LTC1735IS Linear Technology, LTC1735IS Datasheet - Page 4

• Manufacturer Part Number: LTC1735IS
• Description: IC REG SW STEP-DOWN SYNC 16-SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1735IS

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 6 V
• Current - Output: 3A
• Frequency - Switching: 300kHz
• Voltage - Input: 4 ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LTC1735
Note 3: The LTC1735 is tested in a feedback loop that servos V
the balance point for the error amplifier (V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Oscillator frequency is tested by measuring the C
current (I
TYPICAL PERFOR A CE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
4
100
100
95
90
85
80
75
70
f
90
80
70
60
50
40
30
20
OSC
0.001
0
Efficiency vs Load Current
(3 Operating Modes)
Efficiency vs Input Voltage
EXTV
V
FIGURE 1
EXTV
OUT
OSC
BURST
CC
CC
= 1.6V
) and applying the formula:
5
C
I
OPEN
OPEN
OUT
0.01
8 477 10
OSC
.
INPUT VOLTAGE (V)
LOAD CURRENT (A)
= 0.5A
10
SYNC
( )
pF
(
0.1
15
11
11
)
CONTINUOUS
I
OUT
20
= 5A
I
V
V
R
f
CHG
O
W
IN
OUT
1
S
1
= 300kHz
= 0.01
= 10V
25
= 3.3V
1735 G01
1735 G04
ITH
I
U
DIS
1
= 1.2V).
10
30
–
1
–0.3
–0.4
–0.1
–0.2
OSC
100
90
80
70
60
50
40
0
0.01
0
charge
Efficiency vs Load Current
Load Regulation
EXTV
FIGURE 1
OSENSE
V
IN
CC
= 5V
2
= 5V
V
to
IN
LOAD CURRENT (A)
LOAD CURRENT (A)
0.1
= 24V
V
4
IN
= 15V
Note 6: The minimum on-time condition corresponds to an inductor peak-
to-peak ripple current 40% of I
Considerations in the Applications Information section).
Note 7: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 8: The LTC1735E is guaranteed to meet performance specifications
from 0 C to 85 C. Specifications over the –40 C to 85 C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC1735I specifications are
guaranteed over the full –40 C to 85 C operating temperature range.
6
1
FCB = 0V
V
FIGURE 1
8
IN
= 15V
1735 G05
1735 G02
10
10
500
400
300
200
100
100
95
90
85
80
75
70
MAX
0
0
0
Efficiency vs Input Voltage
V
vs Load Current
R
V
EXTV
V
FIGURE 1
IN
OUT
(see Minimum On-Time
SENSE
OUT
– V
CC
= 5V – 5% DROP
= 1.6V
5
2
= 0.005
= 5V
OUT
INPUT VOLTAGE (V)
LOAD CURRENT (A)
10
Dropout Voltage
4
I
OUT
15
= 0.5A
I
OUT
6
20
= 5A
8
25
1735 G03
1735 G06
1735fc
10
30