AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

1 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Synchronous PWM DC-DC Controller in an 8-Pin
Package

Operating with single 5V or 12V supply voltage

Internal 200KHz Oscillator (400KHz for AP2014A)

Soft-Start Function

Fixed Frequency Voltage Mode

500mA Peak Output Drive Capability

Output protected when control FET is shorted

SOP-8L Pb-Free and Green (under development)
packages

The AP2014 PWM DC-DC controller IC is designed to provide a
low cost synchronous Buck regulator for on-board DC to DC
converter applications. With the migration of today's ASIC
products requiring low supply voltages such as 1.8V and lower,
together with currents in excess of 3A, traditional linear regulators
are simply too lossy to be used when input supply is 5V or even
in some cases with 3.3V input supply. The AP2014 together with
dual N-channel MOSFETs such as AF9410, provide a low cost
solution for such applications. This device features an internal
200KHz oscillator (400KHz for "A" version), under-voltage
lockout for both Vcc and Vc supplies, an external programmable
soft-start function as well as output under-voltage detection that
latches off the device when an output short is detected.

Graphic Card

Hard Disk Drive

DDR memory source sink Vtt application

Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V

SOP-8L

2
3
4

(Top View)

Vcc

GND

AP2014/A

LDrv

HDrv

Comp

Features

General Description

Applications

Pin Assignments

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

2 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Ordering Information

AP2014A X X X

Package

Packing

SM: SOP-8L

Blank : Tube or bulk

-7/-13 : Taping

Lead-Free

Blank : Lead-Free
G : Green

Frequency

Blank : 200KHz
A : 400KHz

Pin Descriptions

Pin

Name

Pin

No.

Description

FB 1

This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.

Vcc 2

This pin provides biasing for the internal blocks of the IC as well as power for the low side
driver. A minimum of 1uF, high frequency capacitor must be connected from this pin to
ground to provide peak drive current capability.

LDrv

Output driver for the synchronous power MOSFET.

GND 4

This pin serves as the ground pin and must be connected directly to the ground plane. A
high frequency capacitor (0.1 to 1uF) must be connected from V5 and V12 pins to this pin
for noise free operation.

HDrv

Output driver for the high side power MOSFET.

Vc 6

This pin is connected to a voltage that must be at least 4V higher than the bus voltage of the
switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A
minimum of 1uF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.

Comp 7

Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.

SS 8

This pin provides soft-start for the switching regulator. An internal current source charges
an external capacitor that is connected from this pin to ground which ramps up the output of
the switching regulator, preventing it from overshooting as well as limiting the input current.
The converter can be shutdown by pulling this pin below 0.5V.

7" Tape and Reel

13" Tape and Reel

Device

Package

Code

Packaging

Quantity

Part Number

Suffix

Quantity

Part Number

Suffix

AP2014SM SM SOP-8L

3000/Tape & Reel

-7

10,000/Tape &

Reel

-13

AP2014ASM SM SOP-8L

3000/Tape & Reel

-7

10,000/Tape &

Reel

-13

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

3 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Block Diagram

Comp

GND

LDrv

Vcc

HDrv

25K

1.25V

POR

20uA

64uA

Max

Error Amp

Oscillator

Error Comp

Reset Dom

Bias

Generator

Vcc

4.0V

3.5V

0.2V

3V
1.25V

POR

FbLo Comp

0.5V

POR

Absolute Maximum Ratings

Symbol

Parameter

Range.

Unit

Vcc Supply Voltage

Vc Supply Voltage (not rated for inductive load)

Storage Temperature Range

-65 to 150

Operating Junction Temperature Range

0 to 125

Thermal Resistance Junction to Case

C/W

Thermal Resistance Junction to Ambient

250

C/W

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

4 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Electrical Characteristics

Unless otherwise specified, these specifications apply over V

=5V, V

=12V and T

=0 to 70°C. Typical values refer to T

=25°C. Low

duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Reference Voltage

AP2014 1.225

1.25

1.275

Voltage

AP2014A 0.784

0.8

0.816

REG

FB Voltage Line Regulation

5 < Vcc < 12

0.2

0.35

UVLO

UVLO Threshold - V

4.0 4.2 4.4 V

UVLO V

UVLO Hysteresis - V

Supply Ramping Up

- 0.25 - V

UVLO Threshold - V

3.1 3.3 3.5 V

UVLO V

UVLO Hysteresis - V

Supply Ramping Up

- 0.2 - V

FB Ramping Down
(AP2014)

0.4 0.6 0.8 V

UVLO Threshold - FB

FB Ramping Down
(AP2014A)

0.3 0.4 0.5 V

UVLO FB

UVLO Hysteresis - FB

0.1

Supply Current

Operation I

Operation Supply Current

Freq=200KHz,
C

=1500pF

- 7 10

Operation I

Operation Supply Current

Freq=200KHz,
C

=1500pF

- 7 10

CCQ

Static Supply Current

SS=0V

3.3

Static Supply Current

SS=0V

4.5

Soft-Start Section

Charge

Current

SS=0V

10 20 30 µA

Error Amp

FB1

FB Voltage Input Bias Current

SS=3V,

FB=1V

- -0.1 - µA

FB2

FB Voltage Input Bias Current

SS=0V,

FB=1V

- -64 - µA

gm Transconductance

450 600 750

µmho

Oscillator

AP2014

170 200 230 KHz

Freq Frequency

AP2014A

340 400 460 KHz

RAMP

Ramp-Amplitude

Voltage

1.225

1.25

1.275 V

Output Drivers

Rise

Time

=1500pF

100

Fall

Time

=1500pF

100

Dead Band Time

150

250

Max Duty Cycle

FB=1V, Freq=200KHz

OFF

Min Duty Cycle

FB=1.5V

Function Description

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

5 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Introduction

The AP2014 is a fixed frequency, voltage mode synchronous
controller and consists of a precision reference voltage, an error
amplifier, an internal oscillator, a PWM comparator, 0.5A peak
gate driver, soft-start and shutdown circuits (see Block Diagram).

The output voltage of the synchronous converter is set and
controlled by the output of the error amplifier; this is the amplified
error signal from the sensed output voltage and the reference
voltage.

This voltage is compared to a fixed frequency linear sawtooth
ramp and generates fixed frequency pulses of variable duty-cycle,
which drives the two N-channel external MOSFETs.The timing of
the IC is provided through an internal oscillator circuit which uses
on-chip capacitor to set the oscillation frequency to 200 KHz (400
KHz for "A" version).

Soft-Start

The AP2014 has a programmable soft-start to control the output
voltage rise and limit the current surge at the start-up. To ensure
correct start-up, the soft-start sequence initiates when the V

and

rise above their threshold (3.3V and 4.2V respectively) and

generates the Power On Reset (POR) signal. Soft-start function
operates by sourcing an internal current to charge an external
capacitor to about 3V. Initially, the soft-start function clamps the
E/A's output of the PWM converter. As the charging voltage of
the external capacitor ramps up, the PWM signals increase from
zero to the point the feedback loop takes control.

The outputs are protected against the short circuit. The AP2014
protects the circuit for shorted output by sensing the output
voltage (through the external resistor divider). The AP2014 shuts
down the PWM signals, when the output voltage drops below
0.6V (0.4V for AP2014A).

The AP2014 also protects the output from over-voltaging when
the control FET is shorted. This is done by turning on the sync
FET with the maximum duty cycle.

Under-Voltage Lockout

The under-voltage lockout circuit assures that the MOSFET
driver outputs remain in the off state whenever the supply voltage
drops below set parameters. Lockout occurs if V

and V

fall

below 3.3V and 4.2V respectively. Normal operation resumes
once V

and V

rise above the set values.

IC Quiescent Power Dissipation

Power dissipation for PWM DC-DC controller IC is a function of
applied voltage, gate driver loads and switching frequency. The
IC's maximum power dissipation occurs when the IC operating
with single 12V supply voltage (Vcc=12V and Vc

24V) at 400KHz

switching frequency and maximum gate loads. Page 8 show
voltage vs. current, when the gate drivers loaded with 1500pF
capacitors. The IC's power dissipation results to an excessive
temperature rise. This should be considered when using
AP2014A for such application.

Typical Application Circuit

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

6 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

(1)

10nF

AF9410N

C17

0.1u

VIN=5V

C12

470u

Vc=12V

470u

Vout +1.5V/7.0A

AF9410N

5.6u/9.0

22k

AP2014

C13

470u

C20

100p

0.47u

8.2

0.1u

3.3K

C11

0.1u

820

Vcc

LDrv

GND HDrv

Comp

(2)

Vout +1.5V/7.0A

0.47u

8.2

C13

470u

0.1uF

470u

1N4148

3.3K

C11

0.1u

AP2014

Vcc

LDrv

GND HDrv

Comp

C12

470u

820

AF9410N

6.8k

VIN=12V

C20

100p

Option

0.1u

10nF

AF9410N

C17

0.1u

1N4148

100u

5.6u/9A

Single Supply 12V Input

Typical Application Circuit (Continued)

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

7 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

(3)

Vout +5V/5.0A

0.47u

8.2

C13

470u

0.1uF

470u

1N4148

C11

0.1u

AP2014

Vcc

LDrv

GND HDrv

Comp

10K

AF4910N-1

39k

VIN=12V

C20

100p

0.1u

10nF

AF4910N-2

C17

0.1u

1N4148

100u

10uH/6A

Single Supply 12V Input

(4)

Vout +5V/4.0A

0.47u

8.2

C13

470u

0.1uF

470u

1N4148

3.3K

C11

0.1u

AP2014

Vcc

LDrv

GND HDrv

Comp

10K

Q1-1

AF4928N-1

47k

VIN=24V

C20

100p

0.1u

10nF

Q1-2

AF4928N-2

C17

0.1u

1N4148

100u

10uH/6A

1.2K

RZD

8.2

6.2V

(

15mA)=(VIN-V

-V

)/RZD

Single Supply 24V Input

Typical Application Circuit (Continued)

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

8 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

(5) Dual Supply, 5V Bus and 12V Bias Input

Comp

GND

LDrv

Vcc

HDrv

AP2014

0.1uF

10nF

3.3K

AF9410

10uH

100uF

1uH

47uF

1.8V/1A

2.5V/2A

0.1uF

AP1187

12V

Comp

GND

LDrv

Vcc

HDrv

AP2014

C13

0.1uF

C14

10nF

3.3K

1.65K

AF9410

C11

3.3V/1.8A

C12

220uF

0.1uF

1uF

47uF

C10
1uF

10uH

AF9410

220uF

Dual Supply, 5V Bus and 12V Bias Input

Typical Performance Characteristics

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

9 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Load Regulation

0.0%

0.2%

0.4%

0.6%

0.8%

1.0%

1.2%

1.4%

1.6%

1.8%

2.0%

0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0

Iout(A)

l
a

t
i
o

(
%

)

Efficiency vs. Iout

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0

Iout(A)

Efficiency (%)

Line Regulation

1.240

1.245

1.250

1.255

1.260

4.5

5.0

7.0

9.0

11.0 12.0 15.0

Vin(V)

c
k
V

l
t
a

(

)

Line Regulation

2.500

2.505

2.510

2.515

2.520

2.525

2.530

4.5 5.0 7.0 9.0 11.0 12.0 15.0

Vin(V)

t
put

l
t
age (

)

Frequency v.s. Vin

175.0

180.0

185.0

190.0

195.0

200.0

205.0

210.0

4.5 5.0

7.0

9.0 11.0 12.0 15.0

Vin(V)

r
eq

c
y
(

z
)

Frequency v.s. Temperature

150.0

160.0

170.0

180.0

190.0

200.0

210.0

220.0

230.0

240.0

-40 -20

100 125

Temperature (

r
eq

y
(

)

Typical Performance Characteristics (Continued)

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

10 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Icc and Iccq vs. Vin

3.00

5.00

7.00

9.00

11.00

13.00

15.00

4.5

Vin(V)

Icc and Iccq (mA)

Icc(mA)
Iccq(mA)

Ic and Icq vs. Vin

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

4.5

Vin(V)

Ic and Icq (mA)

Ic(mA)
Icq(mA)

Icc and Ic vs. Temperature

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

-40

-20

100 125

Temperature (

Icc and Ic (mA)

Icc(mA)
Ic(mA)

Vfb vs. Temperature

1.20

1.22

1.24

1.26

1.28

1.30

-40 -20

100 125

Temperature (

eedback Voltage (V)

AP2014A Ic and Icc vs Vc

3.0

5.0

7.0

9.0

11.0

13.0

15.0

17.0

19.0

21.0

10 12 14 16 18 20 22 24

Vc(V)

Ic(mA)
Icc(mA)

AP2014 Ic and Icc vs Vc

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

10 12 14 16 18 20 22 24

Vc(V)

Ic(mA)
Icc(mA)

Typical Performance Characteristics (Continued)

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

11 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

Vout Ripple

Vcc=5V; Vc=12V; Vout=2.5V

Iout=0.5A, Vripple=30.8mV

Vout Ripple

Vcc=5V; Vc=12V; Vout=2.5V

Iout=5A, Vripple=33.2mV

Dead time v.s. Iout

Vcc=5V, Vc=12V, Vout=2.5V, Iout=0.5A, Temp=28

Dead time = 150ns

Dead time v.s. Iout

Vcc=5V, Vc=12V, Vout=2.5V, Iout=5A , Temp=28

Dead time = 160ns

Dead time = 150ns

Marking Information

Highside GATE

Lowside GATE

Phase

Lowside GATE

Highside GATE

Phase

AP2014/A

SYNCHRONOUS PWM DC-DC BUCK CONTROLLER

DS30883 Rev. 1 - 0

12 of 13

AP2014/A

www.diodes.com

Diodes Incorporated

(1) SOP-8L

AP2014(A)

(Top view)

Y WW

Part Number

Logo

WW: Nth week

Y: Year

Blank : Lead Free
G : Green

Marking Code Table

Device

Package

Marking Code

Date Code

AP2014 SOP-8L

AP2014

YWW

AP2014A SOP-8L

AP2014A

YWW

Date Code Key

Year 2006 2007

2008 2009 2010

2011 2012

2013 2014

2015 2016 2017

Code

T U V W X Y Z A B C D E

Package Information

(All Dimensions in mm)

Package Type: SOP-8L

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: AP2014ASM-7

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: AP2014ASM-7