semtech 1565
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SC1565Very Low Dropout
1.5 Amp Regulator With EnablePOWER MANAGEMENT
Revision: August 12, 2003
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/TO-263 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 SO-8, 3-lead SOT-223, 3 and
5 lead TO-220 and 3 and 5 lead TO-263 packages. Three
lead packages are available with 1.8V and 2.5V fixedoutput options only. The SO-8, TO-220-5 and TO-263-5
are available with 1.8V and 2.5V internally preset
outputs that are also adjustable using external resistors.
350mV dropout @ 1.5A
Adjustable output from 1.2V to 4.8V(1)
2.5V and 1.8V options (adjustable externallyusing 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
TO-220, TO-263, SOT-223 and SO-8 Packages
Note:
(1) SO-8, TO-220-5 and TO-263-5 packages only.
Battery powered systems
Motherboards
Peripheral cards
Network cards
Set Top Boxes
Medical Equipment
Notebook Computers
VIN
VO
ENABLE
U1
SC1565IS-X.X
1
2
3
4 5
6
7
8EN
VIN
VO
ADJ GND
GND
GND
GND
C1
C2
VIN VO
C2
C1
U1SC1565IT-X.X
1
2
3VIN
GND
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.
VIN
VO
ENABLE
U1
SC1565IS-X.X
1
2
3
4 5
6
7
8EN
VIN
VO
ADJ GND
GND
GND
GND
C1
C2
R1
R2
VoltsR2
R2)(R11.200VO
+=
VIN
ENABLE
VO
C1
C2
R1
R2
U1SC1565I5T-X.X
2
1
3
5
4VIN
EN GND ADJ
VO
Description Features
Applications
Typical Application Circuits
VoltsR2
R2)(R11.200VO
+=
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SC1565
POWER MANAGEMENT
retemaraP lobmyS xaM stinU
egatloVtupnI V NI 7 V
noitapissiDrewoP PD
detimiLyllanretnI W
tneibmAotnoitcnuJecnatsiseRlamrehT8-OS )1(
322-TOSX-022-OTX-362-OT
AJ
56360506
W/C
esaCotnoitcnuJecnatsiseRlamrehT8-OS
322-TOSX-362-OT,X-022-OT
CJ
9372
3
W/C
egnaRerutarepmeTtneibmAgnitarepO TA
58+ot04- C
egnaRerutarepmeTnoitcnuJgnitarepO TJ
051+ot04- C
egnaRerutarepmeTegarotS TGTS
051+ot56- C
.ceS01)gniredloS(erutarepmeTdaeL TDAEL
003 C
)ledoMydoBnamuH(gnitaRDSE VDSE
4 Vk
Note: (1) 1 square inch of FR-4, double sided, 1 oz. minimum copper weight.
retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU
NIV
egnaRegatloVylppuS VNI
2.2 5.5 V
tnerruCtnecseiuQ IQ
VNI
V3.3= 57.0 57.1 Am
VNI
V,V5.5=NE
V0= 01 53 A
OV
egatloVtuptuO )1( VO
VNI
V=O
I,V7.0+O
Am01= %1- VO
%1+ V
)egatloVdexiFlanretnI( %2- %2+
noitalugeReniL )1( GER)ENIL(
VNI
V(=O
I,V5.5ot)V52.0+TUO
Am01= 530.0 3.0 %
noitalugeRdaoL )1( GER)DAOL(
VNI
V=O
V7.0+ 2.0 4.0 %
egatloVtuoporD )2()1( VD
IO
Am01= 5.2 01 Vm
02
IO
Am005= 09 003 Vm
004
Absolute Maximum Ratings
Electrical CharacteristicsUnless specified: V
EN= V
IN. Adjustable Option (V
ADJ> V
TH(ADJ)): V
IN= 2.2V to 5.5V and I
O= 10A to 1.5A.
Fixed Options (VADJ
= GND): VIN
= (VO
+ 0.7V) to 5.5V and IO
= 0A to 1.5A. Values in boldapply over the full operating temperature range.
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.
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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 thisrequirement. Adjustable versions only.
(4) Guaranteed by design.
(5) When VADJ
exceeds this threshold, the Sense Select switch disconnects the internal feedback chain from
the error amplifier and connects VADJ
instead.
retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU
).tnoC(OV
egatloVtuoporD )2()1( IO
A1= 081 004 Vm
005
IO
A5.1= 072 005 Vm
006
tnerruCdaoLmuminiM )3( IO
VNI
V=O
V7.0+ 1 01 A
timiLtnerruC ILC
6.1 0.2 5.3 A
JDA
egatloVecnerefeR )1( VFER
VNI
V,V2.2=JDA
V=TUO I,
O Am01= 881.1 002.1 212.1 V
671.1 422.1
tnerruCniPtsujdA )4( IJDA
VJDA
V=FER
03 002 An
dlohserhTniPtsujdA )5( V)JDA(HT
50.0 02.0 04.0 V
NE
tnerruCniPelbanE INE
VNE
V,V0=NI
V3.3= 5.1 01 A
dlohserhTniPelbanE VHI
VNI
V3.3= 6.1 V
VLI
VNI
V3.3= 4.0
noitcetorPerutarepmeTrevO
levelpirThgiH TIH
071 C
siseretsyH TTSYH
02 C
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 1.5A.
Fixed Options (VADJ
= GND): VIN
= (VO+ 0.7V) to 5.5V and I
O= 0A to 1.5A. Values in boldapply over the full operating temperature range.
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POWER MANAGEMENT
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V. Output voltage can be
adjusted using external resistors, see Pin Descriptions
on page 5.
(2) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V. Output not adjustable.
(3) Only available in tape and reel packaging. A ree
contains 2500 devices.
(4) Only available in tape and reel packaging. A ree
contains 800 devices.
(5) Only available in tube packaging. A tube contains 50
devices.
eciveD egakcaP
RTX.X-SI5651CS )3()1( 8-OS
RTX.X-TSI5651CS )3()2( 322-TOS
RTX.X-MI5651CS )4()2( 3-362-OT
RTX.X-M5I5651CS )4()1( 5-362-OT
X.X-TI5651CS )5()2( 3-022-OT
X.X-T5I5651CS )5()1( 5-022-OT
Pin Configurations Ordering Information
SO-8
SOT-223
TO-220-3 TO-220-5
3-022-OT,322-TOS
3-362-OTdna
NIP NOITCNUF
1 NIV
2 DNG
3 OV
DNGsiBAT
5-362-OTdna5-022-OT
NIP NOITCNUF
1 NE
2 NIV
3 DNG
4 OV
5 JDA
DNGsiBAT
TO-263-3 TO-263-5
Pin Configurations (Cont.)
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*
*
Block Diagram
* Not present on SOT-223, TO-220-3 or TO-263-3
Pin Descriptions
emaNniP noitpicseDniP
JDA lanretxefI.srotsiserkcabdeeflanretniehtybtestahtotegatlovtuptuoehtstes,dednuorgnehw,nipsihT:)1egapnostiucriCnoitacilppAeeS(eblliwegatlovtuptuoeht,desuerasrotsiserkcabdeef
NE fonoitcarfaottnerructnecseiuqehtgnicuder,fforotalugerehtsnrutV4.0wolebnipsihtgnilluP.tupnIelbanE.desugniebtonfiNIVottcennoC.nepotfelsinipsihtfidelbaneeblliwecivedehT.eulavgnitareposti
DNG 022-OT,322-TOSehtnobatehtesU.gniknistaehrofecived8-OSehtnosnipruofllaesU.dnuorgecnerefeR.gniknistaehrofsecived362-OTdna
NIV muminiM.V5.5dna)V7.0+OV(neewtebebtsumnipsihtottupnieht,daollluftanoitalugerroF.egatlovtupnI .V2.2=NIV
OV .ecivedehtfotuptuorewopehtsinipehT
VoltsR2
R2)(R11.200VO
+=
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SC1565
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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
TJ(C)
VO
(V)
VIN = 3.2V
IO= 10mA
IO= 1.5A
2.450
2.460
2.470
2.480
2.490
2.500
2.5102.520
2.530
2.540
2.550
-50 -25 0 25 50 75 100 125 150
TJ(C)
VO
(V)
VIN = 5.5V
IO= 10mA
IO= 1.5A
1.175
1.180
1.185
1.190
1.195
1.200
1.2051.210
1.215
1.220
1.225
-50 -25 0 25 50 75 100 125 150
TJ(C)
VREF(V)
VIN = 2.2V
IO= 10mA
IO= 1.5A
Typical Characteristics
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
Dropout Voltage (IOUT
= 0.5A) vs. Output
Voltage vs. Junction Temperature
Dropout Voltage (IOUT
= 1.5A) vs. Output
Voltage vs. Junction Temperature
Dropout Voltage (IOUT
= 1A) vs. Output
Voltage vs. Junction Temperature
0
50
100
150
200
250
300
350
400
450
500
550
600
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
VOUT(V)
VD
(mV)
TJ= 25C
TJ= 150C
TJ= -40C
0
50
100
150
200
250
300
350
400
450
500
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
VOUT(V)
VD
(mV)
Top to bottom:TJ= 150C
TJ= 25C
TJ= -40C
0
50
100
150
200
250
300
350
400
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
VOUT(V)
VD
(mV)
Top to bottom:
TJ= 150C
TJ= 25C
TJ= -40C
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500
510
520
530
540
550
560
570
580
590
600
-50 -25 0 25 50 75 100 125 150
TJ(C)
IQ(A)
VIN = 3.3V
0
1
2
3
4
5
6
7
8
9
10
-50 -25 0 25 50 75 100 125 150
TJ(C)
IQ(OFF)(A)
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
TJ(C)
VREF(V)
VIN = 5.5V
IO= 1.5A
IO= 10mA
Reference Voltage vs. Junction
Temperature vs. Output Current
Typical Characteristics (Cont.)
Quiescent Current vs.
Junction Temperature
Off-State Quiescent Current vs.
Junction Temperature
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SC1565
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Introduction
The SC1565 is intended for applications such as
graphics cards where high current capability and very low
dropout voltage are required. It provides a very simple,
low cost solution that uses very little pcb real estate.
Additional features include an enable pin to allow for a
very low power consumption standby mode, and a fully
adjustable output.
Component Selection
Input capacitor: a 4.7F ceramic capacitor is
recommended. This allows for the device being some
distance from any bulk capacitance on the rail.
Additionally, input droop due to load transients is reduced,improving load transient response. Additional capacitance
may be added if required by the application.
Output capacitor: a minimum bulk capacitance of 2.2F,
along with a 0.1F 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 SC1565 is extremely tolerant of
output capacitor ESR values and thus will also work
comfortably with tantalum output capacitors. For refer-
ence, the phase-margin contour of Figure 1 can be used
to choose an appropriate output capacitor for a given
stability requirement.
Noise immunity: in very electrically noisy environments,
it is recommended that 0.1F ceramic capacitors be
placed from IN to GND and OUT to GND as close to the
device pins as possible.
External voltage selection resistors: the use of 1%resistors, and designing for a current flow 10A is
recommended to ensure a well regulated output (thus
R2 120k).
Applications Information
Thermal Considerations
The power dissipation in the SC1565 is approximately
equal to the product of the output current and the input
to output voltage differential:
( ) OD IVOUTVINP
The absolute worst-case dissipation is given by:
)MAX(Q)MAX()MAX(O)MIN()MAX()MAX(D IVINIVOUTVINP +=
For a typical scenario, VIN
= 3.3V 5%, VOUT
= 2.8V and
IO = 1.5A, therefore:
VIN(MAX)
= 3.465V, VOUT(MIN)
= 2.744V and IQ(MAX)
= 1.75mA
Thus PD(MAX)
= 1.09W.
Using this figure, and assuming TA(MAX)
= 70C, we can
calculate the maximum thermal impedance allowable to
maintain TJ150C:
( ) ( )R
T T
PC WTH J A MAX
J MAX A MAX
D M AX( )( )
( ) ( )
( ) .. /
=
=
= 150 70
10973 4
This should be achievable for the SO-8 package using
pcb copper area to aid in conducting the heat away, such
as one square inch of copper connected to the ground
pins of the device. The SOT-223, TO-220 and TO-263
packages would not require heatsinking. Internal ground/
power planes and air flow will also assist in removing
heat. For higher ambient temperatures it may be neces
sary to use additional copper area.
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Applications Information (Cont.)
0.001 0.01 0.1 1 10
1.5A
150mA
15mA
1.5mA
ESR(Ohms)
Load
Co=2.2uF, Phase Margin: -15-35 35-85 85-135
0.001 0.01 0.1 1 10
1.5A
150mA
15mA
1.5mA
ESR(Ohms)
Load
Co=22uF, Phase Margin: -15-35 35-85 85-135
0.001 0.01 0.1 1 101.5A
150mA
15mA
1.5mA
ESR(Ohms)
Load
Co=220uF, Phase Margin: -15-35 35-85 85-135
Figure 1: Phase-margin Contour Plot
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JEDEC REF: MS-012AA
Outline Drawing - SO-8
Land Pattern - SO-8
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Land Pattern - SOT-223
Outline Drawing - SOT-223
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Outline Drawing - T0-263-3
Minimum Land Pattern - TO-263-3
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Outline Drawing - TO-263-5
Minimum Land Pattern - TO-263-5
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Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
Contact Information
Outline Drawing - TO-220-3
Outline Drawing - TO-220-5