LTC3728LXC(RevA) 查看數據表（PDF） - Linear Technology
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LTC3728LXC Datasheet PDF : 32 Pages
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LTC3728L/LTC3728LX
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
3.3V Linear Regulator
V3.3OUT
3.3V Regulator Output Voltage
V3.3IL
3.3V Regulator Load Regulation
V3.3VL
3.3V Regulator Line Regulation
PGOOD Output
VPGL
IPGOOD
VPG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
CONDITIONS
No Load
I3.3 = 0 to 10mA
6V < VIN < 30V
IPGOOD = 2mA
VPGOOD = 5V
VOSENSE with Respect to Set Output Voltage
VOSENSE Ramping Negative
VOSENSE Ramping Positive
MIN TYP MAX UNITS
q 3.2
3.35 3.45
V
0.5
2
%
0.05
0.2
%
0.1
0.3
V
±1
µA
–6
–7.5 – 9.5
%
6
7.5
9.5
%
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3728LUH/LTC3728LXUH: TJ = TA + (PD • 34°C/W)
LTC3728LGN: TJ = TA + (PD • 95°C/W)
Note 3: The IC is tested in a feedback loop that servos VITH1, 2 to a
specified voltage and measures the resultant VOSENSE1, 2.
Note 4: Dynamic supply current is higher due to the gate charge being
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 IMAX (see minimum on-time
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.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
and Mode (Figure 13)
100
Burst Mode
90 OPERATION
80
70
FORCED
60
CONTINUOUS
50
MODE (PWM)
40
30
20
10
0
0.001
CONSTANT
FREQUENCY
(BURST DISABLE)
VIN = 15V
VOUT = 5V
f = 250kHz
0.01
0.1
1
10
OUTPUT CURRENT (A)
3728L G01
Efficiency vs Output Current
(Figure 13)
100
VIN = 7V
90
VIN = 10V
80
VIN = 15V
VIN = 20V
70
60
50
0.001
VOUT = 5V
f = 250kHz
0.01
0.1
1
OUTPUT CURRENT (A)
10
3728L G02
Efficiency vs Input Voltage
(Figure 13)
100
90
80
70
60
VOUT = 5V
IOUT = 3A
f = 250kHz
50
5
15
25
35
INPUT VOLTAGE (V)
3728L G03
3728lxfa
4
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