LTC1628-PG Linear Technology, LTC1628-PG Datasheet - Page 4

• Manufacturer Part Number: LTC1628-PG
• Description: High Efficiency/ 2-Phase Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

LTC1628/LTC1628-PG
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
dissipation P
Note 3: The LTC1628/LTC1628-PG are tested in a feedback loop that
servos V
V
TYPICAL PERFOR A CE CHARACTERISTICS
4
OSENSE1, 2.
1000
100
800
600
400
200
60
LTC1628/LTC1628-PG: 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
ITH1, 2
Burst Mode
J
is calculated from the ambient temperature T
5
D
SHUTDOWN
STANDBY
according to the following formulas:
0.01
to a specified voltage and measures the resultant
OUTPUT CURRENT (A)
10
INPUT VOLTAGE (V)
BOTH
CONTROLLERS ON
15
CONSTANT
FREQUENCY
(BURST DISABLE)
0.1
FORCED
CONTINUOUS
MODE
20
J
= T
A
25
+ (P
1
W
V
V
IN
OUT
D
30
= 15V
• 95 C/W)
1628 G01
1628 G04
= 5V
U
10
35
A
250
200
100
150
100
90
80
70
60
50
50
and power
0.001
0
0
Efficiency vs Output Current
(Figure 13)
EXTV
V
V
IN
OUT
= 15V
= 5V
CC
10
0.01
Voltage Drop
V
OUTPUT CURRENT (A)
IN
= 20V
CURRENT (mA)
V
V
20
IN
IN
= 7V
V
= 15V
0.1
IN
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 I
considerations in the Applications Information section).
Note 7: V
resistance.
= 10V
30
FREQSET
1
40
1628 G02
1628 G05
pin internally tied to 1.19V reference through a large
10
50
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
– 25
MAX
CC
EXTV
(see minimum on-time
and EXTV
0
INPUT VOLTAGE (V)
TEMPERATURE ( C)
CC
15
SWITCHOVER THRESHOLD
INTV
25
CC
CC
50
VOLTAGE
Switch
25
75
V
I
OUT
OUT
100
1628 G03
1628 G06
= 3A
= 5V
125
35