Diodes PAM3110 User Manual

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Description

The PAM3110 is a 1.5A CMOS LDO regulator that features a low

quiescent current and low dropout voltages, as well as over

temperature shutdown. The fixed output voltage of the PAM3110 is

set at the factory and trimmed to ±1.5%. The PAM3110 is stable with

a ceramic output capacitor of 4.7µF or higher.

This family of regulators can provide either a stand-alone power

supply solution or act as a post regulator for switch mode power

supplies. They are particularly suitable for applications requiring low

input and output voltages.

PAM3110 is available in SOT-223, TO-252 and TO-263-2L package.

Features

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PAM3110

1.5A LOW DROPOUT VOLTAGE CMOS REGULATOR

Pin Assignments

 DSP, FPGA and Microprocessor Power Supplies

 Output Voltages:1.2V, 1.5V,1.8V, 2.5V 3.3V and 5.0V

 Stable with a Ceramic Output Capacitor

 Dropout Voltage: 400mV@1.5A

 Low Quiescent Current

 Over Temperature Shutdown

 Short Circuit Protection

 Low Temperature Coefficient

 Pb-Free Packages

Applications

 DSP, FPGA and Microprocessor Power Supplies

 SATA Power Supply

 LCD TV/Monitors

 Wireless Devices

 Communication Devices

 Portable Electronics

 Post Regulator for SMS

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Typical Applications Circuit

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PAM3110

Pin Configuration and Description

Pin Name

VIN 3

EN 2

CTRL 4

POK 1

ADJ 7

VOUT 6

NC

GND

Exposed Pad (9)

Pin Number

SOP-8(EP) W-DFN3x3-10

7, 8, 9 Supply Input Voltage.

6 Chip Enable (Active-High).

10 Supply Voltage of ControlCircuitry.

5 Power Good Open Drain Output.

4

1, 2, 3 Output Voltage.

5

8,

— No Internal Connection.

Exposed Pad

(11)

Functional Block Diagram

Function

Set the output voltage by the feedback resistors. V

Ground. The exposed pad must be soldered to a large PCB and connected to GND formaximum powe r dissipation.

= 0.8V x (R1 + R2)/R2.

O

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PAM3110

Absolute Maximum Ratings (@T

These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground.

Parameter Rating Unit

Input Voltage 6 V

Storage Temperature -65 to +150 °C

Maximum Junction Temperature 150 °C

Lead Soldering Temperature 300, (5sec) °C

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage 2.5 to 5.5 V

Ambient Temperature Range -40 to +85

Junction Temperature Range -40 to +125

= +25°C, unless otherwise specified.)

A

= +25°C, unless otherwise specified.)

A

°C

Thermal Information

Parameter Symbol Package Max Unit

SOT-223 7

Thermal Resistance Junction to Case)

Thermal Resistance (Junction to Ambient)

Internal Power Dissipation (@TA = 25°C) PD

PAM3110

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θ

JC

θ

JA

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TO-252 7

TO-263 7

SOT-223 160

TO-252 90

TO-263 60

SOT-223 625

TO-252 1200

TO-263 2000

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°C/W

mW

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PAM3110

Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

Input Voltage Range

Output Voltage Accuracy

Dropout Voltage

Short Circuit Current

Quiescent Current

Current Limit

Line Regulation LNR

Load Regulation LDR

Over Temperature Shutdown OTS 160 °C

Over Temperature Hysteresis OTH 30 °C

Temperature Coefficient

Power Supply Ripple Rejection PSRR

PAM3110

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= +25°C, VIN = VO +0.5V, V

A

IN

IO = 1mA to 1.5A

O

= 500mA VO ≥ 2.5V

I

O

IO = 1.5A VO ≥ 2.5V

VO < 0.3V

IO = 0mA

2 A

V

≤ 2.5V, IO = 10mA

O

= VO +1.5V to VO +2.5V

V

IN

V

DROP

I

SC

I

Q

I

LIM

VO > 2.5V, IO = 10mA

= VO +0.5V to VO +1.5V

V

IN

I

= 1mA to 1.5A

O

T

40 ppm/°C

C

I

= 100mA

O

= VEN = 5V, CIN = CO = 10µF, unless otherwise specified.)

CTRL

f = 100Hz 55

f = 1kHz 50

f = 10kHz 35

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2.5 5.5 V

-1.5 1.5 %

200

400

mV

500 mA

75 150 µA

0.5 1 %/V

0.5 1 %

dB

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Typical Performance Characteristics (@T

= +25°C, CIN =4.7µF, C

A

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= 4.7µF, unless otherwise specified.)

OUT

PAM3110

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Typical Performance Characteristics (cont.) (@T

= +25°C, CIN =4.7µF, C

A

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PAM3110

= 4.7µF, unless otherwise specified.)

OUT

PAM3110

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PAM3110

Application Information

The PAM3110 family of low-dropout (LDO) regulators have several features that allow them to apply to a wide range of applications. The family

operates with very low input voltage and low dropout voltage (typically 300mV at full load), making it an efficient stand-alone power supply or

post regulator for battery or switch mode power supplies. The 1.5A output current make the PAM3110 family suitable for powering many

microprocessors and FPGA supplies.

External Capacitor Requirements

A 4.7μF or larger ceramic input bypass capacitor, connected between VIN and GND and located close to the PAM3110, is required for stability. A

4.7µF minimum value capacitor from V

additional 1 0μF or larger, low ESR capacitor is recommended at the output. A higher-value, low ESR output capacitor may be necessary if

large, fast-rise-time load transients are anticipated and the device is located several inches from the power source, especially if the minimum

input voltage of 2.5V is used.

Regulator Protection

The PAM3110 features internal current limiting, thermal protection and short circuit protection. During normal operation, the PAM3110 limits

output current to about 2A. When current limiting engages, the output voltage scales back linearly until the over current condition ends. While

current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If

the temperature of the device exceeds +150°C, thermal-protection circuitry will shut down. Once the device has cooled down to approximately

+30°C below the high temp trip point, regulator operation resumes. The short circuit current of the PAM3110 is about 0.5A when its output pin is

shorted to ground.

Thermal Information

The amount of heat that an LDO linear regulator generates is:

All integrated circuits have a maximum allowable junction temperature (T

must design the operating environment so that the operating junction temperature (T

). The two main environmental variables that a designer can use to improve thermal performance are air flow and external heat sinks. The

(T

J(MAX

purpose of thi s information is to aid the designer in determining the proper operating environment for a linear regulator that is operating at a

specific power level.

In general, the maximum expected power (P

Where:

 V

 I

For most LDO regulators, the quiescent current is insignificant compared to the average output current; therefore, the term V

neglected. The operating junction temperature is computed by adding the ambient temperature (T

regulator's power dissipation. The temperature rise is computed by multiplying the maximum expected power dissipation by the sum of the

thermal resistances between the junction and the case R

resistances are measures of how effectively an object dissipates heat. Typically, the larger the device, the more surface area available for power

dissipation so that the object’s thermal resistance will be lowers.





IVVP

OOIND

is the average input voltage.

I(AVG)

is the average output voltage.

O(AVG)

is the average output current.

O(AVG)

is the quiescent current.

(Q)

to GND is also required. To improve transient response, noise rejection, and ripple rejection, an

O

) above which normal operation is not assured. A system designer

J(MAX

) does not exceed the maximum junction temperature

J(MAX

) consumed by a linear regulator is computed as:

D(MAX)

xI I

can be

(Q)

). Thermal

θSA

), the case to heatsink (R

θJC

I(AVG)

) and the increase in temperature due to the

A

), and the heatsink to ambient (R

θCS

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Ordering Information

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PAM3110

Part Number Output Voltage Marking Package Type Standard Package

PAM3110ABA120R 1.2V

PAM3110BBA120R 1.2V

PAM3110ALA120R 1.2V

PAM3110BLA120R 1.2V

PAM3110AMB120R 1.2V

PAM3110BMB120R 1.2V

PAM3110ABA150R 1.5V

PAM3110BBA150R 1.5V

PAM3110ALA150R 1.5V

PAM3110BLA150R 1.5V

PAM3110AMB150R 1.5V

PAM3110BMB150R 1.5V

PAM3110ABA180R 1.8V

PAM3110BBA180R 1.8V

PAM3110ALA180R 1.8V

PAM3110BLA180R 1.8V

PAM3110AMB180R 1.8V

PAM3110BMB180R 1.8V

P3110B AXXYW

P3110B BXXYW

P3110C AXXYW

P3110C BXXYW

P3110C AXXYW

P3110C BXXYW

P3110C AXXYW

P3110C BXXYW

P3110E AXXYW

P3110E BXXYW

P3110E AXXYW

P3110E BXXYW

P3110E AXXYW

P3110E BXXYW

SOT-223 2500 Units/Tape&Reel

TO-252 2500 Units/Tape&Reel

TO-263-2L 800 Units/Tape&Reel

SOT-223 2500 Units/Tape&Reel

TO-252 2500 Units/Tape&Reel

TO-263-2L 800 Units/Tape&Reel

SOT-223 2500 Units/Tape&Reel

TO-252 2500 Units/Tape&Reel

TO-263-2L 800 Units/Tape&Reel

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Ordering Information (cont.)

Part Number Output Voltage Marking Package Type Standard Package

PAM3110ABA250R 2.5V

PAM3110BBA250R 2.5V

PAM3110ALA250R 2.5V

PAM3110BLA250R 2.5V

PAM3110AMB250R 2.5V

PAM3110BMB250R 2.5V

PAM3110ABR330R 3.3V

PAM3110BBA330R 3.3V

PAM3110ALA330R 3.3V

PAM3110BLA330R 3.3V

PAM3110AMB330R 3.3V

PAM3110BMB330R 3.3V

PAM3110ABA500R 5.0V

PAM3110BBA500R 5.0V

PAM3110ALA500R 5.0V

PAM3110BLA500R 5.0V

PAM3110AMB500R 5.0V

PAM3110BMB500R 5.0V

P3110G AXXYW

P3110G BXXYW

P3110G AXXYW

P3110G BXXYW

P3110G AXXYW

P3110G BXXYW

P3110K AXXYW

P3110K BXXYW

P3110K AXXYW

P3110K BXXYW

P3110K AXXYW

P3110K BXXYW

P3110L AXXYW

P3110L BXXYW

P3110L AXXYW

P3110L BXXYW

P3110L AXXYW

P3110L BXXYW

SOT-223 2500 Units/Tape&Reel

TO-252 2500 Units/Tape&Reel

TO-263-2L 800 Units/Tape&Reel

SOT-223 2500 Units/Tape&Reel

TO-252 2500 Units/Tape&Reel

TO-263-2L 800 Units/Tape&Reel

SOT-223 2500 Units/Tape&Reel

TO-252 2500 Units/Tape&Reel

TO-263-2L 800 Units/Tape&Reel

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Marking Information

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PAM3110

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Package Outline Dimensions (All dimensions in mm.)

SOT-223

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PAM3110

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Package Outline Dimensions (cont.) (All dimensions in mm.)

TO-252

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PAM3110

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PAM3110

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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IMPORTANT NOTICE

LIFE SUPPORT

PAM3110

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Diodes PAM3110 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual