2004 California Micro Devices Corp. All rights reserved.
01/10/05
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
1
CM3004
PRELIMINARY
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 (330
A 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.
Simplified Electrical Schematic
Typical Application Circuits
10
F
100
n
F
V
OUT
GND
CM3004
V
IN
3.3V
10
F
2.5V/1.0A
IN
EN
OUT
GND
ADJ
10
F
100
n
F
V
OUT
GND
CM3004
V
IN
1.8V
10
F
1.2V/1.0A
IN
EN
OUT
GND
ADJ
EN
1.2V Reference
Voltage
+
IN
GND
EN
ADJ
Over Current
Short Circuit
Over Temp
-
1.7V-5.5V
Controller
2.5V Output when ADJ = GND
OUT
Automatically selects Adjustable Output
(when external resistors are present)
Fixed
Adj
1.0 AMP
2004 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
01/10/05
CM3004
PRELIMINARY
Ordering Information
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
PIN DESCRIPTIONS
LEAD(S)
NAME
DESCRIPTION
1
EN
Enable/shutdown input. When EN is asserted high (V
EN
1.2V), the regulator is enabled. When EN
is asserted low (V
EN
0.4V), the regulator is shut down.
2
IN
Positive input voltage for the regulator. If this input pin is greater than 2 inches from the main input
filter, a 10
F ceramic capacitor is recommended for adequate filtering.
3
OUT
The regulated voltage output. An output capacitor of 10
F is recommended to minimize any tran-
sient load disturbances under normal operating conditions. Additional output capacitance can be
used to further improve transient load response.
4
ADJ
Feedback input. When ADJ is grounded, the device enters fixed voltage mode. When ADJ is con-
nected to an external resistor network, the device 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.
5-8
GND
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
PACKAGE / PINOUT DIAGRAM
Note: This drawing is not to scale.
8-Lead Power SOIC
1
2
3
4
8
7
6
5
EN
IN
OUT
ADJ
GND
GND
GND
GND
TOP VIEW
PART NUMBERING INFORMATION
Leads
Package
Standard Finish
Lead-free Finish
Ordering Part
Number
1
Part Marking
Ordering Part
Number
1
Part Marking
8
SOIC-8
CM3004-25SA
CM3004 25SA
CM3004-25SF
CM3004 25SF
2005 California Micro Devices Corp. All rights reserved.
01/10/05
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
3
CM3004
PRELIMINARY
Specifications
Note 1: The SOIC package used is thermally enhanced through the use of a fused integral leadframe. The power rating is based on
a printed circuit board heat spreading capability equivalent to 2 square inches of copper connected to the GND pins. Typical
multi-layer boards using power plane construction will provide this heat spreading ability without the need for additional ded-
icated copper area. (Please consult with factory for thermal evaluation assistance)
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
ESD Protection (HBM)
2000
V
Pin Voltages
IN, OUT, ADJ, EN
[GND - 0.4] to +6.0
V
Storage Temperature Range
-40 to +150
C
Operating Temperature Range
Junction
-40 to +150
C
Power Dissipation (See note 1)
Internally Limited
W
STANDARD OPERATING CONDITIONS
PARAMETER
VALUE
UNITS
V
IN
1.7 to 5.5
V
Ambient Operating Temperature Range
-40 to +85
C
Load Current
0 to 1000
mA
C
EXT
10
20%
F
2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
01/10/05
CM3004
PRELIMINARY
Specifications (cont'd)
Enable Pin Input
Adjust Pin Input (output set by external resistors)
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OUT
Regulator Output Voltage
0mA < I
LOAD
< 1.0A, V
IN
=3.3V, V
ADJ
=0V
2.40
2.50
2.60
V
0mA < I
LOAD
< 1.0A, V
IN
=1.8V, V
ADJ
=V
OUT
1.15
1.20
1.25
V
I
LIM
Overload Current Limit
V
IN
=3.3V,V
OUT
= 2.5V
2.2
3.0
3.8
A
I
SC
Short Circuit Current Limit
V
OUT
< 0.2V
0.5
1.2
1.8
A
V
R LOAD
Load Regulation
V
IN
=3.3V,V
OUT
= 2.5V, 100mA < I
LOAD
< 1.0A
5
20
mV
V
IN
=1.8V,V
OUT
= 1.2V, 100mA < I
LOAD
< 1.0A
5
20
mV
V
R LINE
Line Regulation
xx
3.0V < V
IN
< to 5.0V, V
OUT
= 2.5V, I
LOAD
= 5mA
5
20
mV
1.7V < V
IN
< to 3.5V, V
OUT
= 1.2V, I
LOAD
= 5mA
5
20
mV
V
DROPOUT
Dropout Voltage
I
LOAD
= 100mA
I
LOAD
= 1.0A
25
250
45
450
mV
mV
I
GND
Ground Current
EN tied to GND, V
IN
=3.3V
EN=V
IN
=3.3V, V
OUT
= 2.5V, I
LOAD
= 0mA
EN=V
IN
=3.3V, V
OUT
= 2.5V, I
LOAD
= 1.0A
5
325
330
30
500
550
A
A
A
I
ROUT
Output Reverse Leakage
V
OUT
=3.3V; V
IN
= 0V
30
100
A
T
DISABLE
T
HYST
Shutdown Temperature
Thermal Hysteresis
160
25
C
C
V
EN_TH
EN Input Threshold
Voltage
Regulator Enabled
0.4
0.8
1.2
V
I
EN
Enable Input Leakage
Current
0V < V
EN
< 5.5V
0.1
5
A
V
ADJ_TH
ADJ Input Threshold
Voltage
0.1
0.2
0.3
V
I
ADJ
ADJ Input Leakage
Current
V
ADJ
> 1.1V
0.1
1
A
2005 California Micro Devices Corp. All rights reserved.
01/10/05
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
5
CM3004
PRELIMINARY
Performance Information
Typical DC Characteristics nominal conditions unless specified otherwise)
Nominal Conditions: C
IN
= 10F, C
OUT
= 10F
Figure 1. Line Regulation, (I
LOAD
=5mA)
Figure 2. Load Regulation (V
IN
= 1.8V)
Figure 3. Operating Voltage Range (V
OUT
= 1.2V)
Figure 4. Line Regulation, (I
LOAD
=5mA)
Figure 5. Load Regulation (V
IN
= 3.3V)
Figure 6. Operating Voltage Range (V
OUT
= 2.5V)
1.15
1.20
1.25
1.7
1.8
2.0
2.5
3.0
3.3
3.5
Input Voltage (V)
O
u
t
put
V
o
l
t
a
g
e
(
V
)
1.15
1.2
1.25
0.0
0.5
1.0
Load Current (A)
O
u
t
p
u
t
Vo
l
t
a
g
e
(
V)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
O
u
t
p
u
t
Vo
l
t
a
g
e
(
V)
2.4
2.45
2.5
2.55
2.6
3.0
4.0
5.0
Input Voltage (V)
O
u
t
p
u
t
Vo
l
t
a
g
e
(
V)
2.4
2.45
2.5
2.55
2.6
0
0.5
1.0
Load Current (A)
O
u
t
p
u
t
Vo
l
t
a
g
e
(
V)
0
0.5
1
1.5
2
2.5
3
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
O
u
t
p
u
t
Vo
l
t
a
g
e
(
V)
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