EZ1085
3 Amp Positive Voltage Regulator
POWER MANAGEMENT
Description
Features
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.
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
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 and the EZ1085I is adjustable only for industrial
applications.
Applications
Printer and plotter supplies
Instrumentation
Medical equipment
Microcontroller systems
Telecommunication systems
Motherboards
Switching supply post regulation
All devices are available in the popular TO-220 and
TO-263 packages.
Typical Application Circuit
Fixed Voltage Regulator
U1
3
VIN > 4.75V
+
IN
C1
10uF Tant.
EZ1085C-3.3
2
TAB
OUT
VOUT = 3.3V
+
GND
C2
10uF Tant. Min.
1
Adjustable Voltage Regulator
U1
3
VIN > 4.75V
+
C1
10uF Tant.
IN
EZ1085
TAB
OUT
2
VOUT = 3.45V
R1
133 Ohm, 1%
ADJ
+
C2
10uF Tant. Min
1
R2
232 Ohm, 1%
Notes:
(1) C1 needed if device is far from filter capacitors
(2) C2 minimum value required for stability
Revision: January 25, 2006
1
R2
VOUT = VREF • 1 +
+ I ADJ • R 2
R1
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EZ1085
POWER MANAGEMENT
Electrical Characteristics (Cont)
Unless otherwise specified: Adj. VIN = 2.75V to 7.0V and Adj. IO = 10mA to 3A; Fixed VIN = 4.75 to 7.0V and Fixed IO = 0 mA to 3A.
Values in bold apply over full operating ambient temperature range.
Parameter
Symbol
VIN
Quiescent Current
Fixed Voltage Version
IQ
5V
Temperature Coefficient
TC
0.005
Adjust Pin Current
IADJ
55
90
µA
∆IADJ
0.2
5
µA
Adjust Pin Current Change
Temperature Stability
TS
5V
Minimum Load Current
Adj Voltage Versions
IO
RA
0.5A
Typ
Max
Units
10
VN
Ripple Rejection Ratio(4)
Min
5V
RMS Output Noise(3)
IO
14
mA
%/°C
0.5
5
%
10
mA
0.003
5V
3A
60
%VO
72
dB
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) ∆VOUT, ∆VREF = 1%
(3) Bandwidth of 10 Hz to 10 kHz.
(4) 120 Hz input ripple (CADJ for ADJ = 25µF).
2006 Semtech Corp.
3
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