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PDF CM3015 Data sheet ( Hoja de datos )
| Número de pieza | CM3015 | |
| Descripción | Micropower 300mA Low Dropout CMOS Regulator | |
| Fabricantes | California Micro Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CM3015 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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PRELIMINARY
CM3015www.DataSheet4U.com
Micropower, 300mA Low Dropout CMOS Regulator
Features
• 300mA output current capability
•300mA peak in SOT-23 package
•300mA continuous in MSOP package
• 300mV maximum dropout voltage at full load
• Excellent line and load regulation
• Stable with any output capacitor
• Ultra low noise with optional bypass capacitor
• Fast power-up with bypass capacitor
• "Zero" current in Shutdown mode
• Thermal overload protection
• Foldback current limiting protection
• Reverse current protection
Applications
• Notebook and palmtop computers
• Cell phones and battery powered devices
• Consumer and personal electronics
• PC Card VCC and VPP regulation and switching
CM3015 Regulator Family
PRODUCT
CM3015-00
CM3015-12
CM3015-15
CM3015-18
CM3015-25
CM3015-28
CM3015-30
CM3015-33
OUTPUT VOLTAGE*
Adjustable
1.2V
1.5V
1.8V
2.5V
2.8V
3.0V
3.3V
* For other output voltages, please consult factory.
Product Description
The CM3015 is a CMOS linear voltage regulator with
low quiescent current, very low dropout voltage and
better than 1% fixed output voltage accuracy. The
CM3015 ground current is typically 150µA at light loads
and only 165µA at 300mA.
Load regulation of 0.25% is maintained for peak cur-
rents up to 300mA. This is useful for supplying in-rush
currents during power-up and transient conditions. The
continuous output current is determined by power dis-
sipation, package type and board layout.
A dedicated control input (EN, Active High) has been
included for power-up sequencing flexibility. When this
input is taken low, the regulator is disabled and the
supply current will drop to near zero.
The CM3015 also features reverse current protection.
This protects the device by blocking the pass transis-
tor’s parasitic diode when the output voltage is forced
higher than the input. The device also incorporates
overload current limiting and high temperature thermal
shutdown protection.
For low noise performance and increased power sup-
ply ripple rejection, a bypass capacitor can be con-
nected to the BYP pin. Connecting this capacitor will
not significantly delay the speed of power-up.
To reduce board cost and layout size the CM3015 was
designed to be stable with or without any output capac-
itor. This includes tiny, low ESR ceramic capacitors.
The CM3015 is available in a low profile, 8-lead MSOP
package and 5 and 6-lead SOT23 packages making it
ideal for space critical applications.
Block Diagram
IN
VREF
BYP
Fast
Power-Up
EN
GND
Reverse
Current
Protection
OUT
Current
Limit
+
AMP
- EN
Enable
Control
Thermal
Overload
Active
Pulldown
R1
VSENSE*
R2
* Adjustable output version only
© 2004 California Micro Devices Corp. All rights reserved.
09/14/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com
1
1 page  
PRELIMINARY
CM3015www.DataSheet4U.com
Performance Information
Typical DC Characteristics (nominal conditions unless specified otherwise)
Nominal Conditions: CIN = 1µF, COUT = 2.2µF, No CBYP , VIN = 4.0V, Load = 5mA (all plots measured with 3.0V
VOUT)
g
3.10
3.05
3.00
2.95
2.90
0
100 200 300 400
CURRENT LOAD [mA]
Figure 1. Load Regulation
500
3.00
2.98
2.96
2.94
2.92
2.90
2.88
2.86
3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE [V]
Figure 4. Line Regulation (ILOAD=300mA)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 100 200 300 400 500
LOAD [mA]
Figure 2. Dropout Voltage (VOUT=2.9V)
3.04
3.02
3
2.98
2.96
2.94
2.92
2.9
3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE [V]
Figure 5. Line Regulation (ILOAD=5mA)
4.0
3.0
2.0
1.0
0.0
0 100 200 300 400 500 600 700 800 900
LOAD CURRENT [mA]
Figure 3. Foldback Current Limiting
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
1mA Load
12345
INPUT VOLTAGE [V]
6
Figure 6. Line Regulation (ILOAD=1mA)
© 2004 California Micro Devices Corp. All rights reserved.
09/14/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com
5
5 Page 
PRELIMINARY
CM3015www.DataSheet4U.com
Application Information
VIN=VOUT+
RDROP(IOUT)
VOUT=VSENSE (1+R1/R2)
1 VIN
VOUT 6
VOUT=
4.992V
R1 31.6k
2 GND SENSE 5 1.20V
3 EN
BYP 4
R2 10.0k
For the input voltage, Vin minimum will depend on the output current. For
example, if Iout is 100mA, Vin must be at least 4.992V = 1ohm x 100mA =
4.992 + 0.1 = 5.092V.
Figure 32. Adjustable Regulator Application Example
Output Compensation
Low-dropout regulator topologies use a current-carry-
ing transistor ("pass device") that adds additional gain
and phase shift to the design. It is necessary to com-
pensate for these attributes to prevent the design from
becoming unstable. The simplest way to do this is to
add an output RC filter to roll off the gain. Since all reg-
ulators use an output capacitor anyway, the only com-
ponent needed is a suitable resistance. Fortunately, for
the usual range and types of output capacitors, this
resistance can be supplied by the ESR of the caps.
For many years, capacitors have been the largest com-
ponents in regulator circuits, but newer types are
shrinking in size rapidly. Unfortunately, their ESRs
have shrunk as well, taking them out of the range
where they can perform the R function described in
existing LDOs. The CM3015 is a new breed of LDO
regulator that can work with these tiny low-ESR capac-
itors and thus permit designs that take a minimum of
space.
An attribute of the LDO topology is that the pass device
gain generally increases with increasing output current.
This may affect output stability: a design that didn't
need a capacitor now does, or a design that used a
small value now needs a larger one. The CMD advan-
tage is that this component can be selected from any
capacitor family without regard to its ESR. If the circuit
calls for a tiny, low-ESR capacitor, it will work just fine.
© 2004 California Micro Devices Corp. All rights reserved.
09/14/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CM3015.PDF ] | |
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