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SC1566I5T-1.8T

P1-P3P4-P6P7-P9P10-P12
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: April 27, 2005
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.
350mV dropout @ 3A
Adjustable output from 1.2V to 4.8V
2.5V and 1.8V options (5 pin parts also adjustable
externally using resistors)
Over current and over temperature protection
Enable pin
10µA quiescent current in shutdown
Low reverse leakage (output to input)
Full industrial temperature range
TO-220 and TO-263 packages
Battery powered systems
Motherboards and notebook computers
Peripheral cards
Network cards
Set top boxes
Medical equipment
Volts
R2
R2)(R1 1.200
VO
+
=
FeaturesDescription
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
22005 Semtech Corp. www.semtech.com
SC1566
POWER MANAGEMENT
retemaraP lobmySxaMstinU
egatloVtupnI V
NI
7V
noitapissiDrewoP P
D
detimiLyllanretnIW
tneibmAotnoitcnuJecnatsiseRlamrehT
X-362-OT
X-022-OT
θ
AJ
06
05
W/C°
esaCotnoitcnuJecnatsiseRlamrehT
X-362-OT
X-022-OT
θ
CJ
3
3
W/C°
egnaRerutarepmeTtneibmAgnitarepO T
A
58+ot04-C°
egnaRerutarepmeTnoitcnuJgnitarepO T
J
051+ot04-C°
egnaRerutarepmeTegarotS T
GTS
051+ot56-C°
.ceS01)gniredloS(erutarepmeTdaeL T
DAEL
003C°
)ledoMydoBnamuH(gnitaRDSE V
DSE
2Vk
retemaraPlobmySsnoitidnoCtseTniMpyTxaMstinU
NIV
egnaRegatloVylppuSV
NI
2.25.5 V
tnerruCtnecseiuQI
Q
V
NI
V3.3=57.0 57.1 Am
V
NI
V,V5.5=
NE
V0=01 53 Aµ
OV
egatloVtuptuO
)1(
V
O
V
NI
V=
O
I,V7.0+
O
Am01=%1-V
O
%1+V
)egatloVdexiFlanretnI(
%2-%2+
noitalugeReniL
)1(
GER
)ENIL(
V
NI
V(=
O
I,V5.5ot)V52.0+
TUO
Am01=530.0 3.0 %
noitalugeRdaoL
)1(
GER
)DAOL(
V
NI
V=
O
V7.0+2.0 4.0 %
egatloVtuoporD
)2()1(
V
D
I
O
Am01=15Vm
01
I
O
Am005=57001Vm
051
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
= 10µA 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.
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.
32005 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.
retemaraPlobmySsnoitidnoCtseTniMpyTxaMstinU
).tnoC(OV
egatloVtuoporD
)2()1(
I
O
A5.1=002003Vm
004
I
O
A3=053054Vm
006
tnerruCdaoLmuminiM
)3(
I
O
V
NI
V=
O
V7.0+101 Aµ
timiLtnerruCI
LC
0.3 5.4 5.6 A
JDA
egatloVecnerefeR
)1(
V
FER
V
NI
V,V2.2=
JDA
V=
TUO
I,
O
Am01=881.1002.1212.1V
671.1422.1
tnerruCniPtsujdA
)4(
I
JDA
V
JDA
V=
FER
01 002 An
dlohserhTniPtsujdA
)5(
V
)JDA(HT
01.0 02.0 04.0 V
NE
tnerruCniPelbanEI
NE
V
NE
V,V0=
NI
V3.3=5.1 01 Aµ
dlohserhTniPelbanEV
HI
V
NI
V3.3= 8.1 V
V
LI
V
NI
V3.3= 4.0
noitcetorPerutarepmeTrevO
levelpirThgiHT
IH
571C°
siseretsyHT
TSYH
01C°
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
= 10µA 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.
P1-P3P4-P6P7-P9P10-P12

SC1566I5T-1.8T

Mfr. #:
Buy SC1566I5T-1.8T
Manufacturer:
Semtech
Description:
LDO Voltage Regulators ULDO 3 AMP 1.8V TO-220/5L
Lifecycle:
New from this manufacturer.
Delivery:
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Payment:
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