LTC1878 LINER [Linear Technology], LTC1878 Datasheet - Page 3

• Manufacturer Part Number: LTC1878
• Description: High Efficiency Monolithic Synchronous Step-Down Regulator
• Manufacturer: LINER [Linear Technology]

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1878E 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
ELECTRICAL CHARACTERISTICS
The
V
SYMBOL
I
I
V
I
V
I
TYPICAL PERFOR A CE CHARACTERISTICS
PK
LSW
SYNC/MODE
RUN
SYNC/MODE
RUN
IN
100
LTC1878EMS8: T
95
90
80
75
70
60
= 3.6V unless otherwise specified.
85
65
2
Efficiency vs Input Voltage
denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 C.
Burst Mode OPERATION
V
L = 10 H
J
OUT
is calculated from the ambient temperature T
D
= 2.5V
3
PARAMETER
Peak Inductor Current
SW Leakage
SYNC/MODE Threshold
SYNC/MODE Leakage Current
RUN Threshold
RUN Input Current
according to the following formulas:
I
I
LOAD
LOAD
INPUT VOLTAGE (V)
4
= 100mA
= 300mA
J
= T
I
LOAD
A
5
+ (P
= 0.1mA
I
LOAD
D
I
LOAD
)(150 C/W)
6
= 10mA
W
= 1mA
7
1878 G01
U
8
CONDITIONS
V
V
V
V
IN
RUN
SYNC/MODE
RUN
A
100
and power
90
80
70
60
50
40
30
20
10
= 3.3V, V
0
= 0V, V
Rising
0.1
Efficiency vs Output Current
V
V
IN
IN
= 3.6V
= 3.6V
Rising
FB
SW
V
IN
= 0.7V, Duty Cycle < 35%
1
OUTPUT CURRENT (mA)
= 0V or 6V, V
= 4.2V
V
IN
= 4.2V
PULSE SKIPPING MODE
Burst Mode OPERATION
V
L = 10 H
10
Note 4: The LTC1878 is tested in a feedback loop which servos V
balance point for the error amplifier (V
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
OUT
IN
= 1.8V
= 6V
100
1878 G02
1000
95
90
85
80
75
70
65
60
55
50
0.1
Efficiency vs Output Current
Burst Mode OPERATION
V
V
MIN
0.8
0.2
0.2
IN
OUT
L = 15 H
= 6V
ITH
= 2.5V
= 1.2V).
1
OUTPUT CURRENT (mA)
L = 10 H
TYP
1.0
1.0
0.7
0.01
0.01
0.01
10
LTC1878
MAX
1.25
1.5
1.5
1
1
1
100
FB
to the
1878 G03
UNITS
3
1000
A
A
V
A
V
A