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Электронный компонент: SC1566

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1
www.semtech.com
SC1566
Very Low Dropout
3.0 Amp Regulator With Enable
POWER MANAGEMENT
VIN
ENABLE
VO = See equation below
C1
C2
R1
R2
U1
SC1566I5T-2.5
1
2
3
4
5
VIN
EN
GND
ADJ
VO
VIN
ENABLE
VO = 2.5V
C1
C2
U1
SC1566I5T-2.5
1
2
3
4
5
VIN
EN
GND
ADJ
VO
VIN
VO = 1.8V
C1
C2
U1
SC1566IT-1.8
1
2
3
VIN
GND
VO
Revision 1, January 2001
The SC1566 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 3 Amps. Since it has
superior dropout characteristics compared to regular
LDOs, it can be used to supply 2.5V on motherboards or
2.8V on peripheral cards from the 3.3V supply thus
allowing heat sink size reduction or elimination.
Additionally, the five pin versions of SC1566 have an
enable pin, to further reduce power dissipation while shut
down. The SC1566 provides excellent regulation over
variations in line, load and temperature.
The SC1566 is available as three terminal fixed output
voltage and five terminal fixed or adjustable output
voltage devices with enable. Two package options are
available: TO-263 and TO-220.
u
350mV dropout @ 3A
u
Adjustable output from 1.2V to 4.8V
u
2.5V and 1.8V options (5 pin parts also adjustable
externally using resistors)
u
Over current and over temperature protection
u
Enable pin
u
10A quiescent current in shutdown
u
Low reverse leakage (output to input)
u
Full industrial temperature range
u
TO-220 and TO-263 packages
u
Battery powered systems
u
Motherboards and notebook computers
u
Peripheral cards
u
Network cards
u
Set top boxes
u
Medical equipment
Volts
R2
R2)
(R1
1.200
VO
+
=
Features
Description
Applications
Typical Application Circuits
(1)(2)
Notes:
(1) Maximum VO setpoint for 1.8V parts = 5.4V
(2) This device is designed to operate with
ceramic input and output capacitors
2
2001 Semtech Corp.
www.semtech.com
SC1566
POWER MANAGEMENT
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Absolute Maximum Ratings
Electrical Characteristics
Unless specified: V
EN
= V
IN
. Adjustable Option (V
ADJ
> V
TH(ADJ)
): V
IN
= 2.2V to 5.5V and I
O
= 10A to 3A.
Fixed Options (V
ADJ
= GND): V
IN
= (V
O
+ 0.7V) to 5.5V and I
O
= 0A to 3A. Values in bold apply over the full operating temperature range.
3
2001 Semtech Corp.
www.semtech.com
SC1566
POWER MANAGEMENT
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Defined as the input to output differential at which the output voltage drops to 1% below the value
measured at a differential of 0.7V.
(3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this
requirement. Adjustable versions only.
(4) Guaranteed by design.
(5) When V
ADJ
exceeds this threshold, the Sense Select switch disconnects the internal feedback chain from
the error amplifier and connects V
ADJ
instead.
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Electrical Characteristics (Cont.)
Unless specified: V
EN
= V
IN
. Adjustable Option (V
ADJ
> V
TH(ADJ)
): V
IN
= 2.2V to 5.5V and I
O
= 10A to 3A.
Fixed Options (V
ADJ
= GND): V
IN
= (V
O
+ 0.7V) to 5.5V and I
O
= 0A to 3A. Values in bold apply over the full operating temperature range.
4
2001 Semtech Corp.
www.semtech.com
SC1566
POWER MANAGEMENT
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Volts
R2
R2)
(R1
1.200
VO
+
=
Pin Descriptions
Pin Configurations
Note:
(1) 3-pin versions are fixed output
voltage only.
N
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P
-
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6
6
5
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Ordering Information
TO-263-5
TO-220-5
TO-263-3
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Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V.
(2) Output voltage can be adjusted using external
resistors, see Pin Descriptions below.
(3) Only available in tape and reel packaging. A reel
contains 800 devices.
(6) Only available in tube packaging. A tube contains 50
devices.
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(
Block Diagram
* 5 lead versions only
5
2001 Semtech Corp.
www.semtech.com
SC1566
POWER MANAGEMENT
Typical Characteristics
Dropout Voltage vs. Output Current
vs. Junction Temperature
Dropout Voltage vs. Junction
Temperature vs. Output Current
Output Voltage (2.5V) vs. Junction
Temperature vs. Output Current
Output Voltage (2.5V) vs. Junction
Temperature vs. Output Current
Reference Voltage vs. Junction
Temperature vs. Output Current
Reference Voltage vs. Junction
Temperature vs. Output Current
0
50
100
150
200
250
300
350
400
450
500
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I
O
(A)
V
D
(mV
)
0C
-40C
150C
25C
0
50
100
150
200
250
300
350
400
450
500
-50
-25
0
25
50
75
100
125
150
T
J
(C)
V
D
(mV
)
I
O
= 0.5A
I
O
= 1.5A
I
O
= 3A
2.450
2.460
2.470
2.480
2.490
2.500
2.510
2.520
2.530
2.540
2.550
-50
-25
0
25
50
75
100
125
150
T
J
(C)
VO
(
V
)
I
O
= 3A
I
O
= 10mA
VIN = 3.2V
2.450
2.460
2.470
2.480
2.490
2.500
2.510
2.520
2.530
2.540
2.550
-50
-25
0
25
50
75
100
125
150
T
J
(C)
VO
(
V
)
I
O
= 3A
I
O
= 10mA
VIN = 5.5V
1.175
1.180
1.185
1.190
1.195
1.200
1.205
1.210
1.215
1.220
1.225
-50
-25
0
25
50
75
100
125
150
T
J
(C)
V
REF
(V)
VIN = 2.2V
I
O
= 10mA
I
O
= 3A
1.175
1.180
1.185
1.190
1.195
1.200
1.205
1.210
1.215
1.220
1.225
-50
-25
0
25
50
75
100
125
150
T
J
(C)
V
REF
(V
)
VIN = 5.5V
I
O
= 10mA
I
O
= 3A