MIC37122YM EV Micrel, MIC37122YM EV Datasheet

MIC37122YM EV

Manufacturer Part Number

MIC37122YM EV

Description

Power Management IC Development Tools High Performance Low Noise 1A LDO - Evaluation Board

Manufacturer

Micrel

Type

LDO Controllers & Regulatorsr

Datasheet

1.MIC37122YM_EV.pdf (8 pages)

Specifications of MIC37122YM EV

Product

Evaluation Boards

Tool Is For Evaluation Of

MIC37122

Input Voltage

2.375 V to 5.5 V

Output Voltage

Adjustable

Description/function

Evaluation Board

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Output Current

1 A

For Use With

MIC37122

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General Description

The MIC37122 is a high-performance low-noise, low

dropout regulator. The MIC37122 is capable of sourcing

1A output current and offers high-PSRR and low output

noise, which makes the IC an ideal general purpose

LDO regulator for consumer applications such as set-top

boxes and gaming consoles.

The MIC37122 offers 2.5% accuracy, dropout of less

than 400mV at 1A, and low ground current (typically

250µA). The MIC37122 can also be put into zero-off-

mode current state, drawing little current when disabled.

Additionally, an output load discharge feature allows the

MIC37122 to discharge large capacitive loads through a

low impedance path to ground upon disabling the LDO

regulator.

The MIC37122 has an operating junction temperature

range of −40°C to +125°C and is available in lead-free

(RoHS-compliant) SOIC-8 and 2.0mm × 2.0mm MLF

packages. The MLF

PCB area, an 86% reduction in board area compared to

SOIC-8 packaging.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Requirements

The MIC37122 evaluation board requires a single input

power supply. The V

deliver 2.375V to 5.5V with more than 1A capability. The

output load can either be an active or passive load.

Precautions

The evaluation board does not have reverse polarity

protection. Applying a negative voltage to the V

terminal may damage the device. Additionally, the

maximum V

evaluation board is 5.5V. Exceeding 5.5V on V

permanently damage the device.

October 2011

MLF and MicroLeadFrame are 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 •

operating voltage of the MIC37122

package occupies only 4mm

power supply must be able to

could

Getting Started

1. Connect an external supply to V

2. Connect the load to the V

3. Enable the MIC37122. The enable (EN) pin is

Output Voltage

The output voltage on the MIC37122 evaluation board is

adjustable. The output is set by adjusting the feedback

resistors (R1 and R2) and can be calculated as follows:

With V

MIC37122 Evaluation Board

desired input voltage to the V

terminals of the evaluation board, paying careful

attention to polarity and supply voltage. An ammeter

may be placed between the input supply and the V

terminal to the evaluation board. Ensure that the

supply voltage is monitored at the V

ammeter and/or power lead resistance can reduce

the voltage supplied to the input.

The load can be either passive (resistive) or active

(as in an electronic load). An ammeter can be

placed between the load and the V

Ensure that the output voltage is monitored at the

changing the feedback resistors (see Output

Voltage section in this data sheet).

provided on the evaluation board with a 10k pull-up

resistor. The output of the MIC37122 may be turned

off by shorting the EN pin to ground. An external

connection on the board provides easy access to

the EN pin. Removing the pull-up resistor and

leaving the EN pin floating will cause the regulator

to operate in an indeterminate state.

High-Performance, 1A, Low-Noise,

OUT

REF

OUT

= 1.0V:

terminal. The V

Low Dropout Regulator

OUT

REF

−

1.0V

⎛

⎜

⎝

OUT

⎞

⎟

⎠

can be adjusted by

http://www.micrel.com

and GND terminals.

and ground (GND)

M9999-101211- A

terminal. Apply

terminal. The

OUT

terminal.

Related parts for MIC37122YM EV

MIC37122YM EV Summary of contents

Page 1

... Exceeding 5. permanently damage the device. MLF and MicroLeadFrame are 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 • October 2011 MIC37122 Evaluation Board ...

Page 2

... Ordering Information Part Number MIC37122YM EV MIC37122YMT EV MIC37122YM Evaluation Board Schematic (8-Pin SOIC) October 2011 Description Adjustable Output Adjustable Output MIC37122YM Evaluation Board (J1, J2, and R3 are for test purposes only) 2 Package SOIC-8L ® 2mm × 2mm MLF -6L M9999-101211- A ...

Page 3

... U1 MIC37122YM Notes: 1. Kemet: www.kemet.com. 2. Murata: www.murata.com. 3. TDK: www.tdk.com. 4. AVX: www.avx.com. 5. Vishay: www.vishay.com. 6. Micrel, Inc.: www.micrel.com. October 2011 Manufacturer Description (1) Kemet 10µF/10V ceramic capacitor, X5R, size 0805 (2) Murata (3) TDK 47µF/6.3V ceramic capacitor, X5R, size 1206 (3) Murata (greater or lesser capacitance value or larger case ...

Page 4

... MIC37122YM PCB Layout Recommendations October 2011 MIC37122YM Evaluation Board − Top Layer MIC37122YM Evaluation Board − Bottom Layer 4 M9999-101211- A ...

Page 5

MIC37122YMT Evaluation Board Schematic (2mm × 2mm 6-Pin MLF October 2011 MIC37122YMT Evaluation Board (J1, J2, and R3 are for test purposes only) 5 ® ) M9999-101211- A ...

Page 6

... U1 MIC37122YMT Notes: 1. Kemet: www.kemet.com. 2. Murata: www.murata.com. 3. TDK: www.tdk.com. 4. AVX: www.avx.com. 5. Vishay: www.vishay.com. 6. Micrel, Inc.: www.micrel.com. October 2011 Manufacturer Description (1) Kemet 10µF/10V ceramic capacitor, X5R, 10%, 0805 (2) Murata 10µF/10V ceramic capacitor, X5R, 20%, 0805 (3) TDK 47µF/6.3V ceramic capacitor, X5R, size 1206 (3) Murata ...

Page 7

MIC37122YMT PCB Layout Recommendations October 2011 MIC37122YMT Evaluation Board − Top Layer MIC37122YMT Evaluation Board − Bottom Layer 7 M9999-101211- A ...

Page 8

... 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 ...

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