Microchip MIC23050-4YML Handleiding

Microchip Niet gecategoriseerd MIC23050-4YML

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MIC2 Evaluation Board 3050
4MHz PWM Buck Regulator
with HyperLight Load®
HyperLight Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 0800 • fax + 1 (408) 474 1000 • http://www.micrel.com408) 944- -
March , 2014 24
1
Revision 3.0
General Description
Micrel MIC23050 is a 500mA 4MHz switching regulator ’s
with HyperLight Load® mode. The MIC23050 is highly
ecient throughout the load range and only draws 20µA of
quiescent current. Sub-1mm solution is easily obtainable
using the tiny package (2mm x 2mm x 0.85mm)
MIC23050, which only requires four external components.
Small and fast, the MIC23050 can respond to a load
transient at ultra fast speed while reducing output peak- -to
peak voltage.
The MIC23050 has two modes of operation that is
automatically selected by the internal circuitry. Under light
load conditions from 1mA to 50mA, the MIC23050 goes
into HyperLight Load mode. The MIC23050 HyperLight
Load uses a Pulse-Frequency Modulation (PFM) control
scheme that controls the o time at light load and keeps
constant switching frequency in continuous mode. This
allows the device to reduce the amount of switching
needed at light loads, thus reducing the switching losses.
The MIC23050 can attain 85% eiciency at 1mA output
load. When the load is more than 50mA, HyperLight Load
automatically switches back to Pulse-Width Modulation
(PWM) mode to ensure high eciency at higher loads. The
two modes of operation ensure that the MIC23050
maintains the highest eciency throughout the load ran ge.
The MIC23050 operates from a 2.7V to 5.5V input and
features internal power MOSFETs that can supply up to
500mA of output current. It can operate with a maximum
duty cycle of 90%.
Requirements
The MIC23050 evaluation board requires an input power
source that is able to deliver greater than 650mA at 2.7V.
The output load can either be an active or passive source.
Getting Started
1. Connect an external supply to the VIN (J1)
terminal. Apply desired input voltage to the VIN
(J1) and ground (J2 and J4) terminals of the
evaluation board, paying careful attention to
polarity and supply voltage (2.7V ≤ VIN ≤ 5.5V). An
ammeter may be placed between the input supply
and the VIN (J1) terminal to the evaluation board.
Be sure to monitor that supply voltage at the VIN
(J1) terminal. The ammeter and/or power lead
resistance can reduce the voltage supplied to the
input.
2. Connect a load to the VO (J3) output and
ground terminal. The load can be either passive
(resistive) or active (electronic load). An ammeter
can be placed between the load and the output
terminal. Ensure that the output voltage is
monitored at the VO (J3) terminal.
3. . Apply a 1.2V or greater Enable the MIC23050
voltage source to the enable pin (EN). Be sure that
the enable voltage do not exceed the input es
voltage by more than 0.5 V.
Output Voltage
The MIC23050 evaluation board four xed voltage has
options available.
Ordering Information
Part Number
MIC23050-CYML EV
MIC23050-4YML EV
MIC23050-GYML EV
MIC23050-SYML EV
Micrel, Inc.
MIC23050 Evaluation Board
March , 201424
2
Revision 3.0
HyperLight Load Mode
MIC23050 uses a minimum on and o time proprietary
control loop. When the output voltage falls below the
regulation threshold, the error comparator begins a
switching cycle that turns the PMOS on and keeps it on
for the duration of the minimum- -time. When the on
output voltage is over the regulation threshold, the error
comparator turns the PMOS o for a minimum-o-time.
The NMOS acts as an ideal rectier that conducts when
the PMOS is o. Using a NMOS switch instead of a
diode allows for lower voltage drop across the switching
device when it is on. The asynchronous switching
combination between the PMOS and the NMOS allows
the control loop to work in discontinuous mode for light
load operations. In discontinuous mode MIC23050 works
in pulse frequency modulation (PFM) to regulate the
output. As the output current increases, the switching
frequency increases. This improves the eciency of
MIC23050 during light load currents. As the load current
increases, the MIC23050 goes into continuous
conduction mode (CCM) at a constant frequency of
4MHz. The equation to calculate the load when the
MIC23050 goes into continuous conduction mode may
be approximated by the following formula:
f2L
D)V(V
IOUTIN
LOAD
Micrel, Inc.
MIC23050 Evaluation Board
March , 201424
3
Revision 3.0
MIC23050 Typical Circuit (1.8V)
Bill of Materials
Item
Part Number
Manufacturer
Description
Qty
C1, C2
C1608X5R0J476K
TDK(1)
4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603
2
C3
C1005X5R0J476K
Murata(2)
560pF Ceramic Capacitor, 6.3V, X5R, Size 0402
1
L1
LQM21PN1R0M 00
Murata(2)
1µH, 0.8A, 2mm x W1.25mm x H0 190mΩ, L .5mm
1
LQH32CNR1R0M33
Murata(2)
1µH, 1A, 60mΩ, L3.2mm x W2.5mm x H2.0mm
LQM31P1R0M00
Murata(2)
1µH, 1.2A, 120mΩ, L3.2mm x W1.6mm x H0.95mm
GFL251812T
TDK(1)
1µH, 0.8A, 100mΩ, L2.5mm x W1.8mm x H1.35mm
LQM31PNR47M00
Murata(2)
0.47µH, 1.4A, 80mΩ, L3.2mm x W1.6mm x H0.85mm
MIPF2520D1R5
FDK(3)
1.5µH, 1.5A, 70mΩ, L2.5mm x W2mm x H1.0mm
U1
MIC23050-GYML
Micrel, Inc. (4)
4MHz PWM Buck Regulator with HyperLight Load Mode
1
Notes:
1. TDK: www.tdk.com
2. Murata: www.murata.com
3. FDK: www.fdk.co.jp
4. Micrel, Inc: www.micrel.com

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC23050-4YML

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