MIC5338/9 Evaluation Board

MIC5338/9 Evaluation Board
Dual 300mA μCap LDO in
1.6mm x 1.6mm Thin MLF®
General Description
The MIC5338/9 is an advanced, dual LDO ideal for
powering general purpose portable devices. The
MIC5338/9 provides two independently controlled, high
performance 300mA LDOs in a tiny 1.6mm x 1.6mm Thin
MLF® package. When the MIC5339 is disabled an internal
resistive load is automatically applied to the output to
discharge the output capacitor.
Ideal for battery powered applications, the MIC5338/9
offers two low noise outputs and low quiescent current of
70μA when both outputs are enabled.
An input capacitor may be required when the power supply
is more than four inches from the device. The evaluation
board includes an input capacitor of 10μF to compensate
for long inductive test leads.
Requirements
The MIC5338/9 evaluation board requires an input power
supply that is able to deliver at least 650mA at a voltage
within the range of 2.5V 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.
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 (2.5V ≤ VIN ≤
5.5V). An ammeter may be placed between the input
supply and the VIN terminal of the evaluation board.
Ensure that the supply voltage is monitored at the VIN
terminal. The ammeter and power lead resistance can
reduce the voltage supplied to the input.
2. Enable/Disable the MIC5338/9. The evaluation board
is configured for “Default Disable” with 100KΩ pull
down resistors on the enable pins to GND. To enable
the MIC5338/9 jumper the enable terminal (J7 for
LDO1 and J8 for LDO2) to VIN. To disable the output,
simply remove the jumper from the EN terminal. The
enable pin must be either pulled high or low for proper
operation. Removing the pull-down resistors and
leaving the pins floating will cause the regulators to
operate in an indeterminate state.
3. Connect the Load to the VOUT Terminals. Connect a
load to the output of LDO1 (J3) and GND (J6).
Connect a load to the output of LDO2 (J5) and GND
(J4). The load can be either a passive (resistor) or
active (electronic load). Be sure to monitor the output
voltage at the VOUT (J3, J5) terminals.
Ordering Information
Part Number
Description
MIC5338-MGYMT EV
Dual 300mA LDO Regulator
Evaluation Board VOUT1 = 2.8V,
VOUT2 = 1.8V
MIC5339-MGYMT EV
Dual 300mA LDO Regulator with
Auto Discharge Evaluation Board
VOUT1 = 2.8V, VOUT2 = 1.8V
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
September 2010
M9999-092410-A
Micrel, Inc.
MIC5338/9 Evaluation Board
MIC5338/9 Evaluation Board Schematic
Bill of Materials
Item
Part Number
Manufacturer
Description
Qty.
C1
C1608X5R0J106K
10µF Ceramic, 6.3V, X5R, Size 0603 Capacitor
1
C2, C3
GRM188R60J225KE19D
Murata(1)
1µF Ceramic, 10V, X5R, Size 0402 Capacitor
2
R1, R2
CRCW04021003KFKEA
Vishay(3)
100KΩ,1/16W, Size 0402 Resistor
MIC5338-XXYMT
U1
MIC5339-XXYMT
TDK
(2)
Micrel
Micrel
(4)
(4)
Dual, 300mA LDO, 1.6mm x 1.6mm Thin MLF
2
®
Dual, 300mA LDO with Auto Discharge, 1.6mm x
1.6mm Thin MLF®
1
Notes:
1.
Murata: www.murata.com.
2.
TDK: www.tdk.com.
3.
Vishay: www.vishay.com.
4.
Micrel, Inc.: www.micrel.com.
September 2010
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M9999-092410-A
Micrel, Inc.
MIC5338/9 Evaluation Board
PCB Layout Recommendations
Top Layer
Bottom Layer
September 2010
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M9999-092410-A
Micrel, Inc.
MIC5338/9 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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
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.
© 2010 Micrel, Incorporated.
September 2010
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M9999-092410-A