LTC3728 Linear Technology, LTC3728 Datasheet - Page 4

• Manufacturer Part Number: LTC3728
• Description: 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3728
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
3.3V Linear Regulator
V
V
V
PGOOD Output
V
I
V
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
reliabilty and lifetime.
Note 2: T
dissipation P
Note 3: The LTC3728 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
SYMBOL
PGOOD
3.3OUT
3.3IL
3.3VL
PGL
PG
100
60
LTC3728: 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
J
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
= T
OUTPUT CURRENT (A)
A
+ (P
CONSTANT
FREQUENCY
(BURST DISABLE)
0.1
D
FORCED
CONTINUOUS
MODE (PWM)
• 95 °C/W)
1
W
V
V
f = 250kHz
IN
OUT
= 15V
3728 G01
= 5V
U
10
OSENSE1, 2.
A
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
ITH1, 2
IN
= 2mA
= 5V
with Respect to Set Output Voltage
< 30V
The
0.01
Ramping Negative
Ramping Positive
to a
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 LTC3728E 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.
= 10V
RUN/SS1, 2
1
V
f = 250kHz
OUT
3728 G02
= 5V
= 5V unless otherwise noted.
10
100
90
80
70
50
60
●
5
Efficiency vs Input Voltage
(Figure 13)
3.25
MIN
MAX
– 6
6
(see minimum on-time
www.DataSheet4U.com
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
±1
9.5
2
V
I
f = 250kHz
OUT
OUT
3728 G03
= 3A
UNITS
= 5V
3728fb
35
µA
%
%
%
%
V
V