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LTC1704 データシート(PDF) 3 Page - Linear Technology

部品番号 LTC1704
部品情報  550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LTC1704 データシート(HTML) 3 Page - Linear Technology

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LTC1704/LTC1704B
3
1704bfa
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = PVCC = 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: PVCC and BVCC (VBOOST – VSW) must be greater than VGS(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 VCC to VREGDR voltage differential
required to maintain regulation at the specified driver output current.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Switcher Switching Characteristics
fOSC
Oscillator Frequency
Test Circuit
q
460
550
650
kHz
DCMAX
Maximum Duty Cycle
q
87
90
93
%
tNOV
Driver Nonoverlap
Test Circuit (Note 8)
q
10
25
120
ns
tr, tf
Driver Rise/Fall Time
Test Circuit (Note 8)
q
15
100
ns
Linear Regulator Controller
VREGFB
Feedback Voltage
Test Circuit, RREGILM = 680k
0.784
0.800
0.816
V
q
0.780
0.800
0.820
V
IREGFB
REGFB Input Current
q
±1
µA
dVREGFB
Feedback Voltage Line Regulation
Test Circuit, VCC = 4.5V to 5.5V
q
±0.05
±0.2
%/V
Feedback Voltage Load Regulation
Test Circuit, IREGDR = 0mA to 30mA
q
–0.2
–0.05
%
IREGDR
Driver Output Current
Test Circuit
q
30
mA
RREGILM = 680k, VREGFB = 0.76V, VREGDR = 3.3V
20
mA
RREGILM = 680k, VREGFB = 0V, VREGDR = 1V
6
mA
VDROPOUT
Driver Dropout Voltage
Test Circuit, IREGDR = 30mA, VREGDR = 3.3V,
q
0.65
1.1
V
dVREGFB = –1% (Note 9)
VREGILM
REGILM Threshold
Test Circuit, RREGILM = 680k
0.8
V
IREGILMINT
REGILM Internal Pull-Up Current
VREGILM = 0V
–1.9
µA
VPGOOD
Negative REGFB Power Good Threshold
q
–15
–10
–6
%
Positive REGFB Power Good Threshold
q
610
15
%
PGOOD
IPGOOD
VPGOOD Sink Current
Power Good
q
10
µA
Power Bad
q
10
mA
VOLPG
VPGOOD Output Low Voltage
IPGOOD = 1mA
q
0.03
0.1
V
tPGOOD
VPGOOD Falling Edge Delay
(Note 8)
q
0.5
1
4
µs
VPGOOD Rising Edge Delay
(Note 8)
q
10
20
40
µs


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