|
|
PDF CM3702 Data sheet ( Hoja de datos )
| Número de pieza | CM3702 | |
| Descripción | Micropower Low-Noise Charge-Pump and Linear Regulator | |
| Fabricantes | California Micro Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de CM3702 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
|
No Preview Available !
CALIFORNIA MICRO DEVICES
PRELIMINARY
CM3702
Micropower Low-Noise Charge-Pump and Linear Regulator
Features
• Low noise regulator with integrated charge
pump voltage-booster
• 5V output with input voltage as low as 2.8V
• Charge pump can also power external LDO
• Low noise in 20Hz to 20kHz audio band
• Up to 200mA continuous output current
• Low operating and shutdown currents
• Stable with low-ESR ceramic or tantalum
capacitors
• 10-Lead MSOP and TDFN packages
• Lead-free finishing
Block Diagram
Applications
• 5V analog supply for audio codec in notebook
computers, PDAs, MP3 players, etc.
• 3.3V to 5V conversion in PCMCIA cards, PCI
Express Cards, other applications needing 5V
Product Description
The CM3702 low-noise charge pump LDO regulator is designed to provide accurate and “clean” power to a
subsystem, e.g an audio codec, LED driver, or flash memory. The 5V output provides up to 100mA continuous
current for input voltages from 2.8V to 5.5V, and up to 200mA for a narrower range. This is accomplished with an
integrated charge pump that boosts the input voltage before feeding it to an internal LDO linear regulator. The
charge pump is designed to maintain a nominal 0.8V differential between the input and output of the LDO
regulator. This allows the LDO regulator to operate with good power supply ripple rejection across the audio band
while maintaining good power efficiency. The charge pump works with two external capacitors and operates at
250kHz, well outside the audible frequency band. In addition, separate analog and digital ground pins are
provided for the charge pump and the rest of the circuitry to eliminate ground noise feed-through from the charge
pump to the regulated output.
The CM3702 is fully protected, offering both overload current limiting and high temperature thermal shutdown.
Two enable inputs provide flexibility in powering down the device. For maximum power saving in shutdown, both
the charge pump and LDO regulator should be disabled. For applications that require the 5V output to be re-
established with minimum delay after shutdown, the charge pump can be left enabled while the regulator is
disabled. This avoids the delay that may otherwise be required for the charge pump to reach full operating
voltage after being disabled. The CMOS LDO regulator features low quiescent current even at full load, making it
very suitable for power sensitive applications.
A bandgap reference bypass pin is provided to further minimize noise by connecting an external capacitor
between this pin and ground. Another, external, regulator can be connected to the charge pump output pin Cs, if
required.
The CM3702 is available in 10-pin MSOP and TDFN packages, both with optional lead-free finishing, and are
ideal for space critical applications.
Pins
10
10
Package
MSOP-10
TDFN-10
STANDARD PART ORDERING INFORMATION
Standard Finish
Lead-free Finish
Ordering Part
Number
Part Marking
Ordering Part
Number
Part Marking
CM3702-50MR
3702 50S
CM3702-50MS
3702 50
CM3702-50DF
CM370 250DF
CM3702-50DE
CM370 250DE
© 2004 California Micro Devices Corp. All rights reserved.
9/22/04 430 N. McCarthy Blvd, #100, Milpitas , CA 95035
Tel: (408) 263-3214 Fax: (408) 263-7846
www.calmicro.com
1
1 page  
CALIFORNIA MICRO DEVICES
PRELIMINARY
CM3702
Typical Performance Characteristics (T=25°C, Cp=1uF, Cs=10uF, Cbyp=0.1uF, C_OUT=10uF unless stated)
V_OUT v s. I_OUT (V_IN = 5V)
5.1
5.08
5.06
5.04
5.02
5
4.98
4.96
4.94
4.92
4.9
0
20 40 60 80
I_OUT [mA]
100
5.1
5.08
5.06
5.04
5.02
5
4.98
4.96
4.94
4.92
4.9
3
V_OUT vs. V_IN
I_OUT=0mA
I_OUT=100mA
3.5 4 4.5 5 5.5
V_IN [V]
V_EN Threshold vs. V_IN
2
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
3 3.5 4 4.5 5
V_IN [V]
5.5
I_IN vs. V_IN
300
250
200
150
100
50
0
3 3.5 4 4.5 5 5.5
V_IN [V]
7
6.75
6.5
6.25
6
5.75
5.5
5.25
5
3
CS pin vs. V_IN
3.5 4 4.5 5
V_IN [V]
5.5
DROPOUT VOLTAGE (LDO ONLY)
at T=150'C, T=85'C and T=25'C
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100
I_OUT [mA]
250
200
150
100
50
0
0
I_IN vs. I_OUT
V _IN=3.1V
V _IN=5V
20 40 60 80 100
I_OUT [mA]
Overcurrent characteristic (LDO only)
6
5
4
3
2
1
0
0 0.1 0.2 0.3 0.4
I_OUT [A]
0.5
© 2004 California Micro Devices Corp. All rights reserved
09/22/04 430 N. McCarthy Blvd, #100, Milpitas, California 95035
Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
5
5 Page 
CALIFORNIA MICRO DEVICES
PRELIMINARY
CM3702
© 2004 California Micro Devices Corp. All rights reserved
09/22/04 430 N. McCarthy Blvd, #100, Milpitas, California 95035
Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet CM3702.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CM3702 | Micropower Low-Noise Charge-Pump and Linear Regulator | California Micro Devices |
| CM3706 | Synchronous Step-Down Regulator |  Champion |
| CM3708 | 3A LOOW NOISE PWM STEP DOWN REGULATOR |  ETC |
| CM3708A | 3A LOW LOISE PWM STEP DOWN REGULATOR | ETC |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |