MIC5246
Micrel
MIC5246
150mA
碌
Cap CMOS LDO Regulator
Preliminary Information
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碌A(chǔ))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鈩?SOT-23-5
package, the MIC5246 also offers a range of fixed output
voltages.
Features
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Error flag indicates fault condition
Ultralow dropout鈥?00mV @ 100mA
Load independent, ultralow ground current: 85碌A(chǔ)
150mA output current
Current limiting
Thermal Shutdown
Tight load and line regulation
鈥淶ero鈥?off-mode current
Stability with low-ESR capacitors
Fast transient response
TTL-Logic-controlled enable input
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
PCMCIA V
CC
and V
PP
regulation/switching
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Applications
Ordering Information
Part Number
MIC5246-2.6BM5
MIC5246-2.7BM5
MIC5246-2.8BM5
MIC5246-2.85BM5
MIC5246-3.0BM5
MIC5246-3.3BM5
Marking
LT26
LT27
LT28
LT2J
LT30
LT33
Voltage
2.6V
2.7V
2.8V
2.85V
3.0V
3.3V
Junction Temp. Range
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Other voltages available. Contact Micrel for details.
Typical Application
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V
IN
MIC5246-x.xBM5
1
2
Enable
Shutdown
3
4
5
V
OUT
C
OUT
FLG
C
FLG
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
Low-Noise Regulator Application
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
June 2000
1
MIC5246
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