MIC5327-1.8YMTTR - Micrel, Inc.

MIC5327

300mA Low Quiescent Current LDO

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

September 2008 M9999-093008-A

General Description

The MIC5327 is a low quiescent current, low dropout

regulator designed for optimal performance in a small

space. The MIC5327 is capable of sourcing 300mA of

output current while only consuming 24µA of operating

current. This high performance LDO offers Low dropout,

fast transient response, good PSRR, and low output

voltage noise.

The MIC5327 is an ideal solution for battery operated

applications due to ultra low quiescent current and

extremely low dropout voltage of 180mV at 300mA.

Equipped with a TTL logic compatible enable pin, the

MIC5327 can be put into a zero-off-mode current state,

drawing virtually no current when disabled.

Board space and component cost is minimized because

the MIC5327 operates with very small 1μF ceramic

capacitors, provides fixed output voltages, and is available

in the tiny 1.2mm x 1.6mm Thin MLF® package.

MIC5327 also features thermal shutdown and current limit

protection.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• 300mA output current

• Input voltage range: 2.3V to 5.5V

• Low 24µA operating current

• Low dropout voltage of 180mV @ 300mA

• Fixed output voltages

• Stable with 1μF ceramic capacitors

• Thermal shutdown and current limit protection

• Tiny 4-pin 1.2mm x 1.6mm Thin MLF® package

Applications

• Mobile Phones

• GPS and Navigation Devices

• Portable Media Players

• Digital still and video cameras

• PDAs

• Portable Electronics

___________________________________________________________________________________________________________

Typical Application MIC5327-xxYMT

VIN

VEN

VOUT

GND

1µF1µF

VBAT

VOUT

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Ordering Information

Part Number Marking(1) Voltage(2) Temperature Range Package(3)

MIC5327-2.8YMT 2O8 2.8V –40° to +125°C 4-Pin 1.2mm x 1.6mm Thin MLF®

MIC5327-1.8YMT 1Q8 1.8V –40° to +125°C 4-Pin 1.2mm x 1.6mm Thin MLF®

Note:

1. Pin 1 identifier = “▲”.

2. For other voltage options contact Micrel Marketing.

3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free.

Pin Configur ation

1VIN

GND

4 VOUT

EN32

4-Pin 1.2mm x 1.6mm Thin MLF® (MT)

Pin Description

Pin Number Pin Name Pin Function

1 VIN Supply Input.

2 GND Ground.

3 EN

Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave

floating.

4 VOUT Output Voltage.

HSPAD EPAD Exposed heatsink pad connected to ground internally.

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Absolute Maximum Ratings(1)

Supply Voltage (VIN)........................................ –0.3V to +6V

Enable Voltage (VEN)......................................... –0.3V to VIN

Power Dissipation (PD)........................... Internally Limited(3)

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

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

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

ESD Rating(4).................................................................. 2kV

Operating Ratings(2)

Supply Voltage (VIN)....................................... +2.3V to 5.5V

Enable Voltage (VEN).............................................. 0V to VIN

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

Junction Thermal Resistance

1.2mm x 1.6mm Thin MLF-4 (θJA) ............................173°C/W

Electrical Characteristics(5)

VIN = VEN = VOUT + 1V; COUT = CIN = 1µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C unless noted.

Parameter Condition Min Typ Max Units

Variation from nominal VOUT –1.5 +1.5 % Output Voltage Accuracy

Variation from nominal VOUT –2.0 +2.0 %

VIN = VOUT +1V to 5.5V, IOUT = 100µA 0.01 0.3 %/V Line Regulation

VIN = VOUT +1V to 5.5V, IOUT = 100µA 0.5 %/V

Load Regulation(6) I

OUT = 100µA to 300mA 0.05 1 %

Dropout Voltage(7) I

OUT = 50mA

IOUT = 100mA

IOUT = 150mA

IOUT = 300mA

180

150

300

Ground Pin Current(8) I

OUT = 100µA to 300mA 24 35 µA

Ground Pin Current in Shutdown VEN = 0V 0.01 1 µA

Ripple Rejection f = 1kHz; COUT = 1µF; IOUT = 300mA

f = 20kHz; COUT = 1µF; IOUT = 300mA

Current Limit VOUT = 0V 400 600 950 mA

Output Voltage Noise COUT = 1µF, 10Hz to 100kHz 90 µVRMS

Enable Voltage

Logic Low 0.2 V Enable Voltage

Logic High 1.2 V

VIL ≤ 0.2V 0.01 1 µA Enable Current

VIH ≥ 1.2V 0.01 1 µA

Turn-on Time COUT = 1µF; IOUT = 300mA 150 500 µs

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 TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power

dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.

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

5. Specification for packaged product only.

6. Regulation is measured at constant junction temperature using low duty cycle pulse testing.

7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT.

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

current.

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Typical Characteristics

Power Supply

Rejection Ratio

10 100 1k 10k 100k 1M

FREQUENCY (Hz)

VEN = 1.2V

VOUT = 2.8V

COUT = 1µF

150mA

100µA

50mA

100mA

300mA

0 50 100 150 200 250 300

OUTPUT CURRENT (mA)

Ground Current

vs. Output Curren t

VIN = VEN = 3.8V

VOUT = 2.8V

CIN = COUT = 1µF

3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

Ground C urrent

vs. Input Voltage

300mA 150mA

100µA

VIN = VEN = 3.8V

VOUT = 2.8V

CIN = COUT = 1µF

Ground Current

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VIN = VEN = 3.8V

VOUT = 2.8V

CIN = COUT = 1µF

300mA

100µA

150mA

2.0

2.5

3.0

3.5

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

Output Voltage

vs. Input Voltag e

VEN = VIN

VOUT = 2.8V

CIN = COUT = 1µF

100µA

50mA

300mA

150mA

2.70

2.75

2.80

2.85

2.90

Output Voltage

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VEN = VIN = 3.8V

CIN = COUT = 1µF

1.790

1.795

1.800

1.805

1.810

0 50 100 150 200 250 300

OUTPUT CURRENT (mA)

Output Voltage

vs. Output Curren t

VEN = VIN = 2.8V

CIN = COUT = 1µF

100

150

200

250

Dropout Voltage

vs. Temperature

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

VOUT = 2.8V

CIN = COUT = 1µF

ILOAD = 300mA

100

120

140

160

180

200

0 50 100 150 200 250 300

OUTPUT CURRENT (mA)

Dropout Voltage

vs. Output Current

VEN = VIN

CIN = COUT = 1µF

400

450

500

550

600

650

700

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

Current Limit

vs. Input Voltag e

VOUT = 2.8V

VEN = 1.2V

CIN = COUT = 1µF

0.01

0.1

100

Output Noise

Spectral D ensity

10 100 1k 10k 100k 1M

FREQUENCY (Hz)

VIN = 4.5V

VOUT = 2.8V

COUT = 1µF

ILOAD

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Functional Characteristics

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Functional Diagram

VIN

GND

VOUT

LDO

REFERENCE

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Applications Information

The MIC5327 is a low quiescent current, low dropout

regulator designed for optimal performance in a small

space. The MIC5327 regulator is fully protected from

damage due to fault conditions, offering linear current

limiting and thermal shutdown.

Input Supply Voltage

VIN provides the supply to power the LDO. The minimum

input voltage is 2.3V allowing conversion from typical

lithium ion batteries and low voltage supplies.

Input Capacitor

The MIC5327 is a high performance, high bandwidth

device; therefore it requires a well bypassed input supply

for optimal performance. A 1µF capacitor is required

from the input to ground to provide stability. Low ESR

ceramic capacitors provide optimal performance with

minimum space required. Additional high frequency

capacitors, such as small value NPO dielectric type

capacitors, help filter out high frequency noise and are

good practice in any RF circuit.

Output Capacitor

The MIC5327 requires an output capacitor of 1µF or

greater to maintain stability. The design is optimized for

use with low ESR ceramic chip capacitors. High ESR

capacitors may cause high frequency oscillation. The

output capacitor can be increased, but performance has

been optimized for a 1µF ceramic output capacitor.

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. 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.

Minimum Load Current

The MIC5327 does not require a minimum load to

maintain output voltage regulation.

Enable/Shutdown

The MIC5327 comes with an active high enable pin that

enables the regulator. 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. The active high enable pin

uses CMOS technology and cannot be left floating; a

floating enable pin may cause an unknown output state.

Thermal Considerations

The MIC5327 is designed to provide 300mA continuous

output current from a very small footprint package.

Maximum ambient operating temperature can be

calculated based on the output current and the voltage

drop across the part. For example: given that the input

voltage is 3.6V, the output voltage is 2.8V and the output

current is 300mA. The power dissipation of the regulator

circuit can be determined using the equation:

PD = (VIN – VOUT1) I OUT + VIN IGND

Because this device is CMOS and the ground current is

typically <100µA over the load range, the power

dissipation contributed by the ground current is < 1%

and can be ignored for this calculation.

D = (3.6V – 2.8V) × 300mA

D = 0.24W

To determine the maximum ambient operating

temperature use the junction to ambient thermal

resistance of the device and the following basic

equation:

⎟

⎠

⎞

⎜

⎝

⎛−

AJ(max)

D(max)

The maximum junction temperature of the die, TJ(max) =

125°C.The package thermal resistance, θJA = 173°C/W.

Substituting PD for PD(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.

For example, when operating the MIC5327 at an input

voltage of 3.6V and 300mA load with a minimum

footprint layout, the maximum ambient operating

temperature TA can be determined as follows:

0.24W = (125°C – TA)/(173°C/W)

A = 83°C

Therefore a 2.8V 300mA application can accept an

ambient operating temperature of 83.0°C in a 1.2mm x

1.6mm Thin MLF® package. 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

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VOUT

VIN

VOUT 4

GND 2

MIC5327-xxYMT

GND

1µF/6.3V

VIN

GND

1µF/6.3V

GND

Bill of Materials

Item Part Number Manufacturer Description Qty.

C1, C2 C1608X5R0J105K TDK(1) Capacitor, 1µF, 6.3V, X5R, Size 0603 2

U1 MIC5327-xxYMT Micrel, Inc.(3) 300mA Low operating current LDO 1

Notes:

1. TDK: www.tdk.com

2. Vishay Dale: Vishay.com

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

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PCB Layout Recommendations

Top Layer

Bottom Layer

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Package Information

4-Pin 1.2mm x 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

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.