MICREL MIC39501-2.5BU, MIC39501-2.5BT, MIC39500-2.5BT, MIC39500-2.5BU Datasheet

MIC39500/39501 Micrel

MIC39500/39501

5A Low-Voltage Low-Dropout Regulator

Advance Information

General Description

The MIC39500 and MIC39501 is a 5A low-dropout linear
voltage regulator that provides a low-voltage, high-current
output with a minimum of external components. Utilizing
Micrel’s proprietary Super βeta PNP™ pass element, the
MIC39500 offers extremely low dropout (typically 400mV at
5A) and low ground current (typically 70mA at 5A).

The MIC39500 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 MIC39500 to provide

2.5V from a supply as low as 3V. The MIC39500 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 MIC39500 is fully protected with overcurrent limiting,
thermal shutdown, reversed-battery and reversed-lead in­sertion protection. The MIC39501 offers a TTL-logic-compat­ible enable pin and an error flag that indicates undervoltage
and overcurrent conditions. The MIC39500 comes in the TO­220 and TO-263 packages and is an ideal upgrade to older,
NPN-based linear voltage regulators.

Features

• 5A minimum guaranteed output current

• 500mV maximum dropout voltage over temperature

• 1% initial accuracy

• Low ground current

• Current limiting and thermal shutdown

• Reversed-battery and reversed-lead insertion protection

• Fast transient response

• TO-263 and TO-220 packages

• TTL/CMOS compatible enable pin (MIC39501 only)

• Error flag output (MIC39501 only)

Applications

• LDO linear regulator for PC add-in cards

• PowerPC™ power supplies

• High-efficiency linear power supplies

• SMPS post regulator

• Multimedia and PC processor supplies

• Low-voltage microcontrollers

• StrongARM™ processor supply

For applications requiring input voltage
greater than 16V, see the
MIC29500/1/2/3 family.

Typical Application

V

IN

3.3V

1.0µF 47µF

MIC39500-2.5

IN OUT

GND

Ordering Information

Part Number Voltage Junction Temp. Range Package

MIC39500-2.5BT 2.5V –40°C to +125°C 3-lead TO-220
MIC39500-2.5BU 2.5V –40°C to +125°C 3-lead TO-263
MIC39501-2.5BT 2.5V –40°C to +125°C 5-lead TO-220
MIC39501-2.5BU 2.5V –40°C to +125°C 5-lead TO-263

100KΩ

V

OUT

2.5V

Enable

Shutdown

V

IN

3.3V

1.0µF

MIC39501-2.5

EN

IN

FLG

OUT

GND

ERROR
FLAG OUTPUT

47µF

V

OUT

2.5V

MIC39500

MIC39501

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

June 1999 1 MIC39500/39501

MIC39500/39501 Micrel

Pin Configuration

TAB

TAB

MIC39500-x.xBT

TO-220 (T)

MIC39501-x.xBT

TO-220-5 (T)

3 OUT
2 GND
1IN

5 FLG
4 OUT
3 GND
2IN
1EN

TAB

MIC39500-x.xBU

TO-263 (U)

TAB

MIC39501-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

MIC39500 MIC39501

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 output. Active low indicates an output

fault condition.

MIC39500/39501 2 June 1999

MIC39500/39501 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

Output Voltage 10mA ≤ I

Line Regulation I

= 10mA, V

OUT

Load Regulation VIN = V

∆V

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

OUT

Note 5

V

DO

I

GND

I

GND(do)

I

OUT(lim)

e

n

Dropout Voltage, Note 6 I

Ground Current, Note 7 I

= 250mA, ∆V

OUT

I

= 2.5A, ∆V

OUT

I

= 5A, ∆V

OUT

= 2.5A, VIN = V

OUT

I

= 5A, VIN = V

OUT

Dropout Ground Pin Current VIN ≤ V
Current Limit V
Output Noise Voltage C

OUT
OUT

Enable Input (MIC39501)

V

EN

Enable Input Voltage logic low (off) 0.8 V

logic high (on) 2.4 V

I

IN

I

OUT(shdn)

Enable Input Current VEN = V

= 0.8V 2 µA

V

EN

Shutdown Output Current Note 8 10 20 µA

Flag Output (MIC39501)

I

FLG(leak)

V

FLG(do)

Output Leakage Current VOH = 16V 0.01 1 µA

Output Low Voltage VIN = 2.250V, IOL, = 250µA, Note 9 125 150 mV

≤ 5A, V

OUT

OUT

+ 1V, 10mA ≤ I

OUT

OUT

OUT

OUT(nominal)

= 0V, VIN = V
= 47µF, I

OUT

IN

+ 1V ≤ VIN ≤ 16V –11%

OUT

–2 2 %

+ 1V ≤ VIN ≤ 16V 0.06 0.5 %

≤ 5A 0.2 1 %

OUT

= –2% 125 250 mV

OUT

= –2% 320 mV

= –2% 400 500 mV

+ 1V 15 50 mA

OUT

+ 1V 70 mA

OUT

– 0.5V, I

+ 1V 7.5 A

OUT

= 100mA, 10Hz to 100kHz 260

= 10mA 2.1 mA

OUT

µV(rms)

30 35 µA

75 µA

4 µA

2 µA

200 mV

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 98% 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.

June 1999 3 MIC39500/39501