參數(shù)資料
型號(hào)： LT3580MPMS8E#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 289K
代理商： LT3580MPMS8E#PBF
LT3580
14
3580fg
APPLICATIONS INFORMATION
source voltage conditions. UVLO prevents the regulator
from operating at source voltages where these problems
might occur.
The shutdown pin comparator has voltage hysteresis with
typical thresholds of 1.32V (rising) and 1.29V (falling).
Resistor RUVLO2 is optional. RUVLO2 can be included
to reduce the overall UVLO voltage variation caused by
variations in SHDN pin current (see the Electrical Character-
istics). A good choice for RUVLO2 is ≤10k ±1%. After
choosing a value for RUVLO2, RUVLO1 can be determined
from either of the following:
R
UVLO1 =
V
IN
+ 1.32V
1.32V
R
UVLO2
+11.6μA
or
R
UVLO1 =
V
IN
1.29V
1.29V
R
UVLO2
+11.6μA
where VIN+ and VIN– are the VIN voltages when rising or
falling respectively.
For example, to disable the LT3580 for VIN voltages below
3.5V using the single resistor configuration, choose:
R
UVLO1 =
3.5V
1.29V
∞
+11.6μA
=190.5k
Figure 7. Configurable UVLO
To activate the LT3580 for VIN voltage greater than
4.5V using the double resistor configuration, choose
RUVLO2 = 10k and:
R
UVLO1 =
4.5V
1.32V
10k
+11.6μA
=22.1k
Internal Undervoltage Lockout
The LT3580 monitors the VIN supply voltage in case VIN
drops below a minimum operating level (typically about
2.3V). When VIN is detected low, the power switch is
deactivated, and while sufficient VIN voltage persists, the
soft-start capacitor is discharged. After VIN is detected
high, the power switch will be reactivated and the soft-start
capacitor will begin charging.
Thermal Considerations
For the LT3580 to deliver its full output power, it is imperative
that a good thermal path be provided to dissipate the heat
generated within the package. This is accomplished by
taking advantage of the thermal pad on the underside of
the IC. It is recommended that multiple vias in the printed
circuit board be used to conduct heat away from the IC and
into a copper plane with as much area as possible.
Thermal Lockout
If the die temperature reaches approximately 165°C, the
part will go into thermal lockout, the power switch will be
turned off and the soft-start capacitor will be discharged.
The part will be enabled again when the die temperature
has dropped by ~5°C (nominal).
Thermal Calculations
Power dissipation in the LT3580 chip comes from four
primary sources: switch I2R loss, NPN base drive (AC), NPN
base drive (DC), and additional input current. The following
formulas can be used to approximate the power losses.
These formulas assume continuous mode operation,
RUVLO2
(OPTIONAL)
1.3V
RUVLO1
3580 F07
VIN
ACTIVE/
LOCKOUT
GND
11.6μA
AT 1.3V
–
+
SHDN
相關(guān)PDF資料
PDF描述
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