PRELIMINARY
CM3065
2.0 Amp Tri-Mode Low Dropout CMOS Regulator
Features
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Operates as an adjustable output or a fixed output
regulator with 2 output voltage options
1.8V or 2.5V fixed output voltage versions
360mV dropout at 2.0A load current
Operates from 2.2V to 5.5V input supply
Low Ground current (350µA at 2.0A Load)
Stable with low ESR ceramic output capacitor
Current limit protection
Thermal overload protection
Reverse voltage protection
Thermally enhanced 8-lead SOIC or 3-lead TO-
263 package
Lead-free versions available
Product Description
The CM3065 family of very low dropout regulators
offers both fixed/adjustable-output and fixed-output
operation capable of delivering up to 2A of current. The
CM3065 devices are fully protected, offering overload
current limiting, short circuit protection, high tempera-
ture thermal shutdown, and reverse voltage protection
to minimize reverse current flow into the output pin.
The CM3065-xxSA/SF (8-lead, SOIC packaged)
devices operate in either adjustable or fixed output
modes. When the ADJ input is grounded, the regulator
operates as a fixed output voltage device at the speci-
fied output voltage. When the ADJ input is connected
to an external resistor network the device operates as
an adjustable regulator. The ADJ input can also be tied
directly to the OUT pin which configures the CM3065
as a 1.2V regulator. The CM3065-xxSA/SF devices
feature an Enable control input (EN), which when set
low, disables the device to a low quiescent current
mode.
The CM3065-xxTO/TN (TO-263 packaged) versions
operate as higher power, fixed output voltage devices
and are available with 1.8V or 2.5V outputs voltages
only.
The CM3065 is available in a space saving, 8-lead
power SOIC which has been thermally enhanced with
an integral leadframe to ensure maximum junction to
ambient power dissipation, or a 3-lead TO-263 pack-
age. Both packages are offered with optional lead-free
finishing.
Applications
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Low voltage "Core" processors
Graphics cards
Gigabit NIC cards
PC motherboards
Notebook computers
Typical Application Circuit
CM3065-xxSA/SF
Simplified Electrical Schematic
(See notes below for TO-263 devices.)
2.2V-5.5V
Controller
Over Current
Short Circuit
Over Temp
IN
V
IN
3.3V
IN
EN
OUT
ADJ
GND
R2
R1
2.0A
V
OUT
EN
(Note 1)
10
µ
F
100
n
F 10
µ
F
1.2V Reference
Voltage
+
EN
GND
Fixed Output when ADJ = GND
Automatically selects Adjustable Output
(when external resistors are present)
-
Fixed
Adj
120K
130K
2..0 AMP
OUT
ADJ
(Note 2)
Note 1: EN pin is internally tied to V
IN
on CM3065-xxTO/TN devices
Note 2: ADJ pin is internally tied to GND on CM3065-xxTO/TN devices.
©
2004 California Micro Devices Corp. All rights reserved.
08/16/04
GND
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
