SC1592ISTRT Semtech, SC1592ISTRT Datasheet - Page 6

• Manufacturer Part Number: SC1592ISTRT
• Description: IC ADJ REG LDO 3A 8SOIC
• Manufacturer: Semtech

Specifications of SC1592ISTRT

• Regulator Topology: Positive Adjustable
• Voltage - Output: Adjustable
• Voltage - Input: 1.25 ~ 16 V
• Voltage - Dropout (typical): 0.26V @ 3A
• Number Of Regulators: 1
• Current - Output: 3A
• Current - Limit (min): 5A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SC1592ISTR

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
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
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:
where I
V
R
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
then 75m .
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
This commands the use of 0.5% or better accuracy
resistors to build a precision power supply.
POWER MANAGEMENT
Application Information
OUT
LIM
2004 Semtech Corp.
= programmable current limit resistor
= regulated output voltage
LIM
= selected current limit value
REF
= 0.8V 1% over full temperature range.
I
LIM
CNTL
240
IN
and V
. The voltage of this supply
R
LIM
V
OUT
CNTL
up to 16V, providing
to greater
6
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
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
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.
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.
+3.3V Vcntl
+2.5V Vin
2.2uF
22uF
C1
V
V
C2
REF
OUT
0
1 (
8 .
10k
V
R
R
typ
2
3
CNTL
IN
)
EN
.
V
SC1592
REF
Figure 2
GND
JA
= 36.5°C/W mount on the
SENSE
ILIM
OUT
100
R1
JA
Additionally, bulk
= 29°C/W mount
66.5
R3
53
R2
SC1592
www.semtech.com
+1.8V Vout
100uF
C3