LTC3727EG View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3727EG' PDF : 32 Pages View PDF
LTC3727/LTC3727-1
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
V3.3IL
V3.3VL
3.3V Regulator Output Voltage
3.3V Regulator Load Regulation
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 = 0mA to 10mA
6V < VIN < 30V (LTC3727)
6V < VIN < 30V (LTC3727-1)
IPGOOD = 2mA
VPGOOD = 5V
VOSENSE with Respect to Set Output Voltage
VOSENSE Ramping Negative
VOSENSE Ramping Positive
MIN TYP MAX UNITS
q 3.25 3.35 3.45
V
0.5
2.5
%
0.05
0.2
%
0.05
0.3
%
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: The LTC3727E/LTC3727E-1 are 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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3727EG/LTC3727EG-1: TJ = TA + (PD • 95 °C/W)
LTC3727EUH-1: TJ = TA + (PD • 34 °C/W)
Note 4: The LTC3727/LTC3727-1 are tested in a feedback loop that servos
VITH1, 2 to a specified voltage and measures the resultant VOSENSE1, 2.
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.
Note 7: 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).
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
and Mode (Figure 13)
100
Burst Mode
90 OPERATION
80
70
FORCED
CONTINUOUS
MODE
60
50
40
CONSTANT
FREQUENCY
30
(BURST DISABLE)
20
10
0
0.001
VIN = 15V
VOUT = 8.5V
0.01
0.1
1
10
OUTPUT CURRENT (A)
3727 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
0.01
0.1
1
10
OUTPUT CURRENT (A)
3727 G02
Efficiency vs Input Voltage
(Figure 13)
100
VOUT = 5V
IOUT = 3A
90
80
70
60
50
5
15
25
INPUT VOLTAGE (V)
35
3727 G03
3727f
4
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