Low Dropout High Performance
Adjustable Positive Voltage Regulator
POWER MANAGEMENT
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 exter-
nally programmable current limit, and thermal shutdown.
Also, there is an EN input which enables or shuts down
the device.
The SC1592 voltage regulator is available in 7-lead DDPAK
and SOIC-8L EDP packages.
SC1592
Features
Wide input range, V
IN
= 1.25V to 16V,
V
CNTL
= 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
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
OUT
+1.8V Vout
R2
66.5
C3
47uF(cer)
SC1592
IN
SENSE
GND
ILIM
R1
100
+2.5V Vin
C2
10uF
EN
R3
53
V
OUT
=
(1
+
V
REF
R2
)
•
V
REF
R3
=
0.8 V typ.
TTL
Revision: November 21, 2011
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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
Power Input Voltage
Control Input Voltage
Output Current
Power Dissipation
Thermal Resistance Junction to Ambient
DDPAK (1sq. in.)
SOIC-8L EDP (1sq. in.)
Thermal Resistance Junction to Case
DDPAK
SOIC-8L EDP
Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
Symbol
V
IN
V
CNTL
I
OUT
P
D
θ
J A
Maximum
18
18
5
Internally Limited
29
36.5
3
5.5
-40 to +125
-65 to +150
300
2
Units
V
V
A
W
°C/W
θ
J C
T
J
T
STG
T
LEAD
ESD
°C/W
°C
°C
°C
kV
Electrical Characteristics
Unless specified: V
IN
= 2.5V, V
EN
= V
CNTL
= 3.3V, V
OUT
= 1.8V, I
OUT
= 10mA, R
LIM
= 100Ω, T
J
= T
A
= 25°C.
Values in
bold
indicate -40°C < T
J
< +125°C.
Parameter
Control Voltage
Reference Voltage
Control Pin Current
Symbol
V
CNTL
V
REF
I
CNTL_EN
Test Conditions
V
OUT
= V
REF
V
OUT
= V
REF
V
CNTL
= V
IN
= V
EN
= 16V
V
OUT
= V
REF
; I
O
= 0
V
CNTL
= V
IN
= V
EN
= 16V
V
OUT
= V
REF
; I
O
= 3A
Min
3
792
Typ
Max
16
Units
V
mV
mA
800
3
24
1
0.01
0.1
0.8
1.4
160
260
808
8
Control Pin Current in
Shutdown
V
IN
Line Regulation
V
CNTL
Line Regulation
Load Regulation
(1)
I
CNTL_DIS
REG
(LINE)
REG
(CNTL)
REG
(LOAD)
V
CNTL
= V
IN
= 16V
V
EN
= 0
2.5V
≤
V
IN
≤
16V
3.3V
≤
V
CNTL
≤
16V,
V
OUT
= V
REF
10mA
≤
I
OUT
≤
2A, T
J
= 25°C
10mA
≤
I
OUT
≤
3A, -40 < T
J
< 125°C
5
0.1
0.4
1.5
3
320
520
μ
A
%/V
%/V
%
%
mV
Dropout Voltage
V
DO
I
OUT
= 2A; V
OUT
= 0.98 Vnom
I
OUT
= 3A; V
OUT
= 0.98 Vnom
©
2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: V
IN
= 2.5V, V
EN
= V
CNTL
= 3.3V, V
OUT
= 1.8V, I
OUT
= 10mA, R
LIM
= 100Ω, T
J
= T
A
= 25°C.
Values in
bold
indicate -40°C < T
J
< +125°C.
Parameter
Thermal Shutdown
Thermal Shutdown
Hysteresis
SENSE Input Current
Low Level EN
High Level EN
EN Input Current
EN Impedance
Current Limit Accuracy
(2)
Symbol
T
SHUT
Test Conditions
Min
Typ
150
10
1
Max
Units
°C
°C
μ
A
0.8
2
V
EN
= V
CNTL
= 5V
55
65
I
LIM
-20
+20
100
V
V
μ
A
KΩ
%
Notes:
(1) For load regulation use a 1ms current pulse width, d.c.
≤
10% when measuring VOUT.
(2) Current limit is programmable,
I
LIM
≈
240
•
V
OUT
R
LIM
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2011 Semtech Corporation
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SC1592
POWER MANAGEMENT
Pin Configurations
Top View
TAB
Pin Function
1
2
3
4
5
6
7
TAB
ILIM
IN
CNTL
GND
OUT
SENSE
EN
GND
Ordering Information
Part Number
SC1592IMTR
SC1592IMTRT
(3)
SC1592ISTR
SC1592ISTRT
(3)
SC1592EVB
(2)
Evaluation Board
SOIC-8L EDP
P ackag e
(1)
Temp. Range (T
J
)
-40°C to +125°C
TO-263-7L
(TO-263-7L DDPAK)
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 pack-
age needed (TO-263(DDPAK) or SOIC(EDP)).
(3) Lead free product.
Top View
ILIM
IN
IN
CNTL
1
2
3
4
8
7
6
5
EN
SENSE
OUT
OUT
Bottom View
EN
SENSE
OUT
OUT
8
7
6
5
Exposed
Die Pad
GND
ILIM
IN
IN
CNTL
1
2
3
4
(SOIC-8L EDP)
(SOIC-8L EDP)
Pin Descriptions
Pin #
DDPAK
1
2
3
Pin #
SOIC
1
2, 3
4
Pin Name
ILIM
IN
CNTL
Pin Function
Externally programmable current limit should be set at < 5A.
This is the collector input to the power device. The ouput load current is supplied
through this pin.
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
V
CNTL_MIN.
Ground.
This is the power output of the device.
This is a feedback input.
Enable input. When high, should be less or equal to V
CNTL.
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4, TAB
5
6
7
PAD
5, 6
7
8
GND
OUT
SENSE
EN
©
2011 Semtech Corporation
SC1592
POWER MANAGEMENT
Block Diagram
Figure 1
⎡
V
⎤
R
LIM
≈
240 X
⎢
OUT
⎥
⎣
I
LIM
⎦
I
LIM
= Selected current limit value
V
OUT
= Regulated output voltage
R
LIM
= 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 V
IN
, it’s recommended that a 10-20k
resistor should be inserted in the link between EN and V
IN
.
©
2011 Semtech Corporation
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