1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
3.0 AMP LOW DROPOUT
POSITIVE VOLTAGE REGULATORS
EZ1587
November 22, 1999
1
FEATURES
Low dropout performance,
1.3V max. for EZ1587
Full current rating over line and temperature
Fast transient response
2% total output regulation over line, load
and temperature
Adjust pin current max. 90A over temperature
Fixed/adjustable output voltage
Line regulation typically 0.005%
Load regulation typically 0.05%
TO-220 or TO-263 packages
DESCRIPTION
The EZ1587 series of high performance positive
voltage regulators are designed for use in applications
requiring low dropout performance at full rated current.
Additionally, the EZ1587 series provides excellent
regulation over variations in line, load and
temperature.
Outstanding features include low dropout performance
at rated current, fast transient response, internal
current limiting and thermal shutdown protection of the
output device. The EZ1587 series are three terminal
regulators with fixed and adjustable voltage options
available in popular packages.
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
APPLICATIONS
Pentium
Processor supplies
PowerPCTM supplies
Other 1.3V to 5.7V microprocessor supplies
Low voltage logic supplies
Battery-powered circuitry
Post regulator for switching supply
Pentium Processor is a trademark of Intel Corp. PowerPC is a trademark of IBM
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum
Units
Input Supply Voltage
V
IN
7
V
Power Dissipation
P
D
Internally
Limited
W
Thermal Resistance
Junction to Case
TO-220
TO-263
JC
3
3
C/W
Thermal Resistance
Junction to Ambient
TO-220
TO-263
JA
50
60
C/W
Operating Junction
Temperature Range
T
J
0 to 125
C
Storage
Temperature Range
T
STG
-65 to 150
C
Lead Temperature
(Soldering) 10 Sec
T
LEAD
260
C
ORDERING INFORMATION
Notes:
(1) Where X.X denotes voltage options. Available
voltages are: 1.5V, 1.8V, 2.5V, 3.3V and 3.45V. Leave
blank for adjustable version (1.3 to 5.7V). Contact
factory for additional voltage options.
(2) Add suffix `TR' for tape and reel (TO-263).
DEVICE
PACKAGE
V
OUT
VOLTS
EZ1587CT-X.X
TO-220
See Note (1)
EZ1587CM-X.X
TO-263
(2)
See Note (1)
BLOCK DIAGRAM
PIN CONFIGURATIONS
1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
3.0 AMP LOW DROPOUT
POSITIVE VOLTAGE REGULATORS
EZ1587
November 22, 1999
2
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, Adj V
IN
= 2.75 to 7.0V and ADJ I
O
= 10mA to 3.0A;
Fixed (V
OUT
+1.5) to 7.0V and Fixed I
O
= 0mA to 3.0A
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2)
V
OUT
,
V
REF
= 1%
(3)
Bandwidth of 10 Hz to 10 kHz.
(4) 120 Hz input ripple, (C
ADJ
for ADJ = 25F).
(5) Over Temp. (O.T.) = over specified operating junction temperature range.
Test Conditions
Test Limits
Parameter
Symbol
V
IN
I
O
T
J
(5)
Min
Typ
Max
Units
Output Voltage
(1)
V
O
5V
10mA
25C
0.99|V
O
|
V
O
1.01|V
O
|
V
Fixed Voltage Version
O.T.
0.98|V
O
|
V
O
1.02|V
O
|
Reference Voltage
(1)
V
REF
5V
10mA
25C
1.238
1.250
1.262
V
Adj Voltage Version
O.T.
1.225
1.250
1.275
Line Regulation
(1)
REG
(LINE)
25C
0.005
0.2
%
Fixed Voltage Version
0mA
O.T.
0.035
0.2
Adj Voltage Version
10mA
Load Regulation
(1)
REG
(LOAD)
5V
25C
0.05
0.3
%
O.T.
0.2
0.4
Dropout Voltage
(2)
V
D
25C
1
V
EZ1587
O.T.
1.1
1.3
Current Limit
I
CL
O.T.
3.1
4.5
A
Quiescent Current
Fixed Voltage Version
I
Q
5V
O.T.
10
13
mA
Temperature Coefficient
T
C
O.T.
0.004
0.02
%/C
Adjust Pin Current
I
ADJ
25C
55
A
O.T.
90
Adjust Pin Current
Change
I
ADJ
O.T.
0.2
5
A
Temperature Stability
T
S
5V
0.5A
O.T.
0.5
%
Minimum Load Current
Adj Voltage Version
I
O
5V
O.T.
5
10
mA
RMS Output Noise
(3)
V
N
25C
0.003
%V
O
Ripple Rejection Ratio
(4)
R
A
5V
3.0A
O.T.
60
72
dB
1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
3.0 AMP LOW DROPOUT
POSITIVE VOLTAGE REGULATORS
EZ1587
November 22, 1999
3
TYPICAL APPLICATIONS
ADJUSTABLE VOLTAGE REGULATOR
(1)(2)
FIXED VOLTAGE REGULATOR
(1)(2)
RECOMMENDED CIRCUIT FOR THE INTEL
PENTIUM PROCESSOR - P54C-VRE
Pentium Processor is a trademark of Intel Corp.
EZ1587
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