PRELIMINARY
CM3004
1.0 Amp Dual Mode Low-Dropout CMOS Regulator
Features
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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
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.
Applications
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Low-voltage "Core" processors
Set top boxes
DVD players
Personal video recorders
Graphics Cards
Gigabit NIC Cards
PC Motherboards
Notebooks
Typical Application Circuits
CM3004
V
IN
3.3V
IN
EN
GND
OUT
ADJ
2.5V/1.0A
V
OUT
Simplified Electrical Schematic
IN
1.7V-5.5V
Controller
Over Current
Short Circuit
Over Temp
10
µ
F
100
n
F 10
µ
F
EN
GND
1.2V Reference
Voltage
+
EN
CM3004
V
IN
1.8V
IN
EN
GND
OUT
ADJ
1.2V/1.0A
2.5V Output when ADJ = GND
-
V
OUT
Automatically selects Adjustable Output
(when external resistors are present)
Fixed
Adj
1.0 AMP
OUT
ADJ
10
µ
F
100
n
F 10
µ
F
GND
GND
©
2004 California Micro Devices Corp. All rights reserved.
01/10/05
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 ]
