11. For higher current applications, it is recommended to use the larger inductor specified.
Manufacturer
TDK
(1)
Murata
(2)
Samsung
TDK
Murata
Samsung
TDK
Samsung
AVX
Samsung
Taiyo Yuden
AVX
TDK
Murata
Samsung
AVX
(5)
(6)
(4)
(3)
Description
Capacitor, 2.2µF, 16V, X5R, 0603 size
Capacitor, 2.2µF, 16V, X5R, 0603 size
Capacitor, 2.2µF, 16V, X5R, 0603 size
Capacitor, 0.1µF, 16V, X7R, 0603 size
Capacitor, 0.1µF, 16V, X7R, 0603 size
Capacitor, 0.1µF, 16V, X7R, 0603 size
Capacitor, 10nF, 50V, X5R, 0603 size
Capacitor, 10nF, 50V, X5R, 0603 size
Capacitor, 10nF, 50V, X5R, 0603 size
Capacitor, 22µF, 10V, X5R, 0805 size
Capacitor, 22µF, 10V, X5R, 0805 size
Capacitor, 100µF, 16V, D case size
Capacitor, 100pF, 50V, C0G, 0603 size
Capacitor, 100pF, 50V, C0G, 0603 size
Capacitor, 100pF, 50V, C0G, 0603 size
Capacitor, 100pF, 50V, C0G, 0603 size
Schottky Diode, 3A, 40V
Schottky Diode, 3A, 20V
Schottky Diode, 3A, 40V
Inductor, 2.2µH, 3.4A, 5.2 x 5.0 x 2.2mm
Inductor, 2,2µH, 5.4A, 6.8 x 7.3 x 3.2mm
(11)
Inductor, 2.2µH, 3.56A, 6.0 x 7.1 x 2.4mm
(11)
Resistor, 10kΩ, 1%, 1/16W, 0603 size
Resistor, 620Ω, 1%, 1/16W, 0603 size
Resistor, 0Ω, 1%, 1/16W, 0603 size
Resistor, 100kΩ, 1%, 1/16W, 0603 size
Resistor, 30.9kΩ, 1%, 1/16W, 0603 size
1MHz High Power and High Efficiency Boost Regulator
Qty.
1
1
1
1
1
1
Central
MCC
MCC
TDK
TDK
(7)
1
1
1
1
1
1
1
1
Coilcraft
(8)
Vishay
(9)
Vishay
Vishay
Vishay
Vishay
Micrel, Inc.
(10)
CRCW06031002FRTI
CRCW06036200FRTI
CRCW06030000FKEA
CRCW06031003FRTI
CRCW06033092FRTI
MIC2253-06YML
March 2010
3
M9999-030310-A
Micrel, Inc.
MIC2253 Evaluation Board
PCB Layout Recommendations
Top Layer
Bottom Layer
March 2010
4
M9999-030310-A
Micrel, Inc.
MIC2253 Evaluation Board
Additional Information
Ripple Measurements
To properly measure voltage ripple on either the input or
output of any regulator with a switching regulator near
by, a proper ring in tip measurement is
required. Standard oscilliscope probes
come with a grounding clip, or a long
wire with an alligator clip. Unfortunately,
for high frequency measurements, this
ground clip can pick up high frequency
noise and erroneously inject it into the
measured output ripple.
The
MIC2253
evaluation
boards
accommodate a home made ring in tip
measurement by probing across input
and output capacitors. This requires the
removing of the oscilloscope probe
sheath and ground clip from a standard
oscilloscope probe and wrapping a non-
shielded
bus
wire
around
the
oscilloscope probe (as shown on the
left). If there does not happen to be any
non-shielded bus wire immediately available, the leads
from axial resistors will work. By maintaining the
shortest possible ground lengths on the oscilloscope
probe, true ripple measurements can be obtained.
Over-Voltage Protection (OVP)
The MIC2253 provides a fixed 5.6V overvoltage
protection. The overvoltage functionality will clamp the
output voltage to a safe level (5.6V) in the event that a
fault condition causes the output voltage to increase
beyond control or the OVP pin exceeds 5.6V. To ensure
the highest level of protection, the MIC2253 OVP pin will
shut the switch off when an overvoltage condition is
detected and regulates to the OVP set point. The OVP
set point should be set below the rating of the output
capacitor to ensure protection. Two external resistors
can be used to change the OVP from the range of 5.7V
to 30V. Be careful not to exceed the 30V rating of the
switch. The OVP feature may be disabled by grounding
the OVP pin.
The OVP pin is connected internally to a reference
voltage via a voltage divider circuit. For a 5.6V OVP
setting, connect the OVP pin directly to the output
voltage with a 0Ω resistor at R3. To increase the OVP
voltage above 5.6V, replace the R3 and R6 resistor
values on the evaluation board with the calculated
values using the following equation:
V
OVP
=
1.245
×
67
k
×
(
R
3
+
R
6
)
(15
k
×
R
6)
R3 (kΩ)
13.0
23.7
34.8
51.1
66.5
78.7
105
130
R6 (kΩ)
30.1
30.1
30.1
30.1
30.1
30.1
30.1
30.1
V
OVP
(V)
8.0
10
12
15
18
20
25
30
Table 1. OVP Example Resistor Values
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into
2010
M9999-030310-A
March
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
5
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
据外媒报道，萨里大学（University of Surrey）的研究人员开发出一种无需依赖GPS即可在人口密集的城市地区精确定位设备位置的人工智能系统。该系统可将定位误差从734米缩小到22米以内，这对于自动驾驶汽车和救援车辆等技术的发展意义重大。 图片来源： 萨里大学 在发表于《IEEE Robotics and Automation Letters》的论文中，研究人员介绍了PEn...[详细]
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