MICREL MIC5250-3.0BMM, MIC5250-3.3BMM, MIC5250-2.7BMM, MIC5250-2.8BMM Datasheet

MIC5250 Micrel

MIC5250

Dual 150mA µCap CMOS LDO Regulator

Preliminary Information

General Description

The MIC5250 is an efficient, precise dual CMOS voltage
regulator optimized for ultra-low-noise applications. The
MIC5250 offers better than 1% initial accuracy, extremely low
dropout voltage (typically 150mV at 150mA) and constant
ground current over load (typically 100µA). The MIC5250
provides a very-low-noise output, ideal for RF applications
where quiet voltage sources are required. A noise bypass pin
is also available for further reduction of output noise.

Designed specifically for hand-held and battery-powered
devices, the MIC5250 provides TTL logic compatible enable
pins. When disabled, power consumption drops nearly to
zero.

The MIC5250 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.

Key features include current limit, thermal shutdown, push­pull outputs for faster transient response, and active clamps
to speed up device turnoff. Available in the 10-lead MSOP
(micro-shrink-outline package), the MIC5250 also offers a
range of fixed output voltages.

Features

• Ultralow dropout—100mV @ 100mA

• Ultralow noise—30µV(rms)

• Stability with ceramic, tantalum, or aluminum electrolytic
capacitors

• Load independent, ultralow ground current

• 150mA output current

• Current limiting

• Thermal Shutdown

• Tight load and line regulation

• “Zero” off-mode current

• Fast transient response

• TTL-Logic-controlled enable input

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• PCMCIA VCC and VPP regulation/switching

• Consumer/personal electronics

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

• High-efficiency linear power supplies

Typical Application

Ordering Information

Part Number Voltage Junction Temp. Range Package

MIC5250-2.7BMM 2.7V –40°C to +125°C 10-lead MSOP
MIC5250-2.8BMM 2.8V –40°C to +125°C 10-lead MSOP
MIC5250-3.0BMM 3.0V –40°C to +125°C 10-lead MSOP
MIC5250-3.3BMM 3.3V –40°C to +125°C 10-lead MSOP

Other voltages available. Contact Micrel for details.

MIC5250-3.3BMM

9

V

ENABLE

SHUTDOWN

ENABLE

SHUTDOWN

ENA may be connected directly to INA.
ENB may be connected directly to INB.
GNDA and GND B may be connected to

isolated grounds or the same ground.

INA

V

INB

INA

2

ENA

7

INB

5

ENB

OUTA

BYPA

GNDA

OUTB

BYPB

GNDB

10

1

C

3

8
4
6

BYPA

(optional)

C

BYPB

(optional)

C

C

3.3V

OUTA

3.3V

OUTB

Dual Ultra-Low-Noise Regulator Circuit

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com

March 2000 1 MIC5250

MIC5250 Micrel

Pin Configuration

ENA

GNDA

BYPB

ENB

Pin Description

Pin Number Pin Name Pin Function

9 / 7 INA / B Supply Input*
3 / 6 GNDA / B Ground*
2 / 4 ENA / B Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;

1 / 4 BYPA / B Reference Bypass: Connect external 0.01µF capacitor to GND to reduce

10 / 8 OUTA / B Regulator Output

* Supply inputs and grounds are fully isolated.

1BYPA
2
3
4
5

10 OUTA

INA

9

OUTB

8

INB

7

GNDB

6

MIC5250-x.xBMM

logic low = shutdown. Do not leave open.

output noise. May be left open.

Absolute Maximum Ratings (Note 1)

Supply Input Voltage (VIN) .................................. 0V to +7V

Enable Input Voltage (VEN) ................................. 0V to +7V

Junction Temperature (TJ) ...................................... +150°C

Storage Temperature ............................... –65°C to +150°C

Operating Ratings (Note 2)

Input Voltage (VIN) ......................................... +2.7V to +6V

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

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

Thermal Resistance (θJA)......................................200°C/W

IN

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

ESD, Note 3

MIC5250 2 March 2000

MIC5250 Micrel

Electrical Characteristics

Each regulator: VIN = V

Symbol Parameter Conditions Min Typical Max Units

V

O

∆V

LNR

∆V

LDR

VIN – V

I

Q

I

GND

OUT

Output Voltage Accuracy I

Line Regulation VIN = V
Load Regulation I
Dropout Voltage, Note 5 I

Quiescent Current VEN ≤ 0.4V (shutdown) 0.2 1 µA
Ground Pin Current, Note 6 I

PSRR Power Supply Rejection f = 120Hz, C
I
e

LIM

n

Current Limit V
Output Voltage Noise C

Enable Input

V

IL

V

IH

I

EN

Enable Input Logic-Low Voltage VIN = 2.7V to 5.5V, regulator shutdown 0.8 0.4 V
Enable Input Logic-High Voltage VIN = 2.7V to 5.5V, regulator enabled 2.0 1V
Enable Input Current VIL ≤ 0.4V 0.17 µA

Shutdown Resistance Discharge 500 Ω

Thermal Protection

Thermal Shutdown Temperature 150 °C
Thermal Shutdown Hysteresis 10 °C

+ 1V, VEN = V

OUT

= 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

IN; IOUT

= 0mA –11%

OUT

–2 2 %

+ 0.1V to 6V –0.3 0 0.3 %/V

OUT

= 0.1mA to 150mA, Note 4 2.0 3.0 %

OUT

= 100µA 1.5 5 mV

OUT

I

= 50mA 50 85 mV

OUT

I

= 100mA 100 150 mV

OUT

I

= 150mA 150 200 mV

OUT

= 0mA 100 150 µA

OUT

I

= 150mA 100 µA

OUT

= 10µF, C

OUT

= 0V 160 300 mA

OUT

= 10µF, C

OUT

f = 10Hz to 100kHz

= 0.01µF, 30

BYP

= 0.01µF50dB

BYP

VIH ≥ 2.0V 1.5 µA

250 mV

µV(rms)

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. Devices are ESD sensitive. Handling precautions recommended.
Note 4. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load

Note 5. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V

Note 6. 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

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

differential.

pin current.

March 2000 3 MIC5250

MIC5250 Micrel

Typical Characteristics

Power Supply

100

80

60

40

PSRR (dB)

20

Rejection Ratio

10k

VIN = 4V
V

OUT

100k

= 3V

1M

I

= 100µA

OUT

C

= 1µF tant

OUT

0

1E+11E+21E+31E+41E+5 1E+6 1E+7

10

1k

100

FREQUENCY (Hz)

Power Supply

100

80

60

40

PSRR (dB)

20

Rejection Ratio

10k

VIN = 4V
V

OUT

100k

= 3V

1M

I

= 150mA

OUT

C

= 1µF tant

OUT

0

1E+11E+21E+31E+41E+5 1E+6 1E+7

10

1k

100

FREQUENCY (Hz)

10M

10M

Power Supply

100

80

60

40

PSRR (dB)

20

Rejection Ratio

I

= 10mA

OUT

C

= 1µF tant

OUT

0

1E+11E+21E+31E+41E+5 1E+6 1E+7

10

1k

100

FREQUENCY (Hz)

10k

VIN = 4V
V

OUT

100k

= 3V

1M

Power Supply

100

PSRR (dB)

Rejection Ratio

80

60

40

I

= 100µA

20

VIN = 4V
V

OUT

0

1E+11E+21E+31E+41E+5 1E+6 1E+7

100 1k 10k 100k 1M 10M

10

OUT

C

= 10µF cer.

OUT

= 3V

C

= 0.01µF

BYP

FREQUENCY (Hz)

10M

Power Supply

100

80

60

40

PSRR (dB)

20

Rejection Ratio

I

= 100mA

OUT

C

= 1µF tant

OUT

0

1E+11E+21E+31E+41E+5 1E+61E+7

10

1k

100

FREQUENCY (Hz)

10k

VIN = 4V
V

OUT

100k

= 3V

1M

Power Supply

100

80

60

40

PSRR (dB)

20

Rejection Ratio

VIN = 4V
V

= 3V

OUT

I

= 10mA

OUT

C

= 10µF cer.

OUT

C

= 0.01µF

0

1E+11E+21E+31E+41E+5 1E+61E+7

100 1k 10k 100k 1M 10M

10

BYP

FREQUENCY (Hz)

10M

Power Supply

100

80

60

40

PSRR (dB)

20

Rejection Ratio

VIN = 4V
V

= 3V

OUT

I

= 100mA

OUT

C

= 10µF cer.

OUT

C

= 0.01µF

0

1E+11E+21E+31E+41E+5 1E+6 1E+7

100 1k 10k 100k 1M 10M

10

BYP

FREQUENCY (Hz)

Power Supply Ripple Rejection

vs. Voltage Drop

80
70
60
50
40
30
20

RIPPLE REJECTION (dB)

10

0

0 200 400 600 800 1000

I

= 100mA

OUT

100mA

10mA

C
C

VOLTAGE DROP (mV)

100µA

= 10µF cer.

OUT

= 0.01µF

BYP

Power Supply

100

80

60

40

PSRR (dB)

20

NOISE (µV/√Hz)

Rejection Ratio

VIN = 4V
V

= 3V

OUT

I

= 150mA

OUT

C

= 10µF cer.

OUT

C

= 0.01

BYP

0

1E+11E+21E+31E+41E+5 1E+61E+7

100 1k 10k 100k 1M 10M

10

FREQUENCY (Hz)

Noise Performance

10

IL = 100µA

1

VIN = 4V

0.1

V

= 3V

OUT

C

= 1µF cer.

OUT

C

= 0.01µF

BYP

0.01
10 100 1k 10k 100k 1M

1E+1 1E+2 1E+3 1E+4 1E+5 1E+6

FREQUENCY (Hz)

Power Supply Ripple Rejection

vs. Voltage Drop

80
70
60
50
40
30
20

RIPPLE REJECTION (dB)

10

0

0 200 400 600 800 1000

10

1

VIN = 4V

0.1

V

NOISE (µV/√Hz)

0.01
10

1E+1 1E+2 1E+3 1E+4 1E+5 1E+6

10mA100µA

I

= 100mA

OUT

C

VOLTAGE DROP (mV)

Noise Performance

= 3V

OUT

C

= 10µF cer.

OUT

C

= 0.01µF

BYP

1k

100

FREQUENCY (Hz)

10k

150mA

= 1µF

OUT

IL = 100µA

100k

1M

MIC5250 4 March 2000