mic47050 Micrel Semiconductor, mic47050 Datasheet

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mic47050

Manufacturer Part Number
mic47050
Description
500ma Uldo With Input Output Voltage
Manufacturer
Micrel Semiconductor
Datasheet

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General Description
The MIC47050 is a high-speed, ultra-low dropout, dual-
supply NMOS ULDO™ designed to take advantage of
point-of-load applications that use multiple supply rails to
generate a low-voltage, high-current power supply. The
MIC47050 can source 500mA of output current while only
requiring a 1
1.5% output voltage accuracy, low dropout voltage (44mV
@ 500mA), and low ground current makes this device
ideally suited for mobile and point-of-load applications.
The MIC47050 has an NMOS output stage offering very
low output impedance. The NMOS output stage makes for
a unique ability to respond very quickly to sudden load
changes such as that required by a microprocessor, DSP
or FPGA. The MIC47050 consumes little quiescent current
and therefore can be used for driving the core voltages of
mobile processors, post regulating a core DC/DC
converter in any processor.
The MIC47050 is available in fixed and adjustable output
voltages in the tiny 2mm x 2mm MLF
operating junction temperature range of −40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Typical Application
March 2010
_________________________________________________________________________________________________________________________
ULDO is a 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 (408) 944-0800 • fax + 1 (408) 474-1000 •
µ
F ceramic output capacitor for stability. A
®
package with an
Features
• Voltage Range
• 0.4V to 2.0V output voltage range
• Low dropout voltage of 44mV at 500mA
• ±1.5% initial output voltage accuracy
• High bandwidth – very fast transient response
• Stable with a 1µF ceramic output capacitor
• Logic level enable input
• UVLO on both supply voltages
• Thermally-enhanced 2mm x 2mm MLF
• Junction temperature range of –40°C to +125°C
Applications
• Point-of-load applications
• PDAs, Notebooks, and Desktops
• Datacom and Telecom systems
• DSP, PLD and FPGA power supply
• Low-voltage post regulation
– Input Voltage: 1.0V to 3.6V
– Bias Voltage: 2.3V to 5.5V
500mA ULDO™ with Low Input
and Low Output Voltage
MIC47050
http://www.micrel.com
®
M9999-032310-A
package

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mic47050 Summary of contents

Page 1

... DC/DC converter in any processor. The MIC47050 is available in fixed and adjustable output voltages in the tiny 2mm x 2mm MLF operating junction temperature range of −40°C to +125°C. Data sheets and support documentation can be found on Micrel’ ...

Page 2

... Enable: TTL/CMOS compatible input. Logic high = enable, logic low = shutdown not leave floating. Exposed thermal pad. Connect to the ground plane to maximize thermal performance. 2 Package Lead Finish ® 6-Pin 2mm x 2mm MLF Pb-Free ® 6-Pin 2mm x 2mm MLF Pb-Free M9999-032310-A MIC47050 (3) ...

Page 3

... A ® 2mm x 2mm MLF -6L (θ )................................90°C/W JA ® 2mm x 2mm MLF -6L (θ )................................45°C/W JC ≤ +125°C, unless noted. J Min. Typ. 1.0 0.7 0.85 + 0.5V OUT 2.3 1.7 1.15 1.25 + 2.1V 330 OUT -1.5 -2.0 -0.1 0.015 MIC47050 < BIAS BIAS BIAS Max. Units 3 0.1 μA 1.0 μA 6 5.5 V 2.3 2 2.1 V μA 500 μ ...

Page 4

... J Min. Typ. -0.05 0.005 0.2 0.6 1.6 1.0 0.77 0.67 100 OUT 160 0.02 -1 0.01 0.394 0.4 0.392 20 63 =1μF OUT = 100mA 50 OUT 37 = 100mA OUT MIC47050 Max. Units 0.05 %/V 0 μA μA 500 μs °C ° 0.1 V μA +1 0.406 V 0.408 V nA μV RMS dB dB M9999-032310-A ...

Page 5

... IN 0.9 400 500 -40 - TEMPERATURE (°C) Bias Current vs. Temperature 400 380 360 340 320 300 = 3.6V 280 = 1.8V 260 = 1.2V 240 400 500 -40 - TEMPERATURE (°C) MIC47050 I = 100mA OUT 100 120 500mA OUT 100 120 V = 3.6V BIAS 1.2V OUT 100 120 ...

Page 6

... TEMPERATURE (°C) Output Noise 3.6V BIAS V = 1.8V 0. 1.2V OUT Noise (10Hz-100kHz) = 56.19µV 0.001 100 1000 0.01 0.1 1 FREQUENCY (kHz) MIC47050 300 400 500 V = 3.6V BIAS 100µA OUT 100 120 RMS 10 100 1000 M9999-032310-A ...

Page 7

... Micrel, Inc. Functional Characteristics March 2010 7 MIC47050 M9999-032310-A ...

Page 8

... Micrel, Inc. Functional Diagram March 2010 MIC47050 Fixed Output Block Diagram MIC47050 Adjustable Output Block Diagram 8 MIC47050 M9999-032310-A ...

Page 9

... See “Typical Characteristic” for examples of load transient response. Output Capacitor The MIC47050 requires an output capacitor of 1µF or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1µ ...

Page 10

... A 20°C hysteresis is built in to allow the device to cool before turning back on. Thermal Considerations The MIC47050 is designed to provide 0.5A of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. ...

Page 11

... IC for long periods of time. For a full discussion of heat sinking and thermal effects of voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf March 2010 thermometer is ® 11 MIC47050 M9999-032310-A ...

Page 12

... Micrel, Inc. MIC47050 Typical Application Schematic March 2010 MIC47050 Adjustable Output MIC47050 Fixed Output 12 MIC47050 M9999-032310-A ...

Page 13

... Micrel, Inc. MIC47050 Bill of Materials Item Part Number GRM21BR60J106ME19 C1 C1608X5R0J106MT GRM155R61A105KE15D C2 C1005X5R0J105KT C3 06035D104MAT2A R1 CRCW06031001FRT1 R2 CRCW06036650FRT1 R3 CRCW06031002FRT1 MIC47050YML U1 MIC47050-1.2YML Notes: 1. Murata: www.murata.com. 2. TDK: www.tdk.com. 3. AVX: www.avx.com. 4. Vishay: www.vishay.com . 5. Micrel, Inc.: www.micrel.com. March 2010 Manufacturer Description (1) Murata Ceramic Capacitor, 10µF, 6.3V, X5R, 0603 size ...

Page 14

... 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 March 2010 6-pin 2mm x 2mm MLF indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 14 ® (ML) http://www.micrel.com MIC47050 nt M9999-032310-A ...

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