Diodes AP3409A User Manual

AP3409/A

Document number: DS36789 Rev. 2 - 2

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© Diodes Incorporated

AP3409/A

A Product Line of

Diodes Incorporated

Description

The AP3409/A is a current mode, PWM synchronous buck DC/DC
converter, capable of driving a 3A load with high efficiency, excellent
line and load regulation. It operates in continuous PWM mode.

The AP3409/A integrates synchronous P-channel and N-channel
power MOSFET switches with low on-resistance. It is ideal for
portable applications powered from a single Li-ion battery. 100% duty
cycle and low on-resistance P-channel internal power MOSFET can
maximize the battery life.

The switching frequency of AP3409/A can be programmable from
300kHz to 4MHz, which allows small-sized components, such as
capacitors and inductors. A standard series of inductors from several
different manufacturers are available. This feature greatly simplifies
the design of switch-mode power supplies.

The AP3409/A is available in U-DFN3030-10 package.

Features

 Input Voltage Range: 2.6V to 5.5V
 Adjustable Output from 0.8V to 5V
 0.8V Reference Voltage with ± 2% Precision
 Output Current: 3A
 High Efficiency up to 95%
 Low R

DSON

Internal Switches

 Programmable Frequency: 300kHz to 4MHz
 Current Mode Control
 Forced Continuous-mode Operation
 100% Duty Cycle
 Built-in Soft-start
 Built-in Short Circuit Protection
 Built-in Thermal Shutdown Protection
 Built-in Current Limit Function
 PGOOD Output Voltage Monitoring (For AP3409A)
 U-DFN3030-10 package
 Totally Lead-free & Fully RoHS Compliant (Note 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

U-DFN3030-10 (DN Package)

For AP3409

(Top View)

U-DFN3030-10 (DN Package)

For AP3409A

Applications

 Portable Media Player
 Digital Still and Video Cameras
 Notebook

SHDN/RT

GND

SW
SW

PGND

COMP
FB
VDD
PVDD
PVDD

Pin 1 Mark

1

2

3

4

5 6

7

8

9

10

Exposed Pad
Connected to

PGND

SHDN/RT

GND

SW
SW

PGND

COMP
FB
PGOOD
VDD
PVDD

Pin 1 Mark

1

2

3

4

5 6

7

8

9

10

Exposed Pad
Connected to

PGND

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

3A, 4MHz HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER

AP3409/A

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AP3409/A

A Product Line of

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AP3409

SHDN/RT

GND
SW
PGND

COMP

FB

VDD

PVDD

V

IN

5V

R

OSC

330k

L1 2.0mH

C

IN

22mF

C1
22pF

C

OUT

22mF ×2

R1

510k

R2 240k

C

COMP

1000pF

R

COMP

30k

V

OUT

2.5V/3A

AP3409A

SHDN/RT

GND

SW

PGND

COMP

FB

PGOOD

VDD
(PVDD)

V

IN

5V

R

OSC

330k

L1 2.0mH

C

IN

22mF

C1
22pF

C

OUT

22mF ×2

R1

510k

R2 240k

C

COMP

1000pF

R

COMP

30k

V

OUT

2.5V/3A

R4
100k

2

)21(RRRV

V

FB

OUT





Typical Applications Circuit (Note 4)

Notes 4:

Typical Application of AP3409

Typical Application of AP3409A

AP3409/A

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AP3409/A

A Product Line of

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Pin Number

Pin Name

Function

AP3409

AP3409A

1

1

SHDN/RT

Oscillator resistor input. Connect a resistor to GND from this pin to set the
switching frequency. Forcing this pin to VDD to shutdown the device

2

2

GND

Signal ground. All small-signal ground, such as the compensation
components and exposed pad should be connected to this, which in turn
connects to PGND at one point

3, 4

3, 4

SW

Internal power switch output. Connect this pin with one terminal of the
inductor

5

5

PGND

Power ground. Connect this pin as close as possible to CIN and C

OUT

6, 7

6

PVDD

Power Input Supply. Decouple this pin to PGND with a capacitor

8

7

VDD

Signal input supply. Decouple this pin to GND with a capacitor. Normally
VDD is equal to V

PVDD

–

8

PGOOD

Power good indicator. This pin is open-drain logic output that is pulled to
ground when the output voltage is not within ±12.5% of regulation point

9

9

FB

Feedback voltage. This pin is the inverting input of internal error amplifier.
It senses the converter output voltage through an external resistor
divider. The internal reference voltage is 0.8V, which determines the
output voltage through the resistor divider

10

10

COMP

Compensation input. This pin is the output of internal error amplifier.
Connect external compensation elements to this pin to stabilize the
control loop

SD

Oscillator

SUM

CS

0.8V

EA

OCP

Driver

Control

Logic

OTPUVLO

V

REF

0.4V

SHDN/RT

PVDD

SW

GND

PGND

VDD

FB

COMP

1

2

10

3, 4

5

6, 7

8

9

PWM

Clamp

SS

DC

Pin Descriptions

Functional Block Diagram

Functional Block Diagram of AP3409

AP3409/A

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AP3409/A

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SD

Oscillator

SUM

CS

0.8V

EA

OCP

Driver

Control

Logic

OTPUVLO

0.4V

SHDN/RT

PVDD

SW

GND

PGND

VDD

FB

COMP

1

2

10

3, 4

5

6

7

9

PWM

Clamp

SS

DC

8

PGOOD

V

REF

0.725V

0.9V

Symbol

Parameter

Rating

Unit

VDD

VDD Pin Voltage

-0.3 to 6

V

V

PVDD

PVDD Pin Voltage

-0.3 to 6

V

VFB

FB Pin Voltage

-0.3 to 6

V

V

COMP

COMP Pin Voltage

-0.3 to 6

V

VSW

SW Pin Voltage

-0.3 to VIN+0.3

V

VRT

SHDN/RT Pin Voltage

-0.3 to 6

V

θ

JA

Thermal Resistance (Junction to Ambient)

110

ºC/W

θ

JC

Thermal Resistance (Junction to Case)

3

ºC/W

TJ

Operating Junction Temperature

+150

ºC

T

STG

Storage Temperature

-65 to +150

ºC

T

LEAD

Lead Temperature (Soldering, 10 sec)

+260

ºC

–

ESD (Machine Model)

200 V –

ESD (Human Body Model)

2000

V

Functional Block Diagram (Cont.)

Absolute Maximum Ratings (Note 5)

Note 5: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Functional Block Diagram of AP3409A

AP3409/A

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Symbol

Parameter

Min

Max

Unit

VIN

Input Voltage

2.6

5.5

V

I

OUT (MAX)

Maximum Output Current

3 – A

TJ

Operating Junction Temperature

-40

+125

ºC

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

INPUT SECTION

VDD

Input Voltage Range

2.6 – 5.5

V

IQ

Supply Current

VFB=0.75V,
No Switching

–

460 – µA

I

SHDN

Shutdown Supply Current

Shutdown, VIN=5.5V

– – 1

µA

V

UVLO

Under Voltage Threshold Lockout

VDD Rising

–

2.2 – V

V

HUVLO

Under Voltage Hysteresis Lockout

– – 300 – mV

FEEDBACK SECTION

VFB

Feedback Voltage

–

0.784

0.8

0.816

V

IFB

FB Pin Bias Current

– – 0.1

0.4

µA

RT

Current Sense Trans-resistance

– – 0.2 –

–

Switching Leakage Current

V

SHDN/RT=VIN

=5.5V

– – 1

µA

GV

Error Gain Amplifier Voltage

– – 800 – –

GS

Error Amplifier Trans-conductance

– – 800 – µA/V

OSCILLATOR SECTION

VRT

RT Pin Voltage

–

0.76

0.8

0.84

V

f

OSC

Switching Frequency
R

OSC

0.8 1 1.2

MHz

ADJ Frequency

0.3 – 4

MHz

D

MAX

Maximum Duty Cycle

VFB=0.75V

100 – –

%

POWER SWITCH SECTION

I

LIMIT

Switch Current Limit
AP3409

VFB=0.75V

3.2

4.2 – A

AP3409A

3.5

4.2 – A

R

PDSON

Internal P-FET On Resistance

ISW=500mA

–

0.11

0.16

Ω

R

NDSON

Internal N-FET On Resistance

ISW=-500mA

–

0.11

0.17

Ω

SHDN/RT SECTION

–

Shutdown Threshold

–

–

VDD-0.7

VDD-0.4

V

PGOOD SECTION (Only for AP3409A)

–

PGOOD Voltage Range

– – ±12.5

±15

%

–

PGOOD Pull Down Resistance

– – –

120

Ω

TOTAL DEVICE

I

OUT

Output Current

VDD=2.6V to 5.5V,
V

OUT

=2.5V

3 – – A LNR

Output Voltage Line Regulation

VDD=2.7V to 5.5V,
I

OUT

=100mA

–

0.4 – %/V

LOD

Output Voltage Load Regulation

I

OUT

=0.01A to 3A

–

±0.2 – %

tSS

Soft-start Time

I

OUT

＝10mA

–

1.5 – ms

T

OTSD

Thermal Shutdown Temperature

– – +160 – ºC

T

HYS

Thermal Shutdown Temperature
Hysteresis

– – +20 – ºC

Recommended Operating Conditions

Electrical Characteristics (V

IN=VDD=VPVDD

=3.3V, TA=+25oC, unless otherwise specified.)

AP3409/A

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AP3409/A

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2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

100

200

300

400

500

600

Supply Current

(mA)

Input Voltage (V)

VFB=0.75V

-60 -30 0 30 60 90 120 150

100

200

300

400

500

600

700

Supply Current

(mA)

Ambient Temperature (oC)

VIN=3.3V
VFB=0.75V

0 500 1000 1500 2000 2500 3000 3500

30

40

50

60

70

80

90

100

Efficiency (%)

Output Current (mA)

V

OUT

=2.5V

VIN=5.0V
VIN=3.3V

-60 -30 0 30 60 90 120 150

60

80

100

120

140

PMOS ON Resistance

(m)

Ambient Temperature (OC)

VIN=3.3V
VFB=0.75V

-60 -30 0 30 60 90 120 150

0.7

0.8

0.9

1.0

1.1

1.2

Frequency (MHz)

Ambient Temperature (OC)

VIN=3.3V
V

OUT

=2.5V

-60 -30 0 30 60 90 120 150

60

80

100

120

140

NMOS ON Resistance

(m)

Ambient Temperature (OC)

VIN=3.3V
VFB=0.85V

Performance Characteristics (V

Supply Current vs. Input Voltage Supply Current vs. Ambient Temperature

Efficiency vs. Output Current PMOS ON Resistance vs. Ambient Temperature

NMOS ON Resistance vs. Ambient Temperature Frequency vs. Ambient Temperature

IN=VDD=VPVDD

=3.3V, TA=+25oC, unless otherwise specified.)

AP3409/A

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-60 -30 0 30 60 90 120 150

2

3

4

5

Current Limit (A)

Ambient Temperature (OC)

VIN=3.3V
VFB=0.75V

-60 -30 0 30 60 90 120 150

0.5

0.6

0.7

0.8

0.9

V

FB

(V)

Ambient Temperature (OC)

VIN=3.3V
V

OUT

=2.5V

V

OUT

(AC)

50mV/div

I

OUT

1A/div

Time 200ms/div

VSW

2V/div

V

OUT

2V/div

IL

2A/div

Time 1ms/div

V

OUT

1V/div

I

OUT

1A/div

Time 4ms/div

V

OUT

1V/div

I

OUT

1A/div

Time 4ms/div

Performance Characteristics (Cont. V

VFB vs. Ambient Temperature Current Limit vs. Ambient Temperature

Start-up from VIN (VIN=3.3V, V

OUT

=2.5V, I

(VIN=3.3V, V

Short Circuit Protection (VIN=3.3V, V

OUT

IN=VDD=VPVDD

=3.3V, TA=+25oC, unless otherwise specified.)

=3A) Load Transient Response

OUT

OUT

=2.5V, I

=0.5A to 3A)

OUT

=2.5V) Short Circuit Recovery (VIN=3.3V, V

OUT

=2.5V)

AP3409/A

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AP3409/A

A Product Line of

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AP3409X XX XX - XX

PackingVersion

TR : Tape & Reel

A: AP3409A

G1 : Green

Product Name

RoHS/GreenPackage

DN: U-DFN3030-10

Blank: AP3409

Package

Temperature Range

Part Number

Marking ID

Packing

U-DFN3030-10

-40 to +125C

AP3409DNTR-G1

BDA

5000/Tape & Reel

AP3409ADNTR-G1

BCA

5000/Tape & Reel

First Line: Logo and Marking ID
Second and Third Lines: Date Code
Y: Year
WW: Work Week of Molding
A: Assembly House Code
XX: 7th and 8th Digits of Batch No.

First Line: Logo and Marking ID
Second and Third Lines: Date Code
Y: Year
WW: Work Week of Molding
A: Assembly House Code
XX: 7th and 8th Digits of Batch No.

Ordering Information

Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green.

Marking Information

AP3409 (Top View)

AP3409A (Top View)

AP3409/A

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2.900(0.114)

3.100(0.122)

2.900(0.114)

3.100(0.122)

1.500(0.059)

1.800(0.071)

0.200(0.008)

0.300(0.012)

0.500(0.020)
TYP

0.250(0.010)

0.550(0.022)

0.000(0.000)

0.050(0.002)

2.300(0.090)

2.500(0.098)

N1

N5

N6 N10

Pin 1 Mark

PIN #

1 IDENTIFICATION

See DETAIL A

12

DETAIL A

12

12

Pin 1 options

Symbol

A

min(mm) max(mm) min(inch) max(inch)

Option1
Option2

0.700

0.570

0.800

0.630

0.028

0.022

0.031

0.025

A3

min(mm) max(mm) min(inch) max(inch)

0.153

0.150 (Typ)

0.253 0.006

0.006 (Typ)

0.010

A

A3

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

(1) Package Type: U-DFN3030-10

AP3409/A

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X1

Y1

X2

Y2

Y

E

Dimensions

Y

(mm)/(inch)

X1

(mm)/(inch)

Y1

(mm)/(inch)

X2

(mm)/(inch)

Y2

(mm)/(inch)

E

(mm)/(inch)

Value

3.300/0.130

0.300/0.012

0.600/0.024

2.600/0.102

1.800/0.071

0.500/0.020

Suggested Pad Layout

(1) Package Type: U-DFN3030-10

AP3409/A

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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.

This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.

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.

Copyright © 2012, Diodes Incorporated

www.diodes.com

IMPORTANT NOTICE

LIFE SUPPORT