MIC5256-2.5BM5 Micrel Inc, MIC5256-2.5BM5 Datasheet

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MIC5256-2.5BM5

Manufacturer Part Number
MIC5256-2.5BM5
Description
Manufacturer
Micrel Inc
Datasheet
General Description
The MIC5256 is an efficient, precise CMOS voltage
regulator. It offers better than 1% initial accuracy,
extremely low-dropout voltage (typically 135mV at 150mA)
and low ground current (typically 90µA) over load. The
MIC5256 features an error flag that indicates an output
fault condition such as overcurrent, thermal shutdown and
dropout.
Designed specifically for handheld and battery-powered
devices, the MIC5256 provides a TTL-logic-compatible
enable pin. When disabled, power consumption drops
nearly to zero.
The
capacitors, reducing the amount of board space necessary
for power applications, critical in hand-held wireless
devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up
device turnoff. Available in the IttyBitty
package and the new Thin SOT-23-5, which offers the
same footprint as the standard IttyBitty
only 1mm tall. The MIC5256 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
IttyBitty is a registered trademark of Micrel, Inc.
November 2006
MIC5256
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
also
works
with
low-ESR
®
SOT-23-5, but
Low-Noise Regulator Application
®
SOT-23-5
ceramic
1
Features
• Input voltage range: 2.7V to 6.0V
• Thin SOT package: 1mm height
• Error flag indicates fault condition
• Stable with ceramic output capacitor
• Ultralow dropout: 135mV @ 150mA
• High output accuracy:
• Low quiescent current:90µA
• Tight load and line regulation
• Thermal shutdown and current limit protection
• “Zero” off-mode current
• TTL logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
150mA µCap LDO with Error Flag
1.0% initial accuracy
2.0% over temperature
MIC5256
M9999-111606

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MIC5256-2.5BM5 Summary of contents

Page 1

... Available in the IttyBitty package and the new Thin SOT-23-5, which offers the same footprint as the standard IttyBitty only 1mm tall. The MIC5256 offers a range of output voltages. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. ...

Page 2

... Micrel, Inc. Ordering Information Part Number Standard MIC5256-2.5BM5 MIC5256-2.5YM5 MIC5256-2.6BM5 MIC5256-2.6YM5 MIC5256-2.7BM5 MIC5256-2.7YM5 MIC5256-2.8BM5 MIC5256-2.8YM5 MIC5256-2.85BM5 MIC5256-2.85YM5 MIC5256-2.9BM5 MIC5256-2.9YM5 MIC5256-3.0BM5 MIC5256-3.0YM5 MIC5256-3.1BM5 MIC5256-3.1YM5 MIC5256-3.3BM5 MIC5256-3.3YM5 MIC5256-2.85BD5 MIC5256-2.85YD5 Notes: * Under bar symbol ( _ ) may not be to scale. ** Other Voltage available. Contact Micrel for details. ...

Page 3

... Min Typ –1 –2 0.02 1.5 0.1 90 135 0.2 90 117 = 1.0µF 60 OUT = 1.0µF 60 OUT 45 160 425 tbd 1.6 0.01 0.01 500 90 0.02 0.01 150 10 MIC5256 IN Max Units 0.05 %/V 2 150 mV 200 mV mV 250 µA 1 150 µA µ µV(rms) V 0.4 V µ ...

Page 4

... 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. Test Circuit November 2006 (ambient temperature D(max) J(max) 4 –T / θ . Exceeding the maximum allowable power the MIC5255-x.xBM5 (all versions M9999-111606 MIC5256 ...

Page 5

... INPUT VOLTAGE (V) Dropout Voltage 180 160 140 120 100 150mA LOAD 0 -40 - 100120140 TEMPERATURE ( ° MIC5256 Dropout Characteristics 3 100µA 3 LOAD 2 150mA 2 LOAD 1 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE (V) Dropout Voltage 180 T = – ...

Page 6

... Micrel, Inc. Typical Characteristics (cont.) Short Circuit Current 600 500 400 300 200 100 0 3 3.5 4 4.5 5 5.5 6 INPUT VOLTAGE (V) November 2006 6 MIC5256 M9999-111606 ...

Page 7

... Micrel, Inc. Functional Characteristics November 2006 7 MIC5256 M9999-111606 ...

Page 8

... Micrel, Inc. Functional Diagram November 2006 8 MIC5256 M9999-111606 ...

Page 9

... The MIC5256 also features an active shutdown clamp, which is an 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 MIC5256 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS applications ...

Page 10

... 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 MIC5256-3.0BM5 at 50°C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: ° ...

Page 11

... Micrel, Inc. Package Information November 2006 5-Pin SOT (M5) 5-Pin Thin SOT (D5) 11 MIC5256 M9999-111606 ...

Page 12

... 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 November 2006 indemnify Micrel for any damages resulting from such use or sale. © 2003 Micrel, Incorporated. 12 MIC5256 M9999-111606 ...

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