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MIC5259-3.3BML Datasheet(PDF) 1 Page - Micrel Semiconductor

Part # MIC5259-3.3BML
Description  300mA High PSRR, Low Noise UCap CMOS LDO
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC5259-3.3BML Datasheet(HTML) 1 Page - Micrel Semiconductor

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MIC5259
Micrel, Inc.
May 2005
1
M9999-051305
General Description
TheMIC5259isanefficientCMOSvoltageregulatoroptimized
for low-noise applications. It offers 1.5% initial accuracy, low
dropout voltage (300mV at 300mA) and low ground current
(typically 105µA at light load). The MIC5259 provides a very-
low-noise output, ideal for RF applications where a clean
voltage source is required. The MIC5259 has a high PSRR
even at low supply voltages, critical for battery operated
electronics. A noise bypass pin is also available for further
reduction of output noise.
Designed specifically for handheld and battery-powered
devices, the MIC5259 provides a TTL-logic-compatible
enable pin. When disabled, power consumption drops to
nearly zero.
The MIC5259 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications; critical issue in handheld wireless devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up device
turn-off. The MIC5259 is available in the 6-pin 2mm × 2mm
MLF™ package and the ThinSOT™-23-5 package in a wide
range of output voltages.
Typical Application
MIC5259
300mA High PSRR, Low Noise µCap CMOS LDO
Features
• Input voltage range: 2.7V to 6.0V
• PSRR = 70dB @ 1kHz
• Low output noise: 30µV(rms)
• Stability with ceramic output capacitors
• Low-dropout: 300mV @ 300mA
• High-output accuracy:
1.5% initial accuracy
3.0% over temperature
• Low quiescent current: 105µA
• Tight load and line regulation
• TTL-Logic-controlled enable input
• “Zero” off-mode current
• Thermal shutdown and current limit protection
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
• Industrial portable electronics
• PC peripherals
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MicroLeadFrame and MLF are trademarks of Amkor Technology.
ThinSOT is a trademark of Linear Technology Corporation.
COUT= 1.0µF
Ceramic
1
5
2
3
4
CBYP= 0.01µF
Enable
Shutdown
EN
VOUT
MIC5259-x.xBD5
EN (pin 3) may be
connected directly
to IN (pin 1).
VIN
CIN = 1.0µF
Ceramic
MIC5259-x.xBML
1
EN
6
CBYP
(optional)
VIN
VOUT
COUT = 1.0µF
5
4
2
3
ENABLE
SHUTDOWN
CIN = 1.0µF
0.01µF
Ultra-Low-Noise Regulator Application


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