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PDF MIC2800 Data sheet ( Hoja de datos )
| Número de pieza | MIC2800 | |
| Descripción | Digital Power Management IC | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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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
90
3V
3.6V
85 4.2V
80
75
70
65
60 L = 2.2µH
55
500
COUT = 2.2µF
/LowQ = VIN
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
1 page  
Micrel, Inc.
MIC2800
Electrical Characteristics - DC/DC Converter
VIN = VOUTDC/DC + 1; EN1 = VIN; EN2 = GND; IOUTDC/DC = 100mA ;L = 2.2µH; COUTDC/DC = 2.2µF; TJ = 25°C, bold values
indicate –40°C to + 125°C; unless noted.
Parameter
Conditions
Min Typ Max Units
LOWQ = High (Full Power Mode)
Fixed Output Voltages
Nominal VOUT tolerance
Current Limit in PWM Mode
FB pin input current (ADJ only)
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
PWM Switch ON-Resistance
Oscillator Frequency
VFB = 0.9*VNOM
VOUT > 2.4V; VIN = VOUT + 300mV to 5.5V, ILOAD= 100mA
VOUT < 2.4V; VIN = 2.7V to 5.5V, ILOAD= 100mA
20mA < ILOAD < 300mA
VFB ≤ 0.4V
ISW = 150mA VFB = 0.7VFB_NOM
ISW = -150mA VFB = 1.1VFB_NOM
-2 +2 %
-3 +3 %
0.75 1
1.6
A
1 5 nA
0.2 %/V
%/V
0.2 1.5
%
100 %
0.6 Ω
0.8 Ω
1.8 2
2.2 MHz
Output Voltage Noise
COUT = 2.2µF; CBYP = 0.1µF; 10Hz to 100KHz
60 µVRMS
LOWQ = Low (Light Load Mode)
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT; -40°C to +125°C
Output Voltage Temp.
Coefficient
Line Regulation
VIN = VOUT + 1V to 5.5V; IOUT = 100µA
Load Regulation
Ripple Rejection
Current Limit
IOUT = 100µA to 50mA
f = up to 1kHz; COUT = 2.2µF; CBYP = 0.1µF
f = 20kHz; COUT = 2.2µF; CBYP = 0.1µF
VOUT = 0V
-2.0 +2.0 %
-3.0 +3.0 %
40 ppm/C
0.02 0.3
0.6
0.2 1.5
55
45
80 120 190
%/V
%/V
%
dB
dB
mA
September 2007
5 M9999-090507-C
5 Page 
Micrel, Inc.
Functional Characteristics
DC/DC Load Transient PWM Mode
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 2.2µF
CBYP = 0.01µF
/LowQ = VIN
400mA
10mA
Time (20µs/div)
Enable Transient PWM Mode
Time (40µs/div)
VIN = 3.6V
VOUT = 1.8V
COUT = 2.2µF
CBYP = 0.01µF
/LowQ = VIN
IOUT = 300mA
MIC2800
DC/DC Line Transient PWM Mode
VIN = VOUT + 1V
VOUT = 1.87V
COUT = 2.2µF
CBYP = 0.01µF
/LowQ = VIN
IOUT = 100mA
Time (20µs/div)
September 2007
11 M9999-090507-C
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MIC2800.PDF ] | |
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