MICREL MIC39300-2.5BT, MIC39300-2.5BU, MIC39301-2.5BT, MIC39301-2.5BU Datasheet

MIC39300/39301 Micrel

MIC39301-2.5

IN OUT

GND

47µF

V

IN

3.3V

V

OUT

2.5V

EN FLG

ERROR FLAG
OUTPUT

ENABLE

SHUTDOWN

100kΩ

MIC39300/39301

3A Low-Voltage Low-Dropout Regulator

General Description

The MIC39300 and MIC39301 are 3.0A low-dropout linear
voltage regulators that provide a low voltage, high-current
output with a minimum of external components. Utilizing
Micrel’s proprietary Super βeta PNP™ pass element, the
MIC39300/1 offers extremely low dropout (typically 400mV at

3.0A) and low ground current (typically 36mA at 3.0A).
The MIC39300/1 is ideal for PC add-in cards that need to

convert from standard 5V or 3.3V down to new, lower core
voltages. A guaranteed maximum dropout voltage of 500mV
over all operating conditions allows the MIC39300/1 to pro­vide 2.5V from a supply as low as 3V. The MIC39300/1 also
has fast transient response for heavy switching applications.
The device requires only 47µF of output capacitance to
maintain stability and achieve fast transient response

The MIC39300/1 is fully protected with overcurrent limiting,
thermal shutdown, reversed-battery protection, reversed­leakage protection, and reversed-lead insertion. The
MIC39301 offers a TTL-logic compatible enable pin and an
error flag that indicates under voltage and over current
conditions. Offered in fixed voltages, the MIC39300/1 comes
in the TO-220 and TO-263 packages and is an ideal upgrade
to older, NPN-based linear voltage regulators.

Features

• 3.0A minimum guaranteed output current

• 500mV maximum dropout voltage over temperature

Ideal for 3.0V to 2.5V conversion

• 1% initial accuracy

• Low ground current

• Current limiting and Thermal shutdown

• Reversed-battery protection

• Reversed-leakage protection

• Fast transient response

• TO-263 and TO-220 packaging

• TTL/CMOS compatible enable pin (MIC39301 only)

• Error flag output (MIC39301 only)

Applications

• LDO linear regulator for PC add-in cards

• High-efficiency linear power supplies

• SMPS post regulator

• Multimedia and PC processor supplies

• Low-voltage microcontrollers

• StrongARM™ processor supply

Ordering Information

Part Number Voltage Junction Temp. Range Package

MIC39300-2.5BT 2.5V –40°C to +125°C 3-lead TO-220
MIC39300-2.5BU 2.5V –40°C to +125°C 3-lead TO-263
MIC39301-2.5BT 2.5V –40°C to +125°C 5-lead TO-220
MIC39301-2.5BU 2.5V –40°C to +125°C 5-lead TO-263

Typical Application

MIC39300-2.5

V

IN OUT

IN

3.3V
GND

StrongARM is a trademark of Advanced RISC Machines, Ltd.

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

MIC39300

March 2000 1 MIC39300/39301

47µF

V

OUT

2.5V

MIC39301

MIC39300/39301 Micrel

Pin Configuration

TAB

TAB

MIC39300-x.xBT

TO-220-3 (T)

MIC39301-x.xBT

TO-220-5 (T)

3 OUT
2 GND
1IN

5 FLG
4 OUT
3 GND
2IN
1EN

TAB

MIC39300-x.xBU

TO-263-3 (U)

TAB

MIC39301-x.xBU

TO-263-5 (U)

3 OUT
2 GND
1IN

5 FLG
4 OUT
3 GND
2IN
1EN

Pin Description

Pin Number Pin Number Pin Name Pin Function

MIC39300 MIC39301

1 EN Enable (Input): TTL/CMOS compatible input. Logic high = enable; logic low

or open = shutdown.

1 2 IN Unregulated Input: +16V maximum supply.

2, TAB 3, TAB GND Ground: Ground pin and TAB are internally connected.

3 4 OUT Regulator Output

5 FLG Error Flag (Ouput): Open-collector indicates an output fault condition.

Active low.

MIC39300/39301 2 March 2000

MIC39300/39301 Micrel

Absolute Maximum Ratings (Note 1)

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

Enable Voltage (VEN) ..................................................+20V

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

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

ESD, Note 3

Operating Ratings (Note 2)

Supply Voltage (VIN) .................................. +2.25V to +16V

Enable Voltage (VEN) ..................................................+16V

Maximum Power Dissipation (P

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

Package Thermal Resistance

)..................... Note 4

D(max)

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

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

Electrical Characteristics

TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted
Symbol Parameter Condition Min Typ Max Units

V

OUT

∆V

/∆T Output Voltage Temp. Coefficient, 20 100 ppm/°C

OUT

V

DO

I

GND

I

GND(do)

I

OUT(lim)

Enable Input (MIC39301)

V

EN

I

IN

I

OUT(shdn)

Flag Output (MIC39301)

I

FLG(leak)

V

FLG(do)

V

FLG

Output Voltage 10mA –1 1 %

10mA ≤ I

Line Regulation I

= 10mA, V

OUT

Load Regulation VIN = V

≤ 3A, V

OUT

OUT

+ 1V, 10mA ≤ I

OUT

+ 1V ≤ VIN ≤ 8V –2 2 %

OUT

+ 1V ≤ VIN ≤ 8V 0.06 0.5 %

≤ 3A 0.2 1 %

OUT

Note 5

Dropout Voltage, Note 6 I

Ground Current, Note 7 I

Dropout Ground Pin Current VIN ≤ V
Current Limit V

= 100mA, ∆V

OUT

I

= 750mA, ∆V

OUT

I

= 1.5A, ∆V

OUT

I

= 3A, ∆V

OUT

= 750mA, VIN = V

OUT

I

= 1.5A, VIN = V

OUT

I

= 3A, VIN = V

OUT

OUT(nominal)

= 0V, VIN = V

OUT

= –1% 80 200 mV

OUT

= –1% 200 mV

OUT

= –1% 320 mV

OUT

= –1% 400 500 mV

OUT

+ 1V 10 20 mA

OUT

+ 1V 17 mA

OUT

+ 1V 45 mA

OUT

– 0.5V, I

+ 1V 4.5 A

OUT

= 10mA 6 mA

OUT

Enable Input Voltage logic low (off) 0.8 V

logic high (on) 2.25 V

Enable Input Current VEN = V

IN

15 30 µA

75 µA

V

= 0.8V 2 µA

EN

4 µA

Shutdown Output Current Note 8 10 20 µA

Output Leakage Current VOH = 16V 0.01 1 µA

2 µA

Output Low Voltage VIN = 2.250V, IOL, = 250µA, Note 9 220 300 mV

400 mV

Low Threshold % of V

OUT

93 %
High Threshold 99.2 %
Hysteresis 1%

March 2000 3 MIC39300/39301

MIC39300/39301 Micrel

Note 1. Exceeding the absolute maximum ratings 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. P
Note 5. Output voltage temperature coefficient is ∆V
Note 6. VDO = VIN – V
Note 7. I
Note 8. VEN ≤ 0.8V, VIN ≤ 8V, and V
Note 9. For a 2.5V device, VIN = 2.250V (device is in dropout).

= (T

D(max)

is the quiescent current. IIN = I

GND

– TA) ÷ θJA, where θJA depends upon the printed circuit layout. See “Applications Information.”

J(max)

when V

OUT

decreases to 99% of its nominal output voltage with VIN = V

OUT

GND

= 0V

OUT

OUT(worst case)

+ I

OUT

.

÷ (T

J(max)

– T

J(min)

) where T

is +125°C and T

J(max)

+ 1V.

OUT

J(min)

is 0°C.

MIC39300/39301 4 March 2000