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PDF MIC23201 Data sheet ( Hoja de datos )
| Número de pieza | MIC23201 | |
| Descripción | 2MHz PWM 2A Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC23201
2MHz PWM 2A Buck Regulator with
Hyper Speed Control™
General Description
The MIC23201 is a high efficiency 2MHz 2A synchronous
buck regulator with Hyper Speed Control. Micrel’s Hyper
Speed Control provides ultra-fast transient response which
is perfectly suited for supplying processor core voltages.
An additional benefit of this proprietary architecture is very
low output ripple voltage throughout the entire load range
with the use of small output capacitors. The tiny 3mm x
3mm MLF® package saves precious board space and
requires only three external components.
The MIC23201 is designed for use with a very small
inductor, down to 1µH, and an output capacitor as small as
22µF that enables a total solution size, less than 1.5mm
height.
The MIC23201 provides a constant switching frequency
around 2MHz while achieving peak efficiencies up to 90%.
The MIC23201 is available in 10-pin 3mm x 3mm MLF
package with an operating junction temperature range
from –40C to +125C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
Input voltage: 2.7V to 5.5V
2A output current
Up to 90% peak efficiency
Programmable Soft-Start
Power Good Indicator
2MHz switching frequency
Safe for pre-biased output
Ultra fast transient response
Low voltage output ripple, 16mV at full load
Fully integrated MOSFET switches
0.01µA shutdown current
Thermal shutdown and current limit protection
Output Voltage as low as 0.95V
10-pin 3mm x 3mm MLF
–40C to +125C operating junction temperature range
Applications
Low Voltage Point of Load
Blu Ray DVD Players
Networking Equipment
Set Top Boxes
____________________________________________________________________________________________________________
Typical Application
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency (VIN = 3.3V)
vs. Output Current
2.5V
1.8V
1.5V
1.2V
0.95V
VIN = 3.3V
0.6 1.2 1.8 2.4
OUTPUT CURRENT (A)
3
Hyper Speed Control is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark 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
August 2012
M9999-082912-A
1 page  
Micrel Inc.
Typical Characteristics (Continued)
VIN Operating Supply Current
vs. Temperature
50
VIN =3.3V
40 VOUT = 1.8V
IOUT = 0A
SWITCHING
30
20
10
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
Feedback Voltage
vs. Temperature
0.640
0.632
0.624
0.616
0.608
0.600
-50
VIN = 3.3V
VOUT = 1.8V
IOUT = 0A
-25 0 25 50 75 100 125
TEMPERATURE (°C)
3000
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
-50
Switching Frequency
vs. Temperature
VIN = 3.3V
VOUT = 1.8V
IOUT = 0A
-25 0 25 50 75 100 125
TEMPERATURE (°C)
10
9
8
7
6
5
4
3
2
1
0
-50
VIN Shutdown Current
vs. Temperature
VIN = 3.3V
IOUT = 0A
VEN/DLY = 0V
-25 0 25 50 75 100
TEMPERATURE (°C)
125
2.0%
1.8%
1.6%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
-50
Load Regulation
vs. Temperature
VIN = 3.3V
VOUT = 1.8V
IOUT = 0A to 2A
-25 0 25 50 75 100 125
TEMPERATURE (°C)
Enable Threshold
vs. Temperature
1.20
VIN = 3.3V
1.10
1.00
Rising
0.90
0.80 Falling
0.70
-50
-25 0 25 50 75
TEMPERATURE (°C)
100 125
MIC23201
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
-50
VIN UVLO Threshold
vs. Temperature
Rising
Falling
-25 0 25 50 75 100
TEMPERATURE (°C)
125
0.50%
0.00%
Line Regulation
vs. Temperature
VIN = 2.7V to 5.5V
VOUT = 1.8V
-0.50%
-1.00%
-1.50%
-2.00%
-50
-25 0 25 50 75 100
TEMPERATURE (°C)
125
Current Limit
vs. Temperature
10
8
6
4
2 VIN = 3.3V
VOUT = 1.8V
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
August 2012
5 M9999-082912-A
5 Page 
Micrel Inc.
Functional Diagram
MIC23201
Figure 1. Simplified MIC23201 Functional Block Diagram
Functional Description
VIN
The input supply (VIN) provides power to the internal
MOSFETs for the switch mode regulator along with the
internal control circuitry. The VIN operating range is 2.7V
to 5.5V so an input capacitor, with a minimum voltage
rating of 6.3V, is recommended. Due to the high
switching speed, 22µF bypass capacitor placed close to
VIN and the power ground (PGND) pin is required. Refer
to the layout recommendations for details.
SVIN
The input supply (SVIN) provides power to internal
control circuitry. This pin is connected externally to the
VIN pin. A 2.2µF ceramic capacitor from the SVIN pin to
AGND must be placed next to the IC.
EN
A logic high signal on the enable pin activates the output
voltage of the device. A logic low signal on the enable
pin deactivates the output and reduces supply current to
0.01µA. MIC23201 features built-in soft-start circuitry
that reduces in-rush current and prevents the output
voltage from overshooting at start up. Do not leave this
pin floating.
SW
The switch (SW) connects directly to one end of the
inductor and provides the current path during switching
cycles. The other end of the inductor is connected to the
load, SNS pin and output capacitor. Due to the high
speed switching on this pin, the switch node should be
routed away from sensitive nodes whenever possible.
SS
The soft start (SS) pin is used to control the output
voltage ramp up time. The approximate equation for the
ramp time in seconds is 270x103 x ln(10) x CSS. For
example, for a CSS = 470pF, Trise ~ 300µs. See the
Typical Characteristics curve for a graphical guide. The
minimum recommended value for CSS is 100pF.
SNS
The sense (SNS) pin is connected to the output of the
device to provide feedback to the control circuitry. The
August 2012
11 M9999-082912-A
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MIC23201.PDF ] | |
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