SC1592
Low Dropout High Performance
Adjustable Positive Voltage Regulator
POWER MANAGEMENT
Description
Features
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.
Wide input range, VIN = 1.25V to 16V,
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.
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 and thermal
shutdown
Fast transient response
Excellent line and load regulation
Power SO-8 and 7-lead DDPAK
Applications
The SC1592 voltage regulator is available in 7-lead DDPAK
and SOIC-8L EDP packages.
Low voltage logic supplies
Microprocessor and chipset supplies
Split plane microprocessor supplies
Advanced graphics cards supplies
Sound cards and auxiliary power supplies
SMPS post regulator
Typical Application Circuit
+3.3V Vcntl
CNTL
C1
1uF
+1.8V Vout
OUT
R2
66.5
SC1592
C3
47uF(cer)
+2.5V Vin
IN
C2
10uF
EN
SENSE
GND
R3
53
R2
) • VREF
R3
= 0.8 V typ.
VOUT = (1 +
VREF
R1
100
TTL
Revision: November 21, 2011
ILIM
1
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SC1592
POWER MANAGEMENT
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
DDPAK (1sq. in.)
SOIC-8L EDP (1sq. in.)
θJ A
29
36.5
°C/W
Thermal Resistance Junction to Case
DDPAK
SOIC-8L EDP
θJ C
3
5.5
°C/W
Junction Temperature Range
TJ
-40 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 specified: VIN = 2.5V, VEN = VCNTL = 3.3V, VOUT = 1.8V, IOUT = 10mA, RLIM = 100Ω, TJ = TA = 25°C.
Values in bold indicate -40°C < TJ < +125°C.
Parameter
Symbol
Test Conditions
Min
Control Voltage
VCNTL
VOUT = VREF
3
Reference Voltage
VREF
VOUT = VREF
792
Control Pin Current
ICNTL_EN
Max
Units
16
V
800
808
mV
VCNTL = VIN = VEN = 16V
VOUT = VREF; IO = 0
3
8
VCNTL = VIN = VEN = 16V
VOUT = VREF; IO = 3A
24
ICNTL_DIS
VCNTL = VIN = 16V
V EN = 0
1
5
μA
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, -40 < TJ < 125°C
1.4
3
%
IOUT = 2A; VOUT = 0.98 Vnom
160
320
mV
IOUT = 3A; VOUT = 0.98 Vnom
260
520
Control Pin Current in
Shutdown
Dropout Voltage
© 2011 Semtech Corporation
V DO
2
Typ
mA
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SC1592
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VIN = 2.5V, VEN = VCNTL = 3.3V, VOUT = 1.8V, IOUT = 10mA, RLIM = 100Ω, TJ = TA = 25°C.
Values in bold indicate -40°C < TJ < +125°C.
Parameter
Thermal Shutdown
Symbol
Test Conditions
Min
TSHUT
Thermal Shutdown
Hysteresis
SENSE Input Current
Typ
°C
10
°C
1
μA
0.8
High Level EN
VEN = VCNTL = 5V
55
EN Impedance
100
65
ILIM
-20
V
V
2
EN Input Current
Units
150
Low Level EN
Current Limit Accuracy(2)
Max
μA
KΩ
+20
%
Notes:
(1) For load regulation use a 1ms current pulse width, d.c. ≤ 10% when measuring VOUT.
(2) Current limit is programmable, ILIM ≈
© 2011 Semtech Corporation
240 • VOUT
RLIM
3
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SC1592
POWER MANAGEMENT
Pin Configurations
Ordering Information
Top View
TAB
Pin Function
(1)
Part Number
P ackag e
SC1592IMTR
TO-263-7L
1
ILIM
SC1592IMTRT(3)
2
IN
SC1592ISTR
3
CNTL
SC1592ISTRT(3)
4
GND
5
OUT
6
SENSE
7
EN
TAB
GND
Temp. Range (TJ)
-40°C to +125°C
SOIC-8L EDP
SC1592EVB(2)
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel
contains 800 devices for TO-263 package and 2500
devices for SOIC package.
(2) When ordering Evaluation Board please specify package needed (TO-263(DDPAK) or SOIC(EDP)).
(3) Lead free product.
(TO-263-7L DDPAK)
Top View
Bottom View
ILIM
1
8
EN
IN
2
7
SENSE
IN
3
6
CNTL
4
5
EN
8
SENSE
7
OUT
OUT
6
OUT
OUT
5
(SOIC-8L EDP)
Exposed
Die Pad
GND
1
ILIM
2
IN
3
IN
4
CNTL
(SOIC-8L EDP)
Pin Descriptions
Pin #
DDPAK
Pin #
SOIC
Pin Name
1
1
ILIM
2
2, 3
IN
This is the collector input to the power device. The ouput load current is supplied
through this pin.
3
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.
4, TAB
PAD
GND
Ground.
5
5, 6
OUT
This is the power output of the device.
6
7
SENSE
7
8
EN
© 2011 Semtech Corporation
Pin Function
Externally programmable current limit should be set at < 5A.
This is a feedback input.
Enable input. When high, should be less or equal to VCNTL.
4
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SC1592
POWER MANAGEMENT
Block Diagram
Figure 1
⎡V ⎤
RLIM ≈ 240 X ⎢ OUT ⎥
⎣ ILIM ⎦
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.
© 2011 Semtech Corporation
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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 VIN and VCNTL up to 16V, providing
there is adequate thermal management.
CNTL
C1
2.2uF
SC1592
IN
C2
22uF
R2
66.5
10k
EN
C3
100uF
SENSE
GND
ILIM
R3
53
R2
) • VREF
R3
= 0.8 V typ.
R1
100
VOUT = (1 +
VREF
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 mount on the
1sq.in. copper pad allocated for adequate heat transfer.
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:
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 TJA = 29°C/W mount
on the same size copper pad.
240 • VOUT
RLIM
where ILIM = selected current limit value
VOUT = regulated output voltage
RLIM = programmable current limit resistor
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.
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.
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.
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
then 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.
© 2011 Semtech Corporation
OUT
+2.5V Vin
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, 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 then
300mV.
ILIM ≈
+1.8V Vout
+3.3V Vcntl
6
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SC1592
POWER MANAGEMENT
Typical Characteristics
Load Transient Reponse
V OUT
20mV/div
V IN
= 2.5V
V OUT = 1.8V
V CNTL = 3.3V
VIN
CIN
= 22uF
Iout
COUT = 100uF
I st ep : 1 5 mA t o 3 A
sl ew r at e: 2 . 5 A / uS
Time (2ms/div)
V OUT
20mV/div
V IN
V OUT = 1.8V
V CNTL = 3.3V
VIN
CIN
Iout
= 2.5V
= 22uF
COUT = 100uF
I st ep : 1 5 mA t o 3 A
slew r at e: 2 .5 A / uS
Time (200us/div)
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Typical Characteristics (Cont.)
Load Regulation
2.00
VCNTL = 3.3V
VIN = 2.5V
1.95
OUTPUT VOLTAGE(V)
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (A)
Output Voltage
vs. Tem perature
2
VCNTL = 3.3V
VIN = 2.5V
IOUT = 10mA
1.95
OUTPUT VOLTAGE (V)
1.9
1.85
1.8
1.75
1.7
1.65
1.6
1.55
1.5
-40
-20
0
20
40
60
80
100
120
TEMPERATURE ( C)
o
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SC1592
POWER MANAGEMENT
Typical Characteristics (Cont.)
EnableThreshold
vs. Tem perature
2
VCNTL = 3.3V
VIN = 2.5V
VOUT = 1.8V
IOUT = 10mA
OUTPUT VOLTAGE (V)
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
-40
-20
0
20
40
60
80
100
120
TEMPERATURE ( C)
o
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Typical Characteristics (Cont.)
Dropout Voltage
(Control Supply)
DROPOUT VOLTAGE (V)
1.1
INITIAL VCNTL = 3.3V
VIN = 2.5V
VOUT = 1.8V
1.0
0.9
0.8
0
1
2
3
OUTPUT CURRENT (A)
Dropout Voltage
(Input Supply)
DROPOUT VOLTAGE (V)
0.50
VCNTL = 3.3V
INITIAL VIN = 2.5V
VOUT = 1.8V
0.40
0.30
0.20
0.10
0.00
0
1
2
3
OUTPUT CURRENT (A)
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Typical Characteristics (Cont.)
Contol Current
vs. Tem perature
(In Shutdow n)
CONTROL CURRENT (nA)
10000
1000
100
V CNTL = 3.3V
V IN = 2.5V
V EN = 0V
I OUT = 10mA
10
1
-40
-20
0
20
40
60
80
100
120
TEMPERATURE ( oC)
Control Current
vs Tem perature
(In Regulation)
CONTROL CURRENT (mA)
100
IOUT = 3A
IOUT = 2A
10
IOUT = 1A
1
-40
V CNTL = 3.3V
V IN = 2.5V
-20
0
20
40
60
80
100
120
TEMPERATURE ( C)
o
© 2011 Semtech Corporation
11
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SC1592
POWER MANAGEMENT
Typical Characteristics (Cont.)
Dropout Voltage
vs. Tem perature
(V CNTL - V OUT)
DROPOUT VOLTAGE (mV)
1500
1400
INITIAL VCNTL = 3.3V
1300
VIN = 2.5V
VOUT = 1.8v
IOUT = 3A
1200
1100
1000
900
800
700
600
500
-40
10
60
110
TEMPERATURE ( oC)
Dropout Voltage
vs. Tem perature
(V IN - V OUT)
500
DROPOUT VOLTAGE (mV)
450
400
IOUT = 3A
350
300
250
200
150
100
VCNTL = 3.3V
IOUT = 2A
INITIAL VIN = 2.5V
50
0
-40
VOUT = 1.8v
-20
0
20
40
60
80
100
120
TEMPERATURE ( C)
o
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SC1592
POWER MANAGEMENT
Typical Characteristics (Cont.)
47uF ESR vs. Iout
10
Unstable
Area
ESR (Ohm)
1
0.1
Stable
Area
0.01
0.001
0
0.5
1
1.5
2
OUTPUT CURRENT (A)
2.5
3
150uF ESR vs. Iout
10
Unstable
Area
ESR (Ohm)
1
0.1
Stable
Area
0.01
0.001
0
0.5
1
1.5
2
OUTPUT CURRENT (A)
2.5
3
330uF ESR vs. Iout
10
Unstable
Area
ESR (Ohm)
1
0.1
Stable
Area
0.01
0.001
0
0.5
1
1.5
2
2.5
3
OUTPUT CURRENT (A)
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Evaluation Board Schematic
+3.3V Vcntl
+1.8V Vout
CNTL
OUT
U1
SC1592
C1
2.2uF
R2
66.5
+2.5V Vin
IN
R opt
10k
C2
22uF
(cer)
C3
100uF
(cer)
SENSE
EN
GND
ILIM
R3
53
R1
100
R2
) • VREF
R3
= 0.8 V typ.
VOUT = (1 +
VREF
Evaluation Board Schematic - Bill of Material
R ef
Qty
Reference
1
1
C1
2.2uF, 16V, Ceramic, 1206
Murata or similar
2
1
C2
22uF, 10V, Ceramic, 1210
Murata or similar
3
1
C3
100uF, 6.3V, Ceramic, 1812
Murata or similar
4
1
R1
100, ±5%, 0805
Any
5
1
R2
66.5, ±0.5%, 0805
Any
6
1
R3
53, ±0.5%, 0805
Any
7
1
Ropt
10K, ±10%, 0805
Any
8
1
U1
S C 1592
Semtech Corp.
© 2011 Semtech Corporation
Part Number/Value
14
Manufacturer
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SC1592
POWER MANAGEMENT
Evaluation Board - SOIC-8 EDP
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Evaluation Board - TO-263-7L (DDPAK)
© 2011 Semtech Corporation
16
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SC1592
POWER MANAGEMENT
Outline Drawing - SOIC-8L EDP
A
D
e
DIMENSIONS
MILLIMETERS
MIN NOM MAX
DIM
N
E1 E
1
2
ccc C
2X N/2 TIPS
e/2
B
D
aaa C
A2 A
SEATING
PLANE
C
1.35
1.75
0.00
0.13
1.25
1.65
0.31
0.51
0.17
0.25
4.80 4.90 5.00
3.80 3.90 4.00
6.00 BSC
1.27 BSC
3.30
2.41
0.25
0.50
0.40 0.72 1.04
(1.05)
8
8°
0°
0.10
0.25
0.20
A
A1
A2
b
c
D
E1
E
e
F
H
h
L
L1
N
01
aaa
bbb
ccc
E/2
A1
bxN
bbb
C A-B D
h
(F)
EXPOSED PAD
h
H
(H)
c
GAUGE
PLANE
L
(L1)
0.25
SEE DETAIL
DETAIL
A
01
A
SIDE VIEW
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H- .
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
4. THE MEASUREMENT OF DIMENSION "F" DOES NOT INCLUDE EXPOSED TIE BAR.
Land Pattern - SOIC-8L EDP
E
SOLDER
MASK
D
(C)
F
G
Z
Y
THERMAL VIA
Ø 0.36mm
P
X
DIMENSIONS
DIM MILLIMETERS
(5.30)
C
D
3.50
5.10
E
F
2.60
G
3.20
P
1.27
X
0.60
Y
2.10
7.40
Z
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. THIS LAND PATTERN IS FOR REFERENCE PURPOSE ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
3. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE
CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY
COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF
THE DEVICE.
4. REFERENCE IPC-SM-782A, SECTION 9.1, RLP NO. 300A.
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Outline Drawing - TO-263-7L (DDPAK)
E
A
E/2
0
DIM
L1
A
A1
b
c
c1
D
D1
E
E1
H
e
L
L1
N
0
01
aaa
D
H
1 2 3 4 5 6 7
e
bXN
aaa
B A
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
.190
.010
.036
.029
.065
.380
.420
.625
.050 BSC
.070
.110
.066
7
15°
0°
8°
.010
.160
.000
.020
.015
.045
.326
.270
.380
.245
.575
4.06
4.83
0.00
0.25
0.51
0.91
0.38
0.74
1.65
1.14
8.28
9.65
6.86
9.65
10.67
6.22
14.61
15.88
1.27 BSC
1.78
2.79
1.68
7
15°
0°
8°
0.25
A
SEATING
PLANE
A1
B
c1
SIDE VIEW
SEE DETAIL
PLATED COPPER
HEAT SPREADER
A
D1
(L1)
c
E1
L
DETAIL
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES).
2.
DIMENSIONS "D" AND "E" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
01
A
Recommended Land Pattern - TO-263-7L (DDPAK)
H
DIM
K
DIMENSIONS
INCHES
MILLIMETERS
G
H
K
P
X
Y
Z
.125
.420
.360
.050
.038
.140
.625
3.18
10.67
9.14
1.27
0.97
3.56
15.88
Z
G
Y
P
X
NOTES:
1. CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES).
2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
© 2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
© Semtech 2011
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reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights.
Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse,
neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited
to, exposure to parameters beyond the specifi ed maximum ratings or operation outside the specified range.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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