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參數(shù)資料
| 型號： | LTC3816IUHF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC38 |
| 封裝： | 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 9/44頁 |
| 文件大?。?/td> | 753K |
| 代理商： | LTC3816IUHF#TRPBF |
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LTC3816
3816f
applicaTions inForMaTion
LDO, INTVCC/EXTVCC POWER SUPPLY
The LTC3816 is designed to operate with a wide range of
VIN input voltages. The IC includes a 5.2V LDO to power
the driver and control circuits. The LDO output, INTVCC
should be bypassed with a minimum 4.7F low ESR
ceramic capacitor. The INTVCC regulator can supply up to
50mA of total LTC3816 quiescent current, IQ(TOT), which
consists of the static supply current, IQ, and the current
required to charge the gate capacitance, QG(TOT), of the
top and bottom power MOSFETs.
IQ(TOT) = IQ + QG(TOT) fOSC
PDISS = VIN (IQ + QG(TOT) fOSC)
TJ = TA + PDISS θJA
The value of QG(TOT) can be obtained from the MOSFET
data sheets. For high VIN and high frequency operation,
care must be taken to ensure that the maximum junction
temperature TJMAX of the IC is never exceeded.
When the EXTVCC pin is left open or tied to a voltage less
than 4.5V, the 5.2V LDO powers INTVCC. If EXTVCC is taken
above 4.5V, the LDO is turned off and an internal switch
connects INTVCC to EXTVCC. Do not apply greater than 6V
to the EXTVCC pin, and ensure that EXTVCC < VIN + 0.3V
unless EXTVCC is shorted to the VIN supply. Using the
EXTVCC pin allows INTVCC to be powered from an external
source reducing LDO losses and improving the regulator
efficiency, especially at high VIN. When the EXTVCC pin is
used, the chip power dissipation reduces to:
PDISS = VEXTVCC (IQ + QG(TOT) fOSC)
If the VIN supply is low enough for the INTVCC LDO to enter
dropout, the output voltage of the LDO becomes:
VINTVCC(DROPOUT) = VIN – VDROPOUT
The LDO dropout voltage is a function of the total quies-
cent current IQ(TOT), VIN voltage and junction temperature.
The temperature coefficient of the LDO dropout voltage
is approximately 6400ppm/°C. To enable proper opera-
tion, make sure that the LDO output voltage meets the
INTVCC undervoltage and minimum MOSFET gate driver
requirements. If VIN is connected to a fixed 5V supply, it is
advisable to short EXTVCC to VIN. In this case, the INTVCC
output voltage becomes:
VINTVCC(EXTVCC) = VEXTVCC – IQ(TOT) REXTVCC
whereREXTVCCistheinternalEXTVCCswitchon-resistance.
It has a typical value of 2 at 25°C and has a temperature
coefficient of approximately 4000ppm/°C.
UNDERVOLTAGE LOCKOUT AND SHUTDOWN
A precision undervoltage lockout (UVLO) comparator
monitors the INTVCC voltage and enables soft-start opera-
tion once INTVCC is above 3.9V. For power supplies that
start-up slowly, the gate drivers could begin switching
when VIN is well below its steady-state value. The high
inrush current through the input power cable could cause
the VIN supply to dip below the UVLO threshold and result
in hiccup operation at start-up. This problem can be eas-
ily overcome by adding a VIN UVLO function as shown in
Figure 3. Connect an external resistive divider from VIN to
VRON. Set the resistive divider according to the following
equation:
V
V V
R
UVLO
IN UVLO
ON
=
+
1 2
1
2
.
(
)
where VIN(UVLO) is the desired VIN UVLO threshold. The
resistances are normally chosen so that the error caused
by the internal 1A pull-up current has a negligible effect
on the UVLO threshold. Be careful not to allow the resistive
divider output voltage to exceed the 6V maximum rating
of the VRON pin.
If the external resistive divider is not used, upon power-
up, the VRON pin is pulled up by an internal 1A pull-up
current. The LTC3816 can be put into a low power shut-
Figure 3. VIN UVLO Circuit
+
–
SHUTDOWN
RON2
VIN
VRON
1A
LTC3816
ON
RON1
1.2V
3816 F03
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