MIC5248-1.2YM5 Micrel Inc, MIC5248-1.2YM5 Datasheet

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MIC5248-1.2YM5

Manufacturer Part Number
MIC5248-1.2YM5
Description
Manufacturer
Micrel Inc
Datasheet

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MIC5248
General Description
The MIC5248 is an efficient, precise CMOS voltage regulator
with power good output. The MIC5248 offers better than 3%
initial accuracy, and constant ground current (typically 100 A)
over load.
The MIC5248 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld 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 MIC5248 is a fixed 1.2V regulator.
Typical Application
November 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
MIC5248-1.2BM5
MIC5248-1.2YM5
EN (pin 3) may be
connected directly
to IN (pin 1).
Shutdown
Low-Noise Regulator Application
Enable
V
IN
EN
MIC5248-x.xBM5
1
2
3
1
Marking
47k
KV12
LV12
Features
• Power Good indicator
• Load independent, ultra-low 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
1.2
1.2
V
PG
C
OUT
CC
OUT
and V
Final Information
Junction Temp. Range*
MIC5248
–40 C to +125 C,
–40 C to +125 C
PP
regulation/switching
Lead-free
SOT-23-5
SOT-23-5
Package
MIC5248
Micrel

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MIC5248-1.2YM5 Summary of contents

Page 1

... 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 MIC5248-1.2BM5 LV12 MIC5248-1.2YM5 KV12 Other voltages available. Contact Micrel for details. 47k MIC5248-x.xBM5 Enable ...

Page 2

... OUT MIC5248-x.xBM5 Pin Description Pin Number Pin Name GND OUT MIC5248 EN PG MIC5248-x.xYM5 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 GND KVxx 4 5 OUT ...

Page 3

... See “Timing Diagram” 3 (Note 2) ) ......................................... +2. .................................. ................................... ....................... – +125 ......................................................235 C +125 C; unless noted. J Min Typical –3 –4 –0.3 0 4.0 0.45 100 100 = 150mA 60 OUT 160 350 1.6 0.01 0.01 150 10 89.5 0.02 0.01 1 Micrel IN IN Max Units 0.3 %/V 5 150 A 150 0 96 MIC5248 ...

Page 4

... IN EN Reference Voltage Thermal Sensor Under- voltage Lockout Overcurrent Dropout Detection Timing Diagram 96.5% V OUT Indeterminable when V low EN MIC5248 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 DOWN PG GND 89 ...

Page 5

... 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) MIC5248 ...

Page 6

... MIC5248 MIC5248 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 November 2002 ...

Page 7

... This allows the output capacitor and load to dis- charge, de-energizing the load. Thermal Considerations The MIC5248 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

... For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the Regulator Thermals section of Micrel’s Designing with Low-Dropout Voltage Regu- lators handbook. MIC5248 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 ...

Page 9

... REF 3.02 (0.119) 2.80 (0.110) 0.50 (0.020) 0.35 (0.014) November 2002 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) MIC5248 ...

Page 10

... MIC5248 MIC5248 10 Micrel November 2002 ...

Page 11

... MIC5248 November 2002 11 Micrel MIC5248 ...

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. MIC5248 + 1 (408) 944-0970 http://www ...

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