SC1592M
Low Dropout High Performance
Adjustable Positive Voltage Regulator
HIGH-RELIABILITY PRODUCTS
Rev 2.1 1
Features
Wide input range, VIN = 1.25V to 16V
VCNTL = 3V to 16V
3A guaranteed output current
260mV (typ.) @ 3A dropout voltage in dual supply
mode
1% initial accuracy
Adjustable output voltage down to 0.8V
Programmable current limiting with thermal
shutdown
Fast transient response
Excellent line and load regulation
Military temperature range: -55°C to + 125°C
The SC1592 voltage regulator is available in SOIC-8L
EDP package
Pb-free, halogen free, RoHS / WEEE compliant
Description
The SC1592 is a 3A low dropout high performance linear
voltage regulator that provides a low voltage, high current
output with a minimum of external components, utilizing
dual supply configuration.
The SC1592 offers a wide input voltage range from 1.25V to
16V and is ideal for applications that need to convert down
to 0.8V.
Additionally, the SC1592 is fully protected with an
externally programmable current limit, and thermal
shutdown. Also, there is an EN input which enables or shuts
down the device.
Applications
Low voltage logic supplies
Microcontroller supplies
Post regulation
Typical Application Circuit
+2.5V V
IN
+3.3V V
CNTL
+1.8V V
OUT
CNTL
IN EN GND ILIM
SENSE
OUT
SC1592M
TTL
C1
1µF
C2
10µF R1
100
R2
66.5
R3
53
C3
47µF
.8.0
3
2
1
typVV
V
R
R
V
REF
REFOUT
=
•
+=
SC1592M
Rev 2.1 2
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the
Electrical Characteristics section is not implied.
Parameter Symbol Maximum Units
Power Input Voltage VIN 18 V
Control Input Voltage VCNTL 18 V
Output Current IOUT 5 A
Power Dissipation PD Internally limited W
Thermal Resistance Junction to Ambient ƟJA 36.5 °C/W
Thermal Resistance Junction to Case ƟJC 5.5 °C/W
Junction Temperature Range TJ -55 to +125 °C
Storage Temperature Range TSTG -65 to +150 °C
Lead Temperature (Soldering) 10 sec. TLEAD 300 °C
ESD Rating (Human Body Model) ESD 2 kV
Electrical Characteristics
Unless otherwise specified: VIN = 2.5V, VEN = VCNTL = 3.3V, VOUT = 1.8V, IOUT = 10mA, RLIM = 100Ω, TJ = TA = 25°C
Values in bold indicate -55°C < TJ < +125°C
Parameter Symbol Test Conditions Min Typ Max Units
Control Voltage VCNTL VOUT = VREF 3 16 V
Reference Voltage VREF VOUT = VREF 792 800 808 mV
Control Pin Current ICNTL_EN
VCNTL = VIN = VEN = 16
VOUT = VREF; IOUT = 0A
3 8
mA
VCNTL = VIN = VEN = 16
VOUT = VREF; IOUT = 3A
24
Control Pin Current in
Shutdown ICNTL_DIS
VCNTL = VIN = 16,
VEN = 0V 1 5 μA
SC1592M
Rev 2.1 3
Parameter Symbol Test Conditions Min Typ Max Units
VIN Line Regulation REG(LINE) 2.5V ≤ VIN ≤ 16V 0.01 0.1 %/V
VCNTL Line Regulation REG(CNTL)
3.3V ≤ VCNTL ≤ 16V
VOUT = VREF
0.1 0.4 %/V
Load Regulation (1) REG(LOAD)
10mA ≤ IOUT ≤ 2A, TJ = 25°C 0.8 1.5
%
10mA ≤ IOUT ≤ 3A, -55°C ≤ TJ ≤ +125°C 1.4 3
Dropout Voltage VDD
IOUT = 2A; VOUT = 0.98Vnom 160 320
mV
IOUT = 3A; VOUT = 0.98Vnom 260 520
Thermal Shutdown TSHUT 150 °C
Thermal Shutdown Hyst. 10 °C
SENSE Input Current 1 μA
Low Level EN 0.8 V
High Level EN 2 V
EN Input Current VEN = VCNTL = 5V 55 100 μA
EN Impedance 65 kΩ
Current Limit Accuracy (2) ILIM -20 +20 %
Notes:
(1) For load regulation use a 1ms current pulse width, d.c. ≤ 10% when measuring VOUT
(2) Current limit is programmable, see page 4
SC1592M
Rev 2.1 4
Pin Configuration
(1) Available in tape and reel only. A reel contains 2,500 devices. Contact factory for smaller quantities.
(2) Pb-free, halogen free, RoHS / WEEE compliant.
Device Marking
Marking for the SOIC EP 8 package:
(1)SC1592M: part number;
(2 )xxxxxxx: Semtech lot number;
(3) yyww: date code
Ordering Information
Part Number Package Temp. Range (TJ)
SC1592MSTRT SOIC-8L EDP -55°C to +125°C
SC1592M
SC1592M
Rev 2.1 5
Pin Description
Pin # Pin Name Pin Function
1 ILIM Externally programmable current limit should be set at < 5A.
2, 3 IN This is the collector input to the power device. The output load current is supplied through this
pin.
4 CNTL
This pin is the bias supply for the control circuitry. The current flow into this pin will be
approximately 1% of the output current. For the device to regulate, the voltage on this pin must
be at least 1.5V greater than the output voltage, but no less than VCNTL_MIN.
5,6 OUT This is the power output of the device.
7 SENSE This is a feedback input.
8 EN Enable input. When high, should be less than or equal to VCNTL.
PAD GND Ground.
SC1592M
Rev 2.1 6
Block Diagram
Thermal
Shutdown Amp
Current
Limit
Bandgap
Reference
+
-
IN
CNTL
OUT
SENSE
ILIM
GND
EN
*
+
-
R
ILIM
Figure 1
×≈
LIM
OUT
LIM I
V
R240
ILIM = Selected current limit value
VOUT = Regulated output voltage
RLIM = Externally programmable current limit resistor
Accuracy of the current limit setting is better than 20% over full operating temperature range.
* Internal ESD structure. In cases where EN is permanently tied to VIN, it’s recommended that a 10-20k resistor should be
inserted in the link between EN and VIN.
SC1592M
Rev 2.1 7
Description
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 VIN and VCNTL up to 16V, providing there is
adequate thermal management.
SC1592 is designed to meet stringent requirements of
current generation microcontrollers
and other sensitive
electronic devices. This is possible by employing an
additional bias source, VCNTL
. 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 than 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 I
V
R240
where ILIM = selected current limit value
VOUT = regulated output voltage
RLIM = 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 output capacitor and
its 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 0.5mΩ to greater than
75mΩ.
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
VREF = 0.8V ±1% over full temperature range. This
commands the use of 0.5% or better accuracy resistors to
build a precision power supply.
+2.5V VIN
+3.3V VCNTL +1.8V VOUT
CNTL
IN
EN GND ILIM
SENSE
OUT
SC1592M
C1
2.2μF
C2
22μFR1
100
R2
66.5
R3
53
C3
100μF
10k
.
8.0
3
2
1
typVV
V
R
R
V
REF
REFOUT
=
•
+=
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 TJA = 36.5°C/W mounted on a 1sq.
in. copper pad
allocated for adequate heat transfer. The ambient
temperature in this case should not exceed 50°C.
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 close to the input supply pin of the SC1592 to
ensure that Vin does not sag, improving load transient
response.
Output capacitor: A mi
nimum 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 electrolytic output
capacitors.
SC1592M
Rev 2.1 8
Typical Characteristics
Load Transient Response
Load Transient Response
VIN = 2.5V; VOUT = 1.8V; VCNTL = 3.3V; CIN = 22μF; COUT = 100μF
VIN = 2.5V; VOUT = 1.8V; VCNTL = 3.3V; CIN = 22μF; COUT = 100μF
Load Regulation
Dropout Voltage (Control Supply)
Droput Voltage (Input Supply)
SC1592M
Rev 2.1 9
Typical Characteristics (Cont.)
Output Voltage vs Temperature
Enable Threshold vs Temperature
Control Current vs Temperature (In Regulation)
Control Current vs Temperature (In Shutdown)
Droput Voltage vs Temperature (V
CNTL
- V
OUT
)
Droput Voltage vs Temperature (V
IN
- V
OUT
)
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2
-55 -35 -15 525 45 65 85 105 125
Output Voltage [V]
Ambient Temperature [°C]
V
CNTL
= 3.3V
V
IN
= 2.5V
I
OUT
= 10mA
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
-55 -35 -15 525 45 65 85 105 125
Enable Threshold [V]
Ambient Temperature [°C]
V
CNTL
= 3.3V
V
IN
= 2.5V
V
OUT
= 1.8V
I
OUT
= 10mA
1
10
100
-55 -35 -15 525 45 65 85 105 125
Control Current [mA]
Ambient Temperature [°C]
V
CNTL
= 3.3V
V
IN
= 2.5V
I
OUT
= 3A
I
OUT
= 2A
I
OUT
= 1A
1
10
100
1000
10000
-55 -35 -15 525 45 65 85 105 125
Control Current [nA]
Ambient Temperature [°C]
V
CNTL
= 3.3V
V
IN
= 2.5V
V
EN
= 0V
500
600
700
800
900
1000
1100
1200
1300
1400
1500
-55 -35 -15 525 45 65 85 105 125
Dropout Voltage [mV]
Ambient Temperature [°C]
INITIAL VCNTL = 3.3V
VIN = 2.5V
VOUT = 1.8V
IOUT = 3A
0
50
100
150
200
250
300
350
400
450
500
-55 -35 -15 525 45 65 85 105 125
Dropout Voltage [mV]
Ambient Temperature [°C]
VCNTL = 3.3V
INITIAL VIN = 2.5V
VOUT = 1.8V
IOUT = 3A
IOUT = 2A
SC1592M
Rev 2.1 10
Typical Characteristics (Cont.)
SC1592M
Rev 2.1 11
Outline Drawing – SOIC-8L EDP
Landing Pattern – SOIC-8L EDP
SC1592M
Rev 2.1 12
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