Datasheet MIC5205 Datasheet (MICREL)

Page 1

MIC5205 Micrel

MIC5205

150mA Low-Noise LDO Regulator

General Description

The MIC5205 is an efficient linear voltage regulator with ultralow-noise output, very low dropout voltage (typically 17mV at light loads and 165mV at 150mA), and very low ground current (600µA at 100mA output). The MIC5205 offers better than 1% initial accuracy.

Designed especially for hand-held, battery-powered devices, the MIC5205 includes a CMOS or TTL compatible enable/ shutdown control input. When shutdown, power consumption drops nearly to zero. Regulator ground current increases only slightly in dropout, further prolonging battery life.

Key MIC5205 features include a reference bypass pin to improve its already excellent low-noise performance, reversed-battery protection, current limiting, and overtemperature shutdown.

The MIC5205 is available in fixed and adjustable output voltage versions in a small SOT-23-5 package.

For low-dropout regulators that are stable with ceramic output capacitors, see the µCap MIC5245/6/7 family.

Ordering Information

Part Number Marking Voltage Accuracy Junction Temp. Range* Package

MIC5205BM5 LBAA Adj 1% –40°C to +125°C SOT-23-5 MIC5205-2.5BM5 LB25 2.5V 1% –40°C to +125°C SOT-23-5 MIC5205-2.7BM5 LB27 2.7V 1% –40°C to +125°C SOT-23-5 MIC5205-2.8BM5 LB28 2.8V 1% –40°C to +125°C SOT-23-5 MIC5205-2.85BM5 LB2J 2.85V 1% –40°C to +125°C SOT-23-5 MIC5205-2.9BM5 LB29 2.9V 1% –40°C to +125°C SOT-23-5 MIC5205-3.0BM5 LB30 3.0V 1% –40°C to +125°C SOT-23-5 MIC5205-3.3BM5 LB33 3.3V 1% –40°C to +125°C SOT-23-5 MIC5205-3.6BM5 LB36 3.6V 1% –40°C to +125°C SOT-23-5 MIC5205-3.8BM5 LB38 3.8V 1% –40°C to +125°C SOT-23-5 MIC5205-4.0BM5 LB40 4.0V 1% –40°C to +125°C SOT-23-5 MIC5205-5.0BM5 LB50 5.0V 1% –40°C to +125°C SOT-23-5

Other voltages available. Contact Micrel for details.

Typical Application

MIC5205-x.xBM5

15 2

Enable

Shutdown

N (pin 3) may be

onnected directly

o IN (pin 1).

BYP

Features

• Ultra-low-noise output

• High output voltage accuracy

• Guaranteed 150mA output

• Low quiescent current

• Low dropout voltage

• Extremely tight load and line regulation

• Very low temperature coefficient

• Current and thermal limiting

• Reverse-battery protection

•“Zero” off-mode current

• Logic-controlled electronic enable

Applications

• Cellular telephones

• Laptop, notebook, and palmtop computers

• Battery-powered equipment

• PCMCIA VCC and V

• Consumer/personal electronics

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

• High-efficiency linear power supplies

OUT

= 2.2µF

OUT

tantalum

Low-Noise Operation:

= 470pF, C

BYP

Basic Operation:

= not used, C

BYP

regulation/switching

≥ 2.2µF

OUT

≥ 1µF

OUT

Ultra-Low-Noise Regulator Application

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

June 2000 1 MIC5205

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MIC5205 Micrel

Pin Configuration

LBxx

GND GND

LBAA

OUTBYP

Part Identification

OUTADJ

MIC5205-x.xBM5 MIC5205BM5

Fixed Voltages Adjustable Voltage

Pin Description

MIC5205-x.x MIC5205 Pin Name Pin Function

(fixed) (adjustable)

1 1 IN Supply Input 2 2 GND Ground 3 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable,

logic low or open = shutdown.

4 BYP Reference Bypass: Connect external 470pF capacitor to GND to reduce

output noise. May be left open.

4 ADJ Adjust (Input): Adjustable regulator feedback input. Connect to resistor

voltage divider.

5 5 OUT Regulator Output

Absolute Maximum Ratings (Note 1)

Supply Input Voltage (VIN) ............................ –20V to +20V

Enable Input Voltage (VEN) ........................... –20V to +20V

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

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

Operating Ratings (Note 2)

Input Voltage (VIN) ....................................... +2.5V to +16V

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

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

Thermal Resistance, SOT-23-5 (θJA).......................Note 3

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

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

MIC5205 2 June 2000

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MIC5205 Micrel

Electrical Characteristics

VIN = V

Symbol Parameter Conditions Min Typical Max Units

∆V

O/VO

∆V

O/VO

– V

GND

PSRR Ripple Rejection frequency = 100Hz, IL = 100µA75dB I

LIMIT

∆VO/∆P e

ENABLE Input

+ 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

OUT

Output Voltage Accuracy variation from specified V

OUT

–11% –22%

/∆T Output Voltage Note 4 40 ppm/°C

Temperature Coefficient Line Regulation VIN = V

+ 1V to 16V 0.004 0.012 % / V

OUT

0.05 % / V

Load Regulation IL = 0.1mA to 150mA, Note 5 0.02 0.2 %

0.5 %

Dropout Voltage, Note 6 IL = 100µA1050mV

70 mV

IL = 50mA 110 150 mV

230 mV

= 100mA 140 250 mV

300 mV

IL = 150mA 165 275 mV

350 mV

Quiescent Current VEN ≤ 0.4V (shutdown) 0.01 1 µA

VEN ≤ 0.18V (shutdown) 5 µA

Ground Pin Current, Note 7 VEN ≥ 2.0V, IL = 100µA80125µA

150 µA

IL = 50mA 350 600 µA

800 µA

IL = 100mA 600 1000 µA

1500 µA

= 150mA 1300 1900 µA

Current Limit V

Thermal Regulation Note 8 0.05 %/W

= 0V 320 500 mA

OUT

Output Noise IL = 50mA, CL = 2.2µF, 260

2500 µA

nV/ Hz

470pF from BYP to GND

Enable Input Logic-Low Voltage regulator shutdown 0.4 V

0.18 V Enable Input Logic-High Voltage regulator enabled 2.0 V Enable Input Current VIL ≤ 0.4V 0.01 –1 µA

≤ 0.18V –2 µA

VIH ≥ 2.0V 2 5 20 µA VIH ≥ 2.0V 25 µA

Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is P

allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJA of the MIC5205xxBM5 (all versions) is 220°C/W mounted on a PC board (see “Thermal Considerations” section for further details).

Note 4: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load

range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.

Note 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.

Note 7: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of

the load current plus the ground pin current.

Note 8: Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line

regulation effects. Specifications are for a 150mA load pulse at VIN = 16V for t = 10ms.

D(max)

= (T

– TA) ÷ θJA. Exceeding the maximum

J(max)

June 2000 3 MIC5205

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MIC5205 Micrel

Typical Characteristics

Power Supply

Rejection Ratio

-20

VIN = 6V V

= 5V

OUT

-40

-60

PSRR (dB)

-80

-100

1E+11E+21E+31E+41E+51E+61E+7

100

FREQUENCY (Hz)

= 100µA

OUT

= 1µF

OUT

10k

100k

Power Supply

Rejection Ratio

-20

-40

-60

PSRR (dB)

-80

-100

1E+11E+21E+31E+41E+51E+61E+7

100

FREQUENCY (Hz)

10k

VIN = 6V V

OUT

100k

= 5V

OUT

= 1mA

= 1µF

10M

Power Supply

Rejection Ratio

VIN = 6V V

OUT

= 5V

-20

-40

-60

PSRR (dB)

-80

-100

1E+11E+21E+31E+41E+51E+61E+7

100

= 100µA

OUT

= 2.2µF

OUT

= 0.01µF

BYP

10k

FREQUENCY (Hz)

100k

Power Supply

Rejection Ratio

VIN = 6V V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

= 1mA

OUT

= 2.2µF

OUT

= 0.01µF

BYP

1E+11E+21E+31E+41E+51E+61E+7

100

10k

FREQUENCY (Hz)

100k

10M

Power Supply Ripple Rejection

vs. Voltage Drop

1mA

10mA

OUT

= 100mA

RIPPLE REJECTION (dB)

0 0.1 0.2 0.3 0.4

VOLTAGE DROP (V)

OUT

= 1µF

Power Supply Ripple Rejection

100

RIPPLE REJECTION (dB)

vs. Voltage Drop

90 80

1mA 70 60 50 40

10mA 30 20 10

0 0.1 0.2 0.3 0.4

VOLTAGE DROP (V)

OUT

BYP

= 100mA

OUT

= 2.2µF

= 0.01µF

Power Supply

Rejection Ratio

VIN = 6V V

OUT

= 5V

-20

-40

-60

PSRR (dB)

-80

-100

1E+11E+21E+31E+41E+51E+61E+7

100

FREQUENCY (Hz)

= 10mA

OUT

= 1µF

OUT

10k

100k

Power Supply

Rejection Ratio

VIN = 6V V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

= 100mA

OUT

= 1µF

OUT

1E+11E+21E+31E+41E+51E+6 1E+7

100

10k

FREQUENCY (Hz)

100k

10M

Power Supply

Rejection Ratio

VIN = 6V V

OUT

= 5V

-20

-40

-60

PSRR (dB)

-80

-100

1E+11E+21E+31E+41E+51E+61E+7

100

FREQUENCY (Hz)

= 10mA

OUT

= 2.2µF

OUT

= 0.01µF

BYP

10k

100k

Power Supply

Rejection Ratio

VIN = 6V V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

= 100mA

OUT

= 2.2µF

OUT

= 0.01µF

BYP

1E+11E+21E+31E+41E+51E+6 1E+7

100

10k

FREQUENCY (Hz)

100k

10M

Turn-On Time

vs. Bypass Capacitance

10000

1000

TIME (µs)

100

10 100 1000 10000

CAPACITANCE (pF)

Dropout Voltage

vs. Output Current

320 280 240 200 160 120

80 40

DROPOUT VOLTAGE (mV)

0 40 80 120 160

+125°C

+25°C

OUTPUT CURRENT (mA)

–40°C

MIC5205 4 June 2000

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MIC5205 Micrel

0.0001

0.001

0.01

0.1

1E+11E+21E+31E+41E+51E+6 1E+7

NOISE (µV/√Hz)

FREQUENCY (Hz)

√

0.0001

0.001

0.01

0.1

1E+11E+21E+31E+41E+51E+6 1E+7

NOISE (µV/√Hz)

FREQUENCY (Hz)

√

Typical Characteristics

Noise Performance

10mA, C

0.1

1mA

= 1µF

OUT

BYP

= 10nF

NOISE (µV/√Hz)

0.01

0.001 V

0.0001

1E+11E+21E+31E+41E+51E+61E+7

100

10k 100k 1M 10M

FREQUENCY (Hz)

Noise Performance

Hz)

0.1

0.01

= 5V

NOISE (µV/

0.0001

OUT

= 10µF

OUT

0.001

electrolytic C

= 100pF

BYP

1E+11E+21E+31E+41E+51E+6 1E+7

100

FREQUENCY (Hz)

1mA

10mA

10k 100k1M10M

OUT

= 1µF

= 5V

100mA

Noise Performance

= 5V

OUT

= 10µF

OUT

electrolytic

100

Noise Performance

= 5V

OUT

= 10µF

OUT

electrolytic C

= 1nF

BYP

100

100mA

10mA

1mA

10k 100k1M10M

10mA

100mA

1mA

10k 100k1M10M

Noise Performance

Hz)

0.1

0.01

NOISE (µV/

0.001

0.0001

1E+11E+21E+31E+41E+51E+6 1E+7

Hz)

0.1

0.01

NOISE (µV/

0.001

0.0001

1E+11E+21E+31E+41E+51E+6 1E+7

100mA

= 5V

OUT

= 22µF

OUT

tantalum C

= 10nF

BYP

100

10k 100k1M10M

FREQUENCY (Hz)

Noise Performance

= 5V

OUT

= 10µF

OUT

electrolytic C

= 10nF

BYP

FREQUENCY (Hz)

1mA

1k100

10k

1mA

100mA

10mA

100k

10mA

10M

June 2000 5 MIC5205

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MIC5205 Micrel

Block Diagrams

BYP

(optional)

BYP

MIC5205-x.xBM5

Ultra-Low-Noise Fixed Regulator

Current Limit

Thermal Shutdown

Bandgap

Ref.

REF

GND

OUT

ADJ

OUT

Bandgap

Ref.

REF

Current Limit

Thermal Shutdown

MIC5205BM5

GND

Ultra-Low-Noise Adjustable Regulator

BYP

(optional)

= V

OUT

(1 + R2/R1)

REF

MIC5205 6 June 2000

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MIC5205 Micrel

P =

T – T

(max)

J(max) A

()

Applications Information

Enable/Shutdown

Forcing EN (enable/shutdown) high (> 2V) enables the regulator. EN is compatible with CMOS logic gates.

If the enable/shutdown feature is not required, connect EN (pin 3) to IN (supply input, pin 1). See Figure 1.

Input Capacitor

A 1µF capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input.

Reference Bypass Capacitor

BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (C GND quiets this reference, providing a significant reduction in output noise. C when using C

reduces the regulator phase margin;

BYP

, output capacitors of 2.2µF or greater are

BYP

generally required to maintain stability. The start-up speed of the MIC5205 is inversely proportional

to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of C consider omitting C

. Likewise, if rapid turn-on is necessary,

BYP

If output noise is not a major concern, omit C BYP open.

Output Capacitor

An output capacitor is required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0µF minimum is recommended when C used (see Figure 2). 2.2µF minimum is recommended when C

is 470pF (see Figure 1). Larger values improve the

BYP

regulator’s transient response. The output capacitor value may be increased without limit.

The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at about –30°C, solid tantalums are recommended for operation below –25°C.

At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to

0.47µF for current below 10mA or 0.33µF for currents below 1mA.

No-Load Stability

The MIC5205 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications.

) connected from BYP to

BYP

and leave

BYP

is not

Thermal Considerations

The MIC5205 is designed to provide 150mA of continuous current 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:

is the maximum junction temperature of the die,

J(max)

125°C, and TA is the ambient operating temperature. θJA is layout dependent; Table 1 shows examples of junction-toambient thermal resistance for the MIC5205.

Package

SOT-23-5 (M5) 220°C/W 170°C/W 130°C/W

θθ

θJA Recommended

θθ

Minimum Footprint Copper Clad

θθ

θJA 1" Square

θθ

Table 1. SOT-23-5 Thermal Resistance

The actual power dissipation of the regulator circuit can be determined using the equation:

= (VIN – V

Substituting P

D(max)

) I

OUT

+ VIN I

GND

OUT

for PD 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 MIC5205-3.3BM5 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows:

°°

125 C – 25 C

P =

D(max)

()

°220

C/W

= 455mW

The junction-to-ambient thermal resistance for the minimum footprint is 220°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximum input voltage can be determined. From the Electrical Characteristics table, the maximum ground current for 150mA output current is 2500µA or 2.5mA.

455mW = (VIN – 3.3V) 150mA + VIN·2.5mA 455mW = VIN·150mA – 495mW + VIN·2.5mA 950mW = VIN·152.5mA V

IN(max)

= 6.23V

Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.2V in a SOT-23-5 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the Regulator Thermals section of Micrel’s

lators

handbook.

Designing with Low-Dropout Voltage Regu-

June 2000 7 MIC5205

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MIC5205 Micrel

Fixed Regulator Applications

MIC5205-x.xBM5

15 2 3

OUT

2.2µF

470pF

Figure 1. Ultra-Low-Noise Fixed Voltage Application

Figure 1 includes a 470pF capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an application where enable/shutdown is not required. C

OUT

= 2.2µF

minimum.

Enable

Shutdown

MIC5205-x.xBM5

15 2 34

OUT

1.0µF

Figure 2. Low-Noise Fixed Voltage Application

Figure 2 is an example of a low-noise configuration where C

is not required. C

BYP

= 1µF minimum.

OUT

Adjustable Regulator Applications

The MIC5205BM5 can be adjusted to a specific output voltage by using two external resistors (Figure 3). The resistors set the output voltage based on the following equation:

V = 1.242V

OUT

 



+ 1

 



This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to ground and have a different V

equation.

OUT

Resistor values are not critical because ADJ (adjust) has a high input impedance, but for best results use resistors of 470kΩ or less. A capacitor from ADJ to ground provides greatly improved noise performance.

MIC5205BM5

15 2 3

470pF

OUT

2.2µF

Figure 3. Ultra-Low-Noise

Adjustable Voltage Application

Figure 3 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise.

Dual-Supply Operation

When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground.

MIC5205 8 June 2000

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MIC5205 Micrel

Package Information

1.90 (0.075) REF

0.95 (0.037) REF

3.02 (0.119)

2.80 (0.110)

0.50 (0.020)

0.35 (0.014)

1.75 (0.069)

1.50 (0.059)

1.30 (0.051)

0.90 (0.035)

0.15 (0.006)

0.00 (0.000)

SOT-23-5 (M5)

3.00 (0.118)

2.60 (0.102)

10°

0°

DIMENSIONS:

MM (INCH)

0.20 (0.008)

0.09 (0.004)

0.60 (0.024)

0.10 (0.004)

June 2000 9 MIC5205

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MIC5205 Micrel

MIC5205 10 June 2000

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MIC5205 Micrel

June 2000 11 MIC5205

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MIC5205 Micrel

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

MIC5205 12 June 2000