MIC5259-3.3YD5 Micrel Semiconductor, MIC5259-3.3YD5 Datasheet

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MIC5259-3.3YD5

Manufacturer Part Number
MIC5259-3.3YD5
Description
Manufacturer
Micrel Semiconductor
Datasheet
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
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 in a wide range of output voltages.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Typical Application
C
Shutdown
EN (pin 3) may be
connected directly
to IN (pin 1).
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
September 2006
IN
Enable
Ceramic
= 1.0µF
MIC5259
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
EN
V
IN
MIC5259-x.xBD5/YD5
also
1
2
3
®
package and the 5-pin Thin SOT-23
works
5
4
with
V
C
OUT
C
Ceramic
BYP
OUT
low-ESR
= 0.01µF
= 1.0µF
SHUTDOWN
ceramic
ENABLE
C
IN
= 1.0µF
1
V
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:
• 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
EN
IN
300mA High PSRR, Low Noise µCap CMOS LDO
– 1.5% initial accuracy
– 3.0% over temperature
Ultra-Low Noise Regulator Application
MIC5259-x.xBML/YML
1
2
3
MIC5259
6
5
4
0.01µF
C
(optional)
BYP
M9999-091406
C
OUT
V
OUT
= 1.0µF

Related parts for MIC5259-3.3YD5

MIC5259-3.3YD5 Summary of contents

Page 1

... 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. ...

Page 2

... MIC5259-1.8YD5 MIC5259-2.5BD5 MIC5259-2.5YD5 MIC5259-2.8BD5 MIC5259-2.8YD5 MIC5259-2.85BD5 MIC5259-2.85YD5 MIC5259-3.0BD5 MIC5259-3.0YD5 MIC5259-3.3BD5 MIC5259-3.3YD5 MIC5259-1.5YML MIC5259-1.8YML MIC5259-2.1YML MIC5259-2.5BML MIC5259-2.5YML MIC5259-2.8BML MIC5259-2.8YML MIC5259-2.85BML MIC5259-2.85YML MIC5259-3.0BML MIC5259-3 ...

Page 3

... BYP 53 53 350 475 30 1.6 0.01 0.01 500 150 – θ . Exceeding the maximum allowable power J(max the MIC5259-x.xBM5 (all versions MIC5259 IN Max Units 1 0.3 %/V 3 500 mV 550 mV 1 µA 150 µA 250 µ µ ...

Page 4

... Micrel, Inc. Typical Characteristics September 2006 4 MIC5259 M9999-091406 ...

Page 5

... Micrel, Inc. Typical Characteristics (cont.) September 2006 5 MIC5259 M9999-091406 ...

Page 6

... Micrel, Inc. Functional Characteristics September 2006 6 MIC5259 M9999-091406 ...

Page 7

... Micrel, Inc. Functional Diagram IN Reference Voltage E N Thermal Sensor Under- voltage Lockout GND September 2006 Startup/ Quickstart/ Shutdown Noise Control Cancellation FAULT Error Current Amplifier Amplifier ACTIVE SHUTDOWN 7 MIC5259 OUT M9999-091406 ...

Page 8

... N-Channel MOSFET that turns on when the device is disabled. This allows the output capacitor and load to discharge, de-energizing the load. No-Load Stability The MIC5259 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applica- tions. ...

Page 9

... D(max) D conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5259-2.8BML at 70°C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: ° ...

Page 10

... Micrel, Inc. Package Information September 2006 5-Pin Thin SOT-23 (D5) ® 6-Pin 2mm x 2mm MLF (ML) 10 MIC5259 M9999-091406 ...

Page 11

... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully September 2006 indemnify Micrel for any damages resulting from such use or sale. © 2004 Micrel, Incorporated. 11 MIC5259 M9999-091406 ...

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