MIC5326/7 Evaluation Board

MIC5326/7 Evaluation Board
Low IQ Ultra Low Dropout LDO
General Description
The MIC5326/7 is a low quiescent current, low dropout
regulator designed for optimal performance in a small
space. The MIC5326 is capable of sourcing 150mA while
MIC5327 provides up to 300mA of output current.
MIC5326/7 consumes only 24µA of operating current. This
high performance LDO offers fast transient response and
good PSRR.
The MIC5326/7 is an ideal solution for battery operated
applications due to extremely low dropout voltage of
85mV at 150mA and 180mV at 300mA respectively. The
MIC5326/7 can also be put into a zero-off-mode current
state, drawing virtually no current when disabled.
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.
Requirements
The MIC5326/7 evaluation board requires an input power
supply that is able to deliver at least 400mA 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.
2. Enable/Disable the MIC5326/7. The evaluation
board is set up for “Default Enable” with a 10k pull
up resistor on enable pin (EN) to VIN. To disable
the output, simply jumper the EN terminal (J5) to
the GND terminal (J2).The enable pin must be
either pulled high or low. Removing the pull up
resistor and leaving the pin floating will cause the
regulator to operate in an indeterminate state.
3. Connect the load to the VOUT terminal (J3) and
ground terminal (J4). The load can be either a
passive (resistor) or active (electronic load). Be
sure to monitor the output voltage at the VOUT (J3)
terminal.
Ordering Information
Part Number
Description
MIC5326-2.8YMT EV
150mA Low IQ , Low dropout LDO
VOUT = 2.8V Evaluation Board
MIC5327-1.8YMT EV
300mA Low IQ , Low dropout LDO
VOUT = 1.8V Evaluation Board
MIC5327-2.8YMT EV
300mA Low IQ , Low dropout LDO
VOUT = 2.8V Evaluation Board
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 of
the evaluation board. Ensure that the supply
voltage is monitored at the VIN terminal. The
ammeter and/or power lead resistance can reduce
the voltage supplied to the input.
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
December 2008
M9999-120508-A
Micrel, Inc.
MIC5326/7 Evaluation Board
Evaluation Board Schematic
U1
MIC5326/7-xxYMT
J1
VIN
J5
EN
1
C1
10µF/6.3V
VIN
VOUT
R1
10k
3
EN
GND
J3
VOUT
4
2
C2
1µF/6.3V
J4
GND
J2
GND
Bill of Materials
Item
C1
Part Number
C1608X5R0J106Z
C2
C1608X5R0J105K
R1
CRCW06031002FKEYE3
MIC5326-xxYMT
U1
MIC5327-xxYMT
Manufacturer
Description
Qty
TDK
(1)
Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603
1
TDK
(1)
Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603
1
Resistor, 10kΩ, 1%, 1/16W, Size 0603
1
(2)
Vishay
Micrel(3)
150mA Low IQ Ultra Low Dropout LDO 1.2mmx1.6mm Thin MLF®
300mA Low IQ Ultra Low Dropout LDO 1.2mmx1.6mm Thin MLF®
1
Notes:
1.
TDK: www.tdk.com
2.
Vishay: www.vishay.com
3.
Micrel, Inc.: www.micrel.com
December 2008
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M9999-120508-A
Micrel, Inc.
MIC5326/7 Evaluation Board
PCB Layout Recommendations
Top Layer
Bottom Layer
December 2008
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M9999-120508-A
Micrel, Inc.
MIC5326/7 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.
December 2008
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M9999-120508-A