CM3065 Datasheet, PDF (1/6 Pages) California Micro Devices Corp – 2.0 Amp Tri-Mode Low Dropout CMOS Regulator

PRELIMINARY
CM3065
2.0 Amp Tri-Mode Low Dropout CMOS Regulator
Features
• 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
Applications
• Low voltage "Core" processors
• Graphics cards
• Gigabit NIC cards
• PC motherboards
• Notebook computers
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.
Typical Application Circuit
Simplified Electrical Schematic
(See notes below for TO-263 devices.)
3.3V
V_IN
10µF
GND
CM3065-xxSA/SF
IN OUT
EN ADJ
GND
R2
2.0A
R1
100nF 10µF
V_OUT
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.
IN
2.2V-5.5V
Controller
EN
(Note 1)
Over Current
Short Circuit
Over Temp
+
1.2V Reference
Voltage
-
Fixed Output when ADJ = GND
Automatically selects Adjustable Output
(when external resistors are present)
GND
EN
Fixed
Adj
130K
120K
2..0 AMP
OUT
ADJ
(Note 2)
© 2004 California Micro Devices Corp. All rights reserved.
08/16/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: [phone] ● Fax: [phone] ● www.calmicro.com 1