Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsPMICsPMIC - LDO voltage regulator Positive, fixed SOT 23 5

June 2009 1 M0371-061809

Micrel, Inc. MIC5219

Typical Applications

MIC5219

500mA-Peak Output LDO Regulator

General Description

The MIC5219 is an efcient linear voltage regulator with high

peak output current capability, very-low-dropout voltage, and

better than 1% output voltage accuracy. Dropout is typically

10mV at light loads and less than 500mV at full load.

The MIC5219 is designed to provide a peak output current for

start-up conditions where higher inrush current is demanded.

It features a 500mA peak output rating. Continuous output

current is limited only by package and layout.

The MIC5219 can be enabled or shut down by a CMOS or

TTL compatible signal. When disabled, power consumption

drops nearly to zero. Dropout ground current is minimized to

help prolong battery life. Other key features include reversed-

battery protection, current limiting, overtemperature shutdown,

and low noise performance with an ultra-low-noise option.

The MIC5219 is available in adjustable or xed output volt-

ages in the space-saving 6-pin (2mm × 2mm) MLF

, 6-pin

(2mm × 2mm) Thin MLF

SOT-23-5 and MM8

8-pin power

MSOP packages. For higher power requirements see the

MIC5209 or MIC5237.

All support documentation can be found on Micrel’s web site

at www.micrel.com.

Features

• 500mA output current capability

SOT-23-5 package - 500mA peak

2mm×2mm MLF

package - 500mA continuous

2mm×2mm Thin MLF

package - 500mA

continuous

MSOP-8 package - 500mA continuous

• Low 500mV maximum dropout voltage at full load

• Extremely tight load and line regulation

• Tiny SOT-23-5 and MM8™ power MSOP-8 package

• Ultra-low-noise output

• Low temperature coefcient

• Current and thermal limiting

• Reversed-battery protection

• CMOS/TTL-compatible enable/shutdown control

• Near-zero shutdown current

Applications

• Laptop, notebook, and palmtop computers

• Cellular telephones and battery-powered equipment

• Consumer and personal electronics

• PC Card V

and V

regulation and switching

• SMPS post-regulator/DC-to-DC modules

• High-efciency linear power supplies

MIC5219-5.0BMM

2.2µF

tantalum

OUT

ENABLE

SHUTDOWN

470pF

5V Ultra-Low-Noise Regulator

2.2µF

tantalum

470pF

OUT

3.3V

MIC5219-3.3BM5

ENABLE

SHUTDOWN

3.3V Ultra-Low-Noise Regulator

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

MM8 is a registered trademark of Micrel, Inc.

MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc..

ENABLE

SHUTDOWN

MIC5219-x.xYML

BYP

(optional)

OUT

Ultra-Low-Noise Regulator (Fixed)

ENABLE

SHUTDOWN

MIC5219YMT

470pF

OUT

2.2µF

Ultra-Low-Noise Regulator (Adjustable)

Summary of content (14 pages)

PAGE 1
Micrel, Inc. MIC5219 MIC5219 500mA-Peak Output LDO Regulator General Description Features The MIC5219 is an efficient linear voltage regulator with high peak output current capability, very-low-dropout voltage, and better than 1% output voltage accuracy. Dropout is typically 10mV at light loads and less than 500mV at full load.
PAGE 2
Micrel, Inc. MIC5219 Ordering Information Part Number Standard Pb-Free MIC5219-2.5BMM MIC5219-2.5YMM Marking Standard Pb-Free* Volts Temp. Range Package — — 2.5V –40°C to +125°C MSOP-8 MIC5219-2.85BMM MIC5219-2.85YMM — — 2.85V –40°C to +125°C MSOP-8 MIC5219-3.0BMM MIC5219-3.0YMM — — 3.0V –40°C to +125°C MSOP-8 MIC5219-3.3BMM MIC5219-3.3YMM — — 3.3V –40°C to +125°C MSOP-8 MIC5219-3.6BMM MIC5219-3.6YMM — — 3.6V –40°C to +125°C MSOP-8 MIC5219-5.0BMM MIC5219-5.
PAGE 3
Micrel, Inc. MIC5219 Pin Description Pin No. MLF-6 TMLF-6 Pin No. MSOP-8 Pin No. SOT-23-5 Pin Name Pin Function 3 2 1 IN Supply Input. 2 5–8 2 GND Ground: MSOP-8 pins 5 through 8 are internally connected. 4 3 5 OUT Regulator Output. 1 1 3 EN Enable (Input): CMOS compatible control input. Logic high = enable; logic low or open = shutdown. 6 4 (fixed) 4 (fixed) BYP Reference Bypass: Connect external 470pF capacitor to GND to reduce output noise. May be left open.
PAGE 4
Micrel, Inc. MIC5219 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input Voltage (VIN)...............................–20V to +20V Power Dissipation (PD).............................. Internally Limited Junction Temperature (TJ)......................... –40°C to +125°C Storage Temperature (TS)......................... –65°C to +150°C Lead Temperature (Soldering, 5 sec.)........................ 260°C Supply Input Voltage (VIN)............................. +2.
PAGE 5
Micrel, Inc. MIC5219 Notes: 1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA.
PAGE 6
Micrel, Inc.
PAGE 7
Micrel, Inc. MIC5219 Ground Current vs. Output Current Ground Current vs. Supply Voltage Ground Current vs. Supply Voltage 12 3.0 25 10 2.5 20 8 2.0 15 6 1.5 10 4 2 5 0 0 0 June 2009 100 200 300 400 OUTPUT CURRENT (mA) 500 IL =100 mA 1.0 0.
PAGE 8
Micrel, Inc. MIC5219 Block Diagrams VIN OUT IN VOU T COU T BYP CB Y P (optional) Bandgap Ref. V REF EN Current Limit Thermal Shutdown MIC5219-x.xBM5/M/YMT GND Ultra-Low-Noise Fixed Regulator VIN OUT IN VOU T R1 R2 Bandgap Ref.
PAGE 9
Micrel, Inc. MIC5219 Applications Information Thermal Considerations The MIC5219 is designed to provide 200mA of continuous current in two very small profile packages. 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 thermal resistance, junction-to-ambient, of the device and the following basic equation.
PAGE 10
Micrel, Inc. MIC5219 Peak Current Applications xBMM, the power MSOP package part. These graphs show three typical operating regions at different temperatures. The lower the temperature, the larger the operating region. The graphs were obtained in a similar way to the graphs for the MIC5219-x.xBM5, taking all factors into consideration and using two different board layouts, minimum footprint and 1" square copper PC board heat sink.
PAGE 11
Micrel, Inc. MIC5219 10 10 10 100mA 8 6 4 400mA 20 40 60 80 DUTY CYCLE (%) 100 0 500mA a. 25°C Ambient 20 300mA 2 500mA 400mA 0 200mA 4 300mA 2 500mA 0 6 200mA 300mA 2 100mA 8 6 200mA 4 0 100mA 8 40 60 80 DUTY CYCLE (%) 100 0 400mA 0 b. 50°C Ambient 20 40 60 80 DUTY CYCLE (%) 100 c. 85°C Ambient Figure 1. MIC5219-x.
PAGE 12
Micrel, Inc. MIC5219 PD × 50mA = 0.875 × 173mW VIN PD × 50mA = 151mW The power dissipation at 500mA must also be calculated. PD × 500mA = (5V – 3.3V) 500mA + 5V × 20mA IN EN This number must be multiplied by the duty cycle at which it would be operating, 12.5%. 2.2µF Figure 6. Ultra-Low-Noise Fixed Voltage Regulator PD × = 0.125 × 950mW Figure 6 includes the optional 470pF noise bypass capacitor between BYP and GND to reduce output noise.
PAGE 13
Micrel, Inc.
PAGE 14
Micrel, Inc. MIC5219 6-Pin MLF® (ML) 6-Pin Thin MLF® (MT) MICREL, INC. tel 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 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.