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.
EZ1085
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
Applications
Printer and plotter supplies
Instrumentation
Medical equipment
Microcontroller systems
Telecommunication systems
Motherboards
Switching supply post regulation
Typical Application Circuit
Fixed Voltage Regulator
U1
VIN > 4.75V
3
IN
EZ1085C-3.3
2
TAB
OUT
VOUT = 3.3V
+
C1
10uF Tant.
GND
1
+
C2
10uF Tant. Min.
Adjustable Voltage Regulator
U1
VIN > 4.75V
3
IN
TAB
EZ1085
OUT
2
VOUT = 3.45V
+
C1
10uF Tant.
ADJ
1
R1
133 Ohm, 1%
+
C2
10uF Tant. Min
Notes:
(1) C1 needed if device is far from filter capacitors
(2) C2 minimum value required for stability
R2
232 Ohm, 1%
R2
V
OUT
=
V
REF
•
1
+
+
I
ADJ
•
R 2
R1
Revision 2, May 2003
1
www.semtech.com
EZ1085
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
Parameter
Input Supply Voltage
Power Dissipation
Thermal Resistance Junction to Case
TO-220
TO-263
Thermal Resistance Junction to Ambient
TO-220
TO-263
Operating Ambient Temperature Range
EZ1085C
EZ1085I
Operating Junction Temperature Range
EZ1085C
EZ1085I
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
Symbol
V
IN
P
D
θ
J C
Maximum
7
Internally Limited
3
3
50
60
0 to 70
-40 to 85
0 to 125
-40 to 125
-65 to 150
300
2
Units
V
W
°C/W
θ
J A
°C/W
T
A
°C
T
J
T
STG
T
LEAD
ESD
°C
°C
°C
kV
Electrical Characteristics
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.
Parameter
Output Voltage
EZ1085C-X.X
Reference Voltage
(1)
(1)
Symbol
V
O
V
IN
5V
I
O
0mA
Min
0.985lV
O
l
0.98lV
O
l
Typ
V
O
Max
1.015lV
O
l
1.02lV
O
l
Units
V
V
REF
5V
10mA
1.231
1.225
1.250
1.269
1.275
V
EZ1085C, EZ1085I
Reference Voltage
Line Regulation
(1)
Load Regulation
(1)
Dropout Voltage
(1)(2)
EZ1085C, EZ1085C-X.X
EZ1085I
Current Limit
I
CL
(1)
V
RE
REG
(LINE)
REG
(LOAD)
V
D
5V
10mA
10mA
1.233
1.250
0.045
0.15
1.267
0.2
0.4
1.35
1.40
V
%
%
V
5V
3A
1.20
1.20
3.0
4.5
A
2003 Semtech Corp.
2
www.semtech.com
EZ1085
POWER MANAGEMENT
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.
Parameter
Quiescent Current
Fixed Voltage Version
Temperature Coefficient
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Minimum Load Current
Adj Voltage Versions
RMS Output Noise
(3)
Ripple Rejection Ratio
(4)
Symbol
I
Q
T
C
I
ADJ
∆I
ADJ
T
S
I
O
V
N
R
A
V
IN
5V
I
O
Min
Typ
10
0.005
55
0.2
Max
14
Units
mA
%/°C
90
5
µA
µA
%
5V
5V
0.5A
0.5
5
0.003
10
mA
%V
O
dB
5V
3A
60
72
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 = 25µF).
2003 Semtech Corp.
3
www.semtech.com
EZ1085
POWER MANAGEMENT
Pin Configurations
Ordering Information
Device
(1)(2)
EZ1085CM-X.X.TR
EZ1085IM.TR
EZ1085CT-X.X
EZ1085IT
P ackag e
TO-263
(3)
TO-220
(4)
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 (0°C to 70°C)
and Industrial (-40°C to 85°C) 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.
Pin Descriptions
Pin
1
Pin Name
ADJUST
GROUND
2
3
OUTPUT
INPUT
Pin Function
This pin is the negative side of the reference voltage for adjustable devices. Transient response
can be improved by adding a small bypass capacitor from the adjust pin to ground.
This pin is the bottom end of the internal resistor feedback chain for fixed output voltage parts, and
should be connected to ground.
This is the power output of the device and is electrically connected to the TAB.
This is the input supply pin for both the control circuitry and the pass device.
Block Diagram
2003 Semtech Corp.
4
www.semtech.com
EZ1085
POWER MANAGEMENT
Outline Drawing - TO-220
Outline Drawing - T0-263
2003 Semtech Corp.
5
www.semtech.com
京公网安备 11010802033920号
EEWORLD
