Diodes PAM3112 User Manual

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Description

The PAM3112 regulator features low quiescent current (65µA Typ)

and excellent line/load regulation, making it ideal for battery powered

applications. The output voltage can be 1.2V or 1.3V. Space-saving

packages SOT23, TSOT25, SOT-89 and SC70 are attractive for

portable and handheld applications. It has both thermal shutdown and

a current limit features to prevent device failure under extreme

operating conditions. The device is stable with an output capacitance

of 2.2µF or greater.

Features

• Accuracy within ±2%

• Quiescent Current: 65µA Typ.

• Excellent Line/Load Regulation

• Guaranteed 300mA Output Current

• Fast Response

• Current Limiting

• Short Circuit Protection

• Low Temperature Coefficient

• Thermal Shutdown

• Space Saving Package: SOT23, TSOT25, SOT-89 and SC70

• Pb-Free Package

Applications

Pin Assignments

Top View

SOT23

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PAM3112

300mA CMOS LINEAR REGULATOR

Top View

TSOT25

• Cordless Phone

• Cellular Phone

• Bluetooth Earphone

• Digital Camera

• Portable Electronics

• WLAN

• MP3 Player

Typical Applications Circuit

PAM3112

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Pin Configuration and Description

Package

Type

SOT23

TSOT25 VIN GND EN BYP VOUT

SOT89-3

SC70-3L VIN VOUT GND —

SC70-4L EN GND VOUT VIN

SC70-5L VIN GND EN BYP VOUT

Pin Name Function

VIN Input

GND Ground

EN Chip Enable (active high)

BYP Bypass Pin, need a 10nF capacitor connect to GND

VOUT Output

1 2 3 4 5

VOUT GND VIN — —

GND VOUT VIN — —

GND VIN VOUT — —

VOUT GND VIN — —

Pin Number

Functional Block Diagram

PAM3112

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PAM3112

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 6.0 V

Output Current

Output Pin Voltage

Lead Soldering Temperature 300, (5sec) °C

Maximum Junction Temperature 150 °C

Storage Temperature -65 to +150 °C

ESD Rating Class B —

Recommended Operating Conditions (@T

Parameter Rating Unit

Junction Temperature -40 to +125

Ambient Temperature -40 to +85

= +25°C, unless otherwise specified.)

A

P

/(VIN – VO)

D

GND -0.3 to V

+0.3V

IN

= +25°C, unless otherwise specified.)

A

—

V

°C

Thermal Information

Parameter Symbol Package Max Unit

SOT23/

Thermal Resistance (Junction to Case)

Thermal Resistance (Junction to Ambient)

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

PAM3112

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θ

JC

θ

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TSOT25

SOT-89 45

SC70 TBD

SOT23/

TSOT25

SOT-89 160

SC70 300

SOT23/

TSOT25

SOT-89 550

SC70 300

130

250

400

°C/W

mW

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PAM3112

Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

Input Voltage

Output Voltage Accuracy

Output Current

Ground Current

Quiescent Current

Line Regulation LNR

Load Regulation LDR

Short Circuit Current

Temperature Coefficient

Over Temperature Shutdown OTS

Over Temperature Hysteresis OTH

Power Supply Ripple Rejection PSRR

Output Noise

EN Input High Threshold

EN Input Low Threshold

Shutdown Current

Notes: 1. Output current is limited by PD, maximum IO = 400mW/ (V

PAM3112

Document number: DSxxxxx Rev. 2 - 3

V

I

GND

I

V

I

= +25°C, VIN = 3V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.)

A

IN

IO = 1mA

O

300 Note 1 mA

I

O

IO = 1mA to 300mA

I

IO = 0mA

Q

V

= 2.5V to 5.0V IO = 10mA

IN

I

= 1mA to 300mA

O

VO = 0V

SC

T

V

40 ppm/°C

C

I

= 1mA

O

I

= 1mA

O

I

= 100mA

O

= 10nF

C

BYP

f = 10Hz to 100kHz, C

N

VIN = 2.5V to 5V

IN

VIN = 2.5V to 5V

IL

VEN = 0V

SD

IN(MAX)

BYP

– V

= 10nF

O

f = 100Hz 70

f = 1kHz 65

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2.5 5.5 V

-2 +2 %

70 90 µA

65 90 µA

-0.15 0.10 0.15 %/V

30 60 mV

130 mA

150 °C

30 °C

dB

50

µV

RMS

1.5 V

0.3 V

0.01 1 µA

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Typical Performance Characteristics (@T

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PAM3112

= +25°C, CIN = 1µF, CO = 2.2µF, VO = 1.2V, unless otherwise specified.)

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PAM3112

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Typical Performance Characteristics (cont.) (@T

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PAM3112

= +25°C, CIN = 1µF, CO = 2.2µF, VO = 1.2V, unless otherwise specified.)

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PAM3112

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Application Information

Capacitor Selection and Regulator Stability

Similar to any low dropout regulator, the external capacitors used with the PAM3112 must be carefully selected for regulator stability and

performance.

A capacitor C

the distance between C

Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response.

The PAM3112 is designed specifically to work with low ESR ceramic output capacitors in order to save space and improve performance. Using

an output ceramic capacitor whose value is >2.2µF with ESR>5mΩ ensures stability.

A 10nF bypass capacitor connected to BYP pin is suggested for suppressing output noise. The capacitor, in series connection with an internal

200kΩ resistor, forms a low-pass filter for noise reduction. Increasing the capacitance will slightly decrease the output noise, but increase the

startup time.

Load Transient Consideration

Curve 7 of the PAM3112 load-transient response on page 6 shows two components of the output response, a DC shift from the output

impedance due to the load current change and transient response. The DC shift is quite small due to excellent load regulation of the PAM3112.

The transient spike, resulting from a step change in the load current from 1mA to 300mA, is 20mV. The ESR of the output capacitor is critical to

the transient spike. A larger capacitance along with smaller ESR results in a smaller spike.

Shutdown Input Operation

The PAM3112 is shut down by pulling the EN input low and turned on by tying the EN input to VIN or leaving the EN input floating.

Internal P-Channel Pass Transistor

The PAM3112 features a 0.75Ω P-Channel MOSFET device as a pass transistor. The P-MOS pass transistor enables the PAM3112 to consume

only 65µA of ground current during low dropout, light-load, or heavy-load operation. These features increase the battery operation life time.

Input-Output (Dropout) Voltage

A regulator's minimum input-output voltage difference (or dropout voltage) determines the lowest usable supply voltage. The PAM3112 has a

typical 300mV dropout voltage. In batterypowered systems, this will determine the useful end-of-life battery voltage.

Current Limit and Short Circuit Protection

The PAM3112 features a current limit, which monitors and controls the gate voltage of the pass transistor. The output current can be limited to

400mA by regulating the gate voltage. The PAM3112 also has a built-in short circuit current limit.

Thermal Considerations

Thermal protection limits power dissipation in the PAM3112. When the junction temperature exceeds +150°C, the OTP (Over Temperature

Protection) starts the thermal shutdown and turns the pass transistor off. The pass transistor resumes operation after the junction temperature

drops below +120°C.

For continuous operation, the junction temperature should be maintained below +125°C.

The power dissipation is defined as:

of more than 1µF can be used at the PAM3112 input pin, while there is no upper limit for the capacitance of CIN. Please note that

IN

and the input pin of the PAM3112 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3112.

IN

()

VVP

+−=

*

VI

*

I

GNDINOOUTIND

The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surrounding airflow and temperature

difference between junction and ambient. The maximum power dissipation can be calculated by the following formula:

PAM3112

Document number: DSxxxxx Rev. 2 - 3

−=

/

θ

TTP

A)MAX(J)MAX(D

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Application Information

Thermal Considerations

Where T

junction to the ambient.

For example, as θ

the maximum power dissipation at T

is the maximum allowable junction temperature +125°C, TA is the ambient temperature and is the thermal resistance from the

J(MAX)

is 250°C/W for the SOT23 and TSOT25 packages based on the standard JEDEC 51-3 for a single-layer thermal test board,

JA

A

P

)MAX(D

(cont.)

= +25°C can be calculated by following formula:

W4.0250/C25C125

=°−°= SOT-23

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PAM3112

It is also useful to calculate the junction temperature of the PAM3112 under a set of specific condition. Suppose the input voltage V

output current I

defined as:

And the junction temperature, T

T

= 40°C +78.75°C

= 118.75°C<T

For this application, T

configuration.

=150mA and the case temperature TA = +40°C measured by a thermal couple during operation, the power dissipation is

O

()

P

D

can be calculated as follows:

J

= TA + PD*θJA

J

= 40°C +0.35W*250°C/W

J

= +125°C

J(MAX)

is lower than the absolute maximum operating junction temperature +125°C, so it is safe to use the PAM3112 in this

J

mW315A70*V3.3mA150*V2.1V3.3

≅μ+−=

=3.3V, the

IN

PAM3112

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Ordering Information

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PAM3112

Output

Voltage

A Type:

B Type:

D Type:

Configuration

1. VOUT

2. GND

3. VIN

1. GND

2. VOUT

3. VIN

1. VIN

2.GND

3.EN

4.BYP

F Type:

G Type:

H Type:

1. EN

2. GND

3. VOUT

4. VIN

1. VIN

2. VOUT

3. GND

1. GND

2. VIN

3. VOUT

Package

Type

A: SOT23/TSOT25 C: SOT-89 U: SC70

Number of

Pins

A: 3 K: 4 B: 5 F: 6

120: 1.2V 130: 1.3V

5.VOUT

Part Number Output Voltage Marking Package Type Standard Package

PAM3112AAA120 1.2V AOBYW SOT23 3000 Units/ Tape&Reel

PAM3112BAA120 1.2V AOBYW SOT23 3000 Units/ Tape&Reel

PAM3112DAB120 1.2V AOBYW TSOT25 3000 Units/ Tape&Reel

PAM3112ACA120 1.2V

PAM3112HCA120 1.2V

PAM3112GUA120 1.2V AOBYW SC70-3 3000 Units/ Tape&Reel

PAM3112FUK120 1.2V AOBYW SC70-4 3000 Units/ Tape&Reel

PAM3112DUB120 1.2V AOBYW SC70-5 3000 Units/ Tape&Reel

PAM3112AAA130 1.3V AOWYW SOT23 3000 Units/ Tape&Reel

PAM3112BAA130 1.3V AOWYW SOT23 3000 Units/ Tape&Reel

PAM3112DAB130 1.3V AOWYW TSOT25 3000 Units/ Tape&Reel

PAM3112ACA130 1.3V

PAM3112HCA130 1.3V

PAM3112GUA130 1.3V AOWYW SC70-3 3000 Units/ Tape&Reel

PAM3112FUK130 1.3V AOWYW SC70-4 3000 Units/ Tape&Reel

PAM3112DUB130 1.3V AOWYW SC70-5 3000 Units/ Tape&Reel

PAM3112

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P3112B XXXYW

P3112W

XXXYW

P3112W

XXXYW

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SOT89-3 1000 Units/ Tape&Reel

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Marking Information

Top View

SOT23

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PAM3112

Top View

TSOT25

PAM3112

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Package Outline Dimensions (All dimensions in mm.)

SOT23

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PAM3112

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

TSOT25

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PAM3112

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

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

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

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

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IMPORTANT NOTICE

LIFE SUPPORT

PAM3112

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