LTC1628CG-SYNC Ver la hoja de datos (PDF) - Linear Technology
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LTC1628CG-SYNC Datasheet PDF : 32 Pages
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LTC1628-SYNC
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1628-SYNC: TJ = TA + (PD • 95 °C/W)
Note 3: The LTC1628-SYNC is tested in a feedback loop that servos VITH1,
2 to a specified voltage and measures the resultant
VOSENSE1, 2.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 6: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time
considerations in the Applications Information section).
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
and Mode (Figure 14)
100
Burst Mode
90 OPERATION
80
70
FORCED
60
CONTINUOUS
50
MODE
40
CONSTANT
30
FREQUENCY
(BURST DISABLE)
20
10
0
0.001
VIN = 15V
VOUT = 5V
0.01
0.1
1
10
OUTPUT CURRENT (A)
1628 G01
Supply Current vs Input Voltage
and Mode (Figure 14)
1000
800
600
BOTH
CONTROLLERS ON
400
200
0
0
STANDBY
SHUTDOWN
5 10 15 20 25
INPUT VOLTAGE (V)
30 35
1628 G04
Efficiency vs Output Current
(Figure 14)
100
VIN = 7V
90
VIN = 10V
80
VIN = 15V
VIN = 20V
70
60
50
0.001
VOUT = 5V
0.01
0.1
1
10
OUTPUT CURRENT (A)
1628 G02
EXTVCC Voltage Drop
250
200
150
100
50
0
0
10
20
30
40
50
CURRENT (mA)
1628 G05
Efficiency vs Input Voltage
(Figure 14)
100
VOUT = 5V
IOUT = 3A
90
80
70
60
50
5
15
25
INPUT VOLTAGE (V)
35
1628 G03
INTVCC and EXTVCC Switch
Voltage vs Temperature
5.05
INTVCC VOLTAGE
5.00
4.95
4.90
4.85
4.80
EXTVCC SWITCHOVER THRESHOLD
4.75
4.70
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1628 G06
4
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