Diodes PAM2306 User Manual

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DUAL HIGH-EFFICIENCY PWM STEP-DOWN DC-DC CONVERTER

Description

The PAM2306 is a dual step-down current-mode, DC-DC converter.

At heavy load, the constant frequency PWM control provides

excellent stability and transient response. To ensure the longest

battery life in portable applications, the PAM2306 provides a power -

saving Pulse-Skipping Modulation (PSM) mode to reduce quiescent

current under light load operation.

The PAM2306 supports a range of input voltages from 2.5V to 5.5V,

allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH

cell, USB, and other standard power sources. The dual output

voltages are available for 3.3V, 2.8V, 2.5V, 1.8V, 1.5V, 1.2V or

adjustable. All versions employ internal power switch and

synchronous rectifier to minimize external part count and realize high

efficiency. During shutdown, the input is disconnected from the output

and the shutdown current is less than 0.1A. Other key features

include under-voltage lockout to prevent deep battery discharge.

Features

Pin Assignments

Applications

Product Line o

Diodes Incorporated

PAM2306

 Efficiency up to 96%  Only 40μA (typ per channel) Quiescent Current  Output Current: Up to 1A per Channel  Internal Synchronous Rectifier  1.5MHz Switching Frequency  Soft Start  Under-Voltage Lockout  Short Circuit Protection  Thermal Shutdown  Small 12L WDFN3x3 Package  Pb-Free Package and RoHS Compliant

Typical Applications Circuit

 Cellular Phone  Portable Electronics  Personal Information Appliances  Wireless and DSL Modems  MP3 Players

1Rx







VV

1REFOUT







2Rx





Figure 1. Adjustable Voltage Regulator

PAM2306

Document number: DSxxxxx Rev. 1 - 2

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Typical Applications Circuit

Product Line o

Diodes Incorporated

PAM2306

= 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V

V

OUT

Figure 2. Fixed Voltage Regulator

Pin Descriptions

Pin Number

1 VIN2 Power Input of Channel 2.

2 LX2 Pin for Switching of Channel 2.

3, 9

Exposed Pad

4 FB1 Feedback of Channel 1.

5, 11 NC1, NC2 No Connection

6 EN1

7 VIN1 Power Input of Channel 1.

8 LX1 Pin for Switching of Channel 1.

10 FB2 Feedback of Channel 2.

12 EN2

PAM2306

Document number: DSxxxxx Rev. 1 - 2

Pin Name

WDFN3x3-12L

GND

Function

Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.

Chip Enable of Channel 1 (Active High). V

Chip Enable of Channel 2 (Active High). V

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EN1

EN2

≤ V

IN1

IN2

.

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Functional Block Diagram

Product Line o

Diodes Incorporated

PAM2306

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 -0.3 to +6.5 V

EN1, FB1, LX1, EN2, FB2 and LX2 Pin Voltage

Maximum Junction Temperature 150 °C

Storage Temperature Range -65 to +150 °C

Soldering Temperature 260, 10sec °C

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage 2.5 to 5.5 V

Ambient Temperature Range -40 to +85 °C

Junction Temperature Range -40 to +125 °C

= +25°C, unless otherwise specified.)

A

-0.3 to (V

+0.3)

IN

= +25°C, unless otherwise specified.)

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Thermal Information

Parameter Symbol Package Maximum Unit

Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Case)

Power Dissipation

θ

JA

θ

JC

P

D

WDFN3x3-12

60 °C/W

8.5 °C/W

1.66 W

PAM2306

Document number: DSxxxxx Rev. 1 - 2

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Product Line o

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PAM2306

Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

Input Voltage Range

Regulated Feedback Voltage

Reference Voltage Line Regulation

Regulated Output Voltage Accuracy

Peak Indictor Current

Output Voltage Line Regulation LNR

Output Voltage Load Regulation LDR

Quiescent Current (per channel)

Shutdown Current (per channel)

Oscillator Frequency

Drain-Source On-State Resistance

SW Leakage Current (per channel)

High Efficiency η 96 %

EN Threshold High

EN Threshold Low

EN Leakage Current

Over Temperature Protection OTP 150 °C

OTP Hysteresis OTH 30 °C

PAM2306

Document number: DSxxxxx Rev. 1 - 2

= +25°C, VIN = 3.6V, VO = 1.8V, CIN = 10µF, CO = 10µF, L = 2.2µH, unless otherwise specified.)

A

V

∆V

V

I

f

OSC

R

DS(ON)

I

LSW

V

I

PK

I

SD

EN

IN

FB

O

Q

EH

EL

2.5 5.5 V

0.588 0.6 0.612 V

0.3 %/V

I

= 10mA

O

VIN = 3V, VFB = 0.5V or VO = 90%

V

= 2.5V to 5V, IO = 10mA

IN

I

= 1mA to 1A

O

No load 40 70 µA

VEN = 0V

= 100%

V

O

VFB = 0V or VO = 0V

IDS = 100mA

P MOSFET 0.3 0.45 Ω N MOSFET 0.35 0.5 Ω

±0.01 1 µA

1.5 V

0.3 V

±0.01 µA

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-3 +3 %

1.5 A

0.2 0.5 %/V

0.5 1.5 %

0.1 1 µA

1.2 1.5 1.8 MHz

500 kHz

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Typical Performance Characteristics (@T

Product Line o

Diodes Incorporated

PAM2306

= +25°C, CIN = 10µF, CO = 10µF, L = 4.7µH, unless otherwise specified.)

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PAM2306

Document number: DSxxxxx Rev. 1 - 2

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