MIC5312 Datasheet, PDF (1/11 Pages) Micrel Semiconductor – LowQ Mode Dual 300mA LDO with Integrated POR

MIC5312
LowQ™ Mode Dual 300mA LDO
with Integrated POR
General Description
The MIC5312 is a high performance, dual µCap low
dropout regulator with integrated power-on reset
supervisor, offering ultra-low operating current and a
second, even lower operating current mode, LowQ™
mode, reducing operating current by 75%. Each
regulator can source up to 300mA of output current
maximum.
Ideal for battery operated applications, the MIC5312
offers 1% accuracy, extremely low dropout voltage
(60mV @ 150mA), and low ground current (typically
28µA total). When put into LowQ™ mode, the internal
current draw drops down to 7µA total. The MIC5312
also comes equipped with a TTL logic compatible
enable pin that allows the part to be put into a zero-off-
mode current state, drawing no current when disabled.
The Power-on Reset is active low and indicates an
output undervoltage condition on either regulator 1 or 2
when the regulator is enabled.
The MIC5312 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
The MIC5312 is available in fixed output voltages in the
3mm x 3mm MLF-10 leadless package. Data sheets
and support documentation can be found on Micrel’s
web site at www.micrel.com.
Features
• Input voltage range: 2.5V to 5.5V
• LowQ™ Mode
- 7µA total quiescent current
- 10mA output current capable LowQ™ mode
- Logic level control with external pin
• Stable with ceramic output capacitor
• 2 LDO Outputs – 300mA each
• Integrated Power-on Reset (POR) with adjustable
delay time
• Tiny 3mm x 3mm MLF™-10 package
• Low dropout voltage of 60mV @ 150mA
• Ultra-low quiescent current of 28µA total in Full
Current Mode
• High output accuracy
- ±1.0% initial accuracy
- ±2.0% over temperature
• Thermal Shutdown Protection
• Current Limit Protection
Applications
• Cellular/PCS phones
• Wireless modems
• PDAs
• MP3 Players
Typical Application
V_IN
EN1
EN2
LOWQ
BYP
GND
V_OUT1
V_OUT2
POR
SET
V_CORE
V_I/O
Baseband
µProcessor
MIC5312-xxBML
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2005
M9999-021105
[phone]