MIC5319YMLTR - Micrel, Inc.

MIC5319

500mA µCap Ultra-Low Dropout

High PSRR LDO Regulator

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

General Description

The MIC5319 is a high-performance, 500mA LDO

regulator, offering extremely high PSRR and very-low

noise while consuming low ground current.

Ideal for battery-operated applications, the MIC5319

features 1% accuracy, extremely low-dropout voltage

(200mV @ 500mA), and low ground current at light load

(typically 90µA). Equipped with a logic-compatible enable

pin, the MIC5319 can be put into a zero-off-mode current

state, drawing no current when disabled.

The MIC5319 is a µCap design operating with very-small

ceramic output capacitors for stability, thereby reducing

required board space and component cost.

The MIC5319 is available in fixed-output voltages and

adjustable output voltages in the super-compact 2mm x

2mm MLF® leadless package and thin SOT-23-5 package.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Ultra-low dropout voltage 200mV @ 500mA

• Input voltage range: 2.5 to 5.5V

• Stable with ceramic output capacitor

• Low output noise: 40µVrms

• Low quiescent current of 90µA total

• High PSRR, up to 70dB @1kHz

• Fast turn-on-time: 40µs typical

• High-output accuracy:

− ±1.0% initial accuracy

− ±2.0% over temperature

• Thermal-shutdown protection

• Current-limit protection

• Logic-controlled Enable

• Tiny 2mm x 2mm MLF® package, 500mA continuous

• Thin SOT-23-5 package, 500mA peak

Applications

• Cellular phones

• PDAs

• Fiber optic modules

• Portable electronics

• Notebook PCs

• Audio Codec power supplies

Typical Application

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Ordering Information

Part Number Marking

Standard Pb-Free Standard Pb-Free(1)

Voltage(2)

(V)

Junction

Temperature

Range Package

MIC5319-1.3HYML 3H1 1.375 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-1.8BML MIC5319-1.8YML 918 189 1.8 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-1.85YML 1J9 1.85 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-2.5BML MIC5319-2.5YML 925 259 2.5 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-2.6YML 269 2.6 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-2.7YML 279 2.7 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-2.8BML MIC5319-2.8YML 928 289 2.8 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-2.9YML 299 2.9 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-3.0YML 309 3.0 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-3.3BML MIC5319-3.3YML 933 339 3.3 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-5.0BML MIC5319-5.0YML 950 509 5.0 −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319BML MIC5319YML 9AA AA9 ADJ −40°C to +125°C 6-Pin 2mm × 2mm MLF®

MIC5319-1.3HYD5 N13H 1.375

−40°C to +125°C Thin SOT-23-5

MIC5319-1.8YD5 N918 1.8

−40°C to +125°C Thin SOT-23-5

MIC5319-1.85YD5 N91J 1.85

−40°C to +125°C Thin SOT-23-5

MIC5319-2.5YD5 N925 2.5

−40°C to +125°C Thin SOT-23-5

MIC5319-2.6YD5 N926 2.6

−40°C to +125°C Thin SOT-23-5

MIC5319-2.7YD5 N927 2.7

−40°C to +125°C Thin SOT-23-5

MIC5319-2.8BD5 MIC5319-2.8YD5 N928 N928 2.8

−40°C to +125°C Thin SOT-23-5

MIC5319-2.9YD5 N929 2.9

−40°C to +125°C Thin SOT-23-5

MIC5319-3.0YD5 N930 3.0

−40°C to +125°C Thin SOT-23-5

MIC5319-3.3BD5 MIC5319-3.3YD5 N933 N933 3.3

−40°C to +125°C Thin SOT-23-5

MIC5319-5.0YD5 N950 5.0

−40°C to +125°C Thin SOT-23-5

Notes:

1. Under-bar/Over-bar symbols may not be to scale.

2. For other output voltage options, contact Micrel Marketing.

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Pin Configur ation

MIC5319-x.xBML/YML

6-Pin 2mm × 2mm MLF® (ML)

Top View

MIC5319BML/YML (Adjustable)

6-Pin 2mm × 2mm MLF® (ML)

Top View

MIC5319-x.xBD5/YD5

TSOT-23-5 (D5)

Top View

Pin Description

Pin Number

MLF®-6

Fixed

Pin Number

MLF®-6

Adjustable

Pin Number

TSOT-23-5

Fixed Pin Name Pin Name

1 1 3 EN

Enable Input: Active High. High = ON, Low = OFF. Do not leave

floating.

2 2 2 GND Ground.

3 3 1 VIN Supply Input.

4 4 5 VOUT Output Voltage.

− 5 − ADJ Adjustable Input: Connect to external resistor voltage divider

network.

5 − NC No connection for fixed voltage parts

6 6 4 BYP

Reference Bypass: Connect external 0.1µF to GND for reduced

output noise. May be left open.

HS Pad HS pad − EPAD Exposed Heatsink Pad connected to ground internally

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Absolute Maximum Ratings(1)

Supply Input Voltage (VIN)...................................... 0V to 6V

Enable Input Voltage (VEN)..................................... 0V to 6V

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

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

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

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

ESD Rating(4).................................................................. 3kV

Operating Ratings(2)

Supply Input Voltage (VIN)............................ +2.5V to +5.5V

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

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

Package Thermal Resistance

MLF® (θJA)..........................................................93°C/W

TSOT-23 (θJA)..................................................235°C/W

Electrical Characteristics(4)

VIN = VOUT +1.0V; COUT = 2.2µF; 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 −1.0 +1.0

Output Voltage Accuracy

Variation from nominal VOUT, IOUT = 100mA to 500mA −2.0 +2.0 %

1.2375 1.25 1.2625 Feedback Voltage

(ADJ Option) 1.225 1.25 1.275 V

Line Regulation VIN = VOUT +1V to 5.5V 0.04

0.3 %/V

Load Regulation(6) I

OUT = 100µA to 500mA 0.1 0.5 %

IOUT = 50mA 20 40

Dropout Voltage(7, 8) IOUT = 500mA 200 400 mV

Ground Pin Current(9) I

OUT = 0 to 500mA 90 150 µA

Ground Pin Current in

Shutdown VEN ≤ 0.2V 0.5 µA

f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF 70

Ripple Rejection f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF 60 dB

Current Limit VOUT = 0V 600 700 mA

Output Voltage Noise COUT = 2.2µF; CBYP = 0.1 µF; 10Hz to 100kHz 40 µVrms

Turn-On Time COUT = 2.2µF; CBYP = 0.1 µF 40 100 µs

Logic Low (Regulator Shutdown) 0.2

Enable Input Voltage Logic High (Regulator Enabled) 1.2 V

VIL = ≤ 0.2V (Regulator Shutdown) 0.01

Enable Input Current

VIH = ≥ 1.0V (Regulator Shutdown) 0.01

1 µA

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 may go into thermal shutdown.

4. Devices are ESD sensitive. Handling precautions recommended. Human body model.

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. For outputs below 2.5V,

dropout voltage spec does not apply, as part is limited by minimum VIN spec of 2.5V. There may be some typical dropout degradation at VOUT <3V.

8. For ADJ option, VOUT = 3V for dropout specification.

9. 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

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Typical Characteristics (Continued)

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Functional Characteristics

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Functional Diagram

MIC5319 Block Diagram − Fixed

MIC5319 Block Diagram − Adjustable

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Applications Information

Enable/Shutdown

The MIC5319 features 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, as this may cause an

indeterminate state on the output.

Input Capacitor

The MIC5319 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. Additional high-

frequency capacitors, such as small-valued NPO

dielectric-type capacitors, help filter out high-frequency

noise and are good design practice in any RF-based

circuit.

Output Capacitor

The MIC5319 requires an output capacitor of 2.2µF 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 2.2µF ceramic output capacitor and

does not improve significantly with larger capacitance.

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.

Bypass Capacitor

A capacitor can be placed from the 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 MIC5319 to drive

a large capacitor on the bypass pin without significantly

slowing turn-on time. Refer to the “Typical

Characteristics” section for performance with different

bypass capacitors.

No-Load Stability

Unlike many other voltage regulators, the MIC5319 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 MIC5319 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:

VOUT = VREF ⎟

⎠

⎞

⎜

⎝

⎛+R2

VREF = 1.25V

Figure 1. Adjustable Voltage Application

Thermal Considerations

The MIC5319 is designed to provide 500mA of

continuous current in a very small MLF® package.

Maximum ambient operating temperature can be

calculated based on the output current and the voltage

drop across the part. Given an input voltage of 3.3V,

output voltage of 2.8V and output current = 500mA, the

actual power dissipation of the regulator circuit can be

determined using the equation:

PD = (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:

Substituting 0.25W 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.

PD = (3.3V − 2.8V) × 500mA

0.25W = C/W93

TC125 A

−°

PD = 0.25W

TA = 101.75°C

Therefore, a 2.8V application at 500mA of output current

can accept an ambient operating temperature of

101.75°C in a 2mm x 2mm 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: www.micrel.com/_PDF/other/LDOBk_ds.pdf

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) = ⎟

⎠

⎞

⎜

⎝

⎛−

T(max)T

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

the die. θJA thermal resistance = 93°C/W.

Table 1 shows junction-to-ambient thermal resistance for

the MIC5319 in the 2mm x 2mm MLF® package.

Package θJA Recommended

Minimum Footprint θJC

2mm × 2mm MLF® 93°C/W 45°C/W

SOT-23-5 235°C/W

Table 1. Thermal Resistan ce

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Package Information

6-Pin 2mm × 2mm MLF® (ML)

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Package Information (Continued)

TSOT-23-5 (D5)

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

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical impla

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.

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