MIC28500 2A EV Micrel, MIC28500 2A EV Datasheet

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MIC28500 2A EV

Manufacturer Part Number
MIC28500 2A EV
Description
Power Management IC Development Tools 75V/4A DC-DC Buck Regulator with HSC - Evaluation Board
Manufacturer
Micrel
Type
DC/DC Converters, Regulators & Controllersr
Datasheet
1.MIC28500_2A_EV.pdf (14 pages)

Specifications of MIC28500 2A EV

Product
Evaluation Boards
Tool Is For Evaluation Of
MIC28500
Input Voltage
30 V to 75 V
Output Voltage
12 V
Description/function
Evaluation Board
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Output Current
2 A
For Use With
MIC28500
General Description
The MIC28500 DC/DC regulator operates ov
supply range of 30V to 75V and provides a
output at up to 4A of output curre
adjustable down to 0.8V with a typical accuracy of
The switching frequency is adjustable and
the switching fre
changes in input voltage and output lo
The ba ic p
1. Input − 30V to 75V
2. Output − 0.8V to 5V at 4A
3. 250kHz Switching Frequency (Adjustab
Notes:
1,2.
Characteristics section.
Datasheets and support documentation can
on Micrel
Requirements
The MIC28500 evaluation board requires on
power supply with at least 10A current ca
linear regulator, which includes a Zener an
transisto
housekeeping (V
load can eith
Precautio
The MIC28500 evaluation board does
reverse polarity protection. Applying a
voltage to the PVIN and GND terminals may damage
the device. The maximum PVIN of the board is rated
at 75V. Exceeding 75V on the PVIN could damage the
device
Getting Started
1. V
Connect a supply to the Vin and GND terminals,
paying careful attention to the polarity and the supply
range (30V < V
July 2011
Hyper Speed Control is a trademark of Micrel, Inc
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
to 500kHz)
IN
Refer to thermal de-rating curves shown in Typical
Supply
s
r, has been installed on the board to p
’s web site at:
ns
arameters of the evaluation board ar
er be a passive or an active load.
IN
quency remains fairly constan
DD
< 75V). Monitor I
) for the MIC28500. The
www.micrel.c
(1)
nt. The output volt
, 12V at 2A
ad.
om
IN
.
with a current
once ad
er an
(2)
d an
le 1
pab
ly a
not
reg
be
neg
e:
00kHz
ility. A
output
rovid
ulated
t with
single
age is
justed
±1% .
found
have
input
N
ative
PN
e
MIC28500 4A Evaluation Board
meter and V
voltmeter. Do not apply power u
2. Connect Load and Monitor
Connect a load to the Vout and
load can be
(as in an
placed between the Vout termin
the output current. Ensure t
monitored at the Vout terminal.
3. V
To prevent overstressing of the
MIC28500, the minimum inpu
should be lim
using external VIN limiter circuit installed on either EN
pin (dash-line block#1) or VDD
as shown in the Evaluation bo
MIC28500 evaluation board th
Pin is installed, which shuts off
input supply voltage reaches 30
4. Enable Input
The EN pin has an internal 1
VDD, which allows th
VDD
provided on the evaluation boa
access the e
signal on the EN pin to pull it low or using a jumper to
short the EN pin to GND will shut off the output of the
MIC28500
the EN nee
circuit shou
5
T
voltage is regulated to 3.3V.
Ordering Information
Synchronous DC/DC Buck Regulator
. T
urn
Part Number
MIC28500 4A EV
MIC28500 2A EV
urn on the Power
IN
75V/4A Hyper Speed Control™
exceeds its UVLO threshold. An E
on the VIN supply a
30V Limiter Circuit
electronic load) type. A current meter may be
ds to be controlled externally the V
ld be impl
evaluation board. If in certain application
nable feature. Applying an external logic
either a passive (resistive) or an active
IN
ited to 30V. This is implemented by
at Vin and
hbwhelp@micrel.com
emented on VDD pin.
Evaluation Board up to 5V Output
e output to be turned on when
Evaluation Board 12V Output
nd verify that the output
Description
Pin (dash-line block#2)
ard schematic. On the
e limiter circuit on EN
00k pull-up resistor to
he output voltage is
the MIC28500 until the
Output
V.
ntil Step 5.
internal top FET of the
t voltage at full load
http://www.micrel.com
al and load to monitor
GND terminals with
rd for users to easily
GND terminals. The
or (408) 955-1690
N connector is
M9999-071911
IN
limiter

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MIC28500 2A EV Summary of contents

Page 1

... Power neg ative T urn on the VIN supply a voltage is regulated to 3.3V. Ordering Information Part Number MIC28500 4A EV MIC28500 2A EV with a current IN at Vin and GND terminals with IN ntil Step 5. Output GND terminals. The either a passive (resistive active electronic load) type. A current meter may be ...

Page 2

... The control loop gain can be measured by connecting an impedance analyzer across the resistor and selecting the resistor value in between Ω Ω July 2011 ⎞ ⎟ ⎟ ⎠ is one R6, R7, mmended the most critical of bottom FET. DS-ON 2 M9999-071911 hbwhelp@micrel.com or (408) 955-1690 ...

Page 3

... Thermal Derating L=10uH OUT Maximum Ambient Temperature (°C) 100 3 Thermal Derating 4 = 30V IN =250kHz 3.3V OUT OUT 100 Maximum Ambient Temperature (°C) hbwhelp@micrel.com V = 48V IN f =250kHz SW L=10uH V = 3.3V OUT 70 85 100 M9999-071911 or (408) 955-1690 ...

Page 4

... MIC28500 0.8V to 5V/4A Output Evaluation Board Schematic Figure 1. MIC28500 Evaluation board for 0.8V to 5V/4A Output July 2011 4 hbwhelp@micrel.com M9999-071911 or (408) 955-1690 ...

Page 5

... Micrel, Inc Materials 0.8V to 5V/4A O tput Item Part Number C1 EEU-FC2A101B GRM32ER72A225KA C2, C3 C3225X7R2A2 25KT5 GRM32ER60J107ME20L C13 12106D107 MAT2A 06035C104KAT2A C6 GRM188R71H104KA93D C1608X7R1H104K GRM188R72A104KA35D C10 C1608X7S2A104 K 0805ZC225MAT2A C8, C9 GRM21BR71A225KA01L C2012X7R1A22 5K GRM188R72A102KA01D C11 C1608X7R2A102K 06031C102KAT2A GRM188R71H472KA01D C12 C1608X7R2A472K 06035C 472KAT2A GRM21BR71A105KA C16 C2012X7R1A105K C4, C5, C7 ...

Page 6

... Panasonic: www.panasonic.com. 2. Murata: www.murata.com. 3. TDK: www.tdk.com. 4. AVX: www.avx.com. 5. MCC: www.mccsemi.com. 6. Diode Inc.: www.diodes.com. 7. Central Semi: www.centralsemi.com. 8. Cooper: www.cooperbussman.com. 9. Vishay: www.vishay.com 10. Micrel, Inc.: www.micrel.com. July 2011 ) u (9) V ish ay Dale 40.2kΩ Re sistor, Size 0603, 1% (9) V ish ay Dale 20kΩ Resist or, Size 0603, 1% (9) V ...

Page 7

... FR-4 PCB with 2oz. finish copper weight per layer, see Thermal Measurement section. Actual results will depend upon the size of the PCB, ambient temperature and proximity to other heat emitting components. July 2011 Thermal Derating 12V OUT f =250kHz 1.5 SW 48VIN L=33 μ 48V IN 0 75V Maximum Ambient Temperature (° 30V IN 85 100 hbwhelp@micrel.com or (408) 955-1690 M9999-071911 ...

Page 8

... MIC28500 12V/2A Output Evaluation Board Schematic July 2011 Figure 2. MIC28500 Evaluation board for 12V/2A Output 8 M9999-071911 hbwhelp@micrel.com or (408) 955-1690 ...

Page 9

... Micrel, Inc Materials 12V/2A Output Item Part Number C1 EEU-FC2A101B GRM32ER72A225KA35L C2, C3 C3225X7R2A 225K T5 GRM32ER61C476ME C13 EMK325BJ 476MM-T 06035C104KAT2A C6 GRM188R71H104KA93D C1608X7R1H104K GRM188R72A104KA35D C10 C1608X7S2A104 K 0805ZC225MAT2A C8, C9 GRM21BR71A225KA01L C2012X7R1A22 5K GRM188R72A102KA01D C11 C1608X7R2A102K 06031C102KAT2A GRM188R71H472KA01D C12 C1608X7R2A472K 06035C 472KAT2A GRM21BR71A105KA C16 C2012X7R1A105K C4, C5, C7 ...

Page 10

... TDK: www.tdk.com. 4. Taiyo Yuden: www.t-yuden.com. 5. AVX: www.avx.com. 6. MCC: www.mccsemi.com. 7. Diodes Inc.: www.diodes.com. 8. Central Semi: www.centralsemi.com. 9. Cooper: www.cooperindustries.com. 10. Vishay: www.vishay.com. 11. Micrel, Inc.: www.micrel.com. July 2011 (C ontinu ed) Manufacturer Description (10 Dale 80.6kΩ Re sistor, Size 0603, 1% (10 Dale 40.2kΩ Resi ...

Page 11

... Evaluation Board PCB Layout July 2011 MIC28500 Evaluation Board − Silkscreen Top MIC28500 Evaluation Board − Copper Layer 1 (Top) 11 M9999-071911 hbwhelp@micrel.com or (408) 955-1690 ...

Page 12

... Evaluation Board PCB Layout (Continued) July 2011 MIC28500 Evaluation Board − Copper Layer 2 MIC28500 Evaluation Board − Copper Layer 3 12 M9999-071911 hbwhelp@micrel.com or (408) 955-1690 ...

Page 13

... Evaluation Board PCB Layout (Continued) July 2011 MIC28500 Evaluation Board − Copper Layer 4 MIC28500 Evaluation Board − Silkscreen Bottom 13 M9999-071911 hbwhelp@micrel.com or (408) 955-1690 ...

Page 14

... A 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 ...

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