MIC5353YMTTR - Micrel, Inc.

MIC5353

500mA LDO in 1.6mm × 1.6mm Package

ULDO 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

May 2010 M9999-052510

General Description

The MIC5353 is a high-performance, single-output, ultra-

low LDO (ULDO™) regulator, offering a low total output

noise of 30μVRMS. The MIC5353 is capable of sourcing

500mA output current and offers high-PSRR and low-

output noise, making it an ideal solution for RF

applications.

The MIC5353 provides 2% accuracy, extremely low

dropout voltage (160mV @ 500mA), and low ground

current (typically 90µA) making it ideal for battery-operated

applications. When disabled, the MIC5353 enters a zero-

off-mode current state, thereby drawing almost no current.

The MIC5353 is available in the 1.6mm x 1.6mm Thin

MLF® package, occupying only 2.56mm2 of PCB area, a

36% reduction in board area compared to SC-70 and 2mm

x 2mm Thin MLF® packages.

The MIC5353 has an operating junction temperature range

of –40°C to +125°C and is available in fixed and adjustable

output voltages in lead-free (RoHS-compliant) Thin MLF®

package.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• 500mA guaranteed output current

• Input voltage range: 2.6V to 6V

• Ultra low dropout voltage: 160mV @ 500mA

• ± 2% initial accuracy

• Ultra low output noise: 30µVrms

• Low quiescent current: 90µA

• Stable with ceramic output capacitors

• 35µs turn-on time

• Thermal shutdown and current limit protection

• Tiny 6-pin 1.6mm x 1.6mm Thin MLF® leadless package

Applications

• Mobile Phones

• GPS, PDAs, PMP, handhelds

• Portable electronics

• Digital still and video cameras

• Digital TV

_________________________________________________________________________________________________________________________

Typical Application

Portable Application

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Ordering Information

Part Number Marking Code(1) Output Voltage(2) Temperature Range Package

MIC5353-1.8YMT 18R 1.8V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

MIC5353-2.5YMT 25R 2.5V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

MIC5353-2.6YMT 26R 2.6V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

MIC5353-2.8YMT 28R 2.8V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

MIC5353-3.0YMT 30R 3.0V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

MIC5353-3.3YMT 33R 3.3V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

MIC5353YMT AAR ADJ –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF®

Notes:

1. Pin 1 identifier= “▲”.

2. For other voltage options contact Micrel Marketing.

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

Pin Configuration

6-Pin 1.6mm × 1.6mm Thin MLF® (MT)

Fixed

(TOP VIEW)

6-Pin 1.6mm × 1.6mm Thin MLF®(MT)

Adjustable

(TOP VIEW)

Pin Description

Pin Number

Thin MLF-6

Fixed

Pin Number

Thin MLF-6

Adjustable

Pin Name Pin Function

1 1 EN Enable Input. Active High. High = ON, low = OFF. Do not leave floating.

2 2 GND Ground.

3 3 VIN Supply Input.

4 4 VOUT Output Voltage.

5 – NC No connection.

– 5 ADJ Adjust Input. Connect to external resistor voltage divider network.

6 6 BYP

Reference Bypass: Connect external 0.1μF to GND for reduced Output Noise. May

be left open.

EPad EPad HS PAD Exposed Heat-sink Pad connected to ground internally.

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Absolute Maximum Ratings(1)

Supply Voltage (VIN)..................................... −0.3V to +6.5V

Enable Input Voltage (VEN)................................−0.3V to VIN

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

Lead Temperature (soldering, 3sec)..........................260°C

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

ESD Rating(4)................................................................. 2KV

Operating Ratings(2)

Supply Voltage (VIN) ...................................... +2.6V to +6.0V

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

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

Junction Thermal Resistance

6-Pin 1.6mm x1.6mm Thin MLF® (θJA) ...........92.4°C/W

Electrical Characteristics(5)

VIN = VOUT + 1.0V; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.

Parameter Conditions Min. Typ. Max. Units

Variation from nominal VOUT -2.0 +2.0

Output Voltage Accuracy Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 %

0.05 0.3

Line Regulation VIN = VOUT + 1V to 6V; IOUT = 100µA

0.6 %/V

Load Regulation IOUT = 100µA to 500mA 0.15 2.0 %

IOUT = 150mA 50 100

IOUT = 300mA 100 200

Dropout Voltage (6)

IOUT = 500mA 160 350

Ground Pin Current IOUT = 0 to 500mA 90 175 µA

Ground Pin Current in Shutdown VEN ≤ 0.2V 0.01 2 µA

f = 1kHz; COUT = 1.0µF; CBYP = 0.1µF 60 dB

Ripple Rejection f = 20kHz; COUT = 1.0µF; CBYP = 0.1µF 45

Current Limit VOUT = 0V 600 1100 1600 mA

Output Voltage Noise COUT = 1.0µF; CBYP = 0.1µF; 10Hz to 100kHz 30 µVRMS

Enable Input

Logic Low 0.2

Enable Input Voltage Logic High 1.2

VIL ≤ 0.2V 0.01 1

Enable Input Current VIH ≥ 1.2V 0.01 1 µA

Turn-on Time

Turn-on Time COUT = 1.0µF; CBYP = 0.1µF 35 100 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. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V

differential.

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Functional Diagram

MIC5353 Block Diagram – FIXED

MIC5353 Block Diagram – ADJUSTABLE

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Typical Characteristics

Dropout Voltage

vs. Output Current

100

120

140

160

180

200

0 50 100 150 200 250 300 350 400 450 500

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (mV)

Dropout Voltage

vs. Temperature

100

150

200

250

-40 -20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

DROPOUT VOLTAGE (mV

)

150mA

500mA

300mA

Ground Current

vs. Output Current

0 100 200 300 400 500

Output Current(mA)

Ground Current(μA)

OUT

= 2.8V

= 3.8V

Ground Current

vs. Temperature

100

110

120

-40 -20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

GROUND CURRENT (μA)

OUT

= 500mA

OUT

= 100μA

Output Voltage

vs. Output Current

1.76

1.77

1.78

1.79

1.8

1.81

1.82

1.83

1.84

0 50 100 150 200 250 300 350 400 450 500

OUTPUT CURRENT(mA)

OUTPUT VOLTAGE(V)

VIN=2.8V

COUT=CIN=1μF

Current Limit

vs. Input Voltage

0.8

0.9

1.1

1.2

1.3

1.4

2.533.544.55 5.56

INPU T VO LT AGE(V)

CURRENT LIMIT(mA)

OUT

=2.8V

OUT

=1μF

PSRR

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

10 100 1,000 10,000 100,000 1,000,000 10,000,000

FREQUENCY (Hz)

100µA

300µA

500µA

OUT

= 1µF

BYP

= 0.1µF

Output Noise Spectral Density

0.001

0.01

0.1

10 100 1,000 10,000 100,000 1,000,000 10,000,000

FREQUENCY (Hz)

Noise uV/√Hz

VIN = 4.5V

COUT = 1µF

VOUT = 1.8V

ILOA D = 50mA

CBYP = 0.1µF

Output Voltage

vs. Input Voltage

2.2

2.4

2.6

2.8

3.2

3.4

3.6

2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

150mA

100μA

300mA

500mA

OUT

= 2.8V

= C

OUT

= 1μF

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Functional Characteristics

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Applications Information

Enable/Shutdown

The MIC5353 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. The active-high

enable pin uses CMOS technology and the enable pin

cannot be left floating; a floating enable pin may cause

an indeterminate state on the output.

Input Capacitor

The MIC5353 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 at a minimum of space. The use of

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.

Output Capacitor

The MIC5353 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, although

performance has been optimized for a 1µF ceramic

output capacitor and doing so does not improve

significantly with larger capacitance.

X7R/X5R dielectric-type ceramic capacitors are

recommended because of their temperature

performance. The 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 thereby

ensuring the same minimum capacitance over the

equivalent operating temperature range.

Bypass Capacitor

A capacitor can be placed from the noise bypass pin-to-

ground to reduce output voltage noise. The capacitor

bypasses the internal reference. A 0.1μF capacitor is

recommended for applications that require low-noise

outputs. The bypass capacitor can be increased, further

reducing noise and improving PSRR. Turn-on time

increases slightly with respect to bypass capacitance.

A unique, quick-start circuit allows the MIC5353 to drive

a large capacitor on the bypass pin without significantly

slowing turn-on time.

No-Load Stability

Unlike many other voltage regulators, the MIC5353 will

remain stable and in regulation with no load. This is

especially important in CMOS RAM keep-alive

applications.

Adjustable Regulator Application

Adjustable regulators use the ratio of two resistors to

multiply the reference voltage to produce the desired

output voltage. The MIC5353 can be adjusted from

1.25V to 5.5V by using two external resistors (Figure 1).

The resistors set the output voltage based on the

following equation:

⎟

⎠

⎞

⎜

⎝

⎛+= R2

1VV REFOUT

REF = 1.25V

Figure 1. Adjustable Voltage Output

Thermal Considerations

The MIC5353 is designed to provide 500mA of

continuous current. Maximum ambient operating

temperature can be calculated based on the output

current and the voltage drop across the part. Given that

the input voltage is 3.3V, the output voltage is 2.8V and

the output current = 500mA.

The actual power dissipation of the regulator circuit can

be determined using the equation:

D = (VIN – VOUT) IOUT + VIN IGND

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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 = (3.3V – 2.8V) × 500mA

D = 0.25W

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:

PD(MAX) =

TJ(MAX) - TA

⎝

⎛

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

the die θJA thermal resistance = 92.4°C/W.

Thermal Resistance

Substituting PD for PD(max) and solving for the ambient

operating temperature will give the maximum operating

conditions for the regulator circuit. The junction-to-

ambient thermal resistance for the minimum footprint is

92.4°C/W.

The maximum power dissipation must not be exceeded

for proper operation.

For example, when operating the MIC5353-2.8YMT at

an input voltage of 3.3V and 500mA load with a

minimum footprint layout, the maximum ambient

operating temperature TA can be determined as follows:

0.25W = (125°C – TA)/(92.4°C/W)

A=101°C

Therefore, a 2.8V application with 500mA of output

current can accept an ambient operating temperature of

101°C in a 1.6mm 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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Typical Application Schematic (Fixed Output)

Bill of Materials

Item Part Number Manufacturer Description Qty.

06036D105KAT2A AVX(1)

C1,C3 GRM188R60J105KE19D muRata(2) Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2

06035C104KAT2A AVX(1)

C2 GRM188R71H104KA93D muRata(2) Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1

U1 MIC5353-XXYMT Micrel, Inc.(3) 500mA LDO, 1.6mm x 1.6mm Thin MLF® 1

Notes:

1. AVX: www.avx.com.

2. Murata Tel: www.murata.com.

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

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Typical Application Schematic (Adjustable Output)

Bill of Materials

Item Part Number Manufacturer Description Qty.

06036D105KAT2A AVX(1)

C1,C3 GRM188R60J105KE19D muRata(2) Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2

06035C104KAT2A AVX(1)

C2 GRM188R71H104KA93D muRata(2) Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1

R1 CRCW060320K0FKEA Vishay(3) Resistor, 20kΩ, 1%, 1/16W, Size 0603 1

R2 CRCW060310K0FKEA Vishay(3) Resistor, 10kΩ, 1%, 1/16W, Size 0603 1

U1 MIC5353YMT Micrel, Inc.(4) Adjustable 500mA LDO, 1.6mm x 1.6mm Thin MLF® 1

Notes:

1. AVX: www.avx.com.

2. Murata Tel: www.murata.com.

3. Vishay Tel: www.vishay.com.

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

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PCB Layout Recommendations

TOP LAYER

BOTTOM LAYER

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Package Information

6-Pin 1.6mm 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.