LTC1704 Linear Technology, LTC1704 Datasheet - Page 3

• Manufacturer Part Number: LTC1704
• Description: 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller
• Manufacturer: Linear Technology

The
V
SYMBOL
Switcher Switching Characteristics
f
DC
t
t
Linear Regulator Controller
V
I
dV
I
V
V
I
V
PGOOD
I
V
t
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
the external MOSFETs to ensure proper operation.
ELECTRICAL CHARACTERISTICS
OSC
NOV
r
REGFB
REGDR
REGILMINT
PGOOD
PGOOD
, t
REGFB
DROPOUT
REGILM
PGOOD
OLPG
CC
REGFB
MAX
f
= PV
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
CC
CC
= BOOST = 5V, unless otherwise specified. (Note 3)
PARAMETER
Oscillator Frequency
Maximum Duty Cycle
Driver Nonoverlap
Driver Rise/Fall Time
Feedback Voltage
REGFB Input Current
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Driver Output Current
Driver Dropout Voltage
REGILM Threshold
REGILM Internal Pull-Up Current
Negative REGFB Power Good Threshold
Positive REGFB Power Good Threshold
V
V
V
V
and BV
PGOOD
PGOOD
PGOOD
PGOOD
CC
Sink Current
Output Low Voltage
Falling Edge Delay
Rising Edge Delay
(V
BOOST
– V
SW
) must be greater than V
CONDITIONS
Test Circuit
Test Circuit (Note 8)
Test Circuit (Note 8)
Test Circuit, R
Test Circuit, V
Test Circuit, I
Test Circuit
R
R
Test Circuit, I
dV
Test Circuit, R
V
Power Good
Power Bad
I
(Note 8)
(Note 8)
PGOOD
REGILM
REGILM
REGILM
REGFB
GS(ON)
= 1mA
= 680k, V
= 680k, V
= –1% (Note 9)
= 0V
of
REGDR
REGDR
CC
REGILM
REGILM
= 4.5V to 5.5V
REGFB
REGFB
= 0mA to 30mA
= 30mA, V
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
required to maintain regulation at the specified driver output current.
= 680k
= 680k
= 0.76V, V
= 0V, V
REGDR
REGDR
REGDR
= 3.3V,
= 1V
= 3.3V
LTC1704/LTC1704B
0.784
0.780
–0.2
MIN
460
–15
0.5
87
10
30
10
10
6
CC
to V
–0.05
0.800
0.800
0.65
–1.9
0.03
TYP
550
–10
0.05
0.8
90
25
15
20
10
20
6
1
REGDR
voltage differential
0.816
0.820
MAX
650
120
100
1.1
0.1
A
–6
93
15
10
40
0.2
4
1
= 25 C.
UNITS
1704bfa
3
%/V
kHz
mA
mA
mA
mA
ns
ns
%
%
%
%
V
V
A
V
V
A
A
V
s
s