LTC1704/LTC1704B
3
1704bfa
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= PV
CC
= BOOST = 5V, unless otherwise specified. (Note 3)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1704E 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.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: PV
CC
and BV
CC
(V
BOOST
– V
SW
) must be greater than V
GS(ON)
of
the external MOSFETs to ensure proper operation.
Note 5: Supply current in normal operation is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
will vary with supply voltage and the external MOSFETs used.
Note 6: Supply current in shutdown is dominated by external MOSFET
leakage and may be significantly higher than the quiescent current drawn
by the LTC1704, especially at elevated temperature.
Note 7: Guaranteed by design, not subject to test.
Note 8: Rise and fall times are measured using 10% and 90% levels. Delay
and nonoverlap times are measured using 50% levels.
Note 9: Dropout voltage is the minimum V
CC
to V
REGDR
voltage differential
required to maintain regulation at the specified driver output current.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switcher Switching Characteristics
f
OSC
Oscillator Frequency Test Circuit ● 460 550 650 kHz
DC
MAX
Maximum Duty Cycle ● 87 90 93 %
t
NOV
Driver Nonoverlap Test Circuit (Note 8) ● 10 25 120 ns
t
r
, t
f
Driver Rise/Fall Time Test Circuit (Note 8) ● 15 100 ns
Linear Regulator Controller
V
REGFB
Feedback Voltage Test Circuit, R
REGILM
= 680k 0.784 0.800 0.816 V
● 0.780 0.800 0.820 V
I
REGFB
REGFB Input Current ● ±1 µA
dV
REGFB
Feedback Voltage Line Regulation Test Circuit, V
CC
= 4.5V to 5.5V ● ±0.05 ±0.2 %/V
Feedback Voltage Load Regulation Test Circuit, I
REGDR
= 0mA to 30mA ● –0.2 –0.05 %
I
REGDR
Driver Output Current Test Circuit ● 30 mA
R
REGILM
= 680k, V
REGFB
= 0.76V, V
REGDR
= 3.3V 20 mA
R
REGILM
= 680k, V
REGFB
= 0V, V
REGDR
= 1V 6 mA
V
DROPOUT
Driver Dropout Voltage Test Circuit, I
REGDR
= 30mA, V
REGDR
= 3.3V, ● 0.65 1.1 V
dV
REGFB
= –1% (Note 9)
V
REGILM
REGILM Threshold Test Circuit, R
REGILM
= 680k 0.8 V
I
REGILMINT
REGILM Internal Pull-Up Current V
REGILM
= 0V –1.9 µA
V
PGOOD
Negative REGFB Power Good Threshold ● –15 –10 –6 %
Positive REGFB Power Good Threshold ● 61015 %
PGOOD
I
PGOOD
V
PGOOD
Sink Current Power Good ● 10 µA
Power Bad
● 10 mA
V
OLPG
V
PGOOD
Output Low Voltage I
PGOOD
= 1mA ● 0.03 0.1 V
t
PGOOD
V
PGOOD
Falling Edge Delay (Note 8) ● 0.5 1 4 µs
V
PGOOD
Rising Edge Delay (Note 8) ● 10 20 40 µs
