MIC94310-PYCS [MICREL]

200mA LDO with Ripple Blocker? Technology; 200毫安LDO纹波与拦截™技术


型号：	MIC94310-PYCS
厂家：	MICREL SEMICONDUCTOR
描述：	200mA LDO with Ripple Blocker? Technology 200毫安LDO纹波与拦截™技术
文件：	总13页 (文件大小：1096K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC94310

200mA LDO with

Ripple Blocker™ Technology

General Description

Features

The MIC94310 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

MIC94310 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.

• 1.8V to 3.6V input voltage range

• Active noise rejection over a wide frequency band

−

>50dB from 10Hz to 10MHz at 200mA load

• Rated to 200mA output current

• Fixed output voltages

• Current-limit and thermal-limit protected

• Ultra-small 0.88mm x 0.88mm 4-ball CSP

• 1.2mm x 1.6mm, 4-pin Thin MLF^®

• Logic-controlled enable pin

• −40°C to +125°C junction temperature range

The MIC94310 operates from an input voltage of 1.8V to

3.6V.

Applications

Packaged in a 0.88mm x 0.88mm 4-ball CSP or a 4-pin

1.2mm x 1.6mm Thin MLF^®, the MIC94310 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.

• Smart phones

• Tablet PC/notebooks and webcams

• Digital still and video cameras

• Global positioning systems

• Mobile computing

• Automotive and industrial applications

_________________________________________________________________________________________________

Typical Application

PSRR C_OUT= 1µF

-20

-40

-60

I_OUT= 200mA

I_OUT= 100mA

-80

-100

-120

V_IN= 2.5V + 40mVpp

V_OUT= 1.8V

I_OUT= 10mA

100

10K

100K

10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

FREQUENCY (Hz)

Ripple Blocker 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

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Ordering Information

Part Number

Marking Code

Output Voltage

1.2V

Package^2,3

Lead Finish

MIC94310-4YCS

MIC94310-FYCS

MIC94310-GYCS¹

MIC94310-DYCS¹

MIC94310-JYCS¹

MIC94310-MYCS¹

MIC94310-NYCS¹

MIC94310-PYCS

MIC94310-SYCS

MIC94310-4YMT

MIC94310-FYMT

MIC94310-GYMT

MIC94310-DYMT¹

MIC94310-JYMT¹

MIC94310-MYMT¹

MIC94310-NYMT¹

MIC94310-PYMT

MIC94310-SYMT

Notes:

0.88mm x 0.88mm CSP

1.2mm x 1.6mm Thin MLF^®

Pb-Free

1.5V

1.8V

1.85V

2.5V

2.8V

2.85V

3.0V

3.3V

31T

32T

31G

31D

31J

31M

31N

31P

31S

1.2V

1.5V

1.8V

1.85V

2.5V

2.8V

2.85V

3.0V

3.3V

1. Contact Micrel Marketing for availability.

2. Thin MLF^®▲ = Pin 1 identifier.

3. Thin MLF^®is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Pin Configuration

4-Ball 0.88mm × 0.88mm CSP (CS)

Top View

4-Pin 1.2mm × 1.6mm Thin MLF^®(MT)

Top View

Pin Description

Pin Number

(Thin MLF^®)

Ball Number

(CSP)

Pin Name

VOUT

GND

Power switch output.

Ground.

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

disables the part. Do not leave floating.

–

VIN

Power switch input and chip supply.

ePad

Exposed Heatsink Pad. Connect to Ground for best thermal performance.

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Functional Block Diagram

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Absolute Maximum Ratings⁽¹⁾

Operating Ratings⁽²⁾

Input Voltage (V_IN).............................................. -0.3 to +4V

Output Voltage (V_OUT) ....................–0.3 to V_IN+0.3V or +4V

Enable Voltage (V_EN)......................–0.3 to V_IN+0.3V or +4V

Lead Temperature (soldering, 10s)............................ 260°C

Storage Temperature (Ts).........................–65°C to +150°C

ESD Rating⁽³⁾..................................................................3kV

Input Voltage (V_IN)........................................ +1.8V to +3.6V

Enable Voltage (V_EN).............................................. 0V to V_IN

Junction Temperature (T_J) ........................–40°C to +125°C

Junction Thermal Resistance

Thin MLF^®(θ_JA)................................................173°C/W

CSP (θ_JA) .........................................................250°C/W

Electrical Characteristics⁽⁴⁾

V_IN= V_EN= V_OUT+ 500mV (V_IN= V_EN= 3.6V for V_OUT≥ 3.1V); I_OUT= 1mA; C_OUT= 1µF; T_A= 25°C,

bold values indicate –40°C≤ T_J≤ +125°C, unless noted.

Parameter

Condition

Min.

1.8

–3

Typ.

Max.

3.6

Units

Input Voltage

Output Voltage Accuracy

Variation from nominal V_OUT

V_INto V_OUTdropout at 100mA output current

V_INto V_OUTdropout at 200mA output current

1mA to 100mA

±1

Dropout Voltage

100

Load Regulation

Line Regulation

Ground Current

Shutdown Current

V_IN= V_OUT+ 500mV to 3.6V

No load to full load

0.01

170

0.2

0.5

250

µA

V_EN= 0V

f = 100Hz, I_OUT= 100mA

f = 100kHz, I_OUT= 100mA

f = 1MHz, I_OUT= 100mA

f = 10MHz, I_OUT= 100mA

V_INRipple Rejection

Current Limit

V_OUT= 0V

250

400

700

μV_RMS

μs

Total Output Noise

Turn-On Time

Enable

10Hz to 100kHz

Input Logic Low

Input Logic High

Input Current

Notes:

0.4

1.0

0.01

µA

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed to function outside its operating rating.

3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.

4. Specification for packaged product only.

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Typical Characteristics

PSRR C_OUT= 0.47µF

PSRR C_OUT= 1µF

PSRR C_OUT= 0.47µF

-20

V_IN= 2.0V

V_IN= 2.5V

I_OUT= 100mA

I_OUT= 200mA

-40

-60

-40

I_OUT= 200mA

I_OUT= 100mA

-60

V_IN= 3.6V

-80

-100

-120

-100

-120

V_IN= V_IN(NOM)+ 40mVpp

LOAD = 100mA

-100

-120

V_IN= 2.5V + 40mVpp

_OUT= 1.8V

V_IN= 2.5V + 40mVpp

_OUT= 1.8V

I_OUT= 10mA

V_OUT= 1.8V

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

FREQUENCY (Hz)

PSRR C_OUT= 1µF

PSRR C_OUT= 2.2µF

-20

V_IN= V_IN(NOM)+ 40mVpp

LOAD = 100mA

V_OUT= 1.8V

V_IN= V_IN(NOM)+ 40mVpp

LOAD = 100mA

_OUT= 1.8V

V_IN= 2.0V

V_IN= 2.5V

I_OUT= 200mA

I_OUT= 100mA

-40

V_IN= 2.5V

-60

-80

V_IN= 3.6V

V_IN= 2.5V + 40mVpp

_OUT= 1.8V

-100

-120

-100

-120

-100

-120

I_OUT= 10mA

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

100

10K

100K

10M

FREQUENCY (Hz)

PSRR C_OUT= 4.7µF

PSRR C_OUT= 10µF

-20

V_IN= 2.0V

I_OUT= 200mA

I_OUT= 100mA

V_IN= 2.5V

-40

I_OUT= 200mA

I_OUT= 100mA

-60

-80

V_IN= 3.6V

V_IN= V_IN(NOM)+ 40mVpp

LOAD = 100mA

-100

-120

-100

-120

-100

-120

V_IN= 2.5V + 40mVpp

_OUT= 1.8V

V_IN= 2.5V + 40mVpp

V_OUT= 1.8V

I_OUT= 10mA

V_OUT= 1.8V

I_OUT= 10mA

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

FREQUENCY (Hz)

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Typical Characteristics (Continued)

PSRR C_OUT= 10µF

PSRR (Varying C_OUT)

PSRR (Varying C_OUT

)

-20

V_IN= V_IN(NOM)+ 40mVpp

LOAD = 100mA

C_OUT= 0.47µF

C_OUT= 1µF

V_OUT= 1.8V

C_OUT= 2.2µF

C_OUT= 10µF

V_IN= 2.0V

-40

V_IN= 2.5V

-60

-80

C_OUT= 4.7µF

C_OUT= 2.2µF

V_IN= 3.6V

V_IN= 2.5V + 40mVpp

LOAD = 100mA

V_IN= 2.5V + 40mVpp

LOAD = 100mA

-100

-120

-100

V_OUT= 1.8V

_OUT= 1.8V

-120

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

10 100 1K 10K 100K 1M 10M

100

10K

100K

10M

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

FREQUENCY (Hz)

Dropout Voltage

FREQUENCY (Hz)

Output Voltage

vs. Output Current

Output Voltage

vs. Input Voltage

2.00

vs. Output Current

1.900

1.875

1.850

1.825

1.800

1.775

1.750

1.725

1.700

1.95

1.90

1.85

1.80

1.75

I_OUT= 200mA

1.70

V_IN= 3.6V

1.65

1.60

C_IN= C_OUT= 1µF

100 125 150 175 200

20 40 60 80 100 120 140 160 180 200

2.2

2.4

2.6

2.8

3.2

3.4

3.6

OUTPUT CURRENT (mA)

INPUT VOLTAGE (V)

Output Noise Spectral Density

Ground Current

vs. Output Current

Ground Current

vs. Input Voltage

10.00

1.00

0.10

0.01

175

170

165

160

155

190

180

170

160

150

140

130

120

I_OUT= 200mA

I_OUT= 100mA

V_IN= V_EN= 3.1V

_IN= C_OUT= 1µF

_OUT= 1.8V

C_IN= C_OUT=1µF

NOISE (10Hz to 100kHz)

= 82.55µV_RMS

V_IN=2.8V

C_IN= C_OUT=1µF

150

100

10k

100k

1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06

20 40 60 80 100 120 140 160 180 200

2.2

2.4

2.6

2.8

3.2

3.4

3.6

FREQUENCY (Hz)

OUTPUT CURRENT (mA)

INPUT VOLTAGE (V)

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Functional Characteristics

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Application Information

Enable/Shutdown

The MIC94310 is a very-high PSRR, fixed-output,

200mA LDO utilizing Ripple Blocker™ technology. The

MIC94310 is fully protected from damage due to fault

conditions, offering linear current limiting and thermal

shutdown.

Forcing the enable (EN) pin low disables the MIC94310

and sends it into a “zero” off mode current state. In this

state, current consumed by the MIC94310 goes nearly to

zero. Forcing EN high enables the output voltage. The

EN pin uses CMOS technology and cannot be left

floating as it could cause an indeterminate state on the

output.

Input Capacitor

The MIC94310 is a high-performance, high-bandwidth

device. An input capacitor of 0.47µF is required from the

input to ground to provide stability. Low-ESR ceramic

capacitors provide optimal performance at a minimum of

space. Additional high-frequency capacitors, such as

small-valued NPO dielectric-type capacitors, help filter

out high-frequency noise and are good practice in any

RF-based circuit. X5R or X7R dielectrics are

recommended for the input capacitor. Y5V dielectrics

lose most of their capacitance over temperature and are

therefore, not recommended.

Thermal Considerations

The MIC94310 is designed to provide 200mA of

continuous current in a very-small package. Maximum

ambient operating temperature can be calculated based

on the output current and the voltage drop across the

part. For example if the input voltage is 2.5V, the output

voltage is 1.8V, and the output current = 200mA. The

actual power dissipation of the Ripple Blocker™ can be

determined using the equation:

Output Capacitor

P_D= (V_IN– V_OUT1) I _OUT+ V_INI_GND

In order to maintain stability, the MIC94310 requires an

output capacitor of 0.47µF or greater. For optimal ripple

rejection performance a 1µF capacitor is recommended.

The design is optimized for use with low-ESR ceramic

chip capacitors. High-ESR capacitors are not

recommended because they may cause high-frequency

oscillation. The output capacitor can be increased, but

performance has been optimized for a 1µF ceramic

output capacitor and does not improve significantly with

larger capacitance.

Because this device is CMOS and the ground current is

typically <170µA over the load range, the power

dissipation contributed by the ground current is <1% and

can be ignored for this calculation.

P_D= (2.5V – 1.8V) × 200mA

P_D= 0.14W

X7R/X5R dielectric type ceramic capacitors are

To determine the maximum ambient operating

temperature of the package, use the junction-to-ambient

thermal resistance of the device and the following basic

equation:

recommended

because

their

temperature

performance. X7R type capacitors change capacitance

by 15% over their operating temperature range and are

the most stable type of ceramic capacitors. Z5U and

Y5V dielectric capacitors change their value by as much

as 50% and 60%, respectively, over their operating

temperature ranges. To use a ceramic chip capacitor

with the Y5V dielectric, the value must be much higher

than an X7R ceramic capacitor to ensure the same

minimum capacitance over the equivalent operating

temperature range.

− T_A

⎛

⎜

⎝

⎞

⎟

⎠

J(max)

P_D(MAX)

θ_JA

T_J(max)= 125°C, the maximum junction temperature of the

die, θ_JAthermal resistance = 173°C/W for the Thin MLF^®

package.

No Load Stability

The MIC94310 will remain stable and in regulation with

no load. This is especially important in CMOS RAM

keep-alive applications.

Substituting P_Dfor P_D(MAX)and solving for the ambient

operating temperature will give the maximum operating

conditions for the regulator circuit.

The maximum power dissipation must not be exceeded

for proper operation.

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

For example, when operating the MIC94310-GYMT at

an input voltage of 2.5V and 200mA load with a

minimum footprint layout, the maximum ambient

operating temperature T_Acan be determined as follows:

0.14W = (125°C – T_A)/(173°C/W)

T_A= 101°C

Therefore, the maximum ambient operating temperature

allowed in a 1.2mm x 1.6mm Thin MLF^®package is

101°C. For a full discussion of heat sinking and thermal

effects on voltage regulators, refer to the “Regulator

Thermals” section of Micrel’s Designing with Low-

Dropout Voltage Regulators handbook. This information

can be found on Micrel's website at:

http://www.micrel.com/_PDF/other/LDOBk_ds.pdf

For more information about Micrel’s Ripple Blocker™

products, go to:

http://www.micrel.com/rippleblocker/

http://www.micrel.com/page.do?page=/product-

info/products/mic94300.jsp

http://www.micrel.com/page.do?page=/product-

info/products/mic94310.jsp

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Evaluation Board Schematic

Bill of Materials

Item

Part Number

Manufacturer Description

Qty.

C1, C2 GRM155R61A105KE15D

Murata⁽¹⁾

Capacitor, 1µF Ceramic, 10V, X7R, Size 0402

MIC94310xx-YMT

Micrel, Inc.⁽²⁾

200mA Ripple Blocker™ with Fixed Output Voltage

Notes:

1. Murata Tel: www.murata.com.

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

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Package Information¹

4-Ball 0.88mm × 0.88mm WL-CSP (CS)

Note:

1. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.

M9999-020612-A

February 2012

Micrel, Inc.

MIC94310

Package Information¹(Continued)

4-Pin 1.2mm × 1.6mm Thin MLF^®(MT)

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

Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This

information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,

specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual

property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability

whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties

relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.

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.

M9999-020612-A

February 2012

MIC94310-PYCS [MICREL]

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