MIC2215-AAAYML-TR - MICROCHIP TECHNOLOGY

MIC2215

Triple High PSRR, Low Noise µCap LDO

MLF and MicroLeadFrame are re gistered 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

January 2007

1 M9999-011207

General Description

The MIC2215 is a high performance, triple LDO voltage

regulator, with each regulator capable of providing 250mA

continuous output curre nt.

Ideal for battery operated applications, the MIC2215 offers

1% initial accuracy, extremely low dropout voltage (100mV

@ 150mA), and low ground current at light load (typically

110µA per regulator). Equipped with a noise bypass pin

and featuring very high power supply ripple rejection

(PSRR) of up to 80dB, the MIC2215 provides the lowest

noise and highest efficiency solution for RF applications in

portable electronics such as cellular phones and wireless

LAN applications.

Equipped with TTL logic-compatible enable pins, each of

the regulators in the MIC2215 can be put into a zero

current off mode where the supply current is much less

than 1µA when all the regulators are disabled. The

MIC2215 is a µCap design, which enables a stable output

with small ceramic output capacitors, reducing both cost

and required board sp ace for output bypassing.

The MIC2215 is available in the miniature 16-pin,

(4mm×4mm) MLF

package.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Input voltage range: +2.25V to +5.5V

• 70dB PSRR

• Stable with ceramic output capacitor

• High output accuracy:

– ±1.0% initial accuracy

– ±2.0% over temperature

• Low dropout voltage of 100mV@150mA

• Low quiescent current:110µA per regulator

• Fast turn-on time:30µs

• Zero off-mode current

• Thermal shutdown protection

• Current-limit protection

• Tiny 16-pin (4mm × 4mm) MLF

package

Applications

• Cellular phones

• PCs and peripherals

• Wireless LAN cards

• PDAs

• GPS

___________________________________________________________________________________________________________

Typical Application

VIN1

VIN2

VIN3 VOUT3

EN1

EN2

EN3

OUT

= 1µF

Ceramic

= 1µF

Ceramic

CBYP

VOUT1

VOUT2

GND

MIC2215-xxx_ML

OFF ON

Rx Chain

Tx Chain

Synth/TCXO/VCO

Micrel, Inc. MIC2215

January 2007

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Ordering Information

Part Number Part Number

Standard Pb-Free

Voltage

(1)

1/V

2/V

3) Junction

Temp. Range Package

MIC2215-MMMBML MIC2215-MMMYML 2.8V/2.8V/2.8V –40° to +125°C 16-Pin 4mm x 4mm MLF

MIC2215-PMMBML MIC2215-PMMYML 3.0V/2.8V/2.8V –40° to +125°C 16-Pin 4mm x 4mm MLF

MIC2215-PPGBML MIC2215-PPGYML 3.0V/3.0V/1.8V –40° to +125°C 16-Pin 4mm x 4mm MLF

MIC2215-PPMBML MIC2215-PPMYML 3.0V/3.0V/2.8V –40° to +125°C 16-Pin 4mm x 4mm MLF

MIC2215-PPPBML MIC2215-PPPYML 3.0V/3.0V/3.0V –40° to +125°C 16-Pin 4mm x 4mm MLF

MIC2215-AAABML MIC2215-AAAYML Adj./Adj./Adj. –40° to +125°C 16-Pin 4mm x 4mm MLF

Note:

For other voltage options, contact Micrel for details.

Voltage Code

Adj. A

1.5 F

1.6 W

1.8 G

1.85 D

1.9 Y

2.0 H

2.1 E

2.5 J

2.6 K

2.65 I

2.7 L

2.8 M

2.85 N

2.9 O

3.0 P

3.1 Q

3.2 R

3.3 S

3.4 T

3.5 U

3.6 V

Table 1. Voltage Codes

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January 2007

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Pin Configur ation

OUT1

VIN1

VIN2

OUT2

VIN3

GND

BYP

OUT3

OUT1

EN3

EN2

EN1

OUT2

OUT1

VIN1

VIN2

OUT2

VIN3

GND

BYP

OUT3

ADJ3

ADJ1

OUT1

EN3

EN2

EN1

DJ2

MIC2215-xxx_ML (ML)

(Fixed) MIC2215-AAA_ML (ML)

(Adjustable)

Pin Description

Pin Number Pin Name Pin Function

1 VOUT1 Output voltage of regulator 1 (250mA). Connect externally to pin 16.

2 VIN1 Supply input of regulator 1 (highest input voltage required for common circuitry).

3 VIN2 Supply input of regulator 2.

4 VOUT2

Output voltage of regulator 2 (250mA). For fixed output device, connect pi ns 4

and 5 externally.

VOUT2

(Fixed) Output voltage of regulator 2 (250mA). For fixed output device, connect pi ns 4

and 5 externally.

5 ADJ2

(Adj.) Adjust Input. Feedback input for regulator 2.

6 EN1

Enable input to regulator 1. Enables regulator 1 output. Active hig h input.

High = on, low = off.

7 EN2

Enable input to regulator 2. Enables regulator 2 output. Active high input.

High = on, low = off.

8 EN3

Enable input to regulator 3. Enables reg ulator 3 output. Active high input.

High = on, low = off.

9 CBYP

Reference Bypass: Connect external 0.01µF to GND to reduce output noise.

May be left open.

10 GND Ground.

11 GND Ground.

12 VIN3 Supply input of regulator 3.

13 VOUT3

Output voltage of regulator 3 (250mA). For fixed output device, connect pi ns 13

and 14 externally.

VOUT3

(Fixed) Output voltage of regulator 3 (250mA). For fixed output device, connect pi ns 13

and 14 externally.

14 ADJ3

(Adj.) Adjust Input. Feedback input for regulator 3.

(Fixed) No Connect. Not internally conn ected.

15 ADJ1

(Adj.) Adjust Input. Feedback input for regulator 1.

16 VOUT1 Output voltage of regulator 1 (250mA). Connect exter nally to pin 1.

Exposed Pad GND Ground.

Micrel, Inc. MIC2215

January 2007

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Absolute Maximum Ratings(1)

Supply Voltage (V

)............................................... 0V to 7V

Enable Voltage (V

).............................................. 0V to 7V

Power Dissi pation (P

)...........................Internally Limited

(3)

Junction Temperature (T

) ........................–40°C to +125°C

Storage Temperature (T

).........................–65°C to +150°C

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

ESD Rating

(4)

Operating Ratings(2)

Supply Voltage

IN1

) ........................................................ 2.25V to 5.5V

IN2

, V

IN3

) ..................................................2.25V to V

IN1

Enable Voltage (V

).............................................0V to V

IN1

Junction Temperature (T

) ........................–40°C to +125°C

Package Thermal Resistance

4x4 MLF-16 (θ

) ...............................................45°C/W

Electrical Characteristics(5)

IN1

= V

IN2

= V

IN3

= V

OUT

(highest nominal) +1.0V; C

OUT

= 1.0µF, I

OUT

= 100µA; T

= 25°C, bold values indicate

–40°C to + 125°C; unless noted.

Parameter Condition Min Typ Max Units

Output Voltage Accuracy –1

–2 +1

+2 %

Output Voltage Temp.

Coefficient 40 ppm/C

Line Regulation V

= V

OUT

+1V to 5.5V 0.015 0.3 %/V

Load Regulation I

OUT

= 100µA to 250mA 0.3 0.5 %

OUT

= 100µA 2 mV

OUT

= 50mA 32 mV

OUT

= 100mA 63 mV

OUT

= 150mA 100 150 mV

Dropout Voltage

OUT

= 250mA 170 275 mV

OUT1

= I

OUT2

= I

OUT3

= 100µA 280 400 µA

OUT1

= 100µA; I

OUT2

OUT3

= off 110 150 µA

Ground Current

OUT1

= I

OUT2

= I

OUT3

= 250mA 420 550 µA

Quiescent Current V

EN1

= V

EN2

= V

EN3

= 0V 0.2 1 µA

= V

OUT

+1.0V; I

OUT

= 150mA, f = 0.1kHz to 1kHz, C

BYP

= 0.1µF 70 dB

= V

OUT

+0.4V; I

OUT

= 150mA, f = 0.1kHz to 1kHz, C

BYP

= 0.1µF 60 dB

Ripple Rejection

= V

OUT

+0.2V, I

OUT

= 150mA, f = 0.1kHz to 1kHz, C

BYP

= 0.1µF 45 dB

Current Limit V

OUT

= 0V (All regulators) 350 700 mA

Output Voltage Noise C

BYP

= 0.1µF, f = 10Hz to 100kHz 30 µV

RMS

Turn-On Time C

BYP

= 0.01µF 30 100 µs

Enable Input

Logic Low (Regulator shutdown) 0.4 V Enable Input Voltage Logic High (Regulator enable d) 1.5 V

< 0.4V (Regulator shutdown) 1.0 µA Enable Input Current V

> 1.5V (Regulator enabled) 0.01 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 T

(ambient temperature) is P

D(max)

= (T

J(max)

– T

) ÷ θ

. 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.

5. Specification for packaged product only.

Micrel, Inc. MIC2215

January 2007

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Typical Characteristics

TA = +25°C, unless otherwise noted

Micrel, Inc. MIC2215

January 2007

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Typical Characteristics (cont.)

Micrel, Inc. MIC2215

January 2007

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Typical Characteristics (cont.)

Micrel, Inc. MIC2215

January 2007

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Functional Diagram

VIN1

Current

Limit

EN1

Error

Amp

VIN2

Current

Limit

EN2

Error

Amp

VIN3

Current

Limit

EN3

Error

Amp

Quick-

Start

REF

GND

VOUT1

VOUT2

VOUT3

BYP

Thermal

Limit

ADJ1

ADJ2

ADJ3

VIN1

Current

Limit

EN1

Error

Amp

VIN2

Current

Limit

EN2

Error

Amp

VIN3

Current

Limit

EN3

Error

Amp

Quick-

Start

REF

GND

VOUT1

VOUT2

VOUT3

BYP

Thermal

Limit

MIC2215 Block Diagram

(Adjustable) MIC2215 Block Diagram

(Fixed)

Functional Description

The MIC2215 is a triple, low noise CMOS LDO.

Designed specifically for noise-critical applications in

handheld or battery-powered devices, the MIC2215

comes equipped with a noise reduction feature to filter

the output noise via an external capacitor. Other features

of the MIC2215 include a separate logic compatible

enable pin for each channel, current limit, thermal

shutdown, and ultra-fast transient response, all within a

small MLF

package.

The MIC2215 is specifically designed to work with low-

ESR ceramic capacitors, reducing the amount of board

space necessary for power applications, which is critical

in hand-held wireless devi ce s.

Micrel, Inc. MIC2215

January 2007

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Application Information

Enable/Shutdown

The MIC2215 comes with three active-high enable pins

that allow control of each individual regulator to be either

disabled or enabled. Forcing the enable pin low disables

the respective regulator and sends it into a “zero” off-

mode-current state. In this state, current consumed by

the individual regulator goes nearly to zero. This is true

for both regulators 2 and 3. Regulator 1’s input supply

pin is also used to power the internal reference. When

any regulator; either 1, 2, or 3 is enabled, an additional

20µA for the reference will be drawn through V

IN1

. All

three must be disabled to enter the “zero” current-off-

mode-state. Forcing the enable pin high enables each

respective output voltage. This part is CMOS and none

of the enable pins can be left floating; a floating enable

pin may cause an indeterminate state on the output.

Input Capacitor

The MIC2215 is a high performance, high bandwidth

device. Therefore, it requires a well-bypassed input

supply for optimal performance. A small 0.1µF capacitor

placed close to the input is recommended to aid in noise

performance. Low-ESR ceramic capacitors provide opti-

mal performance at a mini-mum of space. Additional

high-frequency capacitors such as small valued NPO

dielectric type capacitors help to filter out high frequency

noise and are good practice in any RF-based circuit.

Output Capacitor

The MIC2215 requires an output capacitor for stability.

The design requires 1µF or greater on the output to

maintain stability. The design is optimized for use with

low-ESR ceramic chip capacitors. X7R/X5R dielectric-

type ceramic capacitors are recommended because of

their temperature performance. X7R-type capacitors

change capacitance by 15% over their operating temp-

erature 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 Pin

A capacitor can be placed from the noise bypass pin to

ground to reduce output voltage noise. The capacitor

bypasses the internal reference. There is one single

internal reference shared by each output, therefore the

bypassing affects each regulator. 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 capa citance.

Internal Reference

The internal band gap, or reference, is powered from the

IN1

input. Due to some of the input noise (PSRR)

contributions being imposed on the band gap, it is

important to make V

IN1

as clean as possible with good

bypassing close to the input.

Multiple Input Supplies

The MIC2215 can be used with multiple input supplies

when desired. The only requirement, aside from

maintaining the voltages within the operating ranges, is

that V

IN1

always remains the highest voltage potential.

No-Load Stability

The MIC2215 will remain stable and in regulation with no

load, unlike many other voltage regulators. This is

especially important in CMOS RAM keep-alive app-

lications.

Thermal Considerations

The MIC2215 is designed to provide up to 250mA of

current per channel 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 basic equation:

D(max)

= (T

J(max)

– T

)÷θ

J(max)

is the maximum junction temperature of the die,

125°C, and T

is the ambient operating temperature. θ

is layout dependent; Table 2 shows examples of the

junction-to-ambient thermal resistan ce for the MIC2215.

Package θ

Recommended

Minimum Footprint

16-Pin 4mm x 4mm MLF

43°C/W

Table 2. MLF

Thermal Resistance

The actual power dissipation of the regulator circuit can

be determined using the equation:

DTOTAL

= P

DLDO1

+ P

DLDO2

+ P

DLDO3

DLDO1

= (V

IN1

– V

OUT1

) × I

OUT1

DLDO2

= (V

IN2

– V

OUT2

) × I

OUT2

DLDO3

= (V

IN3

– V

OUT3

) × I

OUT3

Substituting P

D (max)

for P

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 MIC2215 at 60°C with

a minimum footprint layout, the maximum load currents

can be calculated as follows:

D (max)

= (125°C – 60°C)/43 °C/W

D (max)

= 1.511W

Micrel, Inc. MIC2215

January 2007

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The junction-to-ambient thermal resistance for the

minimum footprint is 43°C/W, from Table 2. The

maximum power dissipation must not be exceeded for

proper operation. Using a lithium-ion battery as the

supply voltage, 2.8V/250mA for channel 1, 3V/100mA for

channel 2 and 2.8V/50mA for channel 3, maximum

power can be calculated as follows:

DLDO1

= (V

IN1

– V

OUT1

) × I

OUT1

DLDO1

= (4.2V – 2.8V) × 250mA

DLDO1

= 350mW

DLDO2

= (V

IN2

– V

OUT2

) × I

OUT2

DLDO2

= (4.2V – 3.0V) × 100mA

DLDO2

= 120mW

DLDO3

= (V

IN3

– V

OUT3

) × I

OUT3

DLDO3

= (4.2V – 2.8V) × 50mA

DLDO3

= 70mW

DTOTAL

= P

DLDO1

+ P

DLDO2

+ P

DLDO3

DTOTAL

= 350mW + 120mW + 70mW

DTOTAL

= 540mW

The calculation shows that we are well below the

maximum allowable power dissipation of 1.511W for a

60°C ambient temperature. After the maximum power

dissipation has been calculated, it is always a good idea

to calculate the maximum ambient temperature for a

125°C junction temperature. Calculating maximum

ambient temperature as follows:

A(max)

= T

J(max)

– (P

x θ

)

A(max)

=125°C – (540mW x 43°C/W)

A(max)

= 101°C

For more information, please refer to the Designing with

Low-Dropout Voltage Regulators Handbook.

Adjustable Regulator Application

Adjustable regulators use the ratio of two resistors to

multiply the reference voltage to produce the desired

output voltage. The MIC2215 can be adjusted from

1.25V to (5.5V–max V

DROPOUT

) by using two external

resistors (Figure 1). The resistors set the output voltage

based on the following equation:

⎟

⎠

⎞

⎜

⎝

⎛+= R2

1VV

REFOUT

REF

= 1.25V

OUT1

ADJ1

MIC2215-AAA_M

Figure 1. Adjustable Ou t put

Micrel, Inc. MIC2215

January 2007

M9999-011207

Package Information

16-Pin (4mm x 4mm) MLF

(ML)

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.