MIC5255-2.8YD5 Micrel Inc, MIC5255-2.8YD5 Datasheet

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MIC5255-2.8YD5

Manufacturer Part Number
MIC5255-2.8YD5
Description
Manufacturer
Micrel Inc
Datasheet
MIC5255
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 90 A). The MIC5255 pro-
vides 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 de-
vices, the MIC5255 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5255 also works with low-ESR ceramic 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.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Typical Application
MIC5255-x.xBM5
V
IN
C
= 1.0 F
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.
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000• http://www.micrel.com
August, 2004
150mA Low Noise Cap CMOS LDO
Features
• Input voltage range: 2.7V to 6.0V
• Thin SOT package: 1mm height SOT-23-5
• Ultra-low output noise: 30 V(rms)
• Stability with ceramic output capacitors
• Ultra-low dropout: 135mV @ 150mA
• High output accuracy:
1.0% initial accuracy
2.0% over temperature
• Low quiescent current: 90 A
• 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
V
V
IN
OUT
ENABLE
EN
SHUTDOWN
C
= 1.0 F
OUT
Ceramic
C
= 0.01 F
BYP
Ultra-Low-Noise Regulator Application
1
Micrel
MIC5255
V
OUT
MIC5255-x.xBML
C
1
6
OUT
C
BYP
(optional)
5
2
4
3
M0385-080204

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MIC5255-2.8YD5 Summary of contents

Page 1

... 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. All support documentation can be found on Micrel’s web site at www ...

Page 2

... MIC5255-2.85BM5 MIC5255-2.85YM5 MIC5255-2.9BM5 MIC5255-2.9YM5 MIC5255-3.0BM5 MIC5255-3.0YM5 MIC5255-3.0BML MIC5255-3.0YML MIC5255-3.1BM5 MIC5255-3.1YM5 MIC5255-3.2BM5 MIC5255-3.2YM5 MIC5255-3.3BM5 MIC5255-3.3YM5 MIC5255-2.6BD5 MIC5255-2.6YD5 MIC5255-2.7BD5 MIC5255-2.7YD5 MIC5255-2.8BD5 MIC5255-2.8YD5 MIC5255-2.85BD5 MIC5255-2.85YD5 MIC5255-2.9BD5 MIC5255-2.9YD5 MIC5255-3.0BD5 MIC5255-3.0YD5 MIC5255-3.3BD5 MIC5255-3.3YD5 August, 2004 Marking Voltage Temperature Range Standard Pb-Free LW25 LW25 2.5V – +125 C LW26 LW26 2 ...

Page 3

... Reference Bypass: Connect external 0.01 F GND to reduce output noise. May be left open. OUT Regulator Output NC No internal connection. GND Ground: Internally connected to the exposed pad. Connect externally to GND pin. 3 Micrel EN GND NWxx 4 5 BYP OUT MIC5255-x.xBD5 (TSOT-23-5) C 1.0 F capacitor to BYP M0385-080204 ...

Page 4

... C; unless noted. J Min Typical –1 –2 0.02 (6) 1.5 0.1 90 135 0.2 90 117 = 0. BYP 60 50 160 425 30 1.6 0.01 0.01 500 150 10 (max)– Exceeding the maximum allowable the MIC5255-x.xBM5 (all JA Micrel IN Max Units 0.05 %/V 2 150 mV 200 mV 250 150 V(rms) 0 ...

Page 5

... MIC5255 Typical Characteristics Power Supply Rejection Ratio 100 A* 40 50mA* 30 100mA* 150mA LOAD Ceramic OUT 0 FRQUENCY (Hz) PSRR vs. Voltage Drop 100 A LOAD 150mA LOAD OUT BYP 0 0 200 400 600 800 1000 VOLTAGE DROP (mV) Ground Pin Current 115 113 111 109 107 ...

Page 6

... MIC5255 Short Circuit Current 500 OUT 490 480 470 460 450 440 430 420 410 400 -40 - 100120140 TEMPERATURE ( C) August, 2004 Output Voltage vs. Temperature 3.05 3.04 3.03 3.02 3.01 3.00 2.99 2.98 2.97 2. 100 A LOAD 2.95 -40 - 100120140 TEMPERATURE ( C) Turn-On Time vs. Bypass Capacitance ...

Page 7

... MIC5255 Functional Characteristics Line Transient Response Ceramic Ceramic OUT C = 0.01 F BYP I = 100 A OUT TIME (400 s/div) Enable Pin Delay TIME (10 s/div) August, 2004 Ceramic Ceramic OUT C = 0.01 F BYP I = 100 A OUT 7 Load Transient Response Ceramic Ceramic OUT C = 0.01 F BYP V IN 150mA 100 A ...

Page 8

... MIC5255 Block Diagram IN Reference Voltage EN Thermal Sensor Under- voltage Lockout GND August, 2004 Startup/ Quickstart/ Shutdown Noise Control Cancellation FAULT Error Current Amplifier Amplifier ACTIVE SHUTDOWN 8 Micrel BYP OUT M0385-080204 ...

Page 9

... This allows the output capacitor and load to dis- charge, de-energizing the load. August, 2004 No-Load Stability The MIC5255 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5255 is designed to provide 150mA of continuous current in a very small package ...

Page 10

... MIC5255 Package Information 1.90 (0.075) REF 0.95 (0.037) REF 3.02 (0.119) 2.80 (0.110) 0.50 (0.020) 0.35 (0.014) August, 2004 1.75 (0.069) 3.00 (0.118) 1.50 (0.059) 2.60 (0.102) DIMENSIONS: MM (INCH) 1.30 (0.051) 0.90 (0.035 0.15 (0.006) 0.60 (0.024) 0.00 (0.000) 0.10 (0.004) ...

Page 11

... MIC5255 Package Information (continued) DIMENSIONS IN MILLIMETERS MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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