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CM3702

California Micro Devices
Part Number CM3702
Manufacturer California Micro Devices
Description Micropower Low-Noise Charge-Pump and Linear Regulator
Published Dec 23, 2005
Detailed Description PRELIMINARY CALIFORNIA MICRO DEVICES CM3702 Micropower Low-Noise Charge-Pump and Linear Regulator Features • • • • • ...
Datasheet PDF File CM3702 PDF File

CM3702
CM3702

Overview
PRELIMINARY CALIFORNIA MICRO DEVICES 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 a...


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