MIC2219 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – Dynamically Adjustable Dual uCap LDO

MIC2219
Micrel, Inc.
MIC2219
Dynamically Adjustable Dual µCap LDO
General Description
The MIC2219 is a dual µCap low dropout regulator. The first
regulator is capable of sourcing 150mA, while the second
regulator can source up to 300mA.
Ideal for battery operated applications, the MIC2219 offers
1% accuracy, extremely low dropout voltage (80mV @
100mA), and extremely low ground current, only 48µA total.
Equipped with TTL logic compatible enable pins, the MIC2219
can be put into a zero-off-mode current state, drawing no
current when disabled. Separate enable pins allow individual
control of each output voltage.
The additional feature incorporated in the MIC2219 is bring-
ing out the feedback nodes to two external pins, allowing for
dynamic adjustment of the LDO output voltages.
The MIC2219 is a µCap design, operating with very small
ceramic output capacitors for stability, reducing required
board space and component cost.
The MIC2219 is available in fixed output voltages in the
10-pin 3mm × 3mm MLF™ leadless package.
Features
• Input voltage range: 2.25V to 5.5V
• Stable with ceramic output capacitor
• 2 LDO outputs
Output 1 - 150mA output current
Output 2 - 300mA output current
• Feedback pins externally accessible
• Low dropout voltage of 80mV @ 100mA
• Ultra-low quiescent current of 48µA total (24µA/LDO)
• High output accuracy:
+1.0% initial accuracy
+2.0% over temperature
• Thermal shutdown protection
• Current limit protection
• Tiny 10-pin 3mm × 3mm MLF™ package
Applications
• Cellular phones
• Wireless modems
• PDAs
• LEDs
Typical Application
MIC2219-xxBML
VIN
VOUT1
OFF ON
EN1
OFF ON
EN2
VOUT2
FB1
1µF
Ceramic 1µF
0.01µF
CBYP
FB2
GND
Vibrator
Motor
LEDs ×10
MIC2219 Typical Cell Phone Application
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
April 2005
1
M9999-042105