LTC3707 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3707' PDF : 32 Pages View PDF
LTC3707
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3707E 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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC3707EGN = TJ = TA + (PD • 85°C/W)
Note 4: The LTC3707 is tested in a feedback loop that servos VITH1, 2 to a
specified voltage and measures the resultant VOSENSE1, 2.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: 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 8: VFREQSET pin internally tied to a 1.19V reference through a large
resistance.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
and Mode (Figure 13)
100
Burst Mode
90 OPERATION
80
70
FORCED
60
CONTINUOUS
MODE (PWM)
50
40
CONSTANT
FREQUENCY
30
(BURST DISABLE)
20
10
0
0.001
VIN = 15V
VOUT = 5V
0.01
0.1
1
10
OUTPUT CURRENT (A)
3707 G01
Supply Current vs Input Voltage
and Mode (Figure 13)
1000
800
600
BOTH
CONTROLLERS ON
400
200
0
0
STANDBY
SHUTDOWN
5 10 15 20
INPUT VOLTAGE (V)
25 30
3707 G04
Efficiency vs Output Current
(Figure 13)
100
VIN = 15V
VOUT = 5V
90
80
VIN = 7V
VIN = 10V
VIN = 15V
VIN = 20V
70
60
50
0.001
0.01
0.1
1
OUTPUT CURRENT (A)
10
3707 G02
EXTVCC Voltage Drop
200
150
100
50
0
0
10
20
30
40
CURRENT (mA)
3707 G05
4
Efficiency vs Input Voltage
(Figure 13)
100
90
80
70
60
VOUT = 5V
IOUT = 3A
50
5
15
25
30
INPUT VOLTAGE (V)
3707 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
3707 G06
3707f
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