MIC29752WWT - MICROCHIP TECHNOLOGY

 2016 Microchip Technology Inc. DS20005685A-page 1

MIC2915X/30X/50X/75X

Features

• High Current Capability:

- MIC29150/29151/29152/29153: 1.5A

- MIC29300/29301/29302/29303: 3A

- MIC29500/29501/29502/29503: 5A

- MIC29751/29752: 7.5A

• Low Dropout Voltage

• 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

Industry-Leading 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

General Description

The MIC2915x/2930x/2950x/2975x are high current,

high accuracy, low dropout voltage regulators. Using

Microchip’s proprietary Super βeta PNP process with a

PNP pass element, these regulators feature 350 mV to

425 mV (full load) typical 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 MIC2915x/2930x/2950x/2975x 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 that 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 VIN if it is not required for ON/OFF control.

The MIC2915x/2930x/2950x are available in 3-pin and

5-pin TO-220 and surface mount TO-263 (D2Pak)

packages. The MIC2975x 7.5A regulators are available

in a 5-pin TO-247 package. The 1.5A, adjustable output

MIC29152 is available in a 5-pin power D-Pak

(TO-252) package.

For applications with input voltage 6V or below, see

MIC37xxx LDOs.

Package Types

MIC29150/300/500

3-Lead TO-220 (T)

(Top View)

TAB

3 OUT

2 GND

1IN

TAB

3 GND

4 OUT

5 FLG

2IN

1EN

MIC29151/301/501/751

5-Lead TO-220 Fixed Voltage (T)

(Top View)

High-Current Low Dropout Regulators

MIC2915X/30X/50X/75X

DS20005685A-page 2  2016 Microchip Technology Inc.

Package Types (Continued)

MIC29152/302/502

5-Lead TO-220 Adjustable Voltage (T)

(Top View)

TAB

3 GND

4 OUT

5 ADJ

2IN

1EN

TAB

3 GND

4 OUT

5 ADJ

2IN

1 FLG

MIC29153/303/503

5-Lead TO-220 Adjustable with Flag (T)

(Top View)

GND

OUT

FLG

MIC29751

5-Lead TO-247 Fixed Voltage (WT)

(Top View)

GND

OUT

ADJ

MIC29752

5-Lead TO-247 Adjustable Voltage (WT)

(Top View)

TAB

3 OUT

2 GND

1IN

MIC29150/300

3-Lead TO-263 (D2Pak) (UT)

(Top View)

TAB

5 FLG

4 OUT

3 GND

2IN

1EN

MIC29151/301/501

5-Lead TO-263 (D2Pak) Fixed Voltage (U)

(Top View)

TAB

5 ADJ

4 OUT

3 GND

2IN

1EN

MIC29302/502

5-Lead TO-263 (D2Pak) Adj. Voltage (U)

(Top View)

TAB

5 ADJ

4 OUT

3 GND

2IN

1 FLG

MIC29153/303/503

5-Lead TO-263 (D2Pak) Adj. with Flag (U)

(Top View)

1EN

2IN

3 GND

4 OUT

5 ADJ

MIC29152

5-Lead TO-252 (D-Pak) Adjustable Voltage (D)

(Top View)

 2016 Microchip Technology Inc. DS20005685A-page 3

MIC2915X/30X/50X/75X

Typical Application Circuits

Functional Diagram

MIC29300-3.3

10μF Tantalum

3.3V @ 3A

IN OUT

GND

CIN

OUTIN

ADJ

GND

10μF Tantalum

*R1

ȍ

*R2

ȍ

2.5VOUT@1.5A

MIC29152WD

3.3VIN

CIN

MIC29300

Fixed Output Version

MIC29152

Adjustable Output Version

* See Minimum Load Current Section

1.180V 1.240V

REFERENCE

FLAG

THERMAL

SHUT-

DOWN

OUT

ADJ†

GND

R1*

R2*

O.V.

ILIMIT

32V

* FEEDBACK NETWORK IN FIXED VERSIONS ONLY

† ADJUSTABLE VERSION ONLY

MIC2915X/30X/50X/75X

DS20005685A-page 4  2016 Microchip Technology Inc.

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings † (Note 1)

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

Enable Input Voltage (VEN) ........................................................................................................................... –0.3V to VIN

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

ESD Rating ............................................................................................................................................................ Note 2

Operating Ratings‡

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

† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.

This is a stress rating only and functional operation of the device at those or any other conditions above those indicated

in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended

periods may affect device reliability.

‡ Notice: The device is not guaranteed to function outside its operating ratings.

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

maximum continuous supply voltage is 26V. Exceeding the absolute maximum rating may damage the

device.

2: Devices are ESD sensitive. Handling precautions recommended.

 2016 Microchip Technology Inc. DS20005685A-page 5

MIC2915X/30X/50X/75X

TABLE 1-1: ELECTRICAL CHARACTERISTICS (Note 1, Note 2)

Electrical C hara cteris tics: VIN = VOUT + 1V; IOUT = 10 mA; TJ = +25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C,

unless noted.

Parameter Symbol Min. Typ. Max. Units Conditions

Output Voltage VOUT

–1 — 1

IOUT = 10 mA

–2 — 2 10 mA ≤ IOUT ≤ IFL, (VOUT + 1V) ≤ VIN

≤26V (Note 3)

Line Regulation — 0.06 0.5 % IOUT = 10 mA, (VOUT + 1V) ≤ VIN ≤ 26V

Load Regulation — 0.2 1 % VIN = VOUT + 1V, 10 mA ≤ IOUT ≤ 1.5A

(Note 3, Note 4)

∆VO/∆T—20 100 ppm/°C Output Voltage (Note 4)

Temperature Coefficient

Dropout Voltage

∆VOUT = –1% (Note 5)

—80200

MIC2915x IOUT = 100 mA

— 220 — MIC2915x IOUT = 750 mA

—350600 MIC2915x IOUT = 1.5A

—80175 MIC2930x IOUT = 100 mA

— 250 — MIC2930x IOUT = 1.5A

—370600 MIC2930x IOUT = 3A

—125250 MIC2950x IOUT = 250 mA

— 250 — MIC2950x IOUT = 2.5A

—370600 MIC2950x IOUT = 5A

—80200 MIC2975x IOUT = 250 mA

— 270 — MIC2975x IOUT = 4A

— 425 750 MIC2975x IOUT = 7.5A

Ground Current (Note 6)I

GND

—820

MIC2915x IOUT = 750 mA,

VIN = VOUT + 1V

— 22 — MIC2915x IOUT = 1.5A

—1035 MIC2930x IOUT = 1.5A,

VIN = VOUT + 1V

— 37 — MIC2930x IOUT = 3A

—1550 MIC2950x IOUT = 2.5A,

VIN = VOUT + 1V

— 70 — MIC2950x IOUT = 5A

—3575 MIC2975x IOUT = 4A,

VIN = VOUT + 1V

120 — MIC2975x IOUT = 7.5A

Ground Pin Current at

Dropout IGRNDDO

—0.9—

MIC2915x, VIN = 0.5V less than

specified VOUT × IOUT = 10 mA

—1.7— MIC2930x, VIN = 0.5V less than

specified VOUT × IOUT = 10 mA

—2.1— MIC2950x, VIN = 0.5V less than

specified VOUT × IOUT = 10 mA

—3.1— MIC2975x, VIN = 0.5V less than

specified VOUT × IOUT = 10 mA

Current Limit ILIM

—2.13.5

MIC2915x, VOUT = 0V, (Note 7)

—4.55.0 MIC2930x, VOUT = 0V, (Note 7)

—7.510.0 MIC2950x, VOUT = 0V, (Note 7)

—9.515.0 MIC2975x, VOUT = 0V, (Note 7)

MIC2915X/30X/50X/75X

DS20005685A-page 6  2016 Microchip Technology Inc.

en, Output Noise Voltage

(10Hz to 100kHz)

IL = 100 mA

—400—

µVRMS

CL = 10 µF

—260— C

L = 33 µF

Ground Current in

Shutdown

—210µA MIC29150/1/2/3 only

——30 VEN = 0.4V

Reference - MIC29xx2/MIC29xx3

Reference Voltage 1.228 1.240 1.252 V —

1.215 —1.265 VMAX

Reference Voltage 1.203 —1.277 VNote 8

Adjust Pin Bias Current —4080 nA —

——120

Reference Voltage

Temperature Coefficient —20—ppm/°CNote 9

Adjust Pin Bias Current

Temperature Coefficient —0.1—nA/°C—

Flag Output (Error Comparator) - MIC29xx1/29xx3

Output Leakage Current — 0.01 1.00 µA VOH = 26V

——2.00

Output Low Voltage VOL

—220300 mV Device set for 5V, VIN = 4.5V

IOL = 250 µA

——400

Upper Threshold Voltage 40 60 — mV Device set for 5V, (Note 10)

25 — —

Lower Threshold Voltage —7595 mV Device set for 5V, (Note 10)

——140

Hysteresis — 15 — mV Device set for 5V, (Note 10)

TABLE 1-1: ELECTRICAL CHARACTERISTICS (Note 1, Note 2) (CONTINUED)

Electrical C hara cteris tics: VIN = VOUT + 1V; IOUT = 10 mA; TJ = +25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C,

unless noted.

Parameter Symbol Min. Typ. Max. Units Conditions

 2016 Microchip Technology Inc. DS20005685A-page 7

MIC2915X/30X/50X/75X

ENABLE Input - MIC29xx1/MIC29xx2

Input Logic Voltage Low

(OFF) ——0.8 V—

Input Logic Voltage High

(ON) 2.4 — — V —

Enable Pin Input Current

—100600

µA

VEN = 26V

——750

0.7 — 2 VEN = 0.8V

—— 4

Regulator Output Current

in Shutdown —10500 µA VEN ≤ 0.8V and VIN ≤ 26V, VOUT = 0.

Note 1: Specification for packaged product only.

2: 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.

3: Full load current (IFL) is defined as 1.5A for the MIC2915x, 3A for the MIC2930x, 5A for the MIC2950x,

and 7.5A for the MIC2975x families.

4: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total

temperature range.

5: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its

normal value with VOUT + 1V applied to VIN.

6: 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 pin current.

7: VIN = VOUT (nominal) + 1V. For example, use VIN = 4.3V for a 3.3V regulator or use 6V for a 5V regulator.

Employ pulse-testing procedures to pin current.

8: VREF ≤ VOUT ≤ (VIN – 1V), 2.3V ≤ VIN ≤ 26V, 10 mA < IL ≤ IFL, TJ ≤ TJMAX.

9: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipa-

tion is applied, excluding load or line regulation effects. Specifications are for a 200 mA load pulse at VIN =

20V (a 4W pulse) for T = 10 ms.

10: Comparator thresholds are expressed in terms of a voltage differential at the adjust terminal below the

nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage

change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For 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/1.240V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the drop-

out warning occurring at typically 5% below nominal, 7.7% guaranteed.

TABLE 1-1: ELECTRICAL CHARACTERISTICS (Note 1, Note 2) (CONTINUED)

Electrical C hara cteris tics: VIN = VOUT + 1V; IOUT = 10 mA; TJ = +25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C,

unless noted.

Parameter Symbol Min. Typ. Max. Units Conditions

MIC2915X/30X/50X/75X

DS20005685A-page 8  2016 Microchip Technology Inc.

TEMPERATURE SPECIFICATIONS (Note 1)

Parameters Sym. Min. Typ. Max. Units Conditions

Temperature Ranges

Storage Temperature Range TS–65 — +150 °C —

Operating Junction Temperature TJ–40 — +125 °C —

Lead Temperature — — — +260 °C Soldering, 5 sec.

Package Thermal Resistance

Thermal Resistance TO-220 θJC —2 —°C/W—

Thermal Resistance TO-263 θJC —2 —°C/W—

Thermal Resistance TO-247 θJC —1.5 —°C/W—

Thermal Resistance TO-252 θJC —3 —°C/W—

Thermal Resistance TO-252 θJA —56 —°C/W—

Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable

junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the

maximum allowable power dissipation will cause the device operating junction temperature to exceed the

maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.

 2016 Microchip Technology Inc. DS20005685A-page 9

MIC2915X/30X/50X/75X

2.0 TYPICAL PERFORMANCE CURVES

FIGURE 2-1: MIC2915x Dropout Voltage

vs. Output Current.

FIGURE 2-2: MIC2915x Dropout Voltage

vs. Temperature.

FIGURE 2-3: MIC29150-5.0 Dropout

Characteristics.

FIGURE 2-4: MIC2915x Ground Current

vs. Output Current.

FIGURE 2-5: MIC2915x Ground Current

vs. Supply Voltage.

FIGURE 2-6: MIC2915x Ground Current

vs. Supply Voltage.

Note: The graphs and tables provided following this note are a statistical summary based on a limited number of

samples and are provided for informational purposes only. The performance characteristics listed herein

are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified

operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

MIC2915X/30X/50X/75X

DS20005685A-page 10  2016 Microchip Technology Inc.

FIGURE 2-7: MIC2915x Ground Current

vs. Temperature.

FIGURE 2-8: MIC2915x Ground Current

vs. Temperature.

FIGURE 2-9: MIC2915x Ground Current

vs. Temperature.

FIGURE 2-10: MIC29150-3.3 Output

Vo ltage vs. Temperature.

FIGURE 2-11: MIC29150-3.3 Short-Circuit

Current vs. Temperature.

FIGURE 2-12: MIC2915x Ground Current

vs. Input Voltage.

 2016 Microchip Technology Inc. DS20005685A-page 11

MIC2915X/30X/50X/75X

FIGURE 2-13: MIC29151-xx/2 Enable

Current vs. Temperature.

FIGURE 2-14: MIC2915x Load Transient.

FIGURE 2-15: MIC2915x Load Transient.

FIGURE 2-16: MIC29152/3 Adjust Pin

Current vs. Temperature.

FIGURE 2-17: MIC2915x Line Transient.

FIGURE 2-18: MIC2915x Line Transient.

MIC2915X/30X/50X/75X

DS20005685A-page 12  2016 Microchip Technology Inc.

FIGURE 2-19: MIC2915x Output

Impedance vs. Frequency.

FIGURE 2-20: MIC29152 Ground Current

vs. Temperature.

FIGURE 2-21: MIC29152 Dropout Voltage

vs. Output Current.

FIGURE 2-22: MIC2930x Dropout Voltage

vs. Output Current.

FIGURE 2-23: MIC2930x Dropout Voltage

vs. Temperature.

FIGURE 2-24: MIC29300-3.3 Dropout

Characteristics.

 2016 Microchip Technology Inc. DS20005685A-page 13

MIC2915X/30X/50X/75X

FIGURE 2-25: MIC2930x Ground Current

vs. Output Current.

FIGURE 2-26: MIC2930x Ground Current

vs. Supply Voltage.

FIGURE 2-27: MIC2930x Ground Current

vs. Supply Voltage.

FIGURE 2-28: MIC2930x Ground Current

vs. Temperature.

FIGURE 2-29: MIC2930x Ground Current

vs. Temperature.

FIGURE 2-30: MIC2930x Ground Current

vs. Temperature.

MIC2915X/30X/50X/75X

DS20005685A-page 14  2016 Microchip Technology Inc.

FIGURE 2-31: MIC29300-3.3 Output

Voltage vs. Temperature.

FIGURE 2-32: MIC29300-5.0 Short-Circuit

Current vs. Temperature.

FIGURE 2-33: MIC2930x Ground Current

vs. Input Voltage.

FIGURE 2-34: MIC29301-xx/2 Enable

Current vs. Temperature.

FIGURE 2-35: MIC2930x Load Transient.

FIGURE 2-36: MIC2930x Load Transient.

 2016 Microchip Technology Inc. DS20005685A-page 15

MIC2915X/30X/50X/75X

FIGURE 2-37: MIC29302/3 Adjust Pin

Current vs. Temperature.

FIGURE 2-38: MIC2930x Line Transient.

FIGURE 2-39: MIC2930x Line Transient.

FIGURE 2-40: MIC2930x Output

Impedance vs. Frequency.

FIGURE 2-41: MIC2930x IOUT vs. VIN –

VOUT SOA (TO-263).

FIGURE 2-42: MIC2930x IOUT vs. TA SOA

(TO-263).

MIC2915X/30X/50X/75X

DS20005685A-page 16  2016 Microchip Technology Inc.

FIGURE 2-43: MIC2930x Short-Circuit

SOA vs. Temperature (TO-263).

FIGURE 2-44: MIC2950x Dropout Voltage

vs. Output Current.

FIGURE 2-45: MIC2950x Dropout Voltage

vs. Temperature.

FIGURE 2-46: MIC29500-3.3 Dropout

Characteristics.

FIGURE 2-47: MIC2950x Ground Current

vs. Output Current.

FIGURE 2-48: MIC2950x Ground Current

vs. Supply Voltage.

 2016 Microchip Technology Inc. DS20005685A-page 17

MIC2915X/30X/50X/75X

FIGURE 2-49: MIC2950x Ground Current

vs. Supply Voltage.

FIGURE 2-50: MIC2950x Ground Current

vs. Temperature.

FIGURE 2-51: MIC2950x Ground Current

vs. Temperature.

FIGURE 2-52: MIC2950x Ground Current

vs. Temperature.

FIGURE 2-53: MIC29500-3.3 Output

Vo ltage vs. Temperature.

FIGURE 2-54: MIC2950x-5.0 Short-Circuit

Current vs. Temperature.

MIC2915X/30X/50X/75X

DS20005685A-page 18  2016 Microchip Technology Inc.

FIGURE 2-55: MIC2950x Ground Current

vs. Input Voltage.

FIGURE 2-56: MIC29501-xx/2 Enable

Current vs. Temperature.

FIGURE 2-57: MIC2950x Load Transient.

FIGURE 2-58: MIC2950x Load Transient.

FIGURE 2-59: MIC29502/3 Adjust Pin

Current vs. Temperature.

FIGURE 2-60: MIC2950x Line Transient.

 2016 Microchip Technology Inc. DS20005685A-page 19

MIC2915X/30X/50X/75X

FIGURE 2-61: MIC2950x Line Transient.

FIGURE 2-62: MIC2950x Output

Impedance vs. Frequency.

FIGURE 2-63: MIC2975x Dropout Voltage

vs. Output Current.

FIGURE 2-64: MIC2975x Dropout Voltage

vs. Temperature.

FIGURE 2-65: MIC29751-3.3 Dropout

Characteristics.

FIGURE 2-66: MIC2975x Ground Current

vs. Output Current.

MIC2915X/30X/50X/75X

DS20005685A-page 20  2016 Microchip Technology Inc.

FIGURE 2-67: MIC2975x Ground Current

vs. Supply Voltage.

FIGURE 2-68: MIC2975x Ground Current

vs. Supply Voltage.

FIGURE 2-69: MIC2975x Ground Current

vs. Temperature.

FIGURE 2-70: MIC2975x Ground Current

vs. Temperature.

FIGURE 2-71: MIC2975x Ground Current

vs. Temperature.

FIGURE 2-72: MIC29751-3.3 Output

Vo ltage vs. Temperature.

 2016 Microchip Technology Inc. DS20005685A-page 21

MIC2915X/30X/50X/75X

FIGURE 2-73: MIC29751-5.0 Short-Circuit

Current vs. Temperature.

FIGURE 2-74: MIC2975x Ground Current

vs. Input Voltage.

FIGURE 2-75: MIC29751-xx/2 Enable

Current vs. Temperature.

FIGURE 2-76: MIC2975x Load Transient.

FIGURE 2-77: MIC2975x Load Transient.

FIGURE 2-78: MIC29752 Adjust Pin

Current vs. Temperature.

MIC2915X/30X/50X/75X

DS20005685A-page 22  2016 Microchip Technology Inc.

FIGURE 2-79: MIC2975x Line Transient.

FIGURE 2-80: MIC2975x Line Transient.

FIGURE 2-81: MIC2975x Output

Impedance vs. Frequency.

 2016 Microchip Technology Inc. DS20005685A-page 23

MIC2915X/30X/50X/75X

3.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1 and Table 3-2.

TABLE 3-1: PIN FUNCTION TABLE

Pin Number

TO-220

TO-263 Pin Name Description

1 INPUT Supplies the current to the output power device.

2 GND TAB is also connected internally to the IC’s ground on D-PAK.

3 OUTPUT The regulator output voltage.

TABLE 3-2: PIN FUNCTION TABLE

Pin Number

Fixed

TO-220

TO-247

TO-263

Pin Number

Adjustable

TO-220

TO-247

TO-252

TO-263

Pin Number

Adj. w/ Flag

TO-220

TO-247

TO-263

Pin Name Description

1 1 — ENABLE CMOS compatible control input. Logic-high =

enable, logic-low = shutdown.

2 2 2 INPUT Supplies the current to the output power device.

3, TAB 3, TAB 3, TAB GND TAB is also connected internally to the IC’s ground

on D-PAK.

4 4 4 OUTPUT The regulator output voltage.

— 5 5 ADJUST Adjustable regulator feedback input that connects

to the resistor voltage divider that is placed from

OUTPUT to GND in order to set the output voltage.

5 — 1 FLAG Active-low error flag output signal that indicates an

output fault condition.

MIC2915X/30X/50X/75X

DS20005685A-page 24  2016 Microchip Technology Inc.

4.0 APPLICATION INFORMATION

The MIC2915x, MIC2930x, MIC2950x, and MIC2975x

are high-performance low-dropout voltage regulators

suitable for all moderate to high-current voltage

regulator applications. Their 350 mV to 425 mV typical

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

driver requirement. But Microchip’s Super ßeta PNP

process reduces this drive requirement to merely 1% of

the load current.

The MIC2915x/2930x/2950x/2975x family of regulators

are 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. Line transient protection allows

device and load survival even when the input voltage

spikes between –20V and +60V. When the input

voltage exceeds approximately 32V, the overvoltage

sensor 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, but use the same board layout

because all of these regulators have identical pinouts.

FIGURE 4-1: Linear Regulators Requir e

Only Two Capacitors for Operat ion.

4.1 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, TA

• Output Current, IOUT

• Output Voltage, VOUT

• Input Voltage, VIN

First, calculate the power dissipation of the regulator

from these numbers and the device parameters from

this data sheet.

EQUATION 4-1:

The ground current is approximated by 1% of IOUT

Then the heat sink thermal resistance is determined

with Equation 4-2.

EQUATION 4-2:

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 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 0.1 µF 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.

With no heat sink in the application, calculate the

junction temperature to determine the maximum power

dissipation that will be allowed before exceeding the

maximum junction temperature of the MIC29152. The

maximum power allowed can be calculated using the

MIC29xxx

IN V

OUT

GND

PDIOUT 1.01 VIN VOUT

–=

SA TJMAX TA

–

---------------------------- JC CS

+–=

Where:

TJMAX ≤ 125°C

θCS Between 0°C/W and 2°C/W

 2016 Microchip Technology Inc. DS20005685A-page 25

MIC2915X/30X/50X/75X

thermal resistance (θJA) of the D-Pak adhering to the

following criteria for the PCB design: 2 oz. copper and

100 mm2 copper area for the MIC29152.

For example, given an expected maximum ambient

temperature (TA) of +75°C with VIN = 3.3V, VOUT =

2.5V, and IOUT = 1.5A, first calculate the expected PD

using Equation 4-3:

EQUATION 4-3:

Next, calculate the junction temperature for the

expected power dissipation.

EQUATION 4-4:

Now determine the maximum power dissipation

allowed that would not exceed the IC’s maximum

junction temperature (+125°C) without the use of a

heat sink.

EQUATION 4-5:

4.2 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. The

MIC2915x/2930x/2950x/2975x regulators are stable

with the following minimum capacitor values at full load,

as noted in Table 4-1 .

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 high

AC impedance, a 0.1 µF capacitor connected between

Input and GND is recommended. This capacitor should

have good characteristics to above 250 kHz.

4.3 Minimum Load Current

The MIC2915x–2975x 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, as shown in Ta ble 4 - 2.

4.4 Adjustable Regulator Design

The adjustable regulator versions, MIC29xx2 and

MIC29xx3, allow programming the output voltage

anywhere between 1.25V and the 25V. Two resistors

are used. The resistor values are calculated by

Equation 4-6.

EQUATION 4-6:

In the equation above, VOUT is the desired output

voltage. Figure 4-2 shows component definition.

Applications with widely varying load currents may

scale the resistors to draw the minimum load current

required for proper operation (see the Minimum Load

Current sub-section).

TABLE 4-1: MINIMUM CAPACITOR

VALUES AT FULL LOAD

Device Full-Load Capacitor

MIC2915x 10 µF

MIC2930x 10 µF

MIC2950x 10 µF

MIC2975x 22 µF

PD3.3V2.5V–1.5A3.3V0.016A1.1472W=–=

TJJA PD

TA

56oC/W 1.1472W75oC+ 139.24oC

PDMAX TJMAX

–



125oC75oC–56oC/W0.893W

TABLE 4-2: MINIMUM LOAD CURRENTS

Device Minimum Load

MIC2915x 5 mA

MIC2930x 7 mA

MIC2950x 10 mA

MIC2975x 10 mA

R1R2VOUT

1.240

------------- 1–





=

MIC2915X/30X/50X/75X

DS20005685A-page 26  2016 Microchip Technology Inc.

FIGURE 4-2: Adjustable Regulator with

Resistors.

4.5 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

10 mA. 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.

4.6 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 20 µA of current.

VIN VOUT

MIC29152

22μF

10μF

 2016 Microchip Technology Inc. DS20005685A-page 27

MIC2915X/30X/50X/75X

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

3- and 5-Pin TO-263 (Fixed)* Example

XXXXXXXX

WNNNP

X.XXX

5-Pin TO-263 (Adjustable)* Example

MIC29150

8943P

3.3WU

XXX

XXXXXXX

WNNNP

MIC

29152WU

6235P

3- and 5-Pin TO-220 (Fixed)* Example

XXXXX

WNNNP

X.XXX

5-Pin TO-220 (Adjustable)* Example

XXX

XXXXXXX

WNNNP

MIC

29302WT

7404P

29301

1586P

5.0WT

MIC2915X/30X/50X/75X

DS20005685A-page 28  2016 Microchip Technology Inc.

5-Pin TO-252* Example

XXX

XXXXXXX

WNNNP<BS1><COO>

MIC

29152WD

3102P USA

5-Pin TO-247 (Fixed)* Example

XXXXX

WNNNP

XXXXXXXX-X.XXXX

5-Pin TO-247 (Adjustable)* Example

<COO>

YYWWNNN

MICREL

5943P

MIC29751-3.3WWT

USA

1642815

XXXXX

WNNNP

XXXXXXXXXXX

<COO>

YYWWNNN

MICREL

2359P

MIC29752WWT

USA

1521108

Legend: XX...X Product code or customer-specific information

Y Year code (last digit of calendar year)

YY Year code (last 2 digits of calendar year)

WW Week code (week of January 1 is week ‘01’)

NNN Alphanumeric traceability code

Pb-free JEDEC® designator for Matte Tin (Sn)

*This package is Pb-free. The Pb-free JEDEC designator ( )

can be found on the outer packaging for this package.

●, ▲, ▼Pin one index is identified by a dot, delta up, or delta down (triangle

mark).

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line, thus limiting the number of available

characters for customer-specific information. Package may or may not include

the corporate logo.

Underbar (_) and/or Overbar (⎯) symbol may not be to scale.

 2016 Microchip Technology Inc. DS20005685A-page 29

MIC2915X/30X/50X/75X

3-Lead TO-220 Package Outline and Recommended Land Pattern

Note: For the most current package drawings, please see the Microchip Packaging Specification located at