LTC3707 Linear Technology, LTC3707 Datasheet - Page 4

• Manufacturer Part Number: LTC3707
• Description: High Efficiency / 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

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: T
dissipation P
Note 4: The LTC3707 is tested in a feedback loop that servos V
specified voltage and measures the resultant V
TYPICAL PERFOR A CE CHARACTERISTICS
4
1000
100
800
600
400
200
60
LTC3707EGN = T
90
80
70
50
40
30
20
10
0
0
0.001
0
Supply Current vs Input Voltage
and Mode (Figure 13)
Efficiency vs Output Current
and Mode (Figure 13)
OPERATION
Burst Mode
J
is calculated from the ambient temperature T
5
D
according to the following formula:
SHUTDOWN
0.01
STANDBY
OUTPUT CURRENT (A)
INPUT VOLTAGE (V)
10
J
= T
BOTH
CONTROLLERS ON
CONSTANT
FREQUENCY
(BURST DISABLE)
0.1
15
A
+ (P
FORCED
CONTINUOUS
MODE (PWM)
D
20
• 85 C/W)
1
W
V
V
IN
OUT
25
= 15V
3707 G01
3707 G04
= 5V
U
10
30
OSENSE1, 2.
A
200
150
100
100
90
80
70
60
50
50
and power
0.001
0
0
Efficiency vs Output Current
(Figure 13)
EXTV
V
V
IN
OUT
ITH1, 2
= 15V
= 5V
CC
0.01
10
to a
Voltage Drop
V
OUTPUT CURRENT (A)
IN
= 20V
CURRENT (mA)
V
V
IN
IN
= 7V
V
= 15V
0.1
20
IN
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 I
considerations in the Applications Information section).
Note 8: V
resistance.
= 10V
30
FREQSET
1
3707 G02
3707 G05
pin internally tied to a 1.19V reference through a large
10
40
5.05
5.00
4.85
4.75
4.70
4.95
4.90
4.80
100
90
70
80
50
60
– 50
5
Efficiency vs Input Voltage
(Figure 13)
INTV
Voltage vs Temperature
V
I
OUT
OUT
– 25
MAX
CC
= 3A
= 5V
EXTV
(see minimum on-time
and EXTV
0
INPUT VOLTAGE (V)
TEMPERATURE ( C)
CC
SWITCHOVER THRESHOLD
INTV
15
25
CC
CC
50
VOLTAGE
Switch
75
25
100
3707 G03
3707 G06
3707f
125
30