Diodes AP3513E User Manual

AP3513E

Document number: DS36692 Rev. 2 - 2

1 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

Description

The AP3513E is a 500kHz fixed frequency, current mode, PWM
synchronous buck (step-down) DC-DC converter, capable of driving a
3A load with high efficiency, excellent line and load regulation. The
AP3513E exhibits high efficiency at light load. The device integrates
N-channel power MOSFET switch with low on-resistance. Current
mode control provides fast transient response and cycle-by-cycle
current limit.

The AP3513E employs complete protection to ensure system
security, including output Over Voltage Protection, input Under
Voltage Lock Out, programmable Soft-start, Over Temperature
Protection and hiccup mode Short Circuit Protection.

This IC is available in SO-8EP package.

Features

 Input Voltage Range: 4.5V to 18V
 Fixed 500kHz Frequency
 High Efficiency at Light Load
 Output Current: 3A
 Current Mode Control
 Built-in Over Current Protection
 Built-in Thermal Shutdown Function
 Built-in UVLO Function
 Built-in Over Voltage Protection
 Programmable Soft-start
 Hiccup Mode SCP
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

(SO-8EP/ MP Package)

Applications

 Monitor
 TV
 STB
 Datacom

C

C

C

OUT

22μF*2

L

R

EN

100k

R2

R1

R

C

C

P

Optional

C

BS

10nF

C

SS

0.1μF

3

5

1

6

7

8

2

4

AP3513E

BS

IN

SW

GND

FB

COMP

EN

SS

Input Voltage=12V

Output Voltage=3.3V

C

IN

10μF*2

4.7μH

3.3nF

13k

10k

26.1k

1

2

3

4

8

7

6

5

BS

IN

SW

GND

SS

EN

COMP

FB

EP

18V, 3A SYNCHRONOUS DC-DC BUCK CONVERTER

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.

Typical Applications Circuit

AP3513E

Document number: DS36692 Rev. 2 - 2

2 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

Pin Number

Pin Name

Function

1

BS

Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage
across the bootstrap capacitor drives the internal high-side NMOS switch.

2

IN

Supply input pin. A capacitor should be connected between the IN pin and GND pin to keep the DC
input voltage constant.

3

SW

Power switch output pin. This pin is connected to the inductor and bootstrap capacitor.

4

GND

Ground pin

5

FB

Feedback pin. This pin is connected to an external resistor divider to program the system output
voltage. When the FB pin voltage exceeds 1.1V, the over voltage protection is triggered. When the
FB pin voltage is below 0.3V, the oscillator frequency is lowered to realize short circuit protection.

6

COMP

Compensation pin. This pin is the output of the transconductance error amplifier and the input to the
current comparator. This pin is used to compensate the control loop. Connect a series RC network
from this pin to GND pin. In some cases, an additional capacitor from this pin to GND pin is
required.

7

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn off. Pull up with 100kΩ resistor for automatic startup.

8

SS

Soft-start control input pin. SS controls the soft start period. Connect a capacitor from SS to GND to
set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the soft­start feature, leave SS unconnected.

–

EP

Exposed pad. It should be connected to GND in PCB layout.

S

R

Q
Q

INTERNAL

REGULATOR

OSCILLATOR

2

7

5

4

3

1

VA

BS

SW

GND

EA

6

COMPFB

EN

IN

COMPARATOR

8

SS

CURRENT

SENSE

AMPLIFIER

CLK

SLOP
COMP

PWM

COMPARATOR

1.1V

+

SCP

VA
VB

VB

5µA

180K/500K

0.

925V

2.5V

M1

M2

0.3V

COMPARATOR

1.5V

SHUTDOWN

LOCK

Pin Descriptions

Functional Block Diagram

AP3513E

Document number: DS36692 Rev. 2 - 2

3 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

Symbol

Parameter

Rating

Unit

VIN

IN Pin Voltage

-0.3 to 20

V

VEN

EN Pin Voltage

-0.3 to VIN

V

VSW

SW Pin Voltage

21

V

VBS

BS Pin Voltage

-0.3 to VSW+6

V

VFB

FB Pin Voltage

-0.3 to 6

V

V

COMP

COMP Pin Voltage

-0.3 to 6

V

VSS

SS Pin Voltage

-0.3 to 6

V

TJ

Operating Junction Temperature

+150

ºC

T

STG

Storage Temperature

-65 to +150

ºC

T

LEAD

Lead Temperature (Soldering, 10sec)

+260

ºC

θ

JA

Thermal Resistance (Junction to Ambient)

SO-8EP

60

o

C/W

V

HBM

ESD (Human Body Model)

2000

V

VMM

ESD (Machine Model)

200

V

Symbol

Parameter

Min

Max

Unit

VIN

Input Voltage

4.5

18

V

TA

Operating Ambient Temperature

-40

+85

ºC

Absolute Maximum Ratings (Note 4)

Note 4: 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 Condi tions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

AP3513E

Document number: DS36692 Rev. 2 - 2

4 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

SUPPLY VOLTAGE (IN PIN)

VIN

Input Voltage

–

4.5 – 18

V

IQ

Quiescent Current

V

FB

= 1V, V

EN

= 3.3V

–

1.2

1.4

mA

I

SHDN

Shutdown Supply Current

V

EN

= 0V

–

0.1

1.0

µA

UNDER VOLTAGE LOCKOUT

V

UVLO

Input UVLO Threshold

VIN Rising

3.65

4.0

4.25

V

V

HYS

Input UVLO Hysteresis

– – 0.2 – V

ENABLE (EN PIN)

–

EN Shutdown Threshold Voltage

–

1.1

1.5 2 V

–

EN Shutdown Threshold Voltage Hystere­sis (Note 5)

–

–

350 – mV

–

EN Lockout Threshold Voltage

–

2.2

2.5

2.7 V –

EN Lockout Hysteresis

–

–

210 – mV

VOLTAGE REFERENCE (FB PIN)

VFB

Feedback Voltage

–

0.907

0.925

0.943

V

V

FBOV

Feedback Over Voltage Threshold

– – 1.1 – V

IFB

Feedback Bias Current

V

FB

= 1V

-0.1 – 0.1

µA

MOSFET

R

DSONH

High-side Switch On-resistance (Note 6)

I

SW

= 0.2A&0.7A

–

100 – mΩ

R

DSONL

Low-side Switch On-resistance (Note 6)

I

SW

= -0.2A&-0.7A

–

100 – mΩ

CURRENT LIMIT

I

LEAKH

High-side Switch Leakage Current

V

IN

= 18V, V

EN

= 0V, V

SW

= 0V

–

0.1

10

μA

I

LIMH

High-side Switch Current Limit

–

4.3

5.6 – A

I

LIML

Low-side Switch Current Limit

From drain to source

–

50 – mA

SWITCHING REGULATOR

f

OSC1

Oscillator Frequency

–

410

500

590

kHz

f

OSC2

Short Circuit Oscillator Frequency

– – 180 – kHz

D

MAX

Max. Duty Cycle

V

FB

= 0.85V

–

90 – %

D

MIN

Min. Duty Cycle

V

FB

= 1V

– – 0

%

Electrical Characteristics (V

= V

= 12V, V

IN

EN

OUT

= 3.3V, T

= +25ºC, unless otherwise specified.)

A

AP3513E

Document number: DS36692 Rev. 2 - 2

5 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ERROR AMPLIFIER

AEA

Error Amplifier Voltage Gain (Note 5)

– – 400 – V/V

GEA

Error Amplifier Transconductance

– – 800 – μA/V

GCS

COMP to Current Sense
Transconductance

– – 5.2 – A/V

THERMAL SHUTDOWN

T

OTSD

Thermal Shutdown (Note 5)

– – +160 – ºC

T

HYS

Thermal Shutdown Hysteresis (Note 5)

– – +30 – ºC

SOFT START (SS PIN)

tSS

Soft-start Time (Note 5)

C

SS

= 0.1μF

–

15 – ms

–

Soft-start Current

– – 5 – μA

SW2SW1

SW2SW1

I-I

V-V

Electrical Characteristics (Cont. V

Notes: 5. Not tested, guaranteed by design.

6. R

DSON

=

= V

= 12V, V

IN

EN

OUT

= 3.3V, T

= +25ºC, unless otherwise specified.)

A

AP3513E

Document number: DS36692 Rev. 2 - 2

6 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

0.01 0.1 1

10

20

30

40

50

60

70

80

90

100

Efficiency (%)

Output Current (A)

VIN=12V

V

OUT

=3.3V, L=4.7H

V

OUT

=5.0V, L=6.8H

-50 -25 0 25 50 75 100 125 150

0.80

0.85

0.90

0.95

1.00

1.05

1.10

1.15

1.20

1.25

1.30

Quiescent Current (mA)

Temperature (oC)

-50 -25 0 25 50 75 100 125 150

0.6

0.7

0.8

0.9

1.0

1.1

1.2

Feedback Voltage (V)

Temperature (oC)

VSW

(10V/div)

V

OUT-AC

(20mV/div)
I

L

(1A/div)

V

OUT-AC

(200mV/div)

I

OUT

(1A/div)

V

OUT-AC

(100mV/div)

I

OUT

(1A/div)

Time(1µs/div)

Time(100µs/div)

Time(100µs/div)

Performance Characteristics (V

Efficiency vs. Output Current Quiescent Current vs. Temperature

Feedback Voltage vs. Temperature Output Ripple (I

Load Transient Response (I

= 12V, V

IN

= 0.2A to 2.5A) Load Transient Response (I

OUT

= 3.3V, L = 4.7µH, TA = +25°C, unless otherwise noted.)

OUT

OUT

= 2.5A)

= 1A to 2.5A)

OUT

AP3513E

Document number: DS36692 Rev. 2 - 2

7 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

VIN

(10V/div)

V

OUT

(2V/div)

I

L

(1A/div)

VIN

(10V/div)

V

OUT

(2V/div)

I

L

(1A/div)

VEN

(2V/div)

V

OUT

(2V/div)

I

L

(1A/div)

VEN

(2V/div)

V

OUT

(2V/div)

I

L

(1A/div)

VSS

(2V/div)

V

OUT

(2V/div)

V

SW

(10V/div)

I

L

(2A/div)

VSS

(2V/div)

V

OUT

(2V/div)

V

SW

(10V/div)

I

L

(2A/div)

Time(3.20ms/div)

Time(3.20ms/div)

Time(3.20ms/div)

Time(3.20ms/div)

Time(64ms/div)

Time(64ms/div)

Performance Characteristics (Cont. V

Power On from VIN (I

Power On from EN (I

OUT

OUT

Short Circuit Protection (I

= 12V, V

IN

= 3.3V, L = 4.7µH, TA = +25°C, unless otherwise noted.)

OUT

= 2.5A) Power Off from VIN (I

= 2.5A) Power Off from EN (I

= 2.5A) Short Circuit Protection Recovery (I

OUT

OUT

OUT

= 2.5A)

= 2.5A)

OUT

= 2.5A)

AP3513E

Document number: DS36692 Rev. 2 - 2

8 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

AP3513E XX XX - XX

PackingPackageProduct Name RoHS/Green

TR : Tape & Reel

Blank : TubeMP : SO-8EP

G1 : Green

Package

Temperature

Range

Part Number

Marking ID

Packing

SO-8EP

-40 to +85C

AP3513EMP-G1

3513EMP-G1

100/Tube

AP3513EMPTR-G1

3513EMP-G1

4000/Tape & Reel

(Top View)

First and Second Lines: Logo and Marking ID
Third Line: Date Code
Y: Year
WW: Work Week of Molding
4: Assembly Site Code
XX: 7th and 8th digits of Batch Number

3513E
MP-G1
YWW4XX

Ordering Information

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

Marking Information

(1) SO-8EP

AP3513E

Document number: DS36692 Rev. 2 - 2

9 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

8

°

5.800(0.228)

6.200(0.244)

1.270(0.050)

0.400(0.016)

3.800(0.150)

4.000(0.157)

0.510(0.020)

0.050(0.002)

0.150(0.006)

4.700(0.185)

1.270(0.050)
TYP

0

°

0.250(0.010)

0.150(0.006)

1.350(0.053)

1.550(0.061)

2.110(0.083)

2.710(0.107)

2.750(0.108)

3.402(0.134)

5.100(0.201)

Note: Eject hole, oriented hole and mold mark is optional.

0.300(0.012)

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

(1) Package Type: SO-8EP

AP3513E

Document number: DS36692 Rev. 2 - 2

10 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

G

E

X

X1

Y

Y1

Z

Dimensions

Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

Y

(mm)/(inch)

Value

6.900/0.272

3.900/0.154

0.650/0.026

1.500/0.059

Dimensions

X1

(mm)/(inch)

Y1

(mm)/(inch)

E

(mm)/(inch)

---

Value

3.600/0.142

2.700/0.106

1.270/0.050

---

Suggested Pad Layout

(1) Package Type: SO-8EP

AP3513E

Document number: DS36692 Rev. 2 - 2

11 of 11

www.diodes.com

January 2014

© Diodes Incorporated

AP3513E

A Product Line of

Diodes Incorporated

NE W P R OD UC T

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