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EZ1085_06 Datasheet, PDF (1/6 Pages) Semtech Corporation – 3 Amp Positive Voltage Regulator
EZ1085
3 Amp Positive Voltage Regulator
POWER MANAGEMENT
Description
The EZ1085 series of high performance positive voltage
regulators are designed for use in applications requiring
low dropout performance at up to 3A. Additionally, the
EZ1085 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 EZ1085C has both fixed and adjustable voltage
options and is designed for use in commercial applica-
tions and the EZ1085I is adjustable only for industrial
applications.
All devices are available in the popular TO-220 and
TO-263 packages.
Typical Application Circuit
Features
‹ Low dropout voltage: 1.3V max. for EZ1085C,
1.4V max. for EZ1085I
‹ Full current rating over line and temperature
‹ Fast transient response
‹ ±2% total output regulation over line, load and
temperature
‹ Adjust pin current max 90µA over temperature
‹ Fixed/adjustable output voltage (EZ1085C)
‹ Line regulation typically 0.015%
‹ Load regulation typically 0.05%
‹ Industrial temperature range (EZ1085I)
‹ TO-220 and TO-263 packages. Available in RoHS
compliant package
Applications
‹ Printer and plotter supplies
‹ Instrumentation
‹ Medical equipment
‹ Microcontroller systems
‹ Telecommunication systems
‹ Motherboards
‹ Switching supply post regulation
Fixed Voltage Regulator
VIN > 4.75V
U1
3 IN
EZ1085C-3.3
TAB OUT 2
VOUT = 3.3V
+ C1
10uF Tant.
GND
1
+ C2
10uF Tant. Min.
Adjustable Voltage Regulator
VIN > 4.75V
U1
3
IN
EZ1085
TAB
2
OUT
+ C1
10uF Tant.
ADJ
1
Notes:
(1) C1 needed if device is far from filter capacitors
(2) C2 minimum value required for stability
VOUT = 3.45V
R1
133 Ohm, 1%
+ C2
10uF Tant. Min
R2
232 Ohm, 1%
VOUT
= VREF
•
1 +

R2
R1


+
IADJ
• R2
Revision: January 25, 2006
1
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