LTC3854 LINER [Linear Technology], LTC3854 Datasheet - Page 4

• Manufacturer Part Number: LTC3854
• Description: Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

LTC3854
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3854E 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 LTC3854I is guaranteed to meet
performance specifications over the full –40°C to 85°C operating
temperature range.
Note 3: T
dissipation PD according to the following formulas:
Typical perForMance characTerisTics
LOAD STEP

200mV/DIV
10A/DIV
LTC3854DDB: T
LTC3854MSE: T
5A/DIV
5V
I
LOAD
OUT
J
is calculated from the ambient temperature T
5A Load Step V
J
J
= T
100
= T
98
96
94
92
90
88
86
A
A
1
Efficiency vs Output Current
+ (P
+ (P
V
V
50µs/DIV
IN
IN
V
OUT
IN
2
= 12V
= 6V
D
D
= 24V
• 76°C/W)
• 40°C/W)
= 5V, V
3
V
IN
LOAD CURRENT (A)
4
= 32V
IN
5
= 24V
3854 G03
6
(SEE FIGURE 9)
7
V
8
A
OUT
and power
BG
TG
9
= 5V
3854 G01
Top Gate and Bottom Gate in
Forced Continuous Mode
10
4µs/DIV
Note 4: The LTC3854 is tested in a feedback loop that servos V
specified voltage and measures the resultant V
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. Not 100% tested in production.
Note 7: The minimum on-time condition is specified for an inductor peak-
to-peak ripple current 40% of I
in the Applications Information section).
Note 8: The LTC3854 maximum LDO current specification assumes there
is no external DC load current being pulled from INTV
99
98
97
96
95
94
93
5
Efficiency vs Input Voltage
(SEE FIGURE 9)
10
3854 G04
I
OUT
15
= 10A
I
OUT
20
V
IN
= 5A
BG
TG
MAX
(V)
25
Top Gate and Bottom Gate in
Dropout
(see Minimum On-Time Considerations
30
V
OUT
35
= 5V
3854 G02
FB
.
40
4µs/DIV
CC
pin.
ITH
to a
3854 G05
3854fa