MIC5268 Micrel Semiconductor, MIC5268 Datasheet

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MIC5268

Manufacturer Part Number
MIC5268
Description
150mA UCap CMOS LDO Regulator w/Power Good
Manufacturer
Micrel Semiconductor
Datasheet

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MIC5268
General Description
The MIC5268 is an efficient, precise CMOS voltage regulator
with power good output. The MIC5268 offers better than 3%
initial accuracy, and constant ground current (typically
100 A)over load .
The MIC5268 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 MIC5268 is a fixed 1.2V regulator.
Typical Application
September 2002
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
MIC5268-1.2BM5
1.2V Regulator with Power Good
EN (pin 3) may be
connected directly
to IN (pin 1).
Shutdown
Enable
V
IN
EN
MIC5268-x.xBM5
1
2
3
Marking
1
47k
L512
Features
• Power Good indicator
• Load independent, ultralow ground current: 100 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
• Processor power-up sequencing
• Laptop, notebook, and palmtop computers
• PCMCIA V
150mA Cap CMOS LDO Regulator w/Power Good
5
4
Voltage
V
PG
C
OUT
1.2
OUT
CC
Preliminary Information
and V
Junction Temp. Range*
MIC5268
–40 C to +125 C
PP
regulation/switching
SOT-23-5
Package
MIC5268
Micrel

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MIC5268 Summary of contents

Page 1

... MIC5268 General Description The MIC5268 is an efficient, precise CMOS voltage regulator with power good output. The MIC5268 offers better than 3% initial accuracy, and constant ground current (typically 100 A)over load . The MIC5268 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices ...

Page 2

... IN 2 GND OUT MIC5268 EN GND L512 OUT MIC5268-x.xBM5 Pin Function Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. Power Good Output Regulator Output 2 Micrel September 2002 ...

Page 3

... C to +125 ......................................................235 C +125 C; unless noted. J Min Typical –3 –4 –0.3 3 0.45 110 110 = 150mA tbd OUT 160 350 1.6 0.01 0.01 150 10 88 250 0.01 1 Micrel IN IN Max Units 0.3 %/ 150 A 150 0 500 MIC5268 ...

Page 4

... MIC5268 Block Diagrams IN EN Reference Thermal Lockout Overcurrent Timing Diagram V 97% OUT MIC5268 Startup/ Quickstart Shutdown Voltage Control FAULT Sensor Error Current Amplifier Amplifier Under- ACTIVE SHUTDOWN voltage Out of Regulation Detection Delay Dropout Detection Min - Max 1-5ms 4 PULL UP OUT ...

Page 5

... TEMPERATURE ( C) Power Good Delay vs. Input Voltage 100 A 1.9 OUT 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1 INPUT VOLTAGE (V) Output Voltage vs. Output Current 1.195 1.19 1.185 1.18 1.175 1.17 1.165 V = 3. 100 120 140 160 OUTPUT CURRENT (mA) Enable Voltage vs. Temperature 1 3.3V IN 1.15 1.1 1.05 1 0.95 0.9 0.85 0.8 -40 - 100120140 TEMPERATURE ( C) MIC5268 ...

Page 6

... D conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5268-1.2BM5 with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: 125 ...

Page 7

... Regulator Thermals section of Micrel’s Designing with Low-Dropout Voltage Regu- lators handbook. 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. September 2002 7 Micrel MIC5268 ...

Page 8

... MIC5268 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) MIC5268 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) 8 Micrel 0.20 (0.008) 0.09 (0.004) September 2002 ...

Page 9

... 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. September 2002 + 1 (408) 944-0970 http://www.micrel.com FAX WEB © 2002 Micrel, Incorporated 9 Micrel MIC5268 ...

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