LTC3728LX Linear Technology, LTC3728LX Datasheet - Page 4

• Manufacturer Part Number: LTC3728LX
• Description: 2-Phase Synchronous Regulators
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3728L/LTC3728LX
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
3.3V Linear Regulator
V
V
V
PGOOD Output
V
I
V
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 IC is tested in a feedback loop that servos V
specified voltage and measures the resultant V
Note 4: Dynamic supply current is higher due to the gate charge being
4
PGOOD
3.3OUT
3.3IL
3.3VL
PGL
PG
100
60
LTC3728LUH/LTC3728LXUH: T
LTC3728LGN: T
90
80
70
50
40
30
20
10
0
0.001
Efficiency vs Output Current
and Mode (Figure 13)
OPERATION
Burst Mode
J
is calculated from the ambient temperature T
D
according to the following formulas:
0.01
PARAMETER
3.3V Regulator Output Voltage
3.3V Regulator Load Regulation
3.3V Regulator Line Regulation
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
OUTPUT CURRENT (A)
J
= T
CONSTANT
FREQUENCY
(BURST DISABLE)
A
0.1
+ (P
FORCED
CONTINUOUS
MODE (PWM)
D
• 95 C/W)
J
1
W
= T
V
V
f = 250kHz
IN
OUT
A
= 15V
3728L G01
+ (P
= 5V
U
10
D
OSENSE1, 2.
• 34 C/W)
A
ITH1, 2
100
90
80
70
60
50
and power
CONDITIONS
No Load
I
6V < V
I
V
V
0.001
3.3
PGOOD
PGOOD
OSENSE
V
V
Efficiency vs Output Current
(Figure 13)
A
OSENSE
OSENSE
= 0 to 10mA
= 25 C. V
to a
IN
= 2mA
= 5V
with Respect to Set Output Voltage
< 30V
The
0.01
Ramping Negative
Ramping Positive
V
OUTPUT CURRENT (A)
IN
= 20V
IN
V
V
IN
denotes the specifications which apply over the full operating
= 15V, V
IN
= 7V
V
= 15V
0.1
IN
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: The LTC3728LC/LTC3728LXC are guaranteed to meet
performance specifications from 0 C to 85 C. The LTC3728LE is
guaranteed to meet performance specifications over the –40 C to 85 C
operating temperature range as assured by design, characterization and
correlation with statistical process controls.
= 10V
RUN/SS1, 2
1
V
f = 250kHz
OUT
3728L G02
= 5V
= 5V unless otherwise noted.
10
100
90
80
70
60
50
5
Efficiency vs Input Voltage
(Figure 13)
MIN
MAX
3.2
– 6
6
(see minimum on-time
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INPUT VOLTAGE (V)
15
3.35
0.05
–7.5
TYP
0.5
0.1
7.5
MAX
25
3.45
– 9.5
0.2
0.3
9.5
2
1
V
I
f = 250kHz
OUT
OUT
3728L G03
= 3A
3728lxfa
UNITS
= 5V
35
%
%
%
%
V
V
A