MIC5255-3.3YML Micrel Inc, MIC5255-3.3YML Datasheet

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MIC5255-3.3YML

Manufacturer Part Number
MIC5255-3.3YML
Description
Manufacturer
Micrel Inc
Datasheet
General Description
The MIC5255 is an efficient, precise CMOS voltage
regulator optimized for ultra-low-noise applications. It
offers 1% initial accuracy, extremely-low dropout voltage
(135mV at 150mA) and low ground current (typically
90µA). The MIC5255 provides a very-low-noise output,
ideal for RF applications where a clean voltage source is
required. A noise bypass pin is also available for further
reduction of output noise.
Designed specifically for handheld and battery-powered
devices, the MIC5255 provides a TTL-logic-compatible en-
able pin. When disabled, power consumption drops nearly
to zero.
The
MIC5255
also
works
capacitors, reducing the amount of board space necessary
for power applications, critical in handheld wireless
devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up
device turn-off. Available in the 6-pin 2mm × 2mm MLF
®
package, the IttyBitty
SOT-23-5 package and the new
Thin SOT-23-5, which offers the same footprint as the
®
standard IttyBitty
SOT-23-5, but only 1mm tall. The
MIC5255 offers a range of output voltages.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
MIC5255-x.x_M5
V
C
= 1.0µF
IN
1
5
IN
Ceramic
2
3
4
Enable
Shutdown
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
IttyBitty is a registered trademark of Micrel, Inc
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
November 2006
Features
• Input voltage range: 2.7V to 6.0V
• Thin SOT package: 1mm height SOT-23-5
• Ultra-low output noise: 30µV(rms)
• Stability with ceramic output capacitors
• Ultra-low dropout: 135mV @ 150mA
• High output accuracy:
• Low quiescent current: 90µA
• Tight load and line regulation
• TTL-Logic-controlled enable input
with
low-ESR
ceramic
• “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
V
OUT
C
= 1.0µF
OUT
Ceramic
C
= 0.01µF
BYP
408
1
MIC5255
150mA Low Noise µCap CMOS LDO
1.0% initial accuracy
2.0% over temperature
Ultra-Low-Noise Regulator Application
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-110906

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MIC5255-3.3YML Summary of contents

Page 1

... General Description The MIC5255 is an efficient, precise CMOS voltage regulator optimized for ultra-low-noise applications. It offers 1% initial accuracy, extremely-low dropout voltage (135mV at 150mA) and low ground current (typically 90µA). The MIC5255 provides a very-low-noise output, ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further reduction of output noise. Designed specifi ...

Page 2

... MIC5255-3.0BML MIC5255-3.0YML MIC5255-3.1BM5 MIC5255-3.1YM5 MIC5255-3.2BM5 MIC5255-3.2YM5 MIC5255-3.3BD5 MIC5255-3.3YD5 MIC5255-3.3BM5 MIC5255-3.3YM5 MIC5255-3.3BML MIC5255-3.3YML MIC5255-3.5BM5 MIC5255-3.5YM5 Notes: * Other Voltage available. Contact Micrel for details. ** Under bar / Over bar symbol may not be to scale. *** Over bar symbol located after Pin 1 identifier. November 2006 Marking ...

Page 3

... GND to reduce output noise. May be left open. OUT Regulator Output internal connection. GND Ground: Internally connected to the exposed pad. Connect externally to GND pin. 3 MIC5255 6 BYP GND 2 4 OUT IN 3 MIC5255-x.xBML ® 6-Pin 2x2 MLF (ML) 6 BYP GND OUT IN 3 MIC5255-x.xYML ® 6-Pin 2x2 MLF (ML) M9999-110906 ...

Page 4

... JA ≤ +125°C; unless noted. J Min Typ –1 –2 0.02 1.5 0.1 90 135 0.2 90 117 = 0.01µF 60 BYP 60 50 160 425 30 1.6 0.01 0.01 500 150 10 MIC5255 IN Max Units 0.05 %/V 2 150 mV 200 mV mV 250 µA 1 150 µA µ µV(rms ...

Page 5

... Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. November 2006 (ambient temperature D(max) J(max) 5 – θ . Exceeding the maximum allowable power the MIC5255-x.xBM5 (all versions M9999-110906 MIC5255 ...

Page 6

... Micrel, Inc. Typical Characteristics November 2006 6 MIC5255 M9999-110906 ...

Page 7

... Micrel, Inc. Typical Characteristics November 2006 7 MIC5255 M9999-110906 ...

Page 8

... Micrel, Inc. Functional Characteristics November 2006 8 MIC5255 M9999-110906 ...

Page 9

... Micrel, Inc. Functional Diagram November 2006 9 MIC5255 M9999-110906 ...

Page 10

... 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 MIC5255 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially applications. Thermal Considerations ...

Page 11

... Therefore, a 3.0V application at 150mA of output current can accept a maximum input voltage of 5. SOT- 23-5 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “ Reg- ulator Thermals ” section of Micrel’s Designing with Low- Dropout Voltage Regulators handbook. 11 MIC5255 M9999-110906 ...

Page 12

... Micrel, Inc. Package Information November 2006 5-Pin SOT (M5) 5-Pin Thin SOT (D5) 12 MIC5255 M9999-110906 ...

Page 13

... 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 November 2006 ® 6-Pin MLF (ML) indemnify Micrel for any damages resulting from such use or sale. © 2004 Micrel, Incorporated. 13 MIC5255 M9999-110906 ...

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