MIC94325/45/55

500mA LDO with

Ripple Blocker Technology

General Description

The MIC943x5 Ripple Blocker is a monolithic integrated

circuit that provides low-frequency ripple attenuation

(switching noise rejection) to a regulated output voltage.

This is important for applications where a DC/DC switching

converter is required to lower or raise a battery voltage but

where switching noise cannot be tolerated by sensitive

downstream circuits such as in RF applications. The

MIC943x5 maintains high power supply ripple rejection

(PSRR) with input voltages operating near the output

voltage level to improve overall system efficiency. A low-

voltage logic enable pin facilitates ON/OFF control at

typical GPIO voltage levels.

The MIC943x5 operates from an input voltage of 1.8V to

3.6V. The MIC943x5 options include fixed (MIC94345/55)

or adjustable (MIC94325) output voltages. The MIC94355

version offers an auto-discharge to discharge the output

capacitor when the part is disabled.

Packaged in a 0.84mm x 1.32mm 6-ball CSP or a 6-pin

1.6mm x 1.6mm Thin DFN, the MIC943x5 has a junction

operating temperature range of –40C to +125C.

Data sheets and support documentation can be found on

Micrel’s web site at:

www.micrel.com.

Features



1.8V to 3.6V input voltage range



Active noise rejection over a wide frequency band



>50dB from 10Hz to 5MHz at 500mA load



Rated to 500mA output current



Fixed and adjustable output voltages



Optional output auto-discharge when disabled



Current-limit and thermal-limit protected



Ultra-small 0.84mm x 1.32mm 6-ball CSP



1.6mm x 1.6mm, 6-pin Thin DFN



Logic-controlled enable pin

 40C

to +125C junction temperature range

Applications



Smart phones



Tablet PC/notebooks and webcams



Digital still and video cameras



Global positioning systems



Mobile computing



Automotive and industrial applications

_________________________________________________________________________________________________

MIC94355 PSRR

C

OUT

= 4.7µF

V

IN

= 2.8V + 40mVpp

-20

-40

-60

-80

10mA

V

OUT

= 1.8V

C

OUT

= 4.7µF

Typical Application

0

PSRR (dB)

500mA

-100

-120

10

100

1,000

1K

200mA

10,000 100,00 1,000,0 10,000,

10K

100K

1M

10M

0

00

000

FREQUENCY (Hz)

Ripple Blocker is a trademark of Micrel, 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

October 2012

M9999-102512-A

Micrel, Inc.

MIC94325/45/55

Ordering Information

Part Number

MIC94325YMT

MIC94345-4YCS*

MIC94345-FYCS*

MIC94345-GYCS*

MIC94345-MYCS*

MIC94345-SYCS*

MIC94345-4YMT*

MIC94345-FYMT*

MIC94345-GYMT*

MIC94345-MYMT*

MIC94345-SYMT*

MIC94355-4YCS*

MIC94355-FYCS*

MIC94355-GYCS*

MIC94355-MYCS*

MIC94355-SYCS*

MIC94355-4YMT*

MIC94355-FYMT*

MIC94355-GYMT

MIC94355-MYMT*

MIC94355-SYMT*

Notes:

1.



Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Contact Micrel Marketing for availability.

Marking Code

2R

L4

LF

X1

X2

X3

4L

FL

1X

2X

3X

G9

G0

G1

G2

G3

9G

0G

2G

7G

8G

Output Voltage

ADJ

1.2V

1.5V

1.8V

2.8V

3.3V

1.2V

1.5V

1.8V

2.8V

3.3V

1.2V

1.5V

1.8V

2.8V

3.3V

1.2V

1.5V

1.8V

2.8V

3.3V

Auto Discharge

─

Yes

Package

1

1.6mm x 1.6mm Thin DFN

0.84mm x 1.32mm CSP

1.6mm x 1.6mm Thin DFN

0.84mm x 1.32mm CSP

1.6mm x 1.6mm Thin DFN

Lead Finish

Pb-Free

October 2012

2

M9999-102512-A

Micrel, Inc.

MIC94325/45/55

Pin Configuration

6-Ball 0.84mm



1.32mm CSP (CS)

Ball View

Note:

1.

Thin DFN

▲

= Pin 1 identifier.

6-Pin 1.6mm



1.6mm Thin DFN (MT)

Top View

Pin Description

Pin Number

(Thin DFN)

Fixed

1, 2

-

3

4

5, 6

EP

Pin Number

(Thin DFN)

Adjustable

1

2

3

4

5, 6

EP

Ball Number

(CSP)

Fixed

A2, B2

-

C2

C1

A1, B1

–

VOUT

ADJ

GND

EN

VIN

ePad

Power Switch Output.

Adjust input. Connect to resistive divider at VOUT to set the output

voltage. Do not leave floating.

Ground.

Enable Input. A logic HIGH signal on this pin enables the part. Logic

LOW disables the part. Do not leave floating.

Power Switch Input And Chip Supply.

Exposed Heatsink Pad. Connect to Ground plane for best thermal

performance.

Pin Name

October 2012

3

M9999-102512-A

Micrel, Inc.

MIC94325/45/55

Functional Block Diagrams

MIC94325 Adjustable Output

MIC94345 Fixed Output

October 2012

4

M9999-102512-A

Micrel, Inc.

MIC94325/45/55

Functional Block Diagrams (Continued)

MIC94355 Fixed Output with Auto-Discharge

October 2012

5

M9999-102512-A

参数名称	属性值
Manufacture	Micrel
产品种类 Product Category	LDO Voltage Regulators
RoHS	Yes
Input Voltage MAX	3.6 V
Output Voltage	1.5 V
Dropout Voltage - Max	200 mV
Output Curre	500 mA
Load Regulati	10 mV
Number of Outputs	1 Outpu
输出类型 Output Type	Fixed
最大工作温度 Maximum Operating Temperature	+ 125 C
安装风格 Mounting Style	SMD/SMT
封装 / 箱体 Package / Case	CSP-6
Input Voltage MIN	1.8 V
Line Regulati	1 %
最小工作温度 Minimum Operating Temperature	- 40 C
系列 Packaging	Reel
PSRR / Ripple Rejection - Ty	85 dB
Reference Voltage	1.1 V
工厂包装数量 Factory Pack Quantity	500
Voltage Regulation Accuracy	3 %

MIC94345-FYCS T5

MIC94345-FYCS T5概述

MIC94345-FYCS T5规格参数

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