Semtech Corporation SC1566I5M-1.8.TR, SC1566I5M-2.5.TR, SC1566I5T, SC1566I5T-1.8, SC1566I5T-2.5 Datasheet
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POWER MANAGEMENT
Description
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.
Typical Application Circuits(1)(2)
SC1566
Very Low Dropout
3.0 Amp Regulator With Enable
Features
υ350mV dropout @ 3A
υAdjustable output from 1.2V to 4.8V
υ2.5V and 1.8V options (5 pin parts also adjustable externally using resistors)
υOver current and over temperature protection
υEnable pin
υ10µA quiescent current in shutdown
υLow reverse leakage (output to input)
υFull industrial temperature range
υTO-220 and TO-263 packages
Applications
υBattery powered systems
υMotherboards and notebook computers
υPeripheral cards
υNetwork cards
υSet top boxes
υMedical equipment
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U1 |
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SC1566I5T-2.5 |
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VIN |
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VO |
5 |
VO = See equation below |
VIN |
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ENABLE |
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ADJ |
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EN GND |
R1 |
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3 |
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VO = |
1.200(R1+ R2) Volts |
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C2 |
R2 |
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R2 |
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U1 |
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1 |
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SC1566I5T-2.5 |
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VIN |
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VIN |
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VO |
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VO = 2.5V |
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4 |
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ENABLE |
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EN |
GND |
ADJ |
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C1 |
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C2 |
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U1 |
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SC1566IT-1.8 |
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VIN |
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VIN |
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VO |
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VO = 1.8V |
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GND |
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Notes: |
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C1 |
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C2 |
(1) |
Maximum VO setpoint for 1.8V parts = 5.4V |
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(2) |
This device is designed to operate with |
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ceramic input and output capacitors |
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Revision 1, January 2001 |
1 |
www.semtech.com |
SC1566
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter |
Symbol |
Max |
Units |
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Input Voltage |
VIN |
5.5 |
V |
Power Dissipation |
PD |
Internally Limited |
W |
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Thermal Resistance Junction to Ambient |
qJA |
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SC1566IM (TO-263) |
60 |
°C/W |
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SC1566IT (TO-220) |
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50 |
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Thermal Resistance Junction to Case |
qJC |
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SC1566IM (TO-263) |
3 |
°C/W |
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SC1566IT (TO-220) |
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3 |
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Operating Ambient Temperature Range |
TA |
-40 to +85 |
°C |
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Operating Junction Temperature Range |
TJ |
-40 to +150 |
°C |
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Storage Temperature Range |
TSTG |
-65 to +150 |
°C |
Lead Temperature (Soldering) 10 Sec. |
TLEAD |
300 |
°C |
ESD Rating (Human Body Model) |
VESD |
2 |
kV |
Electrical Characteristics
Unless specified: VEN = VIN. Adjustable Option (VADJ > VTH(ADJ)): VIN = 2.2V to 5.5V and IO = 10µA to 3A.
Fixed Options (VADJ = GND): VIN = (VO + 0.7V) to 5.5V and IO = 0A to 3A. Values in bold apply over the full operating temperature range.
Parameter |
Symbol |
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Test Conditions |
Min |
Typ |
Max |
Units |
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VIN |
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Supply Voltage Range |
VIN |
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2.2 |
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5.5 |
V |
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Quiescent Current |
IQ |
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VIN = 3.3V |
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0.75 |
1.75 |
mA |
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VIN = 5.5V, VEN = 0V |
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10 |
35 |
µA |
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VO |
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Output Voltage(1) |
V |
O |
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V |
IN |
= V |
O |
+ 0.7V, I = 10mA |
-1% |
V |
O |
+1% |
V |
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O |
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(Internal Fixed Voltage) |
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-2% |
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+2% |
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Line Regulation(1) |
REG |
V |
IN |
= (V |
O |
+ 0.25V) to 5.5V, I = 10mA |
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0.035 |
0.3 |
% |
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(LINE) |
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OUT |
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Load Regulation(1) |
REG |
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V |
IN |
= V |
O |
+ 0.7V |
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0.2 |
0.4 |
% |
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(LOAD) |
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Dropout Voltage(1)(2) |
V |
D |
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I = 10mA |
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1 |
5 |
mV |
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IO = 500mA |
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75 |
100 |
mV |
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150 |
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ã 2001 Semtech Corp. |
2 |
www.semtech.com |
SC1566
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VEN = VIN. Adjustable Option (VADJ > VTH(ADJ)): VIN = 2.2V to 5.5V and IO = 10µA to 3A.
Fixed Options (VADJ = GND): VIN = (VO + 0.7V) to 5.5V and IO = 0A to 3A. Values in bold apply over the full operating temperature range.
Parameter |
Symbol |
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Test Conditions |
Min |
Typ |
Max |
Units |
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VO (Cont.) |
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Dropout Voltage(1)(2) |
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I = 1.5A |
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200 |
300 |
mV |
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O |
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400 |
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IO = 3A |
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350 |
450 |
mV |
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600 |
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Minimum Load Current(3) |
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I |
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V |
IN |
= V |
O |
+ 0.7V |
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1 |
10 |
µA |
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Current Limit |
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ICL |
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3.0 |
4.5 |
6.5 |
A |
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ADJ |
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Reference Voltage(1) |
V |
REF |
V |
IN |
= 2.2V, V |
ADJ |
= V , I = 10mA |
1.188 |
1.200 |
1.212 |
V |
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OUT O |
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1.176 |
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1.224 |
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Adjust Pin Current(4) |
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I |
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V |
ADJ |
= V |
REF |
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10 |
50 |
nA |
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ADJ |
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Adjust Pin Threshold(5) |
V |
TH(ADJ) |
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0.10 |
0.20 |
0.40 |
V |
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EN |
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Enable Pin Current |
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IEN |
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VEN = 0V, VIN = 3.3V |
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1.5 |
10 |
µA |
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Enable Pin Threshold |
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VIH |
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VIN = 3.3V |
1.8 |
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V |
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VIL |
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VIN = 3.3V |
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0.4 |
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Over Temperature Protection |
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High Trip level |
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THI |
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175 |
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°C |
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Hysteresis |
THYST |
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10 |
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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 this requirement. 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.
ã 2001 Semtech Corp. |
3 |
www.semtech.com |
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