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LTC1628 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC1628
Description  High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1628 Datasheet(HTML) 4 Page - Linear Technology

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LTC1628/LTC1628-PG
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/LTC1628-PG: TJ = TA + (PD • 95 °C/W)
Note 3: The LTC1628/LTC1628-PG are 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).
Note 7: VFREQSET pin internally tied to 1.19V reference through a large
resistance.
Efficiency vs Output Current
and Mode (Figure 13)
OUTPUT CURRENT (A)
0.001
0
10
30
40
50
100
70
0.01
0.1
1
1628 G01
20
80
90
60
10
FORCED
CONTINUOUS
MODE
CONSTANT
FREQUENCY
(BURST DISABLE)
Burst Mode
OPERATION
VIN = 15V
VOUT = 5V
OUTPUT CURRENT (A)
0.001
70
80
10
1628 G02
60
50
0.01
0.1
1
100
90
VIN = 10V
VIN = 15V
VIN = 7V
VIN = 20V
VIN = 15V
VOUT = 5V
INPUT VOLTAGE (V)
5
70
80
1628 G03
60
50
15
25
35
100
VOUT = 5V
IOUT = 3A
90
Efficiency vs Output Current
(Figure 13)
Efficiency vs Input Voltage
(Figure 13)
INTVCC and EXTVCC Switch
Voltage vs Temperature
Supply Current vs Input Voltage
and Mode (Figure 13)
INPUT VOLTAGE (V)
05
0
400
1000
10
20
25
1628 G04
200
800
600
15
30
35
BOTH
CONTROLLERS ON
STANDBY
SHUTDOWN
EXTVCC Voltage Drop
CURRENT (mA)
0
150
200
250
40
1628 G05
100
50
0
10
20
30
50
TEMPERATURE (
°C)
–50
4.95
5.00
5.05
25
75
1628 G06
4.90
4.85
–25
0
50
100
125
4.80
4.70
4.75
INTVCC VOLTAGE
EXTVCC SWITCHOVER THRESHOLD
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS



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