MIC5246 Micrel Semiconductor, MIC5246 Datasheet

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MIC5246

Manufacturer Part Number
MIC5246
Description
150mA Cap CMOS LDO Regulator Preliminary Information
Manufacturer
Micrel Semiconductor
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
MIC5246-2.85YM5
Manufacturer:
MICREL
Quantity:
103
Part Number:
MIC5246-2.8BM5
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Part Number:
MIC5246-3.0BM5
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MICREL
Quantity:
2 250
Part Number:
MIC5246-3.0BM5
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MICREL/麦瑞
Quantity:
20 000
Part Number:
MIC5246-3.0YM5
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MICREL
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2 250
Part Number:
MIC5246-3.3BM5
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Part Number:
MIC5246-3.3YM5
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
MIC5246
General Description
The MIC5246 is an efficient, precise CMOS voltage regulator
optimized for low-noise applications. The MIC5246 offers
better than 1% initial accuracy, extremely-low-dropout volt-
age (typically 150mV at 150mA) and constant ground current
(typically 85 A)over load . The MIC5246 features an error
flag that indicates an output fault condition such as overcurrent,
thermal shutdown and dropout. The MIC5246 provides a very
low noise output, ideal for RF applications where quiet
voltage sources are required.
Designed specifically for hand-held and battery-powered
devices, the MIC5246 provides a TTL-logic-compatible en-
able pin. When disabled, power consumption drops nearly to
zero.
The MIC5246 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
package, the MIC5246 also offers a range of fixed output
voltages.
Typical Application
June 2000
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Ordering Information
Other voltages available. Contact Micrel for details.
Part Number
MIC5246-2.6BM5
MIC5246-2.7BM5
MIC5246-2.8BM5
MIC5246-2.85BM5
MIC5246-3.0BM5
MIC5246-3.3BM5
EN (pin 3) may be
connected directly
to IN (pin 1).
Shutdown
Low-Noise Regulator Application
Enable
V
IN
EN
MIC5246-x.xBM5
1
2
3
47k
Marking
1
LT26
LT27
LT28
LT2J
LT30
LT33
Features
• Error flag indicates fault condition
• Ultralow dropout—100mV @ 100mA
• Load independent, ultralow ground current: 85 A
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
• “Zero” off-mode current
• Stability with low-ESR capacitors
• 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
5
4
150mA Cap CMOS LDO Regulator
Voltage
2.85V
2.6V
2.7V
2.8V
3.0V
3.3V
C
FLG
V
FLG
C
OUT
CC
Preliminary Information
OUT
and V
Junction Temp. Range
MIC5246
–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
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Package
MIC5246
Micrel

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MIC5246 Summary of contents

Page 1

... The MIC5246 offers better than 1% initial accuracy, extremely-low-dropout volt- age (typically 150mV at 150mA) and constant ground current (typically 85 A)over load . The MIC5246 features an error flag that indicates an output fault condition such as overcurrent, thermal shutdown and dropout. The MIC5246 provides a very low noise output, ideal for RF applications where quiet voltage sources are required ...

Page 2

... LTxx 4 5 FLG OUT MIC5246-x.xBM5 Pin Function Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. Error Flag (Output): Open-drain output. Active low indicates an output undervoltage condition. Regulator Output Operating Ratings ...

Page 3

... FLG 3 T +125 C; unless noted. J Min Typical Max –1 1 –2 2 –0 100 150 150 200 250 0 150 85 150 50 160 300 0.8 0.4 1.6 1 0.01 0.01 500 150 0.02 0.4 0.01 Micrel Units % % %/ MIC5246 ...

Page 4

... I = 150mA LOAD 0 -40 - 110 140 TEMPERATURE ( C) Dropout Characteristics 4 100 A 3 150mA VOLTAGE IN (V) MIC5246 Power Supply Rejection Ratio 50mA LOAD 0 FREQUENCY (Hz) Ground Current vs. Output Current 100 1000 OUTPUT CURRENT (mA) ...

Page 5

... MIC5246 Typical Characteristics Short Circuit Current vs. Temperature 400 300 200 100 0 -40 -10 20 TEMPERATURE ( C) June 2000 3.40 3.36 3.32 3.28 3. OUT 3. 110 140 -40 5 Output Voltage vs. Temperature - 110 140 TEMPERATURE ( C) Micrel MIC5246 ...

Page 6

... MIC5246 Block Diagrams IN EN Reference Voltage Thermal Sensor Under- voltage Lockout Overcurrent Dropout Detection MIC5246 Startup/ Quickstart Shutdown Control FAULT Error Current Amplifier Amplifier ACTIVE SHUTDOWN Out of Regulation Detection 6 PULL UP OUT PULL DOWN FLG GND June 2000 Micrel ...

Page 7

... A). Active Shutdown The MIC5246 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 dis- charge, de-energizing the load. ...

Page 8

... D conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5246-3.0BM5 with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: 125 ...

Page 9

... MIC5246 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) June 2000 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) 9 Micrel 0.20 (0.008) 0.09 (0.004) MIC5246 ...

Page 10

... MIC5246 MIC5246 10 Micrel June 2000 ...

Page 11

... MIC5246 June 2000 11 Micrel MIC5246 ...

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. MIC5246 + 1 (408) 944-0970 http://www ...

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