MIC2800-1.8/1.2/2.5YML データシートの表示（PDF） - Micrel
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MIC2800-1.8/1.2/2.5YML Datasheet PDF : 20 Pages
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MIC2800
Digital Power Management IC
2MHz, 600mA DC/DC w/Dual
300mA/300mA Low VIN LDOs
General Description
The MIC2800 is a high performance power management
IC, giving three output voltages with maximum efficiency.
Integrating a 2MHz DC/DC converter with an LDO post
regulator, the MIC2800 gives two high efficiency outputs
with a second, 300mA LDO for maximum flexibility. The
MIC2800 features a LOWQ® mode, reducing the total
current draw while in this mode to less than 30µA. In
LOWQ® mode, the output noise of the DC to DC converter
is 75µVRMS, significantly lower than other converters which
use a PFM light load mode that can interfere with sensitive
RF circuitry.
The DC to DC converter uses small values of L and C to
reduce board space but still retains efficiencies over 90%
at load currents up to 600mA.
The MIC2800 is a µCap design, operating with very small
ceramic output capacitors and inductors for stability,
reducing required board space and component cost and it
is available in fixed output voltages in the 16-pin
3mm x 3mm MLF® leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• 2.7V to 5.5V input voltage range
• 2MHz DC/DC converter and two stand-alone LDOs
– LDO1: Low input voltage is powered directly from
DC/DC converter for highest efficiency
• Integrated power-on reset (OR function for all outputs)
– Adjustable delay time
• LOWQ® mode
– 30µA Total IQ when in LOWQ® mode
• Tiny 16-pin 3mm x 3mm MLF® package
DC to DC Converter
• Output current to 600mA in PWM mode
• LOWQ® Mode: NO NOISE Light load mode
– 75µVRMS output noise in LOWQ® mode
• 2MHz PWM operation in normal mode
• >90% efficiency
LDOs
• LDO1 input voltage directly connected to DC/DC
converter output voltage for maximum efficiency
– Ideal for 1.8V to 1.5V conversion
– 300mA output current from 1.8V input
– Output voltage down to 0.8V
• LDO2 – 300mA output current capable
• Thermal Shutdown Protection
• Current Limit Protection
Applications
• Mobile phones
• PDAs
• GPS receivers
• Digital still cameras
• Portable media players
Typical Application
VIN
2.7V to 5.5V
4.7µF/
6.3V
GND
CBYP
0.01µF
MIC2800-xxxYML
VIN
VIN
EN1
LOWQ
EN2
CBYP
CBIAS
PGND
CBIAS
0.1µF
LDO
SW
FB
2.2µH
LDO1
LDO2
POR
CSET
SGND
CSET
0.01µF
COUT2
2.2µF
ceramic
VOUT
2.2µF
ceramic
COUT1
2.2µF
ceramic
Memory/DSP
Baseband
GND
DC/DC 1.8VOUT Efficiency
100
95
3V
90
3.6V
85
4.2V
80
75
70
65
60
L = 2.2µH
55
COUT = 2.2µF
50
/LowQ = VIN
0 100 200 300 400 500 600
OUTPUT CURRENT (mA)
LOWQ is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2007
M9999-090507-C
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