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PDF MIC23153 Data sheet ( Hoja de datos )
| Número de pieza | MIC23153 | |
| Descripción | 4MHz PWM 2A Buck Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC23153
4MHz PWM 2A Buck Regulator with
HyperLight Load™ and Power Good
General Description
Features
The MIC23153 is a high-efficiency, 4MHz, 2A,
synchronous buck regulator with HyperLight Load™ mode,
Power Good output indicator, and programmable soft-start.
HyperLight Load™ provides very-high efficiency at light
loads and ultra-fast transient response which makes the
MIC23153 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 2.5mm x 2.5mm Thin MLF® package
saves precious board space and requires only four
external components.
The MIC23153 is designed for use with a very-small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2 µF that enables a total solution size, less than 1mm
in height.
The MIC23153 has a very-low quiescent current of 22µA
and achieves a peak efficiency of 93% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23153 can achieve 85% efficiency at 1mA.
The MIC23153 is available in 10-pin 2.5mm x 2.5mm Thin
MLF® package with an operating junction temperature
range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Input voltage: 2.7V to 5.5V
• Output voltage: fixed or adjustable (0.62V to 3.6V)
• Up to 2A output current
• Up to 93% peak efficiency
• 85% typical efficiency at 1mA
• Power Good output
• Programmable soft-start
• 22µA typical quiescent current
• 4MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low ripple output voltage
− 35mVpp ripple in HyperLight Load™ mode
− 5mV output voltage ripple in full PWM mode
• Fully integrated MOSFET switches
• 0.01µA shutdown current
• Thermal shutdown and current-limit protection
• 10-pin 2.5mm x 2.5mm Thin MLF®
• –40°C to +125°C junction temperature range
Applications
• Solid State Drives (SSD)
• Mobile handsets
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Wireless LAN cards
• Portable applications
____________________________________________________________________________________________________________
Typical Application
Fixed Output Voltage
Adjustable Output Voltage
HyperLight Load 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
September 2011
M9999-092211-B
1 page  
Micrel Inc.
Typical Characteristics (Continued)
2.56
2.55
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
-40 -20
UVLO Threshold
vs. Temperature
UVLO_ON
UVLO_OFF
0 20 40 60 80 100 120
T EM PERAT URE (°C)
10000
1000
Switching Frequency
vs. Load Current
L = 2.2µH
100
L = 1µH
10
1
VOUT = 1.8V
0.1
0.0001 0.001 0.01 0.1 1 10
LOAD CURRENT (A)
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
2.5
Enable Threshold
v s. Input Voltage
TCASE = 25°C
3.0 3.5 4.0 4.5 5.0
INPUT VOLT AGE (V)
5.5
Feedback Voltage
vs. Temperature
0.65
0.64
0.63 VIN = 3.6V
0.62
0.61
VIN = 5.5V
VIN = 2.6V
0.60
0.59
-40 -20
0 20 40 60 80 100 120
T EM PERAT URE (°C)
MIC23153
Enable Threshold
vs. Temperature
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
-40 -20
VIN = 3.3V
0 20 40 60 80 100 120
T EM PERAT URE (°C)
September 2011
5
M9999-092211-B
5 Page 
Micrel Inc.
Application Information
The MIC23153 is a high-performance DC-to-DC step-
down regulator offering a small solution size. Supporting
an output current up to 2A inside a tiny 2.5mm x 2.5mm
Thin MLF® package, the IC requires only three external
components while meeting today’s miniature portable
electronic device needs. Using the HyperLight Load™
switching scheme, the MIC23153 is able to maintain
high efficiency throughout the entire load range while
providing ultra-fast load transient response. The
following sections provide additional device application
information.
Input Capacitor
A 2.2µF ceramic capacitor or greater should be placed
close to the VIN pin and PGND pin for bypassing. A
Murata GRM188R60J475ME84D, size 0603, 4.7µF
ceramic capacitor is recommended based upon
performance, size and cost. A X5R or X7R temperature
rating is recommended for the input capacitor. Y5V
temperature rating capacitors, aside from losing most of
their capacitance over temperature, can also become
resistive at high frequencies. This reduces their ability to
filter out high-frequency noise.
Output Capacitor
The MIC23153 is designed for use with a 2.2µF or
greater ceramic output capacitor. Increasing the output
capacitance will lower output ripple and improve load
transient response but could also increase solution size
or cost. A low equivalent series resistance (ESR)
ceramic output capacitor such as the Murata
GRM188R60J475ME84D, size 0603, 4.7µF ceramic
capacitor is recommended based upon performance,
size and cost. Both the X7R or X5R temperature rating
capacitors are recommended. The Y5V and Z5U
temperature rating capacitors are not recommended due
to their wide variation in capacitance over temperature
and increased resistance at high frequencies.
Inductor Selection
When selecting an inductor, it is important to consider
the following factors (not necessarily in the order of
importance):
• Inductance
• Rated current value
• Size requirements
• DC resistance (DCR)
The MIC23153 is designed for use with a 0.47µH to
2.2µH inductor. For faster transient response, a 0.47µH
inductor will yield the best result. For lower output ripple,
a 2.2µH inductor is recommended.
MIC23153
Maximum current ratings of the inductor are generally
given in two methods; permissible DC current and
saturation current. Permissible DC current can be rated
either for a 40°C temperature rise or a 10% to 20% loss
in inductance. Ensure the inductor selected can handle
the maximum operating current. When saturation current
is specified, make sure that there is enough margin so
that the peak current does not cause the inductor to
saturate. Peak current can be calculated as follows:
IPEAK
=
⎢⎡IOUT
⎣
+
VOUT
⎜⎜⎝⎛
1
− VOUT /VIN
2×f ×L
⎟⎟⎠⎞⎥⎦⎤
As shown by the calculation above, the peak inductor
current is inversely proportional to the switching
frequency and the inductance; the lower the switching
frequency or the inductance the higher the peak current.
As input voltage increases, the peak current also
increases.
The size of the inductor depends on the requirements of
the application. Refer to the Typical Application Circuit
and Bill of Materials for details.
DC resistance (DCR) is also important. While DCR is
inversely proportional to size, DCR can represent a
significant efficiency loss. Refer to the Efficiency
Considerations.
The transition between high loads (CCM) to Hyperlight
load (HLL) mode is determined by the inductor ripple
current and the load current.
The diagram shows the signals for high side switch drive
(HSD) for TON control, the inductor current and the low
side switch drive (LSD) for TOFF control.
September 2011
11
M9999-092211-B
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MIC23153.PDF ] | |
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