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www.semtech.com
EZ1587C & EZ1587I
3 Amp Positive
Voltage Regulator
POWER MANAGEMENT
Revision 1, December 2000
The EZ1587 series of high performance positive voltage
regulators are designed for use in applications requiring
low dropout performance at up to 3A. 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.
A variety of options are available for maximum flexibility:
the EZ1587C is intended for commercial applications and
has both fixed and adjustable voltage options; the
EZ1587I is intended for industrial applications and is
adjustable only.
All devices are available in the popular TO-220 and
TO-263 packages.
u
Low dropout voltage: 1.3V max. for EZ1587C and
1.4V max. for EZ1587I
u
Full current rating over line and temperature
u
Fast transient response
u
2% total output regulation over line, load and
temperature
u
Adjust pin current max 90A over temperature
u
Fixed/adjustable output voltage (EZ1587C)
u
Line regulation typically 0.015%
u
Load regulation typically 0.05%
u
Industrial temperature range (EZ1587I)
u
TO-220 and TO-263 packages
u
Printer and plotter supplies
u
Instrumentation
u
Medical equipment
u
Microcontroller systems
u
Telecommunication systems
u
Motherboards
u
Switching supply post regulation
Description
Features
Applications
Fixed Voltage Regulator
Adjustable Voltage Regulator
Typical Application Circuit
VIN > 4.75V
VOUT = 3.45V
VOUT = 3.3V
VIN > 4.75V
U1
EZ1587
1
2
3
ADJ
OUT
IN
TAB
+
C2
10uF Tant. Min.
R1
133 Ohm, 1%
+
C1
10uF Tant.
U1
EZ1587C-3.3
1
2
3
GND
OUT
IN
TAB
R2
232 Ohm, 1%
+
C1
10uF Tant.
+
C2
10uF Tant. Min
Notes:
(1) C1 needed if device is far from filter capacitors
(2) C2 minimum value required for stability
2
R
I
1
R
2
R
1
V
V
ADJ
REF
OUT
+
+
=
2
2000 Semtech Corp.
www.semtech.com
EZ1587C & EZ1587I
POWER MANAGEMENT
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Unless otherwise specified: Adj. V
IN
= 2.75V to 7.0V and Adj. I
O
= 10mA to 3A; Fixed V
IN
= 4.75 to 7.0V and Fixed I
O
= 0 mA to 3A.
Values in bold apply over full operating ambient temperature range.
Absolute Maximum Ratings
Electrical Characteristics
3
2000 Semtech Corp.
www.semtech.com
EZ1587C & EZ1587I
POWER MANAGEMENT
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NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) DV
OUT
, DV
REF
= 1%
(3) Bandwidth of 10 Hz to 10 kHz.
(4) 120 Hz input ripple (C
ADJ
for ADJ = 25F).
Electrical Characteristics (Cont)
Unless otherwise specified: Adj. V
IN
= 2.75V to 7.0V and Adj. I
O
= 10mA to 3A; Fixed V
IN
= 4.75 to 7.0V and Fixed I
O
= 0 mA to 3A.
Values in bold apply over full operating ambient temperature range.
4
2000 Semtech Corp.
www.semtech.com
EZ1587C & EZ1587I
POWER MANAGEMENT
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Notes:
(1) Where X.X denotes voltage options (EZ1587C only).
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) Where C and I denote Commercial (0C to 70C)
and Industrial (-40C to 85C) ambient temperature
ranges.
(3) Only available in tape and reel packaging. A reel
contains 800 devices.
(4) Only available in tube packaging. A tube contains 50
devices.
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Pin Configurations
Ordering Information
Pin Descriptions
Block Diagram
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