MIC5252-2.5YM5TR [ROCHESTER]

2.5 V FIXED POSITIVE LDO REGULATOR, 0.25 V DROPOUT, PDSO5, LEAD FREE, SOT-23, 5 PIN;


型号：	MIC5252-2.5YM5TR
厂家：	Rochester Electronics
描述：	2.5 V FIXED POSITIVE LDO REGULATOR, 0.25 V DROPOUT, PDSO5, LEAD FREE, SOT-23, 5 PIN 光电二极管输出元件调节器
文件：	总10页 (文件大小：1325K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC5252

Micrel, Inc.

MIC5252

150mA High PSRR, Low Noise µCap CMOS LDO

General Description

Features

The MIC5252 is an efﬁcient, precise CMOS voltage regulator

optimized for ultra-low-noise applications. It offers 1% initial

accuracy, extremely-low dropout voltage (135mV at 150mA)

and low ground current (typically 90µA). The MIC5252

provides a very-low-noise output, ideal for RF applications

where a clean voltage source is required. The MIC5252 has

a high PSRR even at low supply voltages, critical for battery

operated electronics. Anoise bypass pin is also available for

further reduction of output noise.

• Input voltage range: 2.7V to 6.0V

• PSRR = 50dB @ V + 0.3V

• Ultra-low output noise: 30µV(rms)

• Stability with ceramic output capacitors

• Ultra-low dropout: 135mV @ 150mA

• High output accuracy:

1.0% initial accuracy

2.0% over temperature

• Low quiescent current: 90µA

• Tight load and line regulation

• TTL-Logic-controlled enable input

• “Zero” off-mode current

Designed speciﬁcally for handheld and battery-powered

devices, the MIC5252 provides a TTL-logic-compatible en-

able pin. When disabled, power consumption drops nearly

to zero.

• Thermal shutdown and current limit protection

The MIC5252 also works with low-ESR ceramic capacitors,

reducing the amount of board space necessary for power

applications, critical in handheld wireless devices.

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• Consumer/personal electronics

Key features include current limit, thermal shutdown, faster

transient response, and an active clamp to speed up device

turn-off. The MIC5252 is available in the 6-pin 2mm × 2mm

MLF™ package and the IttyBitty® SOT-23-5 package in a

wide range of output voltages.

Typical Application

V_OUT

C_OUT

V_IN

MIC5252-x.xBM5

MIC5252-x.xBML

V_IN

V_OUT

C_IN= 1.0µF

ENABLE

SHUTDOWN

Ceramic

C_BYP

(optional)

C_OUT= 1.0µF

Ceramic

Enable

Shutdown

EN (pin 3) may be

connected directly

to IN (pin 1).

C_BYP

= 0.01µF

Ultra-Low-Noise Regulator Application

IttyBitty is a registered trademark of Micrel, Inc.

MicroLeadFrame and MLF are trademarks of Amkor Technology.

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

M9999-020305

February 2005

MIC5252

Micrel, Inc.

Ordering Information

Part Number

Marking

Voltage Junction Temp. Range

Package

Standard

Pb-Free

Standard Pb-Free

MIC5252-1.8BM5

MIC5252-2.5BM5

MIC5252-2.8BM5

MIC5252-1.8YM5

MIC5252-2.5YM5

MIC5252-2.8YM5

L618

L625

L628

L62J

L630

L64H

628

L618

L625

L628

L62J

L630

L64H

628

1.8V

2.5V

-40°C to +125°C

SOT-23-5

2.8V

SOT-23-5

MIC5252-2.85BM5 MIC5252-2.85YM5

MIC5252-3.0BM5 MIC5252-3.0YM5

MIC5252-4.75BM5 MIC5252-4.75YM5

MIC5252-2.8BML MIC5252-2.8YML

MIC5252-2.85BML MIC5252-2.85YML

MIC5252-3.0BML MIC5252-3.0YML

2.85V

3.0V

SOT-23-5

4.75V

2.8V

SOT-23-5

6-Pin 2x2 MLF™

62J

2.85V

3.0V

630

Other voltages available. Contact Micrel for details.

Pin Conﬁguration

EN GND IN

BYP

GND

L6xx

OUT

BYP

OUT

MIC5252-x.xBM5

SOT-23-5 (M5)

(Top View)

MIC5252-x.xBML

6-Pin 2mm × 2mm MLF™ (ML)

(Top View)

Pin Description

Pin Number

Pin Name

Pin Function

SOT-23-5

6-MLF™

GND

Supply Input.

Ground.

Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;

logic low = shutdown. Do not leave open.

BYP

Reference Bypass: Connect external 0.01µF ≤ C_BYP≤ 1.0µF capacitor to

GND to reduce output noise. May be left open.

–

OUT

Regulator Output.

No internal connection.

GND

Ground: Internally connected to the exposed pad. Connect externally to

GND pin.

M9999-020305

February 2005

MIC5252

Micrel, Inc.

Absolute Maximum Ratings⁽¹⁾

Operating Ratings⁽²⁾

Supply Input Voltage (V )....................................0V to +7V

Input Voltage (V ).......................................... +2.7V to +6V

Enable Input Voltage (V ) ..................................0V to +7V

Enable Input Voltage (V ) ...................................0V to V

(3)

Power Dissipation (P )..........................Internally Limited

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

Thermal Resistance

SOT-23 (θ )......................................................235°C/W

Storage Temperature................................ –65°C to +150°C

2x2 MLF™ (θ ) ..................................................90°C/W

Lead Temperature (soldering, 5 sec.)........................ 260°C

(4)

ESD ............................................................................ 2kV

Electrical Characteristics⁽⁵⁾

V_IN= V_OUT+ 1V, V_EN= V_{IN; OUT}= 100µA; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +125°C; unless noted.

Symbol

Parameter

Conditions

Min Typical Max

Units

V_O

Output Voltage Accuracy

I_OUT= 100µA

–1

–3

ΔV_LNR

Line Regulation

Load Regulation

Dropout Voltage⁽⁷⁾

V_IN= V_OUT+ 1V to 6V

I_OUT= 0.1mA to 150mA⁽⁶⁾

I_OUT= 100µA

0.02

0.6

0.1

0.2

1.5

ΔV_LDR

V_IN– V_OUT

I_OUT= 100mA

150

I_OUT= 150mA

135

200

250

I_Q

Quiescent Current

Ground Pin Current⁽⁸⁾

V_EN≤ 0.4V (shutdown)

I_OUT= 0mA

0.2

µA

I_GND

150

200

I_OUT= 150mA

117

PSRR

Ripple Rejection; I_OUT= 150mA

f = 10Hz, C_OUT= 1.0µF, C_BYP= 0.01µF

f = 10Hz, V_IN= V_OUT+ 0.3V

f = 10kHz, V_IN= V_OUT+ 0.3V

V_OUT= 0V

I_LIM

Current Limit

250

425

e_n

Output Voltage Noise

C_OUT= 1.0µF, C_BYP= 0.01µF,

µV(rms)

f = 10Hz to 100kHz

Enable Input

V_IL

V_IH

I_EN

Enable Input Logic-Low Voltage

Enable Input Logic-High Voltage

Enable Input Current

V_IN= 2.7V to 5.5V, regulator shutdown

V_IN= 2.7V to 5.5V, regulator enabled

V_IL≤ 0.4V, regulator shutdown

0.4

1.6

0.01

500

µA

V_IH≥ 1.6V, regulator enabled

Shutdown Resistance Discharge

Thermal Protection

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

150

°C

Notes:

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

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

3. The maximum allowable power dissipation of any T_A(ambient temperature) is P_D(max) = (T_J(max)–T_A)/θ_JA. Exceeding the maximum allowable

power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θ_JAof the MIC5252-x.xBM5 (all ver-

sions) is 235°C/W on a PC board. See ”Thermal Considerations” section for further details.

4. Devices are ESD sensitive. Handling precautions recommended.

5. Speciﬁcation for packaged product only.

6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range

from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation speciﬁcation.

7. Dropout Voltage is deﬁned as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differen-

tial. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating

voltage is 2.7V.

8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin cur-

rent.

February 2005

M9999-020305

MIC5252

Micrel, Inc.

Typical Characteristics

P S R R with B ypas s Variation

P S R R with B ypas s C ap

P S R R with L oad Variation

(V = V

+ 0.3V)

Variation (V = V

+ 1V)

OUT

10nF

100µA

1µF

100nF

0nF

150mA

0nF

10nF

C _OUT= 1µF C eramic

V_IN= V_OUT+ 1V

V_OUT= 2.8V

C _OUT= 1µF C eramic

C _{BY P}= 10nF

V_IN= V_OUT+ 1V

V_OUT= 2.8V

C _OUT= 1µF C eramic

V_IN= V_OUT+ 0.3V

V_OUT= 2.8V

Load = 150mA

10k

100

FREQUENCY (Hz)

10k

100k 1M

10k

100

FREQUENCY (Hz)

100k 1M

100

FREQUENCY (Hz)

Output Voltage

vs . Temperature

P S R R

at 100Hz

vs . L oad C urrent

2.85

2.83

2.81

2.79

2.77

2.75

2.73

2.71

2.69

2.67

2.65

2.84

2.82

2.8

100µA

2.78

2.76

2.74

2.72

2.7

150mA

C _OUT= 1µF

C _BYP= 10nF

V_OUT2.8V

2.8V_OUT

100µA

20 40 60 80 100 120

TEMPERATURE (°C)

20 40 60 80 100 120 140

OUTPUT CURRENT (mA)

-40 -20 0

VOLTAGE DROP (mV)

G round C urrent

vs . Temperature

G round C urrent

vs . S uppl Voltage

vs . Output C urrent

140

120

100

160

140

120

100

120

100

1µA Load

100µA Load

150mA Load

0mA Load

0µA Load

2.8V_OUT

20 40 60 80 100 120 140 160

OUTPUT CURRENT (mA)

-40 -20

20 40 60 80 100 120

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

TEMPERATURE (°C)

SUPPLY VOLTAGE (V)

Dropout

vs . Temperature

G round C urrent

Dropout C haracteris tics

vs . S uppl

Voltage

2.5

200

180

160

140

120

100

140

120

100

100µA

10mA Load

150mA

150mA Load

1.5

2.8V_OUT

I_L= 150mA

20 40 60 80 100 120

TEMPERATURE (°C)

0.5

-40 -20

0.5

1.5

SUPPLY VOLTAGE (V)

2.5

3.5

4.5

0.5

1.5

2 2.5 3 3.5 4 4.5 5

SUPPLY VOLTAGE (V)

M9999-020305

February 2005

MIC5252

Micrel, Inc.

Dropout

E nable Thres hold

vs . Temperature

vs . Output C urrent

vs . S upply Voltage

200

1.4

1.3

1.2

1.1

1.4

1.3

1.2

1.1

180

160

140

120

100

V_IN= 5V

E nable On

E nable Off

V_IN= 3.8V

0.9

0.8

0.7

0.6

0.9

0.8

0.7

0.6

2.8V_OUT

20 40 60 80 100 120 140 160

OUTPUT CURRENT (mA)

-40 -20

20 40 60 80 100 120

2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

S hort C ircuit C urrent

vs . Input S upply Voltage

500

450

400

350

300

250

200

150

100

2.8V_OUT

2.7 3.2 3.7 4.2 4.7 5.2

SUPPLY VOLTAGE (V)

February 2005

M9999-020305

MIC5252

Micrel, Inc.

Functional Characteristics

EnablePin Delay

Load Transient Response

V_OUT= 2.85V

V_IN= 3.6V

C_OUT= 1µF Ceramic

150mA

100µA

TIME (10µs/div)

TIME (40µs/div)

Line Transient Response

3.3V

50mALoad

TIME (10µs/div)

M9999-020305

February 2005

MIC5252

Micrel, Inc.

Block Diagram

Startup/

Shutdown

Control

Quickstart/

Noise

Cancellation

Reference

Voltage

BYP

OUT

FAULT

Thermal

Sensor

Error

Amplifier

Current

Amplifier

Under-

voltage

Lockout

ACTIVE SHUTDOWN

GND

February 2005

M9999-020305

MIC5252

Micrel, Inc.

No-Load Stability

Applications Information

The MIC5252 will remain stable and in regulation with no

load unlike many other voltage regulators. This is especially

important in CMOS RAM keep-alive applications.

Enable/Shutdown

The MIC5252 comes with an active-high enable pin that al-

lows the regulator to be disabled. Forcing the enable pin low

disables theregulator andsendsitintoa“zero”off-mode-cur-

rent state. In this state, current consumed by the regulator

goes nearly to zero. Forcing the enable pin high enables

the output voltage. This part is CMOS and the enable pin

cannot be left ﬂoating; a ﬂoating enable pin may cause an

indeterminate state on the output.

Thermal Considerations

The MIC5252 is designed to provide 150mA of continuous

current in a very small package. Maximum power dissipation

canbecalculatedbasedontheoutputcurrentandthevoltage

drop across the part. To determine the maximum power dis-

sipation of the package, use the junction-to-ambient thermal

resistance of the device and the following basic equation:

Input Capacitor





T (max) − T

The MIC5252 is a high performance, high bandwidth device.

Therefore, it requires a well-bypassed input supply for opti-

mal performance. A 1µF capacitor is required from the input

to ground to provide stability. Low-ESR ceramic capacitors

provide optimal performance at a minimum of space. Addi-

tional 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.

P (max) =









T (max) is the maximum junction temperature of the die,

125°C, and T is the ambient operating temperature. θ is

layout dependent; Table 1 shows examples of junction-to-

ambient thermal resistance for the MIC5252.

Package

_JARecommended

θ_JA1” Square

θ_JC

Minimum Footprint

Copper Clad

Output Capacitor

SOT-23-5

(M5 or D5)

235°C/W

185°C/W

145°C/W

The MIC5252 requires an output capacitor for stability. The

designrequires1µForgreaterontheoutputtomaintainstabil-

ity.Thedesignisoptimizedforusewithlow-ESRceramicchip

capacitors. High ESR capacitors may cause high frequency

oscillation. The maximum recommended ESR is 300mΩ.

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.

Table 1. SOT-23-5 Thermal Resistance

The actual power dissipation of the regulator circuit can be

determined using the equation:

P = (V – V

) I

+ V I

IN GND

OUT OUT

Substituting P (max) for P and solving for the operating

conditions that are critical to the application will give the

maximum operating conditions for the regulator circuit. For

example, when operating the MIC5252-2.8BM5 at 50°C with

a minimum footprint layout, the maximum input voltage for a

set output current can be determined as follows:

X7R/X5R dielectric-type ceramic capacitors are recom-

mendedbecauseoftheirtemperatureperformance.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 value

by as much as 50% and 60%, respectively, over their operat-

ing temperature ranges. To use a ceramic chip capacitor with

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.





125°C − 50°C

235°C/W

P (max) =









P (max) = 315mW

The junction-to-ambient thermal resistance for the minimum

footprint is 235°C/W, from Table 1. The maximum power dis-

sipation must not be exceeded for proper operation. Using

the output voltage of 2.8V and an output current of 150mA,

the maximum input voltage can be determined. Because this

deviceisCMOSandthegroundcurrentistypically100µAover

theloadrange,thepowerdissipationcontributedbytheground

current is <1% and can be ignored for this calculation.

Bypass Capacitor

A capacitor is required from the noise bypass pin to ground

to reduce output voltage noise. The capacitor bypasses

the internal reference. A 0.01µF capacitor is recommended

for applications that require low-noise outputs. The bypass

capacitor can be increased, further reducing noise and im-

proving PSRR. Turn-on time increases slightly with respect

to bypass capacitance. A unique quick-start circuit allows

the MIC5252 to drive a large capacitor on the bypass pin

without signiﬁcantly slowing turn-on time. Refer to the “Typi-

cal Characteristics” section for performance with different

bypass capacitors.

315mW = (V – 2.8V)150mA

315mW = V × 150mA – 420mW

735mW = V × 150mA

V (max) = 4.9V

Therefore, a 2.8V application at 150mA of output current

can accept a maximum input voltage of 4.9V in a SOT-23-5

package. For a full discussion of heat sinking and thermal

effects on voltage regulators, refer to the “Regulator Ther-

mals” sectionofMicrel’sDesigningwithLow-DropoutVoltage

Regulators handbook.

Active Shutdown

The MIC5252 also features an active shutdown clamp, which

is an N-Channel MOSFET that turns on when the device is

disabled. This allows the output capacitor and load to dis-

charge, de-energizing the load.

M9999-020305

February 2005

MIC5252

Micrel, Inc.

Package Information

SOT-23-5 (M5)

6-Pin MLF™ (ML)

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

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

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.

February 2005

M9999-020305

MIC5252-2.5YM5TR [ROCHESTER]

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