參數(shù)資料
型號(hào): LTC1704B
廠商: Linear Technology Corporation
元件分類(lèi): 通用總線功能
英文描述: Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
中文描述: 550kHz的同步開(kāi)關(guān)穩(wěn)壓器控制器加線性穩(wěn)壓控制器
文件頁(yè)數(shù): 3/28頁(yè)
文件大?。?/td> 343K
代理商: LTC1704B
LTC1704/LTC1704B
3
1704bfa
ELECTRICAL CHARACTERISTICS
The
G
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
Switcher Switching Characteristics
f
OSC
Oscillator Frequency
DC
MAX
Maximum Duty Cycle
t
NOV
Driver Nonoverlap
t
r
, t
f
Driver Rise/Fall Time
Linear Regulator Controller
V
REGFB
Feedback Voltage
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Test Circuit
G
460
87
10
550
90
25
15
650
93
120
100
kHz
%
ns
ns
G
Test Circuit (Note 8)
Test Circuit (Note 8)
G
G
Test Circuit, R
REGILM
= 680k
0.784
0.780
0.800
0.800
0.816
0.820
±
1
±
0.2
V
V
G
I
REGFB
dV
REGFB
REGFB Input Current
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Driver Output Current
G
μ
A
Test Circuit, V
CC
= 4.5V to 5.5V
Test Circuit, I
REGDR
= 0mA to 30mA
Test Circuit
R
REGILM
= 680k, V
REGFB
= 0.76V, V
REGDR
= 3.3V
R
REGILM
= 680k, V
REGFB
= 0V, V
REGDR
= 1V
Test Circuit, I
REGDR
= 30mA, V
REGDR
= 3.3V,
dV
REGFB
= –1% (Note 9)
Test Circuit, R
REGILM
= 680k
V
REGILM
= 0V
G
±
0.05
–0.05
%/V
G
–0.2
30
%
I
REGDR
G
mA
mA
mA
20
6
0.65
V
DROPOUT
Driver Dropout Voltage
G
1.1
V
V
REGILM
I
REGILMINT
V
PGOOD
REGILM Threshold
REGILM Internal Pull-Up Current
Negative REGFB Power Good Threshold
Positive REGFB Power Good Threshold
0.8
–1.9
–10
10
V
μ
A
%
%
G
–15
6
–6
15
G
PGOOD
I
PGOOD
V
PGOOD
Sink Current
Power Good
Power Bad
I
PGOOD
= 1mA
(Note 8)
(Note 8)
G
G
10
μ
A
mA
10
V
OLPG
t
PGOOD
V
PGOOD
Output Low Voltage
V
PGOOD
Falling Edge Delay
V
PGOOD
Rising Edge Delay
G
0.03
1
20
0.1
4
40
V
G
0.5
10
μ
s
μ
s
G
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