CM3003
1.5 Amp Dual Mode Low Dropout CMOS Regulator
Features
•
•
•
•
•
•
•
•
•
•
Adjustable Output or Internally Fixed
375mV dropout at 1.5A load current
Operates from 2.2V to 5.5V input supply
Low Ground current (330µA at 1.5A Load)
Minimal output capacitance required
Current Limit Protection
Thermal Overload Protection
Reverse Voltage Protection
Thermally enhanced 8-pin SOIC package
Lead-free versions available
Product Description
The CM3003 is a family of very low dropout regulators
that offers dual mode operation. When the Adjust con-
trol pin (ADJ) is grounded, these devices automatically
enter a fixed voltage mode and deliver either a 1.8V or
2.5V output capable of supplying 1.5A, depending on
the device utilized. When the Adjust pin is connected to
an external resistor network the device automatically
operates as an adjustable regulator. The Adjust pin can
also be tied directly to the OUT pin which configures
the CM3003 as a 1.2V regulator.
An Enable control pin (EN) allows the device to be
placed in a low current mode.
Applications
•
•
•
•
•
Low Voltage "Core" processors
Graphics Cards
Gigabit NIC Cards
PC Motherboards
Notebooks
The CM3003 devices are fully protected, offering both
overload current limiting, short circuit protection and
high temperature thermal shutdown. These devices
also includes reverse voltage protection that minimizes
any reverse current flow back into the output pin.
The CM3003 devices are housed in a space saving, 8-
pin power SOIC packages which has been thermally
enhanced (integral leadframe) to ensure maximum
junction to ambient power dissipation.
The CM3003 devices are available with optional lead-
free finishing.
Typical Application Circuit
Simplified Electrical Schematic
IN
2.2V-5.5V
Controller
CM3003
2.2V - 5.5V
V
IN
10
µ
F
IN
EN
GND
OUT
ADJ
100
n
F 10
µ
F
1.8V/2.5V@1.5A
V
OUT
EN
Over Current
Short Circuit
Over Temp
1.2V Reference
Voltage
+
EN
-
GND
2.5V Output when ADJ = GND
Automatically selects Adjustable Output
(when external resistors are present)
Fixed
Adj
120K
130K
1.5 AMP
OUT
ADJ
GND
© 2004 California Micro Devices Corp. All rights reserved.
01/15/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
1
CM3003
PACKAGE / PINOUT DIAGRAM
TOP VIEW
EN
IN
OUT
ADJ
1
2
3
4
8
7
6
5
GND
GND
GND
GND
8-pin Power SOIC
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN(S)
1
2
3
NAME
EN
IN
OUT
DESCRIPTION
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.
Positive input voltage for the regulator. If this input pin is greater than 2 inches from the main input
filter, a 10µF ceramic capacitor is recommended for adequate filtering.
The regulated voltage output. An output capacitor of 10µF 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.
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 CM3003 as a 1.2V regulator.
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
4
ADJ
5-8
GND
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Ordering Part
Pins
8
8
Output Voltage
2.5
1.8
Package
SOIC-8
SOIC-8
Number
1
CM3003-25SA
CM3003-18SA
Part Marking
CM3003-25SA
CM3003-18SA
Lead-free Finish
Ordering Part
Number
1
CM3003-25SF
CM3003-18SF
Part Marking
CM3003-25SF
CM3003-18SF
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
01/15/04
CM3003
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
ESD Protection (HBM)
Pin Voltages
IN, OUT, ADJ, EN
Storage Temperature Range
Operating Temperature Range
Ambient
Junction
Power Dissipation (See note 1)
RATING
±2000
[GND - 0.4] to +6.0
-40 to +150
-40 to +85
-40 to +150
Internally Limited
UNITS
V
V
°C
°C
°C
W
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)
STANDARD OPERATING CONDITIONS
PARAMETER
V
IN
Ambient Operating Temperature Range
Load Current
C
EXT
VALUE
2.2 to 5.5
0 to +85
0 to 1500
10 +20%
UNITS
V
°C
mA
µF
© 2004 California Micro Devices Corp. All rights reserved.
01/15/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
3
CM3003
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
V
OUT
PARAMETER
Regulator Output Voltage
CM3003-25
CM3003-18
Internal Reference Voltage
Overload Current Limit
Short Circuit Current Limit
Load Regulation
Line Regulation
xx
Dropout Voltage
V
OUT
> 1.2V
V
OUT
< 0.2V
V
IN
=3.3V, 100mA < I
LOAD
< 1.5A
I
LOAD
= 5mA; 3.0V < V
IN
< to 5.0V
I
LOAD
= 100mA
I
LOAD
= 1.0A
I
LOAD
= 1.5A
Regulator Disabled (EN=GND); V
IN
=3.3V
Regulator Enabled (EN=V
IN
=3.3V); I
LOAD
= 0mA
Regulator Enabled (EN=V
IN
=3.3V); I
LOAD
= 1.5A
V
OUT
=3.3V; V
IN
= 0V
CONDITIONS
0mA < I
LOAD
< 1.5A, V
IN
=3.3V, V
ADJ
=0V
2.40
1.73
1.15
2.2
0.5
2.50
1.80
1.20
3.0
1.2
5
20
25
250
330
5
325
330
30
160
25
45
450
670
30
500
550
100
2.60
1.87
1.25
3.8
1.8
V
V
A
A
mV
mV
mV
mV
mV
µA
µA
µA
µA
°C
°C
MIN
TYP
MAX
UNITS
V
REF
I
LIM
I
SC
V
R LOAD
V
R LINE
V
DROPOUT
I
GND
Ground Current
I
ROUT
T
DISABLE
T
HYST
Output Reverse Leakage
Shutdown Temperature
Thermal Hysteresis
Enable Pin Input
V
EN_TH
I
EN
EN Input Threshold
Voltage
Enable Input Leakage
Current
Regulator Enabled
0V < V
EN
< 5.5V
0.4
0.8
0.1
1.2
5
V
µA
Adjust Pin Input (output set by external resistors)
V
ADJ_TH
I
EN
ADJ Input Threshold
Voltage
ADJ Input Leakage
Current
V
ADJ
> 1.1V
0.1
0.2
0.1
0.3
1
V
µA
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
01/15/04
CM3003
Application Information
CM3003-XX
V
IN
3.3V
IN
10
µ
F
1.5A
OUT
ADJ
GND
R2
R1
100
n
F 10
µ
F
V
OUT
EN
GND
Figure 1. Application Circuit for Adjustable Output Operation.
Output Voltage = 1.20 (R1+R2) / R2 [VOLTS]
© 2004 California Micro Devices Corp. All rights reserved.
01/15/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L
Tel: 408.263.3214
L
Fax: 408.263.7846
L
www.calmicro.com
5
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