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LTC3828 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3828
Description  Dual 2-Phase Step-Down Controller with Tracking
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3828 Datasheet(HTML) 4 Page - Linear Technology

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LTC3828
3828f
OUTPUT CURRENT (A)
0.001
10
3828 G01
0.01
0.1
1
OUTPUT CURRENT (A)
0.001
10
0.01
0.1
1
100
90
80
70
60
50
40
30
20
10
0
3828 G02
100
90
80
70
60
50
INPUT VOLTAGE (V
5
100
90
80
70
60
50
25
3828 G03
10
15
20
30
TEMPERATURE (
°C)
–50
3.8
3.6
3.4
3.2
3.0
100
3828 G06
–25
0
25
50
75
125
3828 G05
INPUT VOLTAGE (V)
0
1200
1000
800
600
400
200
0
5.2
5.0
4.8
4.6
4.4
4.2
4.0
510
15
20
3828 G04
25
30
INPUT VOLTAGE (V)
0
5
10
15
20
25
30
Burst Mode
OPERATION
FORCED
CONTINUOUS
MODE
CONSTANT
FREQUENCY
(BURST DISABLE)
VOUT = 5V
F = 260kHz
VIN =15V
VOUT = 5V
F = 260kHz
VOUT = 5V
IOUT = 3A
F = 260kHz
VIN = 7V
VIN = 20V
VIN = 15V
BOTH CONTROLLERS ON
SHUTDOWN
ILOAD = 1mA
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:
LTC3828UH: TJ = TA + (PD • 34°C/W)
LTC3828G: TJ = TA + (PD • 95°C/W)
Note 3: The IC 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).
Note 7: The LTC3828E is guaranteed to meet performance specifications
over the –40
°C to 85°C operating temperature range as assured by design,
characterization and correlation with statistical process controls.
Efficiency vs Output Current
and Mode (Figure 14)
Efficiency vs Output Current
(Figure 14)
Efficiency vs Input Voltage
(Figure 14)
TYPICAL PERFOR A CE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
Internal 5V LDO Line Regulation
Undervoltage Lockout vs
Temperature
Supply Current vs Input Voltage
(Figure 14)
TA = 25°C unless otherwise noted.



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