Microchip MIC5320/1 Manual


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Side 1/4
MIC5320/1 Evaluation Board
High Performance Dual 150mA
µCap ULDO™
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
General Description
The MIC5320 and MIC5321 are tiny dual output, ultra low
dropout linear regulators. The MIC5320 regulator provides
two independent enable pins, to disable each output
separately. The MIC5321 regulator provides a single
enable pin for both outputs as well as a bypass pin to
reduce the output voltage noise. The MIC5320/1 provides
two high performance 150mA LDOs in a tiny 6 pin 1.6mm
x 1.6mm Thin MLF
®
package.
The MIC5320/1 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. A bypass
capacitor of 0.01µF is included on the evaluation board for
the MIC5321 to reduce the output voltage noise and
improve the Power Supply Rejection Ratio (PSRR).
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 MIC5320/1 evaluation board requires an input power
source that is able to deliver at least 300mA 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 V
IN
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.
Getting Started
1. Connect an external supply to V
IN
. Apply the
desired input voltage to the V
IN
(J1) and ground
terminal (J2) of the evaluation board, paying
careful attention to polarity and supply voltage
(2.3V V
IN
5.5V). An ammeter may be placed
between the input supply and the V
IN
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 V
IN
terminal.
2. Enable/Disable the MIC5320. 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 V
IN
. 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.
The MIC5321 has a single enable pin (J7) to
control both outputs of the regulator.
3. Connect the loads to the V
OUT
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 V
OUT
(J4 and J6) terminals.
Ordering Information
Part Number Description
MIC5320-XXYMT EV Evaluation board with the 150mA Dual
ULDO™ device
MIC5321-XXYMT EV Evaluation board with the 150mA Dual
ULDO™ device with bypass


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC5320/1

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