參數(shù)資料
型號(hào)： LTC1628CG
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 3 A SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.209 INCH, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 375K
代理商： LTC1628CG
17
LTC1628-SYNC
INTV
CC
Regulator
An internal P-channel low dropout regulator produces 5V
at the INTV
CC
pin from the V
IN
supply pin. INTV
CC
powers
the drivers and internal circuitry within the LTC1628-
SYNC. The INTV
CC
pin regulator can supply a peak current
of 50mA and must be bypassed to ground with a mini-
mum of 4.7
μ
F tantalum, 10
μ
F special polymer, or low
ESR type electrolytic capacitor. A 1
μ
F ceramic capacitor
placed directly adjacent to the INTV
CC
and PGND IC pins
is highly recommended. Good bypassing is necessary to
supply the high transient currents required by theMOSFET
gate drivers and to prevent interaction between channels.
Higher input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the maxi-
mum junction temperature rating for the LTC1628-SYNC
to be exceeded. The system supply current is normally
dominated by the gate charge current. Additional external
loading of the INTV
CC
and 3.3V linear regulators also
needs to be taken into account for the power dissipation
calculations. The total INTV
CC
current can be supplied by
either the 5V internal linear regulator or by the EXTV
CC
input pin. When the voltage applied to the EXTV
CC
pin is
less than 4.7V, all of the INTV
CC
current is supplied by the
internal 5V linear regulator. Power dissipation for the IC in
this case is highest: (V
IN
)(I
INTVCC
), and overall efficiency
is lowered. The gate charge current is dependent on
operating frequency as discussed in the Efficiency Consid-
erations section. The junction temperature can be esti-
mated by using the equations given in Note 2 of the
Electrical Characteristics. For example, the LTC1628-SYNC
V
IN
current is limited to less than 24mA from a 24V supply
when not using the EXTV
CC
pin as follows:
T
J
= 70
°
C + (24mA)(24V)(95
°
C/W) = 125
°
C
Use of the EXTV
CC
input pin reduces the junction tempera-
ture to:
T
J
= 70
°
C + (24mA)(5V)(95
°
C/W) = 81
°
C
Dissipation should be calculated to also include any added
current drawn from the internal 3.3V linear regulator. To
prevent maximum junction temperature from being ex-
ceeded, the input supply current must be checked operat-
ing in continuous mode at maximum V
IN
.
EXTV
CC
Connection
The LTC1628-SYNC contains an internal P-channel MOS-
FET switch connected between the EXTV
CC
and INTV
CC
pins. When the voltage applied to EXTV
CC
rises above
4.7V, the internal regulator is turned off and the switch
closes, connecting the EXTV
CC
pin to the INTV
CC
pin
thereby supplying internal power. The switch remains
closed as long as the voltage applied to EXTV
CC
remains
above 4.5V. This allows the MOSFET driver and control
power to be derived from the output during normal opera-
tion (4.7V < V
OUT
< 7V) and from the internal regulator
when the output is out of regulation (start-up, short-
circuit). If more current is required through the EXTV
CC
switch than is specified, an external Schottky diode can be
added between the EXTV
CC
and INTV
CC
pins. Do not apply
greater than 7V to the EXTV
CC
pin and ensure that
EXTV
CC
<V
IN
.
Significant efficiency gains can be realized by powering
INTV
CC
from the output, since the V
IN
current resulting
from the driver and control currents will be scaled by a
factor of (Duty Cycle)/(Efficiency). For 5V regulators this
supply means connecting the EXTV
CC
pin directly to V
OUT
.
However, for 3.3V and other lower voltage regulators,
additional circuitry is required to derive INTV
CC
power
from the output.
The following list summarizes the four possible connec-
tions for EXTV
CC:
1. EXTV
CC
Left Open (or Grounded). This will cause INTV
CC
to be powered from the internal 5V regulator resulting in
an efficiency penalty of up to 10% at high input voltages.
2. EXTV
CC
Connected directly to V
OUT
. This is the normal
connection for a 5V regulator and provides the highest
efficiency.
3. EXTV
CC
Connected to an External supply. If an external
supply is available in the 5V to 7V range, it may be used to
power EXTV
CC
providing it is compatible with the MOSFET
gate drive requirements.
4. EXTV
CC
Connected to an Output-Derived Boost Net-
work. For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTV
CC
to an
output-derived voltage that has been boosted to greater
APPLICATIOU
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U
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