MIC5233-3.3BM5TR [ROCHESTER]

3.3 V FIXED POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PDSO5, SOT-23, 5 PIN;


型号：	MIC5233-3.3BM5TR
厂家：	Rochester Electronics
描述：	3.3 V FIXED POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PDSO5, 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：1131K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC5233

High Input Voltage

Low IQ µCap LDO Regulator

General Description

Features

The MIC5233 is a 100mA highly accurate, low dropout

regulator with high input voltage and ultra-low ground

current. This combination of high voltage and low ground

current makes the MIC5233 ideal for multi-cell Li-Ion

battery systems.

• Wide input voltage range: 2.3V to 36V

• Ultra low ground current: 18μA

• Low dropout voltage of 270mV at 100mA

• High output accuracy of ±2.0% over temperature

• μCap: stable with ceramic or tantalum capacitors

• Excellent line and load regulation specifications

• Zero shutdown current

A μCap LDO design, the MIC5233 is stable with either

ceramic or tantalum output capacitor. It only requires a

2.2μF capacitor for stability.

Features of the MIC5233 include enable input, thermal

shutdown, current limit, reverse battery protection, and

reverse leakage protection.

• Reverse battery protection

• Reverse leakage protection

• Thermal shutdown and current limit protection

• IttyBitty® SOT-23-5 package

•

Available in fixed and adjustable output voltage versions,

the MIC5233 is offered in the IttyBitty® SOT-23-5 package

with a junction temperature range of –40°C to +125°C.

Applications

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

• Keep-alive supply in notebook and portable computers

• USB power supply

• Logic supply for high-voltage batteries

• Automotive electronics

• Battery powered systems

• 3-4 cell Li-Ion battery input range

___________________________________________________________________________________________________________

Typical Application

MIC5233BM5

V_IN

C_IN=1.0µF

V_OUT

R₁

R₂

C_OUT=2.2µF

ceramic

OFF ON

_GND=18µA

Ultra-Low Current Adjustable Regulator Application

Ground Current vs. Input Voltage

IttyBitty is a registered 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

M9999-092109

September 2009

Micrel, Inc.

MIC5233

Ordering Information⁽¹⁾

Part Number

Voltage

Junction Temp. Range

Package

Standard

Marking

Pb-Free

Marking

L318

MIC5233-1.8BM5

MIC5233-2.5BM5

MIC5233-3.0BM5

MIC5233-3.3BM5

MIC5233-5.0BM5

MIC5233BM5

Note:

L318

L325

L330

L333

L350

L3AA

MIC5233-1.8YM5

MIC5233-2.5YM5

MIC5233-3.0YM5

MIC5233-3.3YM5

MIC5233-5.0YM5

MIC5233YM5

1.8V

2.5V

3.0V

3.3V

5.0V

ADJ.

–40°C to +125°C

SOT-23-5

L325

L330

L333

L350

L3AA

1. Other Voltage available. Contact Micrel for detail.

Pin Configuration

5-Pin SOT-23 (M5)

Pin Description

Pin Number

Pin Name

Pin Function

Supply Input.

Ground.

GND

Enable (Input): Logic low = shutdown; logic high = enable

NC (fixed)

ADJ (adj.)

OUT

No Connect

Adjust (Input): Feedback input. Connect to resistive voltage-divider network.

Regulator Output.

M9999-092109

September 2009

Micrel, Inc.

MIC5233

Absolute Maximum Ratings⁽¹⁾

Operating Ratings⁽²⁾

Input Supply Voltage........................................ –20V to 38V

Enable Input Voltage....................................... –0.3V to 38V

Power Dissipation .....................................Internally Limited

Junction Temperature ...............................–40°C to +125°C

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

ESD Rating, Note 3

Input Supply Voltage ........................................ 2.3V to 36V

Enable Input Voltage............................................ 0V to 36V

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

Package Thermal Resistance

SOT-23-5 (θ_JA)^{...........................................................................}235°C/W

Electrical Characteristics⁽⁴⁾

T_A= 25°C with V_IN= V_OUT+ 1V; I_OUT= 100µA; V_EN≥ 2V; Bold values indicate –40°C<T_J<+125°C; unless otherwise

specified.

Parameter

Condition

Min

–1.0

–2.0

Typ

Max

+1.0

+2.0

0.5

Units

Output Voltage Accuracy

Variation from nominal V_OUT

Line Regulation

Load Regulation

Dropout Voltage

V_IN= V_OUT+ 1V to 36V

I_OUT= 100µA to 100mA

I_OUT= 100µA

0.04

0.25

µA

I_OUT= 50mA

230

300

400

450

I_OUT= 100mA

I_OUT= 100µA

270

Ground Current

I_OUT= 50mA

0.25

0.70

I_OUT= 100mA

Ground Current in Shutdown

Short Circuit Current

V_EN≤ 0.6V; V_IN= 36V

V_OUT= 0V

0.1

190

–0.1

350

Output Leakage, Reverse

Polarity Input

Load = 500Ω; V_IN= –15V

Enable Input

Input Low Voltage

Input High Voltage

Enable Input Current

Regulator OFF

0.6

Regulator ON

2.0

VEN = 0.6V; Regulator OFF

VEN = 2.0V; Regulator ON

VEN = 36V; Regulator ON

Guaranteed by design

–1.0

0.01

0.1

1.0

2.5

µA

0.5

µA

Start-Up Time

1.7

msec

Notes:

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.

M9999-092109

September 2009

Micrel, Inc.

MIC5233

Typical Characteristics

M9999-092109

September 2009

Micrel, Inc.

MIC5233

M9999-092109

September 2009

Micrel, Inc.

MIC5233

Functional Diagram

OUT

ENABLE

V_REF

GND

Bloack Diagram – Fixed Output Voltage

OUT

ENABLE

V_REF

ADJ

GND

Bloack Diagram – Adjustable Output Voltage

M9999-092109

September 2009

Micrel, Inc.

MIC5233

of the device and the following basic equation:

Application Information

T_J(MAX)− T_A

⎛

⎜

⎝

⎞

⎟

⎠

P_D(MAX)

Enable/Shutdown

θ_JA

The MIC5233 comes with an active-high enable pin that

allows the regulator to be disabled. Forcing the enable

pin low disables the regulator and sends it into a “zero”

off-mode-current state. In this state, current consumed

by the regulator goes nearly to zero. Forcing the enable

pin high enables the output voltage.

T_J(MAX)is the maximum junction temperature of the die,

125°C, and T_Ais the ambient operating temperature. θ_JA

is layout dependent; Table 1 shows examples of the

junction-to-ambient thermal resistance for the MIC5233.

Package

θ_JARecommended

Minimum Footprint

Input Capacitor

SOT-23-5

235°C/W

The MIC5233 has high input voltage capability up to

36V. The input capacitor must be rated to sustain

voltages that may be used on the input. An input

capacitor may be required when the device is not near

the source power supply or when supplied by a battery.

Small, surface mount, ceramic capacitors can be used

for bypassing. A larger value may be required if the

source supply has high ripple.

Table 1. SOT-23-5 Thermal Resistance

The actual power dissipation of the regulator circuit can

be determined using the equation:

P_D= (V_IN– V_OUT)I_OUT+ V_IN×I_GND

Substituting P_D(MAX)for P_Dand 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 MIC5233-3.0BM5 at

50°C with a minimum footprint layout, the maximum

input voltage for a set output current can be determined

as follows:

Output Capacitor

The MIC5233 requires an output capacitor for stability.

The design requires 2.2µF or greater on the output to

maintain stability. The design is optimized for use with

low-ESR ceramic chip capacitors. High-ESR capacitors

may cause high frequency oscillation. The maximum

recommended ESR is 3Ω. The output capacitor can be

increased without limit. Larger valued capacitors help to

improve transient response.

125°C − 50°C

235°C / W

⎛

⎜

⎞

⎟

P_D(MAX)

⎝

⎠

_D(MAX)= 319mW

The junction-to-ambient (θ_JA) thermal resistance for the

minimum footprint is 235°C/W, from Table 1. It is

important that the maximum power dissipation not be

exceeded to ensure proper operation. Since the

MIC5233 was designed to operate with high input

voltages, careful consideration must be given so as not

to overheat the device. With very high input-to-output

voltage differentials, the output current is limited by the

total power dissipation. Total power dissipation is

calculated using the following equation:

X7R/X5R dielectric-type ceramic capacitors are

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 value by as much as

50% and 60% respectively over their operating

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.

P_D= (V_IN– V_OUT)I_OUT+ V_IN× I_GND

Due to the potential for input voltages up to 36V, ground

current must be taken into consideration.

If we know the maximum load current, we can solve for

the maximum input voltage using the maximum power

dissipation calculated for a 50°C ambient, 319mV.

No-Load Stability

The MIC5233 will remain stable and in regulation with no

load unlike many other voltage regulators. This is

especially important in CMOS RAM keep-alive

applications.

P_D(MAX)= (V_IN– V_OUT)I_OUT+ V_IN× I_GND

319mW = (V_IN– 3V)100mA + V_INx 2.8mA

Ground pin current is estimated using the typical

characteristics of the device.

Thermal Consideration

The MIC5233 is designed to provide 100mA of

continuous current in a very small package. Maximum

power dissipation can be calculated based on the output

current and the voltage drop across the part. To

determine the maximum power dissipation of the

package, use the junction-to-ambient thermal resistance

619mW = V_IN(102.8mA)

V_IN= 6.02V

For higher current outputs only a lower input voltage will

work for higher ambient temperatures.

M9999-092109

September 2009

Micrel, Inc.

MIC5233

Assuming a lower output current of 10mA, the maximum

input voltage can be recalculated:

⎛

⎜

⎝

⎞

⎟

⎠

⎛

⎜

⎝

⎞

⎟

⎠

R₁

R₂

⎜

V_OUT= V_REF1+

319mW = (V_IN– 3V)10mA + V_IN× 0.1mA

349mW = V_IN× 10.1mA

V_IN= 34.9V

Where V_REF= 1.24V.

Feedback resistor R2 should be no larger than 300kΩ.

MIC5233BM5

V_IN

V_OUT

Maximum input voltage for a 10mA load current at 50°C

ambient temperature is 34.9V, utilizing virtually the entire

operating voltage range of the device.

OUT

ADJ.

R₁

R₂

Adjustable Regulator Application

2.2µF

1.0µF

GND

The MIC5233BM5 can be adjusted from 1.24V to 20V by

using two external resistors (Figure 1). The resistors set

the output voltage based on the following equation:

Figure 1. Adjustable Voltage Application

M9999-092109

September 2009

Micrel, Inc.

MIC5233

Package Information

5-Pin SOT-23 (M5)

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 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.

M9999-092109

September 2009

MIC5233-3.3BM5TR [ROCHESTER]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E