
Note 7: Rise and fall times are measured at 10% and 90% levels.
sn3704 3704fs
3
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