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Электронный компонент: SC1565

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2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT 1.5 AMP
REGULATOR WITH ENABLE
SC1565
October 3, 2000
1
Volts
R2
R2)
(R1
1.200
VO
+
=
FEATURES
=
350mV dropout @ 1.5A
=
Adjustable output from 1.2V to 4.8V
(1)
=
2.5V and 1.8V options (adjustable externally using
resistors)
(1)
=
Over current and over temperature protection
=
Enable pin
(1)
=
10A quiescent current in shutdown
(1)
=
Low reverse leakage (output to input)
=
Surface mount and through-hole packages
=
Full industrial temperature range
Note:
(1) SO-8 and TO-220-5L packages only.
DESCRIPTION
The SC1565 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 1.5 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 the elimination of costly heatsinks.
Additionally, the 5-lead TO-220 and SO-8 versions
have an enable pin to further reduce power dissipation
while shut down. The SC1565 provides excellent
regulation over variations in line, load and temperature.
The SC1565 is available in the popular SO-8 surface
mount package with two internally preset output voltage
options, which are also adjustable using external
resistors. Also available are 5-lead and 3-lead TO-220
2.5V options (fixed output only for the 3-lead option)
and fixed output SOT-223 options.
APPLICATIONS
=
Battery powered systems
=
Motherboards
=
Peripheral cards
=
PCMCIA cards
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
ORDERING INFORMATION
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V. Output voltage can be ad-
justed (except SOT-223 and TO-220-3) using external
resistors, see Pin Description.
(2) Only available in tape and reel packaging. A reel
contains 2500 devices.
(3) Only available in tube packaging (no suffix re-
quired).
DEVICE
(1)
PACKAGE
SC1565IS-X.X.TR
(2)
SO-8
SC1565IST-X.X.TR
(2)
SOT-223
SC1565IT-X.X
(3)
TO-220-3
SC1565I5T-X.X
(3)
TO-220-5
TYPICAL APPLICATIONS
VIN
VO
ENABLE
U1
SC1565IS-X.X
1
2
3
4
5
6
7
8
EN
VIN
VO
ADJ
GND
GND
GND
GND
C1
C2
R1
R2
VIN
VO
ENABLE
U1
SC1565IS-X.X
1
2
3
4
5
6
7
8
EN
VIN
VO
ADJ
GND
GND
GND
GND
C1
C2
VIN
VO
C2
C1
U1
SC1565IT-2.5V and SC1565IST-X.X
1
2
3
VIN
GND
VO
VIN
ENABLE
VO
C1
C2
R1
R2
U1
SC1565I5T-2.5
2
1
3
5
4
VIN
EN
GND ADJ
VO
Notes:
(1) Maximum VO setpoint for 1.8V parts = 5.4V.
(2) This device is designed to operate with ceramic input and output capacitors.
Volts
R2
R2)
(R1
1.200
VO
+
=
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT 1.5 AMP
REGULATOR WITH ENABLE
SC1565
October 3, 2000
2
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Max
Units
Input Voltage
V
IN
5.5
V
Power Dissipation
P
D
Internally Limited
W
Thermal Resistance Junction to Ambient
SO-8
(1)
SOT-223
TO-220-X
JA
65
63
50
C/W
Thermal Resistance Junction to Case
SO-8
SOT-223
TO-220-X
JC
39
27
3
C/W
Operating Ambient Temperature Range
T
A
-40 to 85
C
Operating Junction Temperature Range
T
J
-40 to 150
C
Storage Temperature Range
T
STG
-65 to 150
C
Lead Temperature (Soldering) 10 Sec.
T
LEAD
300
C
ESD Rating (Human body model)
ESD
4
kV
Note:
(1) 1 square inch of FR-4, double sided, 1 oz. minimum copper weight.
ELECTRICAL CHARACTERISTICS
Unless specified: V
EN
= V
IN
Adjustable Option (V
ADJ
> V
TH(ADJ)
): V
IN
= 2.2 to 5.5V and I
O
= 10A to 1.5A
Fixed Options (V
ADJ
= GND): V
IN
= (V
O
+ 0.7V) to 5.5V and I
O
= 0A to 1.5A
Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
VIN
Supply Voltage Range
VIN
2.2
5.5
V
Quiescent Current
I
Q
V
IN
= 3.3V
0.75
1.75
mA
V
IN
= 5.5V, V
EN
= 0V
10
35
A
VO
Output Voltage
(1)
V
O
V
IN
= V
O
+ 0.7V, I
O
= 10mA
0.99V
O
V
O
1.01V
O
V
(Internal Fixed Voltage)
0.98V
O
V
O
1.02V
O
Line Regulation
(1)
REG
(LINE)
V
IN
= (V
O
+ 0.25V) to 5.5V, I
OUT
= 10mA
0.035
0.3
%
Load Regulation
(1)
REG
(LOAD)
V
IN
= V
O
+ 0.7V
0.2
0.4
%
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT 1.5 AMP
REGULATOR WITH ENABLE
SC1565
October 3, 2000
3
ELECTRICAL CHARACTERISTICS
Unless specified: V
EN
= V
IN
Adjustable Option (V
ADJ
> V
TH(ADJ)
): V
IN
= 2.2 to 5.5V and I
O
= 10A to 1.5A
Fixed Options (V
ADJ
= GND): V
IN
= (V
O
+ 0.7V) to 5.5V and I
O
= 0A to 1.5A
Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Dropout Voltage
(2)
V
D
I
LOAD
= 10mA
2.5
10
mV
20
I
LOAD
= 500mA
115
300
mV
400
I
LOAD
= 1A
225
400
mV
500
I
LOAD
= 1.5A
350
500
mV
600
Minimum Load Current
(3)
I
O
V
IN
= V
O
+ 0.7V
1
10
A
Current Limit
I
CL
1.50
2.50
3.50
A
ADJ
Reference Voltage
(1)
V
REF
V
IN
= 2.2V, V
ADJ
= V
OUT
, I
O
= 10mA
1.188
1.200
1.212
V
1.176
1.224
Adjust Pin Current
(4)
I
ADJ
V
ADJ
= V
REF
10
50
nA
Adjust Pin Threshold
(5)
V
TH(ADJ)
0.10
0.20
0.40
V
EN
Enable Pin Current
I
EN
V
EN
= 0V, V
IN
= 3.3V
1.5
10
A
Enable Pin Threshold
V
IH
V
IN
= 3.3V
1.8
V
V
IL
V
IN
= 3.3V
0.4
OVER TEMPERATURE PROTECTION
High Trip level
T
HI
170
C
Hysteresis
T
HYST
20
C
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.
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT 1.5 AMP
REGULATOR WITH ENABLE
SC1565
October 3, 2000
4
PIN DESCRIPTIONS
Pin Name
Pin Functiom
ADJ
This pin, when grounded, sets the output voltage to that set by the internal feedback resistors. If ex-
ternal feedback resistors are used, the output voltage will be (See Application Circuit):
EN
Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a
fraction of its operating value. The device will be enabled if this pin is left open. Connect to VIN if not
being used.
GND
Reference ground. Use all four pins on the SO-8 device for heatsinking. Use the tab on the TO-220
devices for heatsinking.
VIN
Input voltage. For regulation at full load, the input to this pin must be between (VO + 0.7V) and 5.5V.
Minimum VIN = 2.2V.
VO
This pin is the power output of the device.
Volts
R2
R2)
(R1
1.200
VO
+
=
*
*
BLOCK DIAGRAM
*
Not on 3-lead TO-220
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT 1.5 AMP
REGULATOR WITH ENABLE
SC1565
October 3, 2000
5
PIN CONFIGURATIONS
SO-8
Top View
SC1565 3-PIN VERSIONS
PIN
FUNCTION
1
VIN
2
GND
3
VO
TAB IS GROUND
TO-220-3
SC1565 5-PIN VERSIONS
PIN
FUNCTION
1
EN
2
VIN
3
GND
4
VO
5
ADJ
TAB IS GROUND
TO-220-5
PIN
FUNCTION
1
VIN
2
GND
3
VO
TAB IS GROUND
SOT-223