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www.semtech.com
EZ1085BC, EZ1085C
& EZ1085I
3 Amp Positive Voltage Regulator
POWER MANAGEMENT
Revision 1, December 2000
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
applications; the EZ1085BC is adjustable only for cost
sensitive commercial applications; the EZ1085I is
adjustable only for industrial applications.
All devices are available in the popular TO-220 and
TO-263 packages.
K
Low dropout voltage: 1.3V max. for EZ1085C,
1.4V max. for EZ1085I, 1.45V max. for EZ1085BC
K
Full current rating over line and temperature
K
Fast transient response
K
2% total output regulation over line, load and
temperature (2.4% for EZ1085BC)
K
Adjust pin current max 90A over temperature
K
Fixed/adjustable output voltage (EZ1085C)
K
Line regulation typically 0.015%
K
Load regulation typically 0.05%
K
Industrial temperature range (EZ1085I)
K
TO-220 and TO-263 packages
K
Printer and plotter supplies
K
Instrumentation
K
Medical equipment
K
Microcontroller systems
K
Telecommunication systems
K
Motherboards
K
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
U 1
EZ1085
1
2
3
A D J
O U T
IN
T A B
+
C 2
10uF Tant. Min.
R 1
133 Ohm, 1%
+
C 1
10uF Tant.
U 1
EZ1085C-3.3
1
2
3
G N D
O U T
IN
T A B
R 2
232 Ohm, 1%
+
C 1
10uF Tant.
+
C 2
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
+
+
=
3
2000 Semtech Corp.
www.semtech.com
EZ1085BC, EZ1085C
& EZ1085I
POWER MANAGEMENT
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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).
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.
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2000 Semtech Corp.
www.semtech.com
EZ1085BC, EZ1085C
& EZ1085I
POWER MANAGEMENT
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Notes:
(1) Where X.X denotes voltage options (EZ1085C only).
Available voltages are: 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
PDF 
ZIP
