Datasheet MIC29502BT, MIC29502BU, MIC29503BT, MIC29503BU, MIC29501-5.0BU Datasheet (MICREL)

MIC29150/29300/29500/29750 Micrel

MIC29150/29300/29500/29750 Series

High-Current Low-Dropout Regulators

General Description

The MIC29150/29300/29500/29750 are high current, high
accuracy, low-dropout voltage regulators. Using Micrel's
proprietary Super ßeta PNP™ process with a PNP pass
element, these regulators feature 300mV to 370mV (full load)
dropout voltages and very low ground current. Designed for
high current loads, these devices also find applications in
lower current, extremely low dropout-critical systems, where
their tiny dropout voltage and ground current values are
important attributes.

The MIC29150/29300/29500/29750 are fully protected against
overcurrent faults, reversed input polarity, reversed lead
insertion, overtemperature operation, and positive and nega­tive transient voltage spikes. Five pin fixed voltage versions
feature logic level ON/OFF control and an error flag which
signals whenever the output falls out of regulation. Flagged
states include low input voltage (dropout), output current
limit, overtemperature shutdown, and extremely high voltage
spikes on the input.

On the MIC29xx1 and MIC29xx2, the ENABLE pin may be
tied to V
MIC29150/29300/29500 are available in 3- and 5-pin TO-220
and surface mount TO-263 packages. The MIC29750 7.5A
regulators are available in 3- and 5-pin TO-247 packages.

if it is not required for ON/OFF control. The

IN

Features

• High Current Capability

MIC29150/29151/29152/29153................................1.5A

MIC29300/29301/29302/29303...................................3A

MIC29500/29501/29502/29503...................................5A

MIC29750/29751/29752...........................................7.5A

• Low-Dropout Voltage .......................350mV at Full Load

• Low Ground Current

• Accurate 1% Guaranteed Tolerance

• Extremely Fast Transient Response

• Reverse-battery and “Load Dump” Protection

• Zero-Current Shutdown Mode (5-Pin versions)

• Error Flag Signals Output Out-of-Regulation
(5-Pin versions)

• Also Characterized For Smaller Loads With Industry­Leading Performance Specifications

• Fixed Voltage and Adjustable Versions

Applications

• Battery Powered Equipment

• High-Efficiency “Green” Computer Systems

• Automotive Electronics

• High-Efficiency Linear Power Supplies

• High-Efficiency Post-Regulator For Switching Supply

Pin Configuration

1 2 3

MIC29150/29300/

29500BT and

MIC29750BWT

1 2 3 4 5

MIC29151/29152/29153BT
MIC29301/29302/29303BT
MIC29501/29502/29503BT

MIC29751/29752BWT

1 2 3

MIC29150/29300BU

Pinout On all devices, the Tab is grounded.

MIC29150/29300/29500/29750 Three Terminal
Devices:

Pin 1 = Input, 2 = Ground, 3 = Output

MIC29151/29301/29501/29751 Five Terminal
Fixed Voltage Devices:

Pin 1 = Enable, 2 = Input, 3 = Ground, 4 = Output,
5 = Flag

MIC29152/29302/29502/29752 Adjustable with
ON/OFF Control

Pin 1 = Enable, 2 = Input, 3 = Ground, 4 = Output,
5 = Adjust

MIC29153/29303/29503 Adjustable with Flag

Pin 1 = Flag, 2 = Input, 3 = Ground, 4 = Output,
5 = Adjust

1 2 3 4 5

MIC29151/29152/29153BU
MIC29301/29302/29303BU
MIC29501/29502/29503BU

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

March 2000 1 MIC29150/29300/29500/29750

MIC29150/29300/29500/29750 Micrel

Ordering Information

Part Number Temp. Range* VoltsCurrent Package

MIC29150-3.3BT –40 to +125°C 3.3 1.5A TO-220
MIC29150-4.2BT –40 to +125°C 4.2 1.5A TO-220
MIC29150-5.0BT –40 to +125°C 5.0 1.5A TO-220
MIC29150-12BT –40 to +125°C 12 1.5A TO-220
MIC29150-3.3BU –40 to +125°C 3.3 1.5A TO-263
MIC29150-5.0BU –40 to +125°C 5.0 1.5A TO-263
MIC29150-12BU –40 to +125°C 12 1.5A TO-263
MIC29151-3.3BT –40 to +125°C 3.3 1.5A TO-220-5
MIC29151-5.0BT –40 to +125°C 5.0 1.5A TO-220-5
MIC29151-12BT –40 to +125°C 12 1.5A TO-220-5
MIC29151-3.3BU –40 to +125°C 3.3 1.5A TO-263-5
MIC29151-5.0BU –40 to +125°C 5.0 1.5A TO-263-5
MIC29151-12BU –40 to +125°C 12 1.5A TO-263-5
MIC29152BT –40 to +125°C Adj 1.5A TO-220-5
MIC29152BU –40 to +125°C Adj 1.5A TO-263-5
MIC29153BT –40 to +125°C Adj 1.5A TO-220-5
MIC29153BU –40 to +125°C Adj 1.5A TO-263-5
MIC29300-3.3BT –40 to +125°C 3.3 3.0A TO-220
MIC29300-5.0BT –40 to +125°C 5.0 3.0A TO-220
MIC29300-12BT –40 to +125°C 12 3.0A TO-220
MIC29300-3.3BU –40 to +125°C 3.3 3.0A TO-263
MIC29300-5.0BU –40 to +125°C 5.0 3.0A TO-263
MIC29300-12BU –40 to +125°C 12 3.0A TO-263
MIC29301-3.3BT –40 to +125°C 3.3 3.0A TO-220-5
MIC29301-5.0BT –40 to +125°C 5.0 3.0A TO-220-5
MIC29301-12BT –40 to +125°C 12 3.0A TO-220-5
MIC29301-3.3BU –40 to +125°C 3.3 3.0A TO-263-5
MIC29301-5.0BU –40 to +125°C 5.0 3.0A TO-263-5
MIC29301-12BU –40 to +125°C 12 3.0A TO-263-5
MIC29302BT –40 to +125°C Adj 3.0A TO-220-5
MIC29302BU –40 to +125°C Adj 3.0A TO-263-5
MIC29303BT –40 to +125°C Adj 3.0A TO-220-5
MIC29303BU –40 to +125°C Adj 3.0A TO-263-5

Part Number Temp. Range* VoltsCurrent Package

MIC29500-3.3BT –40 to +125°C 3.3 5.0A TO-220
MIC29500-5.0BT –40 to +125°C 5.0 5.0A TO-220
MIC29501-3.3BT –40 to +125°C 3.3 5.0A TO-220-5
MIC29501-5.0BT –40 to +125°C 5.0 5.0A TO-220-5
MIC29501-3.3BU –40 to +125°C 3.3 5.0A TO-263-5
MIC29501-5.0BU –40 to +125°C 5.0 5.0A TO-263-5
MIC29502BT –40 to +125°C Adj 5.0A TO-220-5
MIC29502BU –40 to +125°C Adj 5.0A TO-263-5
MIC29503BT –40 to +125°C Adj 5.0A TO-220-5
MIC29503BU –40 to +125°C Adj 5.0A TO-263-5
MIC29750-3.3BWT –40 to +125°C 3.3 7.5A TO-247-3
MIC29750-5.0BWT –40 to +125°C 5.0 7.5A TO-247-3
MIC29751-3.3BWT –40 to +125°C 3.3 7.5A TO-247-5
MIC29751-5.0BWT –40 to +125°C 5.0 7.5A TO-247-5
MIC29752BWT –40 to +125°C Adj 7.5A TO-247-5

* Junction Temperature

MIC29xx0 versions are 3-terminal fixed voltage devices.
MIC29xx1 are fixed voltage devices with ENABLE and ERROR
flag. MIC29xx2 are adjustable regulators with ENABLE control.
MIC29xx3 are adjustables with an ERROR flag.

MIC29150/29300/29500/29750 2 March 2000

MIC29150/29300/29500/29750 Micrel

Absolute Maximum Ratings

Power Dissipation ....................................Internally Limited

Lead Temperature (Soldering, 5 seconds)................260°C

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

Input Supply Voltage (Note 1) ....................... –20V to +60V

Operating Ratings

Operating Junction Temperature .............–40°C to +125°C

Maximum Operating Input Voltage............................... 26V

TO-220 θJC.............................................................. 2°C/W

TO-263 θJC.............................................................. 2°C/W

TO-247 θJC........................................................... 1.5°C/W

Electrical Characteristics

All measurements at TJ = 25°C unless otherwise noted. Bold values are guaranteed across the operating temperature range.
Adjustable versions are programmed to 5.0V.

Parameter Condition Min Typ Max Units

Output Voltage IO = 10mA –1 1 %

10mA ≤ IO ≤ IFL, (V
Line Regulation IO = 10mA, (V
Load Regulation VIN = V
∆V

O

∆T Temperature Coef.
Dropout Voltage ∆V

Output Voltage(Note 6) 20 100 ppm/°C

OUT

OUT

+ 5V, 10mA ≤ I

OUT

= – 1%, (Note 3)

MIC29150 I

I
I

MIC29300 I

I
I

MIC29500 I

I
I

MIC29750 I

I
IO = 7.5A 425 600

Ground Current MIC29150 I

I

MIC29300 I

I

MIC29500 I

I

MIC29750 I

IO = 7.5A 120

I

Ground Pin VIN = 0.5V less than specified V

GNDDO

Current at Dropout MIC29150 0.9 mA

MIC29300 1.7 mA

MIC29500 2.1 mA

MIC29750 3.1 mA
Current Limit MIC29150 V

MIC29300 V

MIC29500 V

MIC29750 V
en, Output Noise CL = 10µF 400 µV (rms)

Voltage
(10Hz to 100kHz) CL = 33µF 260
IL = 100mA

Ground Current in Shutdown MIC29150/1/2/3 only VEN= 0.4V 2 10 µA

+ 1V) ≤ VIN ≤ 26V (Note 2) –2 2 %

OUT

+ 1V) ≤ VIN ≤ 26V 0.06 0.5 %

≤ I

OUT

FULL LOAD

= 100mA 80 200 mV

O

= 750mA 220

O

= 1.5A 350 600

O

= 100mA 80 175

O

= 1.5A 250

O

= 3A 370 600

O

= 250mA 125 250

O

= 2.5A 250

O

= 5A 370 600

O

= 250mA 80 200

O

= 4A 270

O

= 750mA, VIN = V

O

= 1.5A 22

O

= 1.5A, VIN = V

O

= 3A 37

O

= 2.5A, VIN = V

O

= 5A 70

O

= 4A, VIN = V

O

= 0V (Note 4) 2.1 3.5 A

OUT

= 0V (Note 4) 4.5 5.0 A

OUT

= 0V (Note 4) 7.5 10.0 A

OUT

= 0V (Note 4) 9.5 15 A

OUT

OUT

OUT

OUT

+ 1V 35 75 mA

OUT

. I

OUT

OUT

(Note 2, 6) 0.2 1 %

+ 1V 8 20 mA
+ 1V 10 35 mA
+ 1V 15 50 mA

= 10mA

30 µA

March 2000 3 MIC29150/29300/29500/29750

MIC29150/29300/29500/29750 Micrel

Electrical Characteristics (Continued)

Reference MIC29xx2/MIC29xx3

Parameter Conditions Min Typical Max Units

Reference Voltage 1.228 1.240 1.252 V

1.215 1.265 V max
Reference Voltage (Note 8) 1.203 1.277 V
Adjust Pin 40 80 nA

Bias Current 120
Reference Voltage (Note 7) 20 ppm/°C

Temperature
Coefficient

Adjust Pin Bias 0.1 nA/°C
Current Temperature
Coefficient

Flag Output (Error Comparator)

Output Leakage V
Current 2.00

Output Low Device set for 5V. V
Voltage I

Upper Threshold Device set for 5V (Note 9) 40 60 mV
Voltage 25

Lower Threshold Device set for 5V (Note 9) 75 95 mV
Voltage 140

Hysteresis Device set for 5V (Note 9) 15 mV

ENABLE Input

Input Logic Voltage V
Low (OFF) 0.8
High (ON) 2.4

Enable Pin V
Input Current 750

OL

MIC29xx1/MIC29xx2

VEN =0.8V 1 µA

MIC29xx1/29xx3

= 26V 0.01 1.00 µA

OH

= 4.5V 220 300 mV

= 250µA 400

= 26V 100 600 µA

EN

IN

2

Regulator Output (Note 10) 10 µA
Current in Shutdown 500

MIC29150/29300/29500/29750 4 March 2000

MIC29150/29300/29500/29750 Micrel

5

Notes

Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (≤1%). The maximum continuous supply

Note 2: Full Load current (I
Note 3: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with V

Note 4: VIN = V

Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground

Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 7: 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

Note 8: V
Note 9: Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured at

Note 10: VEN ≤ 0.8V and VIN ≤ 26V, V
Note 11: When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to

voltage is 26V.

) is defined as 1.5A for the MIC29150, 3A for the MIC29300, 5A for the MIC29500, and 7.5A for the MIC29750 families.

FL

to V

IN

OUT (nominal)

minimize temperature rise.

+ 1V. For example, use VIN = 4.3V for a 3.3V regulator or use 6V for a 5V regulator. Employ pulse-testing procedures to

+ 1V applied

OUT

pin current.

regulation effects. Specifications are for a 200mA load pulse at VIN = 20V (a 4W pulse) for T = 10ms.

≤ V

REF

6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V
example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.240 V = 384
mV. Thresholds remain constant as a percent of V

7.7% guaranteed.

≤ (VIN – 1 V), 2.3V ≤ VIN ≤ 26V, 10mA < IL ≤ IFL, TJ ≤ T

OUT

as V

OUT

= 0.

OUT

J MAX.

/V

OUT

is varied, with the dropout warning occurring at typically 5% below nominal,

OUT

= (R1 + R2)/R2. For

REF

ground.

Block Diagram

IN

FLAG

EN

Typical Applications

V ± 5%

MIC29500-3.3

1.180V
Reference

3.3V ± 1% @ 5A

47µF

1.240V

O.V.
I

LIMIT

28V

Thermal

Shut­down

* Feedback network in fixed versions only

†

Adjustable version only

V

IN

R1

V

R1*

R2*

OUT

OUT

ADJ

GND

†

R2

V

= 1.240V × [1 + (R1 / R2)]

OUT

Figure 1. Fixed output voltage. Figure 2. Adjustable output voltage configuration. For

best results, the total series resistance should be small
enough to pass the minimum regulator load current.

March 2000 5 MIC29150/29300/29500/29750

MIC29150/29300/29500/29750 Micrel

Typical Characteristics MIC2915x

MIC2915x Dropout Voltage

vs. Output Current

450
400
350
300
250
200
150
100

50

DROPOUT VOLTAGE (mV)

0

0.0 0.5 1.0 1.5
OUTPUT CURRENT (A)

MIC2915x Ground Current

vs. Output Current

25

20

15

10

5

GROUND CURRENT (mA)

0

0.0 0.4 0.8 1.2 1.6
OUTPUT CURRENT (A)

MIC2915x Dropout Voltage

0.8

0.7

0.6

0.5

0.4

0.3

0.2

DROPOUT VOLTAGE (V)

0.1

vs. Temperature

I

= 1.5A

LOAD

0

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC2915x Ground Current

vs. Supply Voltage

1.2

1.0

0.8

0.6

0.4

0.2

GROUND CURRENT (mA)

0.0
0246810

SUPPLY VOLTAGE (V)

V

OUT

I

LOAD

= 5V
= 10mA

MIC29150-5.0

Dropout Characteristics

5.0

4.0
I

= 10mA

OUT

3.0

I

2.0

1.0

OUTPUT VOLTAGE (V)

0.0

0123456

INPUT VOLTAGE (V)

OUT

= 1.5A

MIC2915x Ground Current

vs. Supply Voltage

60

50

40

30

20

10

GROUND CURRENT (mA)

0

0246810

SUPPLY VOLTAGE (V)

MIC29152
I

= 1.5A

OUT

MIC2915x Ground Current

300

250

200

150

100

GROUND CURRENT (µA)

vs. Temperature

I

= 10mA

LOAD

50

0

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC29150-3.3 Output

Voltage vs. Temperature

3.40

3.38

3.36

3.34

3.32

3.30

3.28

3.26

3.24

OUTPUT VOLTAGE (V)

3.22

3.20

3 DEVICES

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC2915x Ground Current

2.5

2.0

1.5

1.0

0.5

GROUND CURRENT (mA)

0.0

vs. Temperature

I

= 250mA

LOAD

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC29150-3.3 Short Circuit

Current vs. Temperature

3.0

2.5

2.0

1.5

1.0

CURRENT (A)

0.5

0.0

V

= 0V

OUT

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC2915x Ground Current

vs. Temperature

30

25

20

I

= 1.5A

15

10

5

GROUND CURRENT (mA)

0

-60 -30 0 30 60 90 120 150

LOAD

TEMPERATURE (°C)

MIC2915x Ground Current

vs. Input Voltage

1.2
R

= 100Ω

LOAD

V

= 5V

OUT

-30 -20 -10 0 10 20 30

INPUT VOLTAGE (V)

GROUND CURRENT (µA)

1.0

0.8

0.6

0.4

0.2

0.0

-0.2

MIC29150/29300/29500/29750 6 March 2000

MIC29150/29300/29500/29750 Micrel

-20

-10

0

10

20

30

∆ OUTPUT (mV)

4

6

8

10

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

INPUT (V)

TIME (ms)

0.001

0.01

0.1

1

10

10x10

0

100x10

0

1x10

3

10x10

3

100x10

3

1x10

6

OUTPUT IMPEDANCE (Ω)

FREQUENCY (Hz)

MIC29151-xx/2 Enable Current

30

25

20

15

10

ENABLE CURRENT (µA)

vs. Temperaure

VEN = 5V

VEN = 2V

5

0

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC29152/3 Adjust Pin Current

vs. Temperature

50

40

30

20

I

10

ADJUST PIN CURRENT (nA)

0

-60 -30 0 30 60 90 120 150

= 10mA

LOAD

TEMPERATURE (°C)

MIC2915x

400

200

∆ OUTPUT (mV)

-200

2.0

1.5

1.0

0.5

0.0

OUTPUT (A)

-0.5

Load Transient

C

= 10 µF

OUT

0

I

= 10mA

LOAD

-5 0 5 10 15 20 25

TIME (ms)

MIC2915x

Line Transient

C

OUT

I

LOAD

= 10 µF

= 10mA

MIC2915x

200
100

-100

∆ OUTPUT (mV)

-200

2.0

1.5

1.0

0.5

0.0

OUTPUT (A)

-0.5

Load Transient

C

= 100 µF

OUT

0

I

= 10mA

LOAD

-5 0 5 10 15 20 25

TIME (ms)

MIC2915x

10

∆ OUTPUT (mV)

10

INPUT (V)

Line Transient

C

= 100 µF

5

0

-5

8

6

4

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

OUT

I

LOAD

TIME (ms)

= 10mA

March 2000 7 MIC29150/29300/29500/29750

MIC2915x Output Impedance

vs. Frequency

MIC29150/29300/29500/29750 Micrel

Typical Characteristics MIC2930x

MIC2930x Dropout Voltage

0.40

0.35

0.30

0.25

0.20

0.15

0.10

DROPOUT VOLTAGE (V)

0.05

0.00

vs. Output Current

0123

OUTPUT CURRENT (A)

MIC2930x Ground Current

vs. Output Current

50

40

30

20

10

GROUND CURRENT (mA)

0

0123

OUTPUT CURRENT (A)

MIC2930x Dropout Voltage

0.8

0.7

0.6

0.5

0.4

0.3

0.2

DROPOUT VOLTAGE (V)

0.1

vs. Temperature

I

= 3A

LOAD

0

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC2930x Ground Current

vs. Supply Voltage

2.0

1.5

1.0

0.5

GROUND CURRENT (mA)

0.0
0246810

FIXED 3.3V DEVICE
R

= 100Ω

LOAD

SUPPLY VOLTAGE (V)

MIC29300-3.3

Dropout Characteristics

5.0

4.0
I

= 10mA

LOAD

3.0

2.0

1.0

OUTPUT VOLTAGE (V)

0.0

0246

I

= 3A

LOAD

INPUT VOLTAGE (V)

MIC2930x Ground Current

vs. Supply Voltage

125

100

75

50

25

GROUND CURRENT (mA)

0

0246810

SUPPLY VOLTAGE (V)

FIXED 3.3V
I

= 3A

OUT

MIC2930x Ground Current

0.5

0.4

0.3

0.2

0.1

GROUND CURRENT (mA)

0.0

vs. Temperature

I

= 10mA

OUT

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC29300-3.3 Output Voltage

3.40

3.38

3.36

3.34

3.32

3.30

3.28

3.26

3.24

OUTPUT VOLTAGE (V)

3.22

3.20

vs. Temperature

3 DEVICES

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC2930x Ground Current

2.0

1.5

1.0

0.5

GROUND CURRENT (mA)

0.0

vs. Temperature

I

= 250mA

OUT

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC29300-5.0 Short Circuit

Current vs. Temperature

8
7
6
5
4
3

CURRENT (A)

2
1
0

-60 -30 0 30 60 90 120 150

V

= 0V

OUT

TEMPERATURE (°C)

MIC2930x Ground Current

vs. Temperature

60

50

I

= 3A

40

30

20

10

GROUND CURRENT (mA)

0

-60 -30 0 30 60 90 120 150

OUT

TEMPERATURE (°C)

MIC2930x Ground Current

vs. Input Voltage

2.0

1.5

1.0

0.5

0.0

GROUND CURRENT (mA)

-0.5

-30 -20 -10 0 10 20 30

R

= 100Ω

LOAD

INPUT VOLTAGE (V)

MIC29150/29300/29500/29750 8 March 2000

MIC29150/29300/29500/29750 Micrel

-200

0

200

400

600

800

∆ OUTPUT (mV)

-1

0

1

2

3

4

-5 0 5 10 15 20 25

OUTPUT (A)

TIME (ms)

0.001

0.01

0.1

1

10

10x10

0

100x10

0

1x10

3

10x10

3

100x10

3

1x10

6

OUTPUT IMPEDANCE (Ω)

FREQUENCY (Hz)

MIC29301-x/2 Enable Current

30

25

20

15

10

ENABLE CURRENT (µA)

vs. Temperaure

VEN = 5V

VEN = 2V

5

0

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC29302/3 Adjust Pin Current

vs. Temperature

50

40

30

20

10

ADJUST PIN CURRENT (nA)

0

-60 -30 0 30 60 90 120 150

I

= 10mA

LOAD

TEMPERATURE (°C)

MIC2930x

Load Transient

C

= 10 µF

OUT

I

= 10mA

LOAD

MIC2930x

40
20

-20

∆ OUTPUT (mV)

8.3

-40

6.3

4.3

INPUT (V)

2.3

Line Transient

C

= 10 µF

OUT

0

I

= 10mA

LOAD

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

TIME (ms)

MIC2930x

100

-50

∆ OUTPUT (mV)

-100

OUTPUT (A)

Load Transient

C

= 100 µF

50

0

4

3
2
1
0

-1

-5 0 5 10 15 20 25

OUT

I

LOAD

TIME (ms)

= 10mA

MIC2930x

15
10

∆ OUTPUT (mV)

8.3

-10

6.3

4.3

INPUT (V)

2.3

Line Transient

C

= 100 µF
5
0

-5

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

OUT

I

LOAD

TIME (ms)

= 10mA

March 2000 9 MIC29150/29300/29500/29750

MIC2930x Output Impedance

vs. Frequency

MIC29150/29300/29500/29750 Micrel

Typical Characteristics MIC2950x

MIC2950x Dropout Voltage

vs. Output Current

450
400
350
300
250
200
150
100

DROPOUT VOLTAGE (V)

50

0

012345

OUTPUT CURRENT (A)

MIC2950x Ground Current

vs. Output Current

80
70
60
50
40
30
20
10

GROUND CURRENT (mA)

0

0123456

OUTPUT CURRENT (A)

MIC2950x Dropout Voltage

0.8

0.7

0.6

0.5

0.4

0.3

0.2

DROPOUT VOLTAGE (V)

0.1

vs. Temperature

I

= 5A

LOAD

0

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC2950x Ground Current

vs. Supply Voltage

3.0
FIXED 3.3V VERSIONS
R

2.5

2.0

1.5

1.0

0.5

GROUND CURRENT (mA)

0.0

0246810

= 100Ω

LOAD

SUPPLY VOLTAGE (V)

MIC29500-3.3

Dropout Characteristics

5.0

4.0
I

= 10mA

LOAD

3.0

I

2.0

1.0

OUTPUT VOLTAGE (V)

0.0

0246

INPUT VOLTAGE (V)

LOAD

= 5A

MIC2950x Ground Current

vs. Supply Voltage

125

100

75

50

FIXED 3.3V

25

GROUND CURRENT (mA)

0

012345

SUPPLY VOLTAGE (V)

VERSION
I

= 5A

LOAD

MIC2950x Ground Current

0.5

0.4

0.3

0.2

0.1

GROUND CURRENT (mA)

0.0

vs. Temperature

I

= 10mA

OUT

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC29500-3.3 Output Voltage

3.40

3.38

3.36

3.34

3.32

3.30

3.28

3.26

3.24

OUTPUT VOLTAGE (V)

3.22

3.20

vs. Temperature

3 DEVICES

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC2950x Ground Current

vs. Temperature

4

3

2

I

1

GROUND CURRENT (mA)

0

-60 -30 0 30 60 90 120 150

= 500mA

OUT

TEMPERATURE (°C)

MIC2950x-5.0 Short Circuit

Current vs. Temperature

10

9
8
7
6
5
4

CURRENT (A)

3
2
1
0

-60 -30 0 30 60 90 120 150

V

= 0V

OUT

TEMPERATURE (°C)

MIC2950x Ground Current

150

125

100

GROUND CURRENT (mA)

vs. Temperature

I

= 5A

OUT

75

50

25

0

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC2950x Ground Current

2.5

2.0

1.5

1.0

0.5

0.0

GROUND CURRENT (mA)

-0.5

vs. Input Voltage

R

= 100Ω

LOAD

-30 -20 -10 0 10 20 30

INPUT VOLTAGE (V)

MIC29150/29300/29500/29750 10 March 2000

MIC29150/29300/29500/29750 Micrel

-500

0

500

1000

1500

∆ OUTPUT (mV)

-1

0

1

2

3

4

5

6

-5 0 5 10 15 20 25

OUTPUT (A)

TIME (ms)

-100

-50

0

50

100

∆ OUTPUT (mV)

2.2

4.2

6.2

8.2

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

INPUT (V)

TIME (ms)

0.001

0.01

0.1

1

10

10x10

0

100x10

0

1x10

3

10x10

3

100x10

3

1x10

6

OUTPUT IMPEDANCE (Ω)

FREQUENCY (Hz)

MIC29501-xx/2 Enable Current

30

25

20

15

10

ENABLE CURRENT (µA)

vs. Temperaure

VEN = 5V

VEN = 2V

5

0

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC29502/3 Adjust Pin Current

vs. Temperature

80
70
60
50
40
30
20
10

ADJUST PIN CURRENT (nA)

0

-60 -30 0 30 60 90 120 150

I

= 10mA

LOAD

TEMPERATURE (°C)

MIC2950x

Load Transient

C

= 10 µF

OUT

I

= 10mA

LOAD

MIC2950x

Line Transient

C

= 10 µF

OUT

I

= 10mA

LOAD

MIC2950x

100

-50

∆ OUTPUT (mV)

-100

OUTPUT (A)

Load Transient

C

= 100 µF

50

0

6

5
4
3
2
1
0

-1

-5 0 5 10 15 20 25

OUT

I

LOAD

TIME (ms)

= 10mA

MIC2950x

Line Transient

20
10

0

-10

∆ OUTPUT (mV)

8.2

-20

6.2

4.2

INPUT (V)

2.2

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

C

OUT

I

LOAD

TIME (ms)

= 100 µF

= 10mA

March 2000 11 MIC29150/29300/29500/29750

MIC2950x Output Impedance

vs. Frequency

MIC29150/29300/29500/29750 Micrel

Typical Characteristics MIC2975x

MIC2975x Dropout Voltage

vs. Output Current

450
400
350
300
250
200
150
100

50

DROPOUT VOLTAGE (mV)

0

012345678

OUTPUT CURRENT (A)

MIC2975x Ground Current

vs. Output Current

120

100

80

60

40

20

GROUND CURRENT (mA)

0

012345678

OUTPUT CURRENT (A)

MIC2975x Dropout Voltage

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

DROPOUT VOLTAGE (V)

0.1

0.0

vs. Temperature

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC2975x Ground Current

vs. Supply Voltage

3.5

3.0

2.5

2.0

1.5

1.0

0.5

GROUND CURRENT (mA)

0.0
0246810

FIXED 3.3V
VERSION
I

= 10mA

OUT

SUPPLY VOLTAGE (V)

MIC29750-3.3

Dropout Characteristics

5.0

4.0
I

= 10mA

LOAD

3.0

I

2.0

1.0

OUTPUT VOLTAGE (V)

0.0

0246

INPUT VOLTAGE (V)

LOAD

= 7.5A

MIC2975x Ground Current

vs. Supply Voltage

175
150
125
100

75
50
25

GROUND CURRENT (mA)

0

FIXED 3.3V VERSION
I

= 7.5A

LOAD

02468

SUPPLY VOLTAGE (V)

MIC2975x Ground Current

0.5

0.4

0.3

0.2

0.1

GROUND CURRENT (mA)

0.0

vs. Temperature

I

= 10mA

OUT

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC29750-3.3 Output Voltage

3.40

3.38

3.36

3.34

3.32

3.30

3.28

3.26

3.24

OUTPUT VOLTAGE (V)

3.22

3.20

vs. Temperature

3 DEVICES

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC2975x Ground Current

vs. Temperature

4

3

2

1

GROUND CURRENT (mA)

0

-60 -30 0 30 60 90 120 150

I

= 250mA

OUT

TEMPERATURE (°C)

MIC29750-5.0 Short Circuit

Current vs. Temperature

12
11
10

9
8
7
6
5
4

CURRENT (A)

3
2
1
0

-60 -30 0 30 60 90 120 150

V

= 0V

OUT

TEMPERATURE (°C)

MIC2975x Ground Current

200

150

100

GROUND CURRENT (mA)

vs. Temperature

I

= 7.5A

OUT

50

0

-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)

MIC2975x Ground Current

vs. Input Voltage

3.5

3.0

2.5

2.0

1.5
R

= 100Ω

LOAD

1.0

0.5

0.0

GROUND CURRENT (mA)

-0.5

-30 -20 -10 0 10 20 30

INPUT VOLTAGE (V)

MIC29150/29300/29500/29750 12 March 2000

MIC29150/29300/29500/29750 Micrel

-500

0

500

1000

1500

∆ OUTPUT (mV)

-2.5

0.0

2.5

5.0

7.5

10.0

-5 0 5 10 15 20 25

OUTPUT (A)

TIME (ms)

-100

-50

0

50

100

∆ OUTPUT (mV)

2.3

4.3

6.3

8.3

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

INPUT (V)

TIME (ms)

0.001

0.01

0.1

1

10

10x10

0

100x10

0

1x10

3

10x10

3

100x10

3

1x10

6

OUTPUT IMPEDANCE (Ω)

FREQUENCY (Hz)

MIC29751-xx/2 Enable Current

30

25

20

15

10

ENABLE CURRENT (µA)

vs. Temperaure

VEN = 5V

VEN = 2V

5

0

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

MIC29752/3 Adjust Pin Current

vs. Temperature

80
70
60
50
40
30
20
10

ADJUST PIN CURRENT (nA)

0

-60 -30 0 30 60 90 120 150

I

= 10mA

LOAD

TEMPERATURE (°C)

MIC2975x

Load Transient

C

= 10 µF

OUT

I

= 10mA

LOAD

MIC2975x

Line Transient

C

= 10 µF

OUT

I

= 10mA

LOAD

MIC2975x

300
200
100

-100

∆ OUTPUT (mV)

-200

10.0

7.5

5.0

2.5

0.0

OUTPUT (A)

-2.5

Load Transient

C

= 100 µF

OUT

0

I

= 10mA

LOAD

-5 0 5 10 15 20 25

TIME (ms)

MIC2975x

Line Transient

30
20
10

0

-10

∆ OUTPUT (mV)

8.3

-20

6.3

4.3

INPUT (V)

2.3

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

C

OUT

I

LOAD

TIME (ms)

= 100 µF

= 10mA

March 2000 13 MIC29150/29300/29500/29750

MIC2975x Output Impedance

vs. Frequency

MIC29150/29300/29500/29750 Micrel

P I 1.01V V

D

OUT

IN

OUT

=−

()

Applications Information

The MIC29150/29300/29500/29750 are high performance
low-dropout voltage regulators suitable for all moderate to
high-current voltage regulator applications. Their 300mV to
400mV dropout voltage at full load make them especially
valuable in battery powered systems and as high efficiency
noise filters in “post-regulator” applications. Unlike older
NPN-pass transistor designs, where the minimum dropout
voltage is limited by the base-emitter voltage drop and
collector-emitter saturation voltage, dropout performance of
the PNP output of these devices is limited merely by the low
VCE saturation voltage.

A trade-off for the low dropout voltage is a varying base drive
requirement. But Micrel’s Super ßeta PNP™ process re­duces this drive requirement to merely 1% of the load current.

The MIC29150–29750 family of regulators is fully protected
from damage due to fault conditions. Current limiting is
provided. This limiting is linear; output current under overload
conditions is constant. Thermal shutdown disables the de­vice when the die temperature exceeds the 125°C maximum
safe operating temperature. Transient protection allows de­vice (and load) survival even when the input voltage spikes
between –20V and +60V. When the input voltage exceeds
about 35V to 40V, the overvoltage sensor temporarily dis­ables the regulator. The output structure of these regulators
allows voltages in excess of the desired output voltage to be
applied without reverse current flow. MIC29xx1 and MIC29xx2
versions offer a logic level ON/OFF control: when disabled,
the devices draw nearly zero current.

An additional feature of this regulator family is a common
pinout: a design’s current requirement may change up or
down yet use the same board layout, as all of these regulators
have identical pinouts.

First, we calculate the power dissipation of the regulator from
these numbers and the device parameters from this datasheet.

Where the ground current is approximated by 1% of I

OUT

Then the heat sink thermal resistance is determined with this
formula:

Where T

TT

θθθ

=

SA

≤ 125°C and θCS is between 0 and 2°C/W.

J MAX

−

J MAX A

P

D

−+

()

JC CS

The heat sink may be significantly reduced in applications
where the minimum input voltage is known and is large
compared with the dropout voltage. Use a series input
resistor to drop excessive voltage and distribute the heat
between this resistor and the regulator. The low dropout
properties of Micrel Super ßeta PNP regulators allow very
significant reductions in regulator power dissipation and the
associated heat sink without compromising performance.
When this technique is employed, a capacitor of at least

0.1µF is needed directly between the input and regulator
ground.

Please refer to Application Note 9 and Application Hint 17 for
further details and examples on thermal design and heat sink
specification.

Capacitor Requirements

For stability and minimum output noise, a capacitor on the
regulator output is necessary. The value of this capacitor is
dependent upon the output current; lower currents allow
smaller capacitors. MIC29150—29750 regulators are stable
with the following minimum capacitor values at full load:

.

V

IN

IN

OUT

GND

V

OUT

Figure 3. Linear regulators require only two capacitors

for operation.

Thermal Design

Linear regulators are simple to use. The most complicated
design parameters to consider are thermal characteristics.
Thermal design requires the following application-specific
parameters:

• Maximum ambient temperature, T

• Output Current, I

• Output Voltage, V

• Input Voltage, V

OUT

OUT

IN

A

Device Full Load Capacitor

MIC29150.............................. 10µF

MIC29300.............................. 10µF

MIC29500.............................. 10µF

MIC29750.............................. 22µF

This capacitor need not be an expensive low ESR type:
aluminum electrolytics are adequate. In fact, extremely low
ESR capacitors may contribute to instability. Tantalum ca­pacitors are recommended for systems where fast load
transient response is important.

Where the regulator is powered from a source with a high AC
impedance, a 0.1µF capacitor connected between Input and
GND is recommended. This capacitor should have good
characteristics to above 250kHz.

Minimum Load Current

The MIC29150–29750 regulators are specified between fi­nite loads. If the output current is too small, leakage currents
dominate and the output voltage rises. The following mini­mum load current swamps any expected leakage current
across the operating temperature range:

MIC29150/29300/29500/29750 14 March 2000

MIC29150/29300/29500/29750 Micrel

Two resistors are used. Resistors can be quite large, up to

Device Minimum Load

MIC29150.................................................... 5mA

MIC29300.................................................... 7mA

MIC29500.................................................. 10mA

MIC29750.................................................. 10mA

1MΩ, because of the very high input impedance and low bias
current of the sense comparator: The resistor values are
calculated by:

V



RR

=−

12





1.240

OUT



1





Adjustable Regulator Design

MIC29152BT

V

IN

10µF

R1

R2

V

= 1.235V × [1 + (R1 / R2)]

OUT

22µF

V

OUT

Figure 4. Adjustable Regulator with Resistors

The adjustable regulator versions, MIC29xx2 and MIC29xx3,
allow programming the output voltage anywhere between

1.25V and the 26V maximum operating rating of the family.

Where VO is the desired output voltage. Figure 4 shows
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation (see above).

Error Flag

MIC29xx1 and MIC29xx3 versions feature an Error Flag,
which looks at the output voltage and signals an error
condition when this voltage drops 5% below its expected
value. The error flag is an open-collector output that pulls low
under fault conditions. It may sink 10mA. Low output voltage
signifies a number of possible problems, including an over­current fault (the device is in current limit) and low input
voltage. The flag output is inoperative during overtempera­ture shutdown conditions.

Enable Input

MIC29xx1 and MIC29xx2 versions feature an enable (EN)
input that allows ON/OFF control of the device. Special
design allows “zero” current drain when the device is dis­abled—only microamperes of leakage current flows. The EN
input has TTL/CMOS compatible thresholds for simple inter­facing with logic, or may be directly tied to ≤ 30V. Enabling the
regulator requires approximately 20µA of current.

March 2000 15 MIC29150/29300/29500/29750

MIC29150/29300/29500/29750 Micrel

Package Information

0.151 D ±0.005

0.108 ±0.005
(2.74 ±0.13)

0.818 ±0.005
(20.78 ±0.13)

(3.84 D ±0.13)

0.410 ±0.010

(10.41 ±0.25)

0.590 ±0.005
(14.99 ±0.13)

0.356 ±0.005
(9.04 ±0.13)

0.176 ±0.005
(4.47 ±0.13)

0.050 ±0.005
(1.27 ±0.13)

7°

0.050 ±0.003
(1.27 ±.08)

0.100 ±0.005

0.065±0.010
20°±2°

(2.54 ±0.13)

0.405±0.005

0.030 ±0.003
(0.76 ±0.08)

3-Lead TO-220 (T)

0.050±0.005

0.360±0.005

1.140 ±0.010

(28.96 ±0.25)

0.018 ±0.008
(0.46 ±0.020)

7°

3°

0.100 ±0.020

DIMENSIONS:

0.176±0.005

0.050±0.005

(2.54 ±0.51)

INCH
(MM)

0.600±0.025

SEATING PLANE

+0.004

0.004

–0.008

0.100 BSC 0.050

DIM. = INCH

8° MAX

0.015 ±0.002

0.100±0.01

3-Lead TO-263 (U)

MIC29150/29300/29500/29750 16 March 2000

MIC29150/29300/29500/29750 Micrel

MOUNTING HOLE

0.125

(3.175)

DIA TYP

0.860 – 0.880

(21.844 – 22.352)

0.780 – 0.820

(19.812 – 20.828)

0.040 – 0.060

(1.016 – 1.524)

0.620 – 0.640

(15.748 – 16.256)

0.180 – 0.200

(4.572 – 5.080)

0.160 – 0.180

(4.064 – 4.572)

0.250

(6.350)

MAX

0.070 – 0.090

(1.778 – 2.286)

0.110 – 0.130

(2.794 – 3.302)

15° TYP

15° TYP

7° TYP

0.190 – 0.210

(4.826 – 5.334)

Dimensions:

inch

(mm)

0.070 – 0.090

(1.778 – 2.286)

0.025 – 0.035

(0.635 – 0.889)

0.200

(5.080)

BSC

3-Lead TO-247 (WT)

March 2000 17 MIC29150/29300/29500/29750

MIC29150/29300/29500/29750 Micrel

0.108 ±0.005
(2.74 ±0.13)

0.067 ±0.005

(1.70 ±0.127)

0.268 REF
(6.81 REF)

0.400 ±0.015
(10.16 ±0.38)

0.150 D ±0.005
(3.81 D ±0.13)

0.241 ±0.017
(6.12 ±0.43)

0.578 ±0.018
(14.68 ±0.46)

0.550 ±0.010
(13.97 ±0.25)

0.032 ±0.005
(0.81 ±0.13)

7°

Typ.

0.018 ±0.008
(0.46 ±0.20)

Dimensions:

0.177 ±0.008
(4.50 ±0.20)

0.050 ±0.005
(1.27 ±0.13)

SEATING
PLANE

0.103 ±0.013
(2.62±0.33)

inch

(mm)

5-Lead TO-220 (T)

0.405±0.005

0.065±0.010
20°±2°

0.067±0.005 0.032±0.003

DIM. = INCH

0.050±0.005

0.360±0.005

5-Lead TO-263 (U)

0.600±0.025

8° MAX

0.015 ±0.002

0.176±0.005

0.060±0.005

SEATING PLANE

+0.004

0.004

–0.008

0.100±0.01

MIC29150/29300/29500/29750 18 March 2000

MIC29150/29300/29500/29750 Micrel

MOUNTING HOLE

0.140 – 0.143
(3.56 – 3.63)

DIA TYP

0.242 BSC
(6.15 BSC)

0.819 – 0.844

(20.80 – 21.44)

0.780 – 0.800

(19.81 – 20.32)

0.040 – 0.055

(1.02 – 1.40)

0.620 – 0.640

(15.75 – 16.26)

0.180 – 0.200
(4.57 – 5.08)

0.170 – 0.216
(4.32 – 5.49)

0.100 BSC
(2.54 BSC)

0.185 – 0.208
(4.70 – 5.28)

Dimensions:

inch

(mm)

0.080 – 0.100
(2.03 – 2.54)

0.016 – 0.031
(0.41 – 0.79)

5-Lead TO-247 (WT)

March 2000 19 MIC29150/29300/29500/29750

MIC29150/29300/29500/29750 Micrel

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

MIC29150/29300/29500/29750 20 March 2000