Diodes PAM3108 User Manual

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f

Description

The PAM3108 is a high performance positive voltage regulator

designed for use in applications requiring very low Input voltage and

very low dropout voltage at up to 1.5A. It operates with a V

as 1.1V and V

as 0.8V. The significant feature includes ultra low dropout, ideal for

applications where V

enable pin to further reduce power dissipation while shutdown. The

PAM3108 provides excellent regulation over variations in line, load,

temperature and provides a power OK signal to indicate if the voltage

level of Vo reaches 90% of its rating value.

The PAM3108 is available with SOP-8 (Exposed Pad) and WDFN-

10L 3x3 packages.

voltage 3V with output voltage programmable as low

DD

is very close to VIN. Additionally, there is an

OUT

as low

IN

Features

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Diodes Incorporated

PAM3108

MAXIMUM 1.5A, ULTRA LOW DROPOUT REGULATOR

Pin Assignments

• Maximum 1.5A Low-Dropout Voltage Regulator

• High Accuracy Output Voltage ±1.5%

• Typically 150mV Dropout at 1.5A

• Power Good Output

• Output Voltage Pull Low Resistance when Disabled

• Thermal and Over Current Protection

• RoHS Compliant and 100% Lead (Pb)-Free

Typical Applications Circuit

Applications

• Front Side Bus VTT (1.2V/1.5A)

• NoteBook PC Applications

• Motherboard Applications

= 0.8V*(1+R1/R2)

V

O

PAM3108

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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

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Diodes Incorporated

PAM3108

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.

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PAM3108

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PAM3108

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 VIN, CTRL 6.0 V

Output Current 1.5 A

Output Pin Voltage

Lead Soldering Temperature 260, (5sec) °C

Storage Temperature -65 to +150 °C

ESD Rating Class B —

Recommended Operating Conditions (@T

Parameter Rating Unit

Max. Supply Voltage 5.5 V

Junction Temperature -40 to +125

Operation Temperature -40 to +85

= +25°C, unless otherwise specified.)

A

GND -0.3 to V

+0.3

IN

= +25°C, unless otherwise specified.)

A

V

°C

Thermal Information

Parameter Symbol Package Max Unit

Thermal Resistance Junction to Case)

Thermal Resistance (Junction to Ambient)

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

θ

JC

JA

W-DFN3x3-10 8.5

SOP-8(EP) 11

W-DFN3x3-10 60

SOP-8(EP) 90

W-DFN3x3-10 1600

SOP-8(EP) 1100

°C/W

mW

PAM3108

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PAM3108

Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

VIN Input Voltage

CTRL Input Voltage

POR Threshold

POR Hysteresis

Quiescent Current

CTRL Input Current in Shutdown

Output Voltage Accuracy

Current Limit

Short Current

Feedback Voltage

Feedback Leakage Current

Dropout Voltage

Line Regulation LNR

Load Regulation LDR

VOUT Pull Low Resistor

Temperature Coefficient

Over Temperature Shutdown OTS

Over Temperature Hysteresis OTH

Power Supply Ripple Rejection PSRR

EN Bias Current

EN Input High Threshold

EN Input Low Threshold

POK Threshold Voltage

POK Hysteresis 3 10 %

POK Pull_Low Voltage POK sinks 5mA Current 0.2 0.4 V

POK Delay Time

Notes: 1. Output current is limited by PD, maximum IO = PD/(V

PAM3108

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V

= +25°C, VIN = VO +0.5V, V

A

V

IN

V

CTRL

V

I

TH_CTRL

TH_VIN

YHS_CTRL

YHS_VIN

I

IO = 0mA

Q

VEN = 0V

SD_CTRL

I

VEN = 0V

SD_VIN

V

IO = 1mA to 1.5A

O

I

O

I

VO = 0V

SHORT

V

VO = V

REF

I

REF

V

DROP

R

VEN = 0V

PL

T

IO = 1mA

C

I

VEN = VCTRL = 5V

EN

V

VIN = 2.5V to 5V

IH

V

VIN = 2.5V to 5V

IL

V

TH_OK

T

From V

DELAY

= V

OUT

3 A

20 nA

= 1A

I

O

IO = 1.5A

I

= 1mA, VIN = VO =0.5V to 5.5V

O

V

= VO +1V, IO = 1mA to 1.5A

IN

I

= 1mA

O

I

= 1mA

O

V

= 200mV

PP

Rising

REF

= V

REF

TY_OK

– VO).

IN(MAX)

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

CTRL

1.1 5.5 V

3 5.5 V

2.5 2.7

0.8 0.9

0.4

0.5

0.5 1.2 mA

5 µA

1 µA

-1.5 1.5 %

1 A

0.788 0.8 0.812 V

100

150

-0.15 0.1 0.15 %/V

-2.0 +0.2 +2.0 %

100 Ω

40 ppm/°C

170 °C

40 °C

f = 100Hz 65

f = 1kHz 60

5 µA

1.5 V

0.3 V

90 94 %

to rising edge of the V

POK

1 2 4 mS

V

mV

dB

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