MIC5258

Manufacturer Part NumberMIC5258
Description150mA UCap CMOS LDO Regulator w/Power Good
ManufacturerMicrel Semiconductor
MIC5258 datasheet
 
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MIC5258
General Description
The MIC5258 is an efficient, precise CMOS voltage regulator
with power good output. The MIC5258 offers better than 3%
initial accuracy, and constant ground current (typically
100 A)over load .
The MIC5258 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 MIC5258 is a fixed 1.2V regulator.
Typical Application
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
September 2001
150mA Cap CMOS LDO Regulator w/Power Good
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
Ordering Information
Part Number
Marking
Voltage
MIC5258-1.2BM5
LN12
Other voltages available. Contact Micrel for details.
47k
MIC5258-x.xBM5
V
V
IN
1
5
2
3
4
Enable
Shutdown
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
Low-Noise Regulator Application
1
MIC5258
Final Information
and V
regulation/switching
CC
PP
Junction Temp. Range*
1.2
–40 C to +125 C
OUT
C
OUT
PG
Micrel
Package
SOT-23-5
MIC5258

MIC5258 Summary of contents

  • Page 1

    ... MIC5258 General Description The MIC5258 is an efficient, precise CMOS voltage regulator with power good output. The MIC5258 offers better than 3% initial accuracy, and constant ground current (typically 100 A)over load . The MIC5258 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 MIC5258 EN GND LNxx OUT MIC5258-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 2001 ...

  • Page 3

    ... C to +125 ...................................................... 235 C +125 C; unless noted. J Min Typical –3 –4 –0.3 3.5 0.45 110 110 = 150mA tbd OUT 160 350 1.6 0.01 0.01 150 10 89 0.02 0.01 1 Micrel IN IN Max Units 0.3 %/ 150 A 150 0 0 MIC5258 ...

  • Page 4

    ... Block Diagrams IN EN Reference Voltage Thermal Sensor Under- voltage Lockout Overcurrent Dropout Detection Timing Diagram V 97% OUT MIC5258 Startup/ Quickstart Shutdown Control FAULT Error Current Amplifier Amplifier ACTIVE SHUTDOWN Out of Regulation Detection Delay Min - Max 1-5ms 4 PULL UP OUT PULL ...

  • Page 5

    ... OUT -40 - 100120140 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. Input Voltage 1.195 I = 100 A OUT 1.19 1.185 1. 150mA OUT 1.175 1.17 2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1 INPUT VOLTAGE (V) Enable Voltage vs. Input Voltage 1.4 1.3 1.2 1.1 1 0.9 0.8 0 100 A OUT 0.6 2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1 INPUT VOLTAGE (V) MIC5258 ...

  • Page 6

    ... MIC5258 MIC5258 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) Power Good Characteristic V = 12V OUT TIME (250 s/div) 6 Micrel September 2001 ...

  • Page 7

    ... This allows the output capacitor and load to dis- charge, de-energizing the load. Thermal Considerations The MIC5258 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 8

    ... 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. MIC5258 8 Micrel September 2001 ...

  • Page 9

    ... MIC5258 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) September 2001 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) MIC5258 ...

  • Page 10

    ... MIC5258 MIC5258 10 Micrel September 2001 ...

  • Page 11

    ... MIC5258 September 2001 11 Micrel MIC5258 ...

  • 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. MIC5258 + 1 (408) 944-0970 http://www ...