MIC38300 Evaluation Board
3A HELDO™
High Efficiency Low Dropout
Regulator
General Description
The MIC38300 is a 3A peak, 2.2A continuous current
step down converter and the first device in a new
generation of HELDO™ (High Efficiency Low Dropout)
regulators providing the benefits of LDOs in respect to
ease of use, fast transient performance, high PSRR and
low noise while offering the efficiency of a switching
regulator.
Requirements
The MIC38300 Evaluation board requires an input power
supply able to provide greater than 3A at 3V.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V
IN
(J1)
terminal may damage the device.
The MIC38300 evaluation board is tailored for a low
voltage input supply range. It should not exceed 5.5V on
the input.
Getting Started
Connect an external supply to V
IN
. Apply desired input
voltage to the V
IN
(J1) and ground (J2 and J6) terminals
of the evaluation board, paying careful attention to
polarity and supply voltage (3.0V
≤
V
IN
≤
5.5V). An
ammeter may be placed between the input supply and
the V
IN
terminal to the evaluation board. Ensure that the
supply voltage is monitored at the V
IN
terminal. The
ammeter and/or power lead resistance can reduce the
voltage supplied to the input.
Revisions
There are two revisions of the MIC38300 Evaluation
Board. The new, second revision, of the MIC38300
evaluation board has the label “BD#070507” on the
lower left hand corner of the back side. The first revision
has the label “040507 MAJ” located at the same corner.
Ordering Information
Part Number
MIC38300HYHL EV
Description
Evaluation board with
MIC38300HYHL adjustable device.
____________________________________________________________________________________________________________
Evaluation Board Schematic Revision 2 (BD#070507)
October 2008
M9999-102708-B
Micrel, Inc.
MIC38300 Evaluation Board
Bill of Materials Revision 2 (BD#070507)
Item
Part Number
06036D106KMAT2A
C1, C3, C4,
C14, C23
JMK107BJ106MA-T
C1608X5R0J106K
GRM188R60J106M
C1608X5R0J105K
C2
06036D105KAT2A
GRM188R60J105KE19D
VJ0603G105KXYAT
R1
R2, R4
R3
U1
Notes:
1. AVX: www.avx.com
2. Murata: www.murata.com
3. TDK: www.tdk.com
4. Vishay: www.vishay.com
5. Taiyo Yuden: www.t-yuden.com
6. Micrel, Inc.: www.micrel.com
Manufacturer
AVX
(1)
Taiyo Yuden
(5)
TDK
(3)
Murata
(2)
TDK
(3)
AVX
(1)
Murata
(2)
Vishay
(4)
Vishay
(4)
Vishay
(4)
Vishay
(4)
Micrel, Inc.
(6)
Description
Qty.
10uF, 6.3V X5R Ceramic Capacitor
1
10uF, 6.3V X5R Ceramic Capacitor
1
CRCW06038061FRT1
CRCW06031002KEYE3
CRCW06032492FRT1
MIC38300-HYHL
8k, 1%, 1/10W, 0603
10k, 1%, 1/10W, 0603
24.9k, 1%, 1/10W, 0603
28-Pin 4mm x 6mm MLF
®
1
2
1
1
October 2008
M9999-102708-B
Micrel, Inc.
MIC38300 Evaluation Board
Evaluation Board Revision 1 (040507 MAJ) Schematic
Bill of Materials Revision 1 (040507 MAJ)
Item
Part Number
06036D106KMAT2A
C1, C3, C4
JMK107BJ106MA-T
C1608X5R0J106K
GRM188R60J106M
C1608X5R0J105K
C2
06036D105KAT2A
GRM188R60J105KE19D
VJ0603G105KXYAT
R1
R2, R4
R3
U1
Notes:
1. AVX: www.avx.com
2. Murata: www.murata.com
3. TDK: www.tdk.com
4. Vishay: www.vishay.com
5. Taiyo Yuden: www.t-yuden.com
6. Micrel, Inc.: www.micrel.com
Manufacturer
AVX
(1)
Taiyo Yuden
(5)
TDK
(3)
Murata
(2)
TDK
(3)
AVX
(1)
Murata
(2)
Vishay
(4)
Vishay
(4)
Vishay
(4)
Vishay
(4)
Micrel, Inc.
(6)
Description
Qty.
10uF, 6.3V X5R Ceramic Capacitor
1
10uF, 6.3V X5R Ceramic Capacitor
1
CRCW06038061FRT1
CRCW06031002KEYE3
CRCW06032492FRT1
MIC38300-HYHL
8k, 1%, 1/10W, 0603
10k, 1%, 1/10W, 0603
24.9k, 1%, 1/10W, 0603
28-Pin 4mm x 6mm MLF
®
1
2
1
1
October 2008
M9999-102708-B
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