PRELIMINARY
CM3004
1.0 Amp Dual Mode Low-Dropout CMOS Regulator
Features
Product Description
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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 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 CM3004 as a 1.2V regulator.
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
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-temperature thermal shutdown. The CM3004 also includes
protection against output to input current flow while in
shutdown.
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
The CM3004 is supplied in a space-saving, 8-lead
power SOIC package which has been thermally
enhanced via an integral leadframe to ensure maximum junction-to-ambient power dissipation. The
CM3004 is also available with optional lead-free finishing.
Typical Application Circuits
Simplified Electrical Schematic
CM3004
VIN
3.3V
10µF
IN
OUT
EN
ADJ
GND
2.5V/1.0A
VOUT
IN
1.7V-5.5V
Controller
Over Current
Short Circuit
Over Temp
100nF 10µF
EN
GND
1.2V Reference
Voltage
VIN
10µF
IN
OUT
ADJ
EN
GND
EN
-
CM3004
1.8V
+
1.2V/1.0A
2.5V Output when ADJ = GND
VOUT
Automatically selects Adjustable Output
(when external resistors are present)
1.0 AMP
Fixed
OUT
Adj
ADJ
GND
100nF 10µF
GND
© 2004 California Micro Devices Corp. All rights reserved.
01/10/05
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
1
PRELIMINARY
CM3004
PACKAGE / PINOUT DIAGRAM
TOP VIEW
EN
IN
OUT
ADJ
1
8
2
7
3
6
4
5
GND
GND
GND
GND
8-Lead Power SOIC
Note: This drawing is not to scale.
PIN DESCRIPTIONS
LEAD(S)
NAME
DESCRIPTION
1
EN
Enable/shutdown input. When EN is asserted high (VEN ≥ 1.2V), the regulator is enabled. When EN
is asserted low (VEN ≤ 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 10µF ceramic capacitor is recommended for adequate filtering.
3
OUT
The regulated voltage output. An output capacitor of 10µF is recommended to minimize any transient 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 connected 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.
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Lead-free Finish
Leads
Package
Ordering Part
Number1
Part Marking
Ordering Part
Number1
Part Marking
8
SOIC-8
CM3004-25SA
CM3004 25SA
CM3004-25SF
CM3004 25SF
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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01/10/05
PRELIMINARY
CM3004
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
ESD Protection (HBM)
Pin Voltages
IN, OUT, ADJ, EN
RATING
UNITS
± 2000
V
[GND - 0.4] to +6.0
V
-40 to +150
°C
Operating Temperature Range
Junction
-40 to +150
°C
Power Dissipation (See note 1)
Internally Limited
W
Storage Temperature Range
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 dedicated copper area. (Please consult with factory for thermal evaluation assistance)
STANDARD OPERATING CONDITIONS
PARAMETER
VALUE
UNITS
VIN
1.7 to 5.5
V
Ambient Operating Temperature Range
-40 to +85
°C
Load Current
0 to 1000
mA
CEXT
10 ± 20%
µF
© 2005 California Micro Devices Corp. All rights reserved.
01/10/05
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
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PRELIMINARY
CM3004
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
SYMBOL
VOUT
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Regulator Output Voltage
0mA < ILOAD < 1.0A, VIN=3.3V, VADJ=0V
2.40
2.50
2.60
V
0mA < ILOAD < 1.0A, VIN=1.8V, VADJ=VOUT
1.15
1.20
1.25
V
ILIM
Overload Current Limit
VIN=3.3V,VOUT = 2.5V
2.2
3.0
3.8
A
ISC
Short Circuit Current Limit
VOUT < 0.2V
0.5
1.2
1.8
A
Load Regulation
VIN=3.3V,VOUT = 2.5V, 100mA < ILOAD < 1.0A
5
20
mV
VIN=1.8V,VOUT = 1.2V, 100mA < ILOAD < 1.0A
5
20
mV
3.0V < VIN < to 5.0V, VOUT = 2.5V, ILOAD = 5mA
5
20
mV
1.7V < VIN < to 3.5V, VOUT = 1.2V, ILOAD = 5mA
5
20
mV
VR LOAD
VR LINE
Line Regulation xx
VDROPOUT
Dropout Voltage
ILOAD = 100mA
ILOAD = 1.0A
25
250
45
450
mV
mV
IGND
Ground Current
EN tied to GND, VIN=3.3V
EN=VIN=3.3V, VOUT = 2.5V, ILOAD= 0mA
EN=VIN=3.3V, VOUT = 2.5V, ILOAD= 1.0A
5
325
330
30
500
550
µA
µA
µA
IROUT
Output Reverse Leakage
VOUT=3.3V; VIN = 0V
30
100
µA
TDISABLE
THYST
Shutdown Temperature
Thermal Hysteresis
160
25
°C
°C
Enable Pin Input
VEN_TH
IEN
EN Input Threshold
Voltage
Regulator Enabled
Enable Input Leakage
Current
0V < VEN < 5.5V
0.4
0.8
1.2
V
0.1
5
µA
0.2
0.3
V
0.1
1
µA
Adjust Pin Input (output set by external resistors)
VADJ_TH
IADJ
ADJ Input Threshold
Voltage
ADJ Input Leakage
Current
0.1
VADJ > 1.1V
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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01/10/05
PRELIMINARY
CM3004
Performance Information
Typical DC Characteristics nominal conditions unless specified otherwise)
Nominal Conditions: CIN = 10µF, COUT = 10µF
2.6
Output Voltage (V)
Output Voltage (V)
1.25
1.20
1.15
1.7
1.8
2.0
2.5
3.0
3.3
2.55
2.5
2.45
2.4
3.0
3.5
4.0
Input Voltage (V)
Input Voltage (V)
Figure 1. Line Regulation, (ILOAD=5mA)
Figure 4. Line Regulation, (ILOAD=5mA)
2.6
Output Voltage (V)
Output Voltage (V)
1.2
1.25
1.15
2.55
2.5
2.45
2.4
0.0
0.5
1.0
0
0.5
Load Current (A)
Load Current (A)
Figure 2. Load Regulation (VIN = 1.8V)
3
Output Voltage (V)
1.2
Output Voltage (V)
1.0
Figure 5. Load Regulation (VIN = 3.3V)
1.4
1
0.8
0.6
0.4
0.2
0
5.0
2.5
2
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
0 0.5
1 1.5 2
2.5 3
3.5 4 4.5
5 5.5
Input Voltage (V)
Input Voltage (V)
Figure 3. Operating Voltage Range (VOUT = 1.2V)
Figure 6. Operating Voltage Range (VOUT = 2.5V)
© 2005 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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PRELIMINARY
CM3004
Performance Information (cont’d)
Typical Transient Characteristics (nominal conditions unless specified otherwise)
Nominal Conditions: CIN = 10µF, COUT = 10µF
1.0A
1.0A
IOUT
10mA
IOUT
10mA
VOUT
VOUT
VIN=3.3V, VOUT=2.5V
CIN=10µF ceramic,
COUT=10µF ceramic
VIN=1.8V, VOUT=1.2V
CIN=10µF ceramic,
COUT=10µF ceramic
Figure 7. Load Transient Step Response
IOUT=10mA,
CIN=10µF cer.,
COUT=10µF cer.
Figure 10. Load Transient Step Response
IOUT=10mA,
CIN=10µF cer.,
COUT=10µF cer.
EN=1.8V=VIN
EN=3.3V=VIN
EN=0V
EN=0V
VOUT=2.5V
VOUT=1.2V
VOUT=0V
VOUT=0V
Figure 11. Enable/Disable Response
Figure 8. Enable/Disable Response
IOUT=1.0A,
CIN=10µF cer.,
COUT=10µF cer.
IOUT=1.0A,
CIN=10µF cer.,
COUT=10µF cer.
EN=1.8V=VIN
EN=0V
EN=3.3V=VIN
EN=0V
VOUT=2.5V
VOUT=1.2V
VOUT=0V
VOUT=0V
Figure 12. Enable/Disable Response
Figure 9. Enable/Disable Response
© 2004 California Micro Devices Corp. All rights reserved.
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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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01/10/05
PRELIMINARY
CM3004
Performance Information (cont’d)
CM3004 Typical Thermal Characteristics
The overall junction to ambient thermal resistance
(θ JA) for device power dissipation (PD) consists primarily of two paths in series. The first path is the junction
to the case (θ JC) which is defined by the package
TJUNC = TAMB + PD (θ JC) + PD (θ CA)
= TAMB + PD (θ JA)
1.25
Output Voltage (V)
style, and the second path is case to ambient (θ CA)
thermal resistance which is dependent on board layout. The final operating junction temperature for any
set of conditions can be estimated by the following
thermal equation:
Tem perature vs. Output Voltage (1.2V)
The CM3004 uses a thermally enhanced package
where all the GND pins (5 through 8) are integral to the
leadframe. When this package is mounted on a double
sided printed circuit board with two square inches of
copper allocated for "heat spreading", the resulting θ JA
is about 50°C/W.
= 85°C + 50°C = 135°C
Thermal characteristics were measured using a double
sided board with two square inches of copper area
connected to the GND pins for "heat spreading". Measurement was performed under light load conditions
(5mA).
1.19
1.17
-40
25
85
Tem perature ('C)
Temperature vs. Output Voltage ( 2.5V )
2.60
Output Voltage (V)
= 85°C + 1.0W (50°C/W)
1.21
1.15
Based on a typical operating power dissipation of 1.0W
with an ambient of 85°C, the resulting junction temperature will be:
TJUNC = TAMB + PD (θ JA)
1.23
2.55
2.50
2.45
2.40
-40
-25
0
25
50
75
85
100
125
150
Tem perature ('C)
© 2005 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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PRELIMINARY
CM3004
Application Information
CM3004
VIN
3.3V
10µF
IN
OUT
EN
ADJ
GND
1.0A
VOUT
R1
100nF 10µF
R2
GND
Figure 13. Application Circuit for Adjustable Output Operation.
Output Voltage = 1.20 (R1+R2) / R2 [VOLTS]
© 2004 California Micro Devices Corp. All rights reserved.
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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
01/10/05
PRELIMINARY
CM3004
Mechanical Details
SOIC-8 Mechanical Specifications
Dimensions for the CM3004 supplied in an 8-lead
SOIC package are presented below.
Mechanical Package Diagrams
For complete information on the SOIC-8 package, see
the California Micro Devices SOIC Package Information document.
TOP VIEW
D
8
7
6
5
PACKAGE DIMENSIONS
Package
Lead
Dimensions
H
SOIC
Inches
1
Max
Min
Max
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
e
E
8
Millimeters
Min
E
Pin 1
Marking
3.80
4.19
0.150
1.27 BSC
2
3
4
SIDE VIEW
A
SEATING
PLANE
0.165
A1
B
e
0.050 BSC
H
5.80
6.20
0.228
0.244
L
0.40
1.27
0.016
0.050
# per tube
100 pieces*
# per tape
and reel
2500 pieces
END VIEW
C
Controlling dimension: inches
L
* This is an approximate number which may vary.
Package Dimensions for SOIC-8
© 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
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