MIC5245-2.8BM5 Micrel Inc, MIC5245-2.8BM5 Datasheet

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MIC5245-2.8BM5

Manufacturer Part Number
MIC5245-2.8BM5
Description
Manufacturer
Micrel Inc
Datasheet

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MIC5245
General Description
The MIC5245 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. The MIC5245 of-
fers better than 1% initial accuracy, extremely low dropout
voltage (typically 150mV at 150mA) and constant ground
current over load (typically 100 A). The MIC5245 provides a
very low noise output, ideal for RF applications where quiet
voltage sources are required. A noise bypass pin is also
available for further reduction of output noise.
Designed specifically for hand-held and battery-powered
devices, the MIC5245 provides a TTL logic compatible en-
able pin. When disabled, power consumption drops nearly to
zero.
The MIC5245 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a push-
pull output for faster transient response, and an active clamp
to speed up device turnoff. Available in the IttyBitty™ SOT-23-5
and power MSO-8 packages, the MIC5245 also offers a
range of fixed output voltages.
Typical Application
June 2000
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
EN (pin 3) may be
connected directly
o IN (pin 1).
Shutdown
Enable
V
EN
IN
MIC5245-x.xBM5
1
2
3
5
4
Ordering Information
Other voltages available. Contact Micrel for details.
Part Number
MIC5245-2.5BM5
MIC5245-2.7BM5
MIC5245-2.8BM5
MIC5245-2.85BM5
MIC5245-3.0BM5
MIC5245-3.1BM5
MIC5245-3.3BM5
MIC5245-3.3BMM
(optional)
C
BYP
Ultra-Low-Noise Regulator Application
V
C
OUT
OUT
Marking
1
LS25
LS27
LS28
LS30
LS31
LS33
LS2J
Features
• Ultralow dropout—100mV @ 100mA
• Ultralow noise—30 V(rms)
• Stability with tantalum or ceramic capacitors
• Load independent, ultralow ground current
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
• “Zero” off-mode current
• Fast transient response
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA V
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
150mA Cap CMOS LDO Regulator
Voltage
2.85V
2.5V
2.7V
2.8V
3.0V
3.1V
3.3V
3.3V
V
OUT
V
SHUTDOWN
IN
C
CC
Preliminary Information
ENABLE
OUT
and V
Junction Temp. Range
MIC5245
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
–40 C to +125 C
PP
regulation/switching
C
(OPTIONAL)
1
2
3
4
BYP
MIC5245-3.3MM
8
7
6
5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Package
MSOP-8
MIC5245
Micrel

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MIC5245-2.8BM5 Summary of contents

Page 1

... Laptop, notebook, and palmtop computers • PCMCIA V • Consumer/personal electronics • SMPS post-regulator/dc-to-dc modules • High-efficiency linear power supplies Ordering Information Part Number Marking Voltage MIC5245-2.5BM5 LS25 MIC5245-2.7BM5 LS27 MIC5245-2.8BM5 LS28 MIC5245-2.85BM5 LS2J 2.85V MIC5245-3.0BM5 LS30 MIC5245-3.1BM5 LS31 MIC5245-3.3BM5 LS33 MIC5245-3.3BMM — ...

Page 2

... Enable Input Voltage (V ) ................................. 0V to +7V EN Junction Temperature (T ) ...................................... +150 C J Storage Temperature ............................... – +150 C Lead Temperature (soldering, 5 sec.) ....................... 260 C ESD, Note 3 MIC5245 Pin Function IN Supply Input GND Ground EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. ...

Page 3

... 2.7V to 5.5V, regulator enabled +125 C; unless noted. J Min Typical Max –1 1 –2 2 –0.3 0 0.3 2.0 3.0 1 100 150 150 200 250 0.2 1 100 150 100 = 0. 160 300 30 0.8 0.4 2.0 1 0.17 1.5 500 150 10 Micrel Units % % %/ V(rms MIC5245 ...

Page 4

... OUT 10mA 30 100 cer. OUT 0.01 F BYP 0 0 200 400 600 800 1000 VOLTAGE DROP (mV) MIC5245 Power Supply Rejection Ratio 100 I = 10mA OUT tant OUT OUT 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) ...

Page 5

... A OUT 0 -40 - 100 TEMPERATURE ( C) Ground Pin Current 100 OUT OUT INPUT VOLTAGE (V) Dropout Voltage 300 I = 150mA L 250 200 150 100 50 0 -40 - 100120140 TEMPERATURE ( C) Output Voltage vs. Temperature 3. TYPICAL 3V DEVICE 3.00 2.95 2.90 I LOAD 2.85 - TEMPERATURE ( C) Micrel = 150mA 100 A 100 150 MIC5245 ...

Page 6

... MIC5245 Enable Pin Bias Current 2.0 1.5 1.0 0.5 0 -40 - 100120140 Functional Characteristics Line Transient Response OUT OUT C = 0.01 F BYP I = 100 A OUT TIME (10ms/div.) Enable Pin Delay TIME (20 s/div.) MIC5245 100mV EN TEMPERATURE ( OUT OUT C = 0.01 F BYP load OUT 6 Enable Threshold Voltage ...

Page 7

... MIC5245 Block Diagrams IN Reference Voltage EN Thermal Sensor Under- voltage Lockout GND June 2000 Startup/ Quickstart/ Shutdown Noise Control Cancellation FAULT Error Current Amplifier Amplifier ACTIVE SHUTDOWN 7 Micrel BYP PULL UP OUT PULL DOWN MIC5245 ...

Page 8

... This allows the output capacitor and load to dis- charge, de-energizing the load. Thermal Considerations The MIC5245 is designed to provide 150mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power ...

Page 9

... Figure example of a low-noise configuration where 0.01µ not required. C BYP Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground OUT 9 MIC5245-x.xBM5 OUT 1.0µ Enable Shutdown minimum. OUT Micrel MIC5245 ...

Page 10

... MIC5245 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) MIC5245 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) SOT-23-5 (M) ...

Page 11

... MIC5245 June 2000 11 Micrel MIC5245 ...

Page 12

... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MIC5245 + 1 (408) 944-0970 http://www ...

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