Datasheet MIC5210 Datasheet (MICREL)

MIC5210 Micrel

MIC5210

Dual 150mA LDO Regulator

Preliminary Information

General Description

The MIC5210 is a dual linear voltage regulator with very low
dropout voltage (typically 10mV at light loads and 140mV at
100mA), very low ground current (225µA at 10mA output), and
better than 1% initial accuracy. It also features individual logic­compatible enable/shutdown control inputs.

Both regulator outputs can supply up to 150mA at the same
time as long as each regulator’s maximum junction tempera­ture is not exceeded.

Designed especially for hand-held battery powered devices,
the MIC5210 can be switched by a CMOS or TTL compatible
logic signal, or the enable pin can be connected to the supply
input for 3-terminal operation. When disabled, power con­sumption drops nearly to zero. Dropout ground current is
minimized to prolong battery life.

Key features include current limiting, overtemperature shut­down, and protection against reversed battery.

The MIC5210 is available in 2.7V, 2.8V, 3.0V, 3.3V, 3.6V, 4.0V
and 5.0V fixed voltage configurations. Other voltages are
available; contact Micrel for details.

Ordering Information

Features

• Micrel Mini 8™ MSOP package

• Up to 150mA per regulator output

• Low quiescent current

• Low dropout voltage

• Wide selection of output voltages

• Tight load and line regulation

• Low temperature coefficient

• Current and thermal limiting

• Reversed input polarity protection

• Zero off-mode current

• Logic-controlled electronic enable

Applications

• Cellular telephones

• Laptop, notebook, and palmtop computers

• Battery powered equipment

• Bar code scanners

• SMPS post regulator/dc-to-dc modules

• High-efficiency linear power supplies

Typical Application

Output A

Output B

tantalum

2.2µF

tantalum

Part Number Voltage Accuracy Junction Temp. Range* Package

MIC5210-2.7BMM 2.7 1.0% –40°C to +125°C 8-lead MSOP
MIC5210-2.8BMM 2.8 1.0% –40°C to +125°C 8-lead MSOP
MIC5210-3.0BMM 3.0 1.0% –40°C to +125°C 8-lead MSOP
MIC5210-3.3BMM 3.3 1.0% –40°C to +125°C 8-lead MSOP
MIC5210-3.6BMM 3.6 1.0% –40°C to +125°C 8-lead MSOP
MIC5210-4.0BMM 4.0 1.0% –40°C to +125°C 8-lead MSOP
MIC5210-5.0BMM 5.0 1.0% –40°C to +125°C 8-lead MSOP

Other voltages available. Contact Micrel for details.

1µF

1
2
3
4

C

BYP

470pF

MIC5210

Enable may be connected to V

8

Enable A

7
6

Enable B

5

IN

1µF

Low-Noise + Ultralow-Noise (Dual) Regulator

MM8 and Micrel Mini 8 are trademarks of Micrel, Inc.

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

February 2000 1 MIC5210

MIC5210 Micrel

Pin Configuration

OUTA

GND

OUTB

BYPB

Pin Description

Pin Number Pin Name Pin Function

1 OUTA Regulator Output A
2 GND Ground.
3 OUTB Regulator Output B
4 BYPB Reference Bypass B: Connect external 470pF capacitor to GND to reduce

5 ENB Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,

6 INB Supply Input B
7 ENA Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,

8 INA Supply Input A

1
2
3
4

8

INA

7

ENA

6

INB
ENB

5

MIC5210BMM

output noise in regulator “B”. May be left open.

logic low or open = shutdown. Do not leave floating.

logic low or open = shutdown. Do not leave floating.

Absolute Maximum Ratings

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

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

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

Storage Temperature Range ................... –60°C to +150°C

Recommended Operating Conditions

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

Enable Input Voltage (VEN) ................................. 0V to 16V

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

Thermal Resistance (θJA)......................................... Note 1

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

MIC5210 2 February 2000

MIC5210 Micrel

Electrical Characteristics

VIN = V

Symbol Parameter Conditions Min Typical Max Units

V

O

∆V

O

∆V

O/VO

∆V

O/VO

V

– V

IN

I

GND

I

GND

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

LIMIT

∆VO/∆P
e

no

ENABLE Input

V

IL

V

IH

I

IL

I

IH

+ 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%
–2 2 %

/∆T Output Voltage Note 2 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 3) 0.02 0.2 %

0.5 %

O

Dropout Voltage, Note 4 IL = 100µA1050mV

70 mV

IL = 50mA 110 150 mV

230 mV

= 100mA 140 250 mV

I

L

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 5 VEN ≥ 2.0V, IL = 100µA80125µA
(per regulator) 150 µA

IL = 50mA 350 600 µA

800 µA

IL = 100mA 600 1000 µA

1500 µA

= 150mA 1300 1900 µA

I

L

Current Limit V

D

Thermal Regulation Note 6 0.05 %/W

= 0V 320 500 mA

OUT

Output Noise (Regulator B only) IL = 50mA, CL = 2.2µF, 260

2500 µA

nV/ Hz

470pF from BYPB 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

V

≤ 0.18V –2 µA

IL

VIH ≥ 2.0V 5 20 µA
VIH ≥ 2.0V 25 µA

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when

Note 2: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 3: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load

Note 4: 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 5: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of

Note 6: 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

operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction
temperature, T
dissipation at any ambient temperature is calculated using: P
tion will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJA of the 8-lead MSOP (MM) is 200°C/W
mounted on a PC board (see “Thermal Considerations” section for further details).

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

differential.

the load current plus the ground pin current.

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

, the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power

J(max)

D(max)

= (T

– TA) ÷ θJA. Exceeding the maximum allowable power dissipa-

J(max)

February 2000 3 MIC5210

MIC5210 Micrel

Typical Characteristics

Power Supply

Rejection Ratio

0

-20

VIN = 6V
V

= 5V

OUT

-40

-60

PSRR (dB)

-80

-100

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

10

100

FREQUENCY (Hz)

I

= 100µA

OUT

C

= 1µF

OUT

1k

10k

100k

1M

Power Supply

Rejection Ratio

0

VIN = 6V
V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

I

= 100mA

OUT

C

= 1µF

OUT

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

10

1k

100

10k

FREQUENCY (Hz)

100k

1M

10M

10M

Power Supply

Rejection Ratio

0

-20

VIN = 6V
V

= 5V

OUT

-40

-60

PSRR (dB)

-80

-100

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

10

100

FREQUENCY (Hz)

I

= 1mA

OUT

C

= 1µF

OUT

1k

10k

100k

1M

Power Supply

Rejection Ratio

0

VIN = 6V
V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

I

= 100µA

OUT

C

= 2.2µF

OUT

C

= 0.01µF

BYP

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

10

1k

100

10k

FREQUENCY (Hz)

100k

1M

10M

10M

Power Supply

Rejection Ratio

0

VIN = 6V
V

OUT

= 5V

-20

-40

-60

PSRR (dB)

-80

-100

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

10

100

FREQUENCY (Hz)

I

= 10mA

OUT

C

= 1µF

OUT

1k

10k

100k

1M

Power Supply

Rejection Ratio

0

VIN = 6V
V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

I

= 1mA

OUT

C

= 2.2µF

OUT

C

= 0.01µF

BYP

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

10

1k

100

10k

FREQUENCY (Hz)

100k

1M

10M

10M

Power Supply

Rejection Ratio

0

VIN = 6V
V

OUT

= 5V

-20

-40

-60

PSRR (dB)

-80

-100

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

10

100

FREQUENCY (Hz)

I

= 10mA

OUT

C

= 2.2µF

OUT

C

= 0.01µF

BYP

1k

10k

100k

1M

Power Supply Ripple Rejection

100

RIPPLE REJECTION (dB)

vs. Voltage Drop

90
80

1mA
70
60
50
40

10mA
30
20
10

0

0 0.1 0.2 0.3 0.4

VOLTAGE DROP (V)

I

C
C

OUT

OUT
BYP

= 100mA

= 2.2µF
= 0.01µF

10M

Turn-On Time

vs. Bypass Capacitance

10000

1000

TIME (µs)

100

10

10 100 1000 10000

CAPACITANCE (pF)

Power Supply

Rejection Ratio

0

VIN = 6V
V

-20

-40

-60

PSRR (dB)

-80

-100

= 5V

OUT

I

= 100mA

OUT

C

= 2.2µF

OUT

C

= 0.01µF

BYP

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

10

1k

100

10k

FREQUENCY (Hz)

100k

1M

10M

Power Supply Ripple Rejection

vs. Voltage Drop

60

50

1mA

40

30

20

10

RIPPLE REJECTION (dB)

0.01

NOISE (µV/√Hz)

0.001

0.0001

10mA

I

= 100mA

OUT

C

= 1µF

OUT

0

0 0.1 0.2 0.3 0.4

VOLTAGE DROP (V)

Noise Performance

10

10mA, C

1

0.1

1mA

C

= 1µF

OUT

C

= 10nF

BYP

(Reg. B only)

10

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

1k

100

FREQUENCY (Hz)

OUT

V

OUT

10k 100k 1M 10M

= 1µF

= 5V

MIC5210 4 February 2000

MIC5210 Micrel

√

0.0001

0.001

0.01

0.1

1

10

1E+11E+21E+31E+4 1E+5 1E+6 1E+7

NOISE (µV/√Hz)

FREQUENCY (Hz)

√
√

0.0001

0.001

0.01

0.1

1

10

1E+11E+21E+31E+4 1E+5 1E+6 1E+7

NOISE (µV/√Hz)

FREQUENCY (Hz)

Noise Performance

10

1

Hz)

0.1

0.01

NOISE (µV/

V

= 5V

OUT

0.001

C

= 10µF

OUT

electrolytic

0.0001
10

1E+11E+21E+31E+4 1E+5 1E+6 1E+7

1k

100

FREQUENCY (Hz)

100mA

1mA

10k 100k1M10M

Noise Performance

V

OUT

C

OUT

electrolytic
C

BYP

10

100

(Regulator B)

= 5V
= 10µF

= 1nF

FREQUENCY (Hz)

1mA

1k

10k 100k1M10M

10

1

Hz)

0.1

0.01

NOISE (µV/

0.001

0.0001

1E+11E+21E+31E+4 1E+5 1E+6 1E+7

10mA

10mA

100mA

Noise Performance

(Regulator B)

100mA

V

= 5V

OUT

C

= 22µF

OUT

tantalum
C

= 10nF

BYP

100

1k

10

Noise Performance

(Regulator B)

V

= 5V

OUT

C

= 10µF

OUT

electrolytic
C

= 10nF

BYP

10

1k100

10mA

1mA

10k 100k1M10M

100mA

1mA

10mA

10k

100k

1M

10M

Noise Performance

V

= 5V

OUT

C

= 10µF

OUT

electrolytic
C

= 100pF

BYP

10

100

FREQUENCY (Hz)

(Regulator B)

1mA

10mA

1k

10k 100k1M10M

10

1

Hz)

0.1

0.01

NOISE (µV/

0.001

0.0001

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

Dropout Voltage

vs. Output Current

320
280
240
200
160
120

80
40

DROPOUT VOLTAGE (mV)

0

0 40 80 120 160

+125°C

+25°C

OUTPUT CURRENT (mA)

100mA

–40°C

February 2000 5 MIC5210

MIC5210 Micrel

Block Diagram

INA

ENA

INB

ENB

Current Limit

Thermal Shutdown

Current Limit

Thermal Shutdown

Bandgap

Ref.

V

REF

Bandgap

Ref.

V

REF

OUTA

OUTB

BYPB

C

BYP

GND

MIC5210 6 February 2000

MIC5210 Micrel

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 to
IN (supply input).

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

BYPB (reference bypass) is connected to the internal voltage
reference of regulator B. A 470pF capacitor (C
from BYPB to GND quiets this reference, providing a signifi­cant reduction in output noise. C
phase margin; when using C

BYP

reduces the regulator

BYP

, output capacitors of 2.2µF or

greater are generally required to maintain stability.
The start-up speed of the MIC5210 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

.

BYP

If output noise is not a major concern, omit C
BYPB 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. Ultralow-ESR capacitors may cause a low­amplitude oscillation and/or underdamped transient response.
Most tantalum or aluminum electrolytic capacitors are ad­equate; film types will work, but are more expensive. Since
many aluminum electrolytic capacitors have electrolytes that
freeze at about –30°C, solid tantalum capacitors 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 MIC5210 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

BYP

and leave

BYP

BYP

is not

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.

Thermal Considerations

Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.

The MIC5210-xxBMM (8-lead MSOP) has a thermal resis­tance of 200°C/W when mounted on a FR4 board with
minimum trace widths and no ground plane.

PC Board
Dielectric

FR4 200°C/W

θθ

θ

θθ

JA

MSOP Thermal Characteristics

For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.

Thermal Evaluation Examples

For example, at 50°C ambient temperature, the maximum
package power dissipation is:

P

P

= (125°C – 50°C) ÷ 200°C/W

D(max)

= 375mW

D(max)

If the intent is to operate the 5V version from a 6V supply at the
full 150mA load for both outputs in a 50°C maximum ambient
temperature, make the following calculation:

P

D(each regulator)

P

D(each regulator)

P

D(each regulator)

P

D(both regulators)

P

D(both regulators)

= (VIN – V

OUT

) × I

+ (VIN × I

OUT

GND

= (6V – 5V) × 150mA + (6V × 2.5mA)
= 165mW

= 2 regulators × 165mW
= 330mW

)

The actual total power dissipation of 330mW is below the
375mW package maximum, therefore, the regulator can be
used.

Note that both regulators cannot always be used at their
maximum current rating. For example, in a 5V input to 3.3V
output application at 50°C, if one regulator supplies 150mA,
the other regulator is limited to a much lower current. The first
regulator dissipates:

PD = (5V – 3.3V) 150 + 2.5mA (5V)
PD = 267.5mW

Then, the load that the remaining regulator can dissipate must
not exceed:

375mW – 267.5mW = 107.5mW

This means, using the same 5V input and 3.3V output voltage,
the second regulator is limited to about 60mA.

Taking advantage of the extremely low-dropout voltage char­acteristics of the MIC5210, power dissipation can be reduced
by using the lowest possible input voltage to minimized the
input-to-output voltage drop.

February 2000 7 MIC5210

MIC5210 Micrel

Package Information

0.122 (3.10)

0.112 (2.84)

0.036 (0.90)

0.032 (0.81)

0.012 (0.03)

0.0256 (0.65) TYP

0.199 (5.05)

0.187 (4.74)

0.120 (3.05)

0.116 (2.95)

0.043 (1.09)

0.038 (0.97)

0.008 (0.20)

0.004 (0.10)

8-Pin MSOP (MM)

0.012 (0.30) R

5° MAX

0° MIN

DIMENSIONS:

INCH (MM)

0.007 (0.18)

0.005 (0.13)

0.012 (0.03) R

0.039 (0.99)

0.035 (0.89)

0.021 (0.53)

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

TEL + 1 [phone] FAX + 1 [phone] 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.

© 2000 Micrel Incorporated

MIC5210 8 February 2000