EZ1085BC, EZ1085C
& EZ1085I
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.
u Low dropout voltage: 1.3V max. for EZ1085C,
1.4V max. for EZ1085I, 1.45V max. for EZ1085BC
u Full current rating over line and temperature
u Fast transient response
u ±2% total output regulation over line, load and
temperature (±2.4% for EZ1085BC)
Outstanding features include low dropout performance
at rated current, fast transient response, internal
current limiting and thermal shutdown protection of the
output device.
u Adjust pin current max 90µA over temperature
u Fixed/adjustable output voltage (EZ1085C)
u Line regulation typically 0.015%
u Load regulation typically 0.05%
u Industrial temperature range (EZ1085I)
u TO-220 and TO-263 packages
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.
Applications
u Printer and plotter supplies
u Instrumentation
u Medical equipment
All devices are available in the popular TO-220 and
TO-263 packages.
u Microcontroller systems
u Telecommunication systems
u Motherboards
u Switching supply post regulation
Typical Application Circuit
Fixed Voltage Regulator
U1
EZ1085C-3.3
3
2
TAB
VIN > 4.75V
VOUT = 3.3V
IN
OUT
+
+
C1
10uF Tant.
C2
GND
1
10uF Tant. Min.
Adjustable Voltage Regulator
U1
IN
EZ1085
OUT
3
2
TAB
VIN > 4.75V
VOUT = 3.45V
+
+
C1
R1
C2
10uF Tant.
ADJ
1
133 Ohm, 1%
10uF Tant. Min
R2
232 Ohm, 1%
R2
R1
VOUT = VREF • 1+
+ IADJ • R2
Notes:
(1) C1 needed if device is far from filter capacitors
(2) C2 minimum value required for stability
Revision 1, December 2000
1
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