CM3004 Datasheet, PDF (1/9 Pages) California Micro Devices Corp – 1.0 Amp Dual Mode Low-Dropout CMOS Regulator

PRELIMINARY
CM3004
1.0 Amp Dual Mode Low-Dropout CMOS Regulator
Features
• Internally fixed or adjustable output modes
• 250mV dropout at 1.0A load current
• Operates from 1.7V to 5.5V input supply
• Low Ground current (330µA at 1.0A Load)
• Minimal output capacitance required
• Stable with low ESR ceramic output capacitors
• Current limit protection
• Thermal overload protection
• Reverse current protection in shutdown
• Thermally enhanced 8-lead SOIC package
• Lead-free version available
Applications
• Low-voltage "Core" processors
• Set top boxes
• DVD players
• Personal video recorders
• Graphics Cards
• Gigabit NIC Cards
• PC Motherboards
• Notebooks
Product Description
The CM3004 is a very-low-dropout regulator that offers
both fixed output and fixed/adjustable operating
modes. When the Adjust control pin (ADJ) is grounded,
this device automatically enters a fixed voltage mode
delivering 2.5V out at 1.0A. When the Adjust pin is con-
nected to an external resistor network the device auto-
matically operates as an adjustable regulator. The
Adjust pin can also be tied directly to the OUT pin
which configures the CM3004 as a 1.2V regulator.
An Enable control pin (EN) allows the device to be
placed in a low-current mode.
The CM3004 is fully protected, offering both overload
current limiting, short-circuit protection and high-tem-
perature thermal shutdown. The CM3004 also includes
protection against output to input current flow while in
shutdown.
The CM3004 is supplied in a space-saving, 8-lead
power SOIC package which has been thermally
enhanced via an integral leadframe to ensure maxi-
mum junction-to-ambient power dissipation. The
CM3004 is also available with optional lead-free finish-
ing.
Typical Application Circuits
3.3V
V_IN
10µF
CM3004
IN
OUT
EN
ADJ
GND
2.5V/1.0A
V_OUT
100nF 10µF
GND
1.8V
V_IN
10µF
CM3004
IN
OUT
EN
ADJ
GND
1.2V/1.0A
V_OUT
100nF 10µF
Simplified Electrical Schematic
IN
1.7V-5.5V
Controller
Over Current
EN
Short Circuit
Over Temp
1.2V Reference
Voltage
+ ^EN
-
2.5V Output when ADJ = GND
Automatically selects Adjustable Output
(when external resistors are present)
Fixed
Adj
GND
1.0 AMP
OUT
ADJ
GND
© 2004 California Micro Devices Corp. All rights reserved.
01/10/05 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: [phone] ● Fax: [phone] ● www.calmicro.com 1