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MIC5259

Description
300mA High PSRR, Low Noise UCap CMOS LDO
File Size3MB,9 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet View All

MIC5259 Overview

300mA High PSRR, Low Noise UCap CMOS LDO

MIC5259
Micrel, Inc.
MIC5259
300mA High PSRR, Low Noise µCap CMOS LDO
General Description
The MIC5259 is an efficient CMOS voltage regulator optimized
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.
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
Typical Application
C
IN
= 1.0µF
Ceramic
Enable
Shutdown
V
IN
MIC5259-x.xBD5
1
2
3
5
V
OUT
C
OUT
= 1.0µF
Ceramic
V
IN
ENABLE
SHUTDOWN
MIC5259-x.xBML
1
2
6
5
4
V
OUT
C
BYP
C
OUT
= 1.0µF
EN
(optional)
4
EN
C
IN
= 1.0µF
3
0.01µF
EN (pin 3) may be
connected directly
to IN (pin 1).
C
BYP
= 0.01µF
Ultra-Low-Noise Regulator Application
MicroLeadFrame
and MLF are trademarks of Amkor Technology.
ThinSOT is a trademark of Linear Technology Corporation.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2005
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