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SC1592 Fiches technique(PDF) 6 Page - Semtech Corporation

No de pièce SC1592
Description  Low Dropout High Performance Adjustable Positive Voltage Regulator
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Fabricant  SEMTECH [Semtech Corporation]
Site Internet  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC1592 Fiches technique(HTML) 6 Page - Semtech Corporation

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 2004 Semtech Corp.
www.semtech.com
SC1592
POWER MANAGEMENT
Application Information
The SC1592 is a 3A low dropout high performance linear
voltage regulator. The SC1592 can be used for voltage
applications as low as 0.8V and is ideal for down
conversion utilizing dual supply configuration. This allows
for extremely low dropout voltages with excellent load
and line regulation. The SC1592 can be utilized in high
voltage applications, with V
IN and VCNTL up to 16V, providing
there is adequate thermal management.
SC1592 is designed to meet stringent requirements of
current generation microprocessors and other sensitive
electronic devices. This is possible by employing an
additional bias source, V
CNTL. The voltage of this supply
needs to be at least 1.5V greater than the output voltage
in order to achieve low dropout, typically less then
300mV.
Unlike most of the other high current linear regulators,
the SC1592 provides a programmable current limit which
can be set with a single resistor. The value of the
programming resistor is:
LIM
OUT
LIM
R
V
240
I
where I
LIM = selected current limit value
V
OUT = regulated output voltage
R
LIM = programmable current limit resistor
The SC1592 has a fast transient response that allows it
to handle large load changes associated with high current
applications. Proper selection of the of the output
capacitor and it’s ESR value determines stable operation
and optimizes performance.
The typical application shown in Figure 2 was tested with
a wide range of different capacitors. The circuit was found
to be unconditionally stable with capacitor values from
47µF to 330µF and ESR ranging from 0.5m
Ω to greater
then 75m
Ω.
It’s recommended to maintain 5-10mA through the output
divider network in order to have a tight load and line
regulation. Initial accuracy of the internal voltage
reference V
REF = 0.8V ±1% over full temperature range.
This commands the use of 0.5% or better accuracy
resistors to build a precision power supply.
C1
2.2uF
C2
22uF
R1
C3
100uF
R3
R2
+1.8V Vout
+3.3V Vcntl
+2.5V Vin
SC1592
CNTL
IN
OUT
SENSE
ILIM
EN
GND
10k
66.5
53
100
Figure 2
The circuit in Figure 2 shows a typical application of 2.5V
to 1.8V conversion with a 3.3V control supply and the
load range of up to 3A steady state. Considering the
approximate 2W power being dissipated by the pass
element of the SC1592, we are still able to choose an
SO-8 EDP package with T
JA = 36.5°C/W mount on the
1sq.in. copper pad allocated for adequate heat transfer.
The ambient temperature in this case should not exceed
50°C. If this temperature range is too restrictive, then
the DDPAK can be utilized, having T
JA = 29°C/W mount
on the same size copper pad.
Input capacitor: A minimum of 10µF ceramic capacitor
is recommended to be placed directly next to the Vin pin.
This allows for the device being some distance from any
bulk capacitance on the rail. Additionally, bulk
capacitance may be added closely to the input supply
pin of the SC1592 to ensure that Vin does not sag,
improving load transient response.
Output capacitor: A minimum bulk capacitance of 33µF,
along with a 0.1µF ceramic decoupling capacitor is
recommended. Increasing the bulk capacitance will
improve the overall transient response. The use of
multiple lower value ceramic capacitors in parallel to
achieve the desired bulk capacitance will not cause
stability issues. Although designed for use with ceramic
output capacitors, the SC1592 is extremely tolerant of
output capacitor ESR values and thus will also work
comfortably with tantalum output capacitors.
.
typ
V
8
.
0
V
V
)
3
R
2
R
1
(
V
REF
REF
OUT
=
+
=


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