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參數資料
| 型號： | CM370250DF |
| 廠商： | California Micro Devices Corporation |
| 英文描述： | Micropower Low-Noise Charge-Pump and Linear Regulator |
| 中文描述： | 微功耗低噪聲電荷泵和線性穩壓器 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 445K |
| 代理商： | CM370250DF |
CALIFORNIA MICRO DEVICES
PRELIMINARY
CM3702
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
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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
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
Block Diagram
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.
STANDARD PART ORDERING INFORMATION
Standard Finish
Lead-free Finish
Pins
Package
Ordering Part
Number
Part Marking
Ordering Part
Number
Part Marking
10
MSOP-10
CM3702-50MR
3702 50S
CM3702-50MS
3702 50
10
TDFN-10
CM3702-50DF
CM370 250DF
CM3702-50DE
CM370 250DE
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| CM3706GIM25 | 1.5MHz, 600mA Synchronous Step-Down Regulator |
| CM3706IM25 | 1.5MHz, 600mA Synchronous Step-Down Regulator |
| CM3718 | 1.5A LOW NOISE PWM STEP DOWN REGULATOR |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| CM3702-50DF | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Micropower Low-Noise Charge-Pump and Linear Regulator |
| CM3702-50MR | 功能描述:電荷泵 Charge Pump LDO RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| CM3702-50MS | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Micropower Low-Noise Charge-Pump and Linear Regulator |
| CM3706 | 制造商:CHAMP 制造商全稱:CHAMP 功能描述:1.5MHz, 600mA Synchronous Step-Down Regulator |
| CM3706A | 制造商:CHAMP 制造商全稱:CHAMP 功能描述:1.5MHz, 600mA Synchronous Step-Down Regulator |
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