MIC5233YM5 - Micrel, Inc. - Datasheet.Live

MIC5233

High Input Voltage

Low IQ µCap LDO Regulator

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

General Description

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.

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.

Available in fixed and adjustable output voltage versions,

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

SOT223-3 package with a junction 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

• 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

• Reverse-battery protection

• Reverse-leakage protection

• Thermal-shutdown and current-limit protection

• IttyBitty® SOT-23-5 and SOT-223-3 packages

Applications

• 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

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Ultra-Low Current Adjustable Regulator Application Ground Current vs. Input Voltage

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Ordering Information

Part Number Marking Voltage Junction Temperature Range(1) Package

MIC5233-1.8YM5 L318 1.8V −40°C to +125°C SOT-23-5

MIC5233-2.5YM5 L325 2.5V −40°C to +125°C SOT-23-5

MIC5233-3.0YM5 L330 3.0V −40°C to +125°C SOT-23-5

MIC5233-3.3YM5 L333 3.3V −40°C to +125°C SOT-23-5

MIC5233-5.0YM5 L350 5.0V −40°C to +125°C SOT-23-5

MIC5233YM5 L3AA Adjustable

−40°C to +125°C SOT-23-5

MIC5233-3.3YS 33YS 3.3V

−40°C to +125°C SOT-223

Note:

1. Other voltages available. Contact Micrel for details.

Pin Configur ation

5-Pin SOT-23 (M5) 3-Pin SOT-223 (S)

Pin Description

Pin Number

SOT-223 Pin Number

SOT-23 Pin Name Pin Function

1 1 IN Supply Input.

2 2 GND Ground.

3 EN Enable (Input). Logic LOW = shutdown; logic HIGH = enable.

NC No Connect.

ADJ Adjustable (Input). Feedback input; connect to resistive voltage-divider network.

3 5 OUT Regulator Output.

TAB GND Ground.

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Absolute Maximum Ratings(1)

Input Supply Voltage (VIN).............................. −20V to +38V

Enable Input Voltage (VEN)............................ −0.3V to +38V

Power Dissipation (PDIS)............................ Internally Limited

Junction Temperature (TJ) ........................−40°C to +125°C

Storage Temperature (TS).........................−65°C to +150°C

ESD Rating(3)................................................. ESD Sensitive

Operating Ratings(2)

Input Supply Voltage (VIN)............................. +2.3V to +36V

Enable Input Voltage (VEN)................................. 0V to +36V

Junction Temperature (TJ) ........................ −40°C to +125°C

Package Thermal Resistance

SOT-23-5 (θJA) .................................................235°C/W

SOT-223 (θJA) ....................................................50°C/W

Electrical Characteristics(4)

TJ = 25°C with VIN = VOUT + 1V; IOUT = 100µA; Bold values indicate –40°C < TJ < +125°C; unless otherwise specified.

Parameter Condition Min. Typ. Max. Units

−1.0 +1.0

Output Voltage Accuracy Variation from nominal VOUT −2.0 +2.0 %

Line Regulation VIN = VOUT + 1V to 36V 0.04 0.5 %

Load Regulation IOUT = 100µA to 100mA 0.25 1 %

IOUT = 100µA 50

230 300

IOUT = 50mA

400

270 400

Dropout Voltage

IOUT = 100mA

450

18 30

IOUT = 100µA

35 µA

IOUT = 50mA 0.25 0.70

Ground Current

IOUT = 100mA 1 2 mA

Ground Current in Shutdown VEN ≤ 0.6V; VIN + 36V (SOT-23 package only) 0.1 1 µA

Short-Circuit Current VOUT = 0V 190 350 mA

Output Leakage, Reverse Polarity Input Load = 500Ω; VIN = −15V −0.1 µA

Enable Input (SOT-23 Package Only)

Input LOW Voltage Regulator OFF 0.6 V

Input HIGH Voltage Regulator ON 2.0 V

VEN = 0.6V; Regulator OFF −1.0 0.01 1.0

VEN = 2.0V; Regulator ON 0.1 1.0

Enable Input Current

VEN = 36V; Regulator ON 0.5 2.5

µA

Start-Up Time Guaranteed by design 1.7 7 ms

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

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Typical Characteristics

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Typical Characteristics (Continued)

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Functional Characteristics

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Functional Diagrams

Fixed Output Voltage (M5 Package)

Fixed Output Voltage (S Package)

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Functional Diagrams (Continued)

Adjustable Output Voltage

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Application Information

Enable/Shutdown

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.

Input Capacitor

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.

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.

X7R/X5R dielectric-type ceramic capacitors are

recommended because of 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.

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.

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

of the device and the following Equation 1:

⎟

⎠

⎞

⎜

⎝

⎛−

AJ(MAX)

D(MAX) θ

P Eq. 1

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

125°C, and TA is the ambient operating temperature. θJA

is layout dependent; Table 1 shows examples of the

junction-to-ambient thermal resistance for the MIC5233:

Package θJA Recommended

Minimum Footprint

SOT-23-5 235°C/W

SOT223 50°C/W

Table 1. SOT23-5 and SOT-223 T hermal Resistance

The actual power dissipation of the regulator circuit can

be determined using Equation 2:

PD = (VIN − VOUT)IOUT + VIN × IGND Eq. 2

Substituting PD(MAX) for PD 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 MIC5233-3.0YM5 at

50°C with a minimum footprint layout, the maximum

input voltage for a set output current can be determined

as follows:

⎟

⎠

⎞

⎜

⎝

⎛

°−°

=C/W235

C50C125

PD(MAX) Eq. 3

where PD(MAX) = 319mW.

The junction-to-ambient (θJA) 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.

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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.

Total power dissipation is calculated using the following

equation:

PD = (VIN − VOUT)IOUT + VIN × IGND Eq. 4 Adjustable Regulator Application

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:

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. ⎟

⎟

⎠

⎞

⎜

⎝

⎛⎟

⎠

⎞

⎜

⎝

⎛

+= R2

1VV REFOUT Eq. 8

PD(MAX) = (VIN − VOUT)IOUT + VIN × IGND

where VREF = 1.24V.

319mW = (VIN − 3V)100mA + VIN × 2.8mA Eq. 5

Feedback resistor R2 should be no larger than 300kΩ.

Ground pin current is estimated using the typical

characteristics of the device.

619mW = VIN (102.8mA)

VIN = 6.02V Eq. 6

For higher current outputs only a lower input voltage will

work for higher ambient temperatures.

Assuming a lower output current of 10mA, the maximum

input voltage can be recalculated:

Figure 1. Adjustable Voltage Application

319mW = (VIN − 3V)10mA + VIN × 0.1mA

349mW = VIN × 10.1mA

VIN = 34.9V Eq. 7

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Package Information

5-Pin SOT-23 (M5)

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Package Information (Continued)

3-Pin SOT-223 (S)

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

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