MIC5335 Evaluation Board

MIC5335 Evaluation Board
High Performance Dual 300mA
µCap ULDO™
General Description
The MIC5335 is a high current, tiny dual output, ultra low
dropout linear regulators. The MIC5335 regulator provides
two independent enable pins, to disable each output
separately. The MIC5335 provides two high performance
300mA LDOs in a tiny 6 pin 1.6mm x 1.6mm Thin MLF®
package.
The MIC5335 dual Ultra Low Dropout (ULDO™) linear
regulator is easy to use. A small output capacitance of only
1µF for each of the outputs is required.
An input capacitor may be required when the power supply
is more than 4-inches away from the device. The
evaluation board includes an input capacitor of 10µF to
compensate for long inductive test leads.
Getting Started
1. Connect an external supply to VIN. Apply the
desired input voltage to the VIN (J1) and ground
terminal (J2) of the evaluation board, paying
careful attention to polarity and supply voltage
(2.3V ≤ VIN ≤ 5.5V). An ammeter may be placed
between the input supply and the VIN terminal to
the evaluation board to accurately monitor the
input current. The ammeter and/or power lead
resistance can reduce the voltage supplied to the
input so monitor the supply voltage at the VIN
terminal.
2. Enable/Disable the MIC5335. The evaluation
board is set up for “Default Enable” on both
outputs with a 10k pull up resistor on each of the
enable pins (EN1 and EN2) to VIN. To disable an
output, simply jumper the EN terminal (J7 for
LDO1, J3 for LDO2) to the GND terminal (J2 or
J5). The enable pins must be either pulled high or
low for proper operation. Removing the pull up
resistors and leaving the pins floating will cause
the regulators to operate in an indeterminate state.
Requirements
The MIC5335 evaluation board requires an input power
source that is able to deliver at least 600mA at a voltage
within the range of 2.3V to 5.5V. The output load can be
either active or passive.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the VIN terminal
may damage the device.
The evaluation board is tailored for a Li-Ion range input
supply voltage. It should not exceed 5.5V on the input.
3. Connect the loads to the VOUT terminals (J4 for
LDO1, J6 for LDO2) and ground terminal (J5).
The load can be either a passive (resistor) or
active (electronic load). Be sure to monitor the
output voltage at the VOUT (J4 and J6) terminals.
Ordering Information
Part Number
Description
MIC5335-XXYMT EV
Evaluation board with the 300mA Dual
ULDO™ device
ULDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of 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
March 2008
M9999-032708-A
Micrel, Inc.
MIC5335 Evaluation Board
Evaluation Board Schematic
U1
MIC5335-xxYMT
VIN
J1
VIN
1
R2
10k
VIN
VOUT1
6
J4
VOUT1
5
J6
VOUT2
R1
10k
VOUT2
J3
EN2
3
J7
EN1
4
EN2
EN1
GND
C1
10µF
C2
1µF
2
C3
1µF
J2
GND
J5
GND
Bill of Materials
Item
C1
Part Number
C1608X5R0J106M
Manufacturer
TDK
(1)
(1)
C2, C3
C1608X5R0J105M
TDK
R1, R2
CRCW06031002FKEYE3
Vishay
U1
MIC5335-XXYMT
Micrel
(2)
(3)
Description
Qty
Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603
1
Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603
2
Resistor, 10kΩ, 1%, 1/16W, Size 0603
2
®
UCAP LDO, Dual 300mA, Size 1.6mm x 1.6mm Thin MLF
1
Notes:
1.
TDK: www.tdk.com
2.
Vishay: www.vishay.com
3.
Micrel, Inc.: www.micrel.com
March 2008
2
M9999-032708-A
Micrel, Inc.
MIC5335 Evaluation Board
PCB Layout Recommendations
Top Layer
Bottom Layer
March 2008
3
M9999-032708-A
Micrel, Inc.
MIC5335 Evaluation Board
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 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
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.
© 2008 Micrel, Incorporated.
March 2008
4
M9999-032708-A