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MIC5385 Evaluation Board

Ultra-Small Triple 150mA Output LDO

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

General Description

The MIC5385 is an advanced, triple-output, low-noise LDO

for powering general purpose portable devices. The

MIC5385 provides three independently-enabled, high-

performance, 150mA LDOs in an ultra-small 2mm x 2mm

Thin MLF® package while using only four external

components.

Ideal for battery-powered applications, the MIC5385 offers

low dropout voltage of 180mV at 150mA and low ground

current (typically 32µA per LDO). It can also be put into a

zero-off-mode current state, drawing virtually no current

when disabled.

An input capacitor is 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.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Requirements

The MIC5385 evaluation board requires an input power

supply that is capable of delivering a minimum 600mA at a

voltage range of 2.5V to 5.5V. The output load can be

either active or passive.

Precautions

The MIC5385 evaluation board does not have reverse

polarity protection. Applying a negative voltage to the VIN

terminal may damage the device.

Getting Started

• Connect an External Supply to V IN. Apply the desired

input voltage to the VIN (J1) and ground (J2) terminal of

the evaluation board, paying careful attention to polarity

and supply voltage (2.5V ≤ VIN ≤ 5.5V). An ammeter can

be placed between the input supply and the V IN 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.

• Enable/Disable the MIC5385. To enable the MIC5385

jumper, the enable terminal (J5 for LDO1, J4 for LDO2,

and J3 for LDO3) to V IN

. To disable the output, simply

remove the jumper from the EN terminal. The enable pin

must be either pulled high or low. Leaving the pin

floating will cause the regulator to operate in an

indeterminate state. The evaluation board is supplied

with 100KΩ pull-down resistors for default off state.

• Connect the Load. Connect the load to the VOUT

Terminals (J7 for LDO1, J8 for LDO2 and J6 for LDO3)

and Ground Terminal (J9, J10). The load can be either a

passive (resistor) or active (electronic load). Be sure to

monitor the output voltage at the VOUT (J6, J7 and J8)

terminals.

Ordering Information

April 2010 M9999-041610-A

_________________________________________________________________________________________________________________________

Part Number Description

MIC5385-SGFYMT EV Triple-Output LDO Evaluation Board.

VOUT1 =3.3V, VOUT2 =1.8V, VOUT3 =1.5V

Micrel, Inc. MIC5385 Evaluation Board

April 2010 2 M9999-041610-A

Evaluation Board Schematic

Bill of Materials

Item Part Number Manufacturer Description Qty.

C1 C1608X5R0J106K TDK(1) 10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor 1

GRM155R1A1055KE19D Murata(2) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor

0402ZD105KAT2A AVX(3) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor

C2, C3, C4

LMK105BJ105KV-F Taiyo Yuden(4) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor

R1, R2, R3 CRCW0402100KFKEA Vishay(5) 100KΩ, 1%, 1/16W, Size 0402 Resistor 3

U1 MIC5385-SGFYMT Micrel, Inc.(6) High-Performance, Triple-Output, 150mA LDO 1

Notes:

1. TDK: www.tdk.com.

2. Murata: www.murata.com.

3. AVX: www.avx.com.

4. Taiyo Yuden: www.t-Yuden.com.

5. Vishay: www.vishay.com.

6. Micrel, Inc.: www.micrel.com.

Micrel, Inc. MIC5385 Evaluation Board

April 2010 3 M9999-041610-A

PCB Layout Recommendations

Top Layer

Bottom Layer

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 without notification to the customer. circuitry and specifications at any time

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 system tended for surgical implants are devices or systems that (a) are in

into the body or (b) support or sustain life, and whose failure t injury to the user. A to perform can be reasonably expected to result in a significan

Purchaser’s use or sale of Micrel Produc Purchaser agrees to fully ts for use in life support appliances, devices or systems is a Purchaser’s own risk and

indemnify Micrel for any damages resulting from such use or sale.