Diodes AP6714 User Manual

Description

The AP6714 is fully integrated synchronous current mode
boost converter which provides a complete power supply
solution for all one-cell, two-cell, three cell, alkaline, NiCd or
NiMh or single-cell Lithion battery powered products. They
improve performance, component count and size compared
to conventional controllers, lithium-ion (Li+) designs. On-chip
MOSFETs provide up to 94% efficiency for critical power
supplies. This optimizes overall efficiency and cost, while
also reducing board space. Operate at one fixed freq uency of

1.8MHz to optimize size, cost, and efficiency. Other features
include soft-start and overload protection. AP6714 is
available in space-saving 10-pin MSOP package.

Features

• 94% Efficient Step-Up DC to DC Converter

• Wide Input Range 0.9V to 5.5V

• 1.8V to 5.5V Adjustable Output Voltage

• 1.8MHz Operating Frequency

• Current Mode Operation for faster transient response

and better loop stability

• 1µA Shutdown Mode

• Suitable with Low ESR Ceramic Capacitors (MLCC)

• Over Current Protection

• Over Temperature Protection

• MSOP-10L: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

Pin Assignments

1

Vcc

2

EN

3

CC

4

FB

56

REF

Applications

• All One-cell, Two-cell, Three cell, Alkaline, NiCd or

NiMh or Single-cell Li+ Battery Powered Devices.

• Cell Phones

• Digital Cameras

• MP3 Players

• PDAs

( Top View )

MSOP-10L

10

OUT

LX

9

8

OCP

7

PGND

SGND

Typical Application Circuit (Note 2)

U1

C2

470p

R2

Rcc

1 MOhm

27 KOhm

R

TOP

R

BOTTOM

C3

0.1u

1

2

3

4

5

VCC

EN

CC

FB

REF

AP6714

OUT

OCP

PGND

SGND

10

9

LX

Rocp

8

7

6

L1 2.7uH

0.1 Ohm

C

OUT

10u

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.

2. Recommended minimum R

BOTTOM

: 100 KΩ.

AP6714

Document number: DS31490 Rev. 5 - 2

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VOUT

VIN

C

IN

10u

April 2011

© Diodes Incorporated

AP6714

Pin Descriptions

Pin Name Pin # Description

VCC

EN 2 Enable Channel
CC 3 Channel Compensation Pin
FB 4 Channel Feedback Pin

REF 5 Internal Reference Voltage
SGND 6 Signal Ground
PGND 7 Power Ground

OCP 8 Over Current Protection

LX 9 SW Pin

OUT 10 Boost Output Pin

Functional Block Diagram

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 3 KV

ESD MM Machine Model ESD Protection 250 V

ILX

PD Continuous Power Dissipation (TA = 25oC)

TJ

T

ST

1 Power Input pin

CC

EN

FB

REF

SGND

OUT, V

Schmitt-Trigger

Bias

Error

Amplifier

-

+

Vref=1.23V

BANDGAP

, EN, FB, OCP to GND

CC

Oscillator

Ramp

Soft- Start

Thermal - shutdown

LX to GND -0.3 to (OUT + 0.3) V
LX Current 1.6 A
REF, CC to GND

Operating Junction Temperature Range -40 to +125
Storage Temperature Range -65 to +150

1.8MHz SYNCHRONOUS BOOST CONVERTER

VCC

Power-Good

PWM

Comparator

-

+

ZCR

Comparator

PWM

Control

&

Anti -

Through

Logic

Current - Limit

OCP

Comparator

+

-

OUT

+

-

0.16V

-0.3 to +6.5 V

-0.3 to (VCC + 0.3)

LX

OCP

PGND

850 mW

V

o

C

o

C

AP6714

Document number: DS31490 Rev. 5 - 2

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April 2011

© Diodes Incorporated

AP6714

T

Recommended Operating Conditions

Symbol Parameter Rating Unit

TA

VIN Supply Voltage at V

V

OUT

Notes: 3. The AP6714 is powered by step-up output. An internal low-voltage startup oscillator drives the starting at approximately 0.9V and the main
control will take over as soon as output is reached. AP6714 operation could be kept in low input voltage and output current is just limited.

Electrical Characteristics (V

Symbol Parameter Conditions Min Typ. Max Unit

GENERAL

I

STB

ICC

REFERENCE

V

REF

ΔV

/ΔT

REF

V

REF(LOAD)

V

REF(LINE)

OSCILLATOR

F

OSC

STEP-UP DC-TO-DC

ΔV

/ΔT

OUT

FB Input Leakage Current FB = 1.25V -100 0.01 +100 nA
Duty Step-Up Maximum Duty Cycle FB = 0V 80 85 90 %
I

OUT

I

LXL

R

DS(ON)

ILM

THERMAL-SHUTDOWN PROTECTION

Thermal Shutdown - 150 - oC

Thermal Hysteresis - 40 - oC

LOGIC INPUTS

EN Input Low Level

EN Input High Level

OVER CURRENT PROTECTION

V

OCP

THERMAL RESISTANCE

θ

JA

θ

JC

Notes: 4. The step-up current limit in startup refers to the LX switch current limit, not the output current limit.

5. Test condition for MSOP-10L: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias,
double sided FR-4 PCB.

AP6714

Document number: DS31490 Rev. 5 - 2

Operating Ambient Temperature Range -40 to +85

(Note 3)

IN

Output Voltage 1.8 to 5.5 V

= 3V, TA = 25°C, unless otherwise specified)

CC

Standby Current
Supply Current

Reference Output Voltage 1.205 1.23 1.255 V
Tempco of Reference -40
Reference Load Regulation
Reference Line Regulation

OSC Frequency 1400 1800 2200 KHz

Tempco of Output Voltage

OUT Leakage Current
LX Leakage Current

Switch On-Resistance
N-Channel Current Limit

VCC = 3.6V ,V
VCC = EN = 3.6V, FB = 1.5V

o

C ≤ T ≤ 125 oC 30 50 ppm/ oC

10mA < I

2.8 < VCC < 5.5V

I

OUT

VLX = 0V, OUT = 5V
VLX = OUT = 5V
N channel, Vcc = 5V - 200 ­P channel, Vcc = 5V - 300 ­V

= 1.5V (Note 4)

IN

1.5V < V

1.5V < V

Over Current Protection Voltage

Thermal Resistance Junction-to­Ambient

hermal Resistance

Junction-to-Case

R

OCP

MSOP-10L (Note 5) 161

MSOP-10L (Note 5) 43

1.8MHz SYNCHRONOUS BOOST CONVERTER

0.9 to 5.5 V

= 0V

EN

< 200mA

LOAD

= 10mA, -40 oC ≤ T≤ 85 oC

< 5.5V

CC

< 5.5V

CC

= 0.1Ω

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- 0.5 1 µA

- 150 300 µA

- 4.5 10 mV

- 1.3 5 mV

50 100 ppm/

- 1 5 µA

- 2 5 µA

1.2 1.4 1.6 A

- - 0.4 V

0.8 - - V

- 0.16 - V

© Diodes Incorporated

oC

o

C

mΩ

o

C/W

o

C/W

April 2011

S

P

PLY CURRENT

A

S

P

PLY

C

RRENT

A

A

Y CUR

R

A

REQ

C

Y

M

X

Y

%

Typical Operating Characteristics

300

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

300

275

)

250

μ

(

225

200
175

U

150
125

100

0.9 1.5 1.8 2.4 3 3.6 4.2 5
INPUT VOLTAGE (V)

Fig. 1 Supply Current vs. Input Voltage

1.4

1.2

)

μ

1

ENT (

0.8

0.6

V = 1.5V

IN

V = 3.0V

IN

275

)

250

μ

(

225

200

U

175

U

150
125

100

-40 -25 25 85 125
TEMPERATURE ( C)

2050

2000

1950

(KHz)

1900

UEN

1850

Fig. 2 Supply Current vs. Temperature

°

V = 2.4V

IN

V = 3.6V

IN

ND-B
ST

0.4

0.2

0

-40

Fig. 3 Stand-by Current vs. Temperature

25 105 125

TEMPERATURE ( C)

88

87

°

F

1800

1750

1700

-40 -25 25 85 105 125

1.26

1.25

TEMPERATURE ( C)

Fig. 4 Freq ue ncy vs. Temperature

V = 1.8V

IN

V = 3.6V

IN

°



REF

V (V)

1.24

1.23

1.22

1.21

1.2

V = 5.5V

OUT

I = 10mA

OUT

1.19

-40 -25 25 105 125
TEMPERATURE ( C)

Fig. 6 V vs. T emperature

REF

°

April 2011

© Diodes Incorporated

86

)
(

85

DUT

84

A

83

82

81

-40 -25 25 85 105 125
TEMPERATURE ( C)

°

Fig. 5 Max Duty vs. Temperature

AP6714

Document number: DS31490 Rev. 5 - 2

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CUR

REN

T

MIT (m

A

Typical Operating Characteristics (cont.)

1400

1200

)

1000

LI



EFFI. (%)



EFFI. (%)

V = 3.3V

OUT

ROCP = 0.1

Ω

800

600

400

200

0

0.9 1 1.2 1.3 1.5 1.8 2 2.4 2.6 3
INPUT VOLTAGE (V)

Fig. 7 In put Voltage vs. C ur rent Lim it

100

90
80
70

60
50
40

30
20

V = 1.3V

IN

10

V = 2.5V

OUT

0

10 30 50 80 100 150 200 250

OUTPUT CURRENT (mA)

Fig. 9 EFFI. vs. Output Current



100

90
80
70
60

50
40
30
20

V = 1.3V

IN

10

V = 3.3V

OUT

0

10 30 50 80 100 150 200

OUTPUT CURRENT (mA)

Fig. 11 EFFI. vs. Output Current

I
I

OUT
SW

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

1300
1200

1100
1000

900
800
700
600

500
400
300
200

MAX START UP CURRENT (mA)

100

0

0.9

100

90
80
70
60

50

EFFI. (%)

40
30
20
10

0

100

90
80
70
60

50

EFFI. (%)

40
30
20
10

0

I

OUT

I

SW

V = 3.3V

OUT

1 1.1 1.2 1.3 1.4 1.5 1.8 2 2.2 2.4

INPUT VOLTAGE (V)

Fig. 8 Input Voltage vs. Max Start Up Current

V = 1.5V

IN

V = 2.5V

OUT

10 50 100 150 200 300

OUTPUT CURRENT (mA)

Fig. 10 EFFI. vs. Output Current

V = 1.5V

IN

V = 3.3V

OUT

10 50 100 150 200 300

OUTPUT CURRENT (mA)

Fig. 12 EFFI. vs. Output Current

AP6714

Document number: DS31490 Rev. 5 - 2

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April 2011

© Diodes Incorporated

EFF

%

EFF

%

E

%

F

F

F

F

E

%

Typical Operating Characteristics (cont.)

100



90
80
70

)

60

I. (

50
40

30
20

V = 2.0V

IN

10

V = 3.3V

OUT

0

50 100 150 200 300 400 500

OUTPUT CURRENT (mA)

Fig. 13 EFFI. vs. Output Current

100



90
80
70

)

60
50

FFI. (

40
30

20

V = 3.0V

IN

10

V = 3.3V

OUT

0

50 100 150 200 300 400 500

OUTPUT CURRENT (mA)

Fig. 15 EFFI. vs. Output Current

100



90

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

100



90
80
70

)

60

I. (

50
40

30
20

V = 2.5V

IN

10

V = 3.3V

OUT

0

50 100 150 200 300 400 500

OUTPUT CURRENT (mA)

100



90
80
70
60

I. (%)

50

E

40
30

20
10

0

100



90

Fig. 14 EF FI. vs. Ou tput Curre nt

V = 3.6V

IN

V = 5.0V

OUT

50 100 150 200 300 400 500

OUTPUT CURRENT (mA)

Fig. 16 EFFI. vs. Output Current

80
70
60

I. (%)

50

E

40
30

20

V = 4.2V

IN

10

V = 5.0V

OUT

0

50 100 150 200 300 400 500

OUTPUT CURRENT (mA)

Fig. 17 EFFI. vs. Output Current

80
70

)

60
50

FFI. (

40
30

20

V = 4.5V

IN

10

V = 5.0V

OUT

0

50 100 150 200 300 400 500

OUTPUT CURRENT (mA)

Fig. 18 EFFI. vs. Output Current

AP6714

Document number: DS31490 Rev. 5 - 2

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April 2011

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Typical Operating Characteristics (cont.)

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

Fig. 19 Switching Current vs. Output Ripple

Fig. 21 Load Transient Response

Fig. 20 Switching Current vs. Output Ripple

Fig. 22 Load Transient Response

Fig. 23 Load Transient Response

AP6714

Document number: DS31490 Rev. 5 - 2

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Fig. 24 Load Transient Response

© Diodes Incorporated

April 2011

Typical Operating Characteristics (cont.)

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

Fig. 25 Load Transient Response

Fig. 27 Power On Wave

AP6714

Document number: DS31490 Rev. 5 - 2

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Fig. 26 Load Transient Response

Fig. 28 Power On Wave

© Diodes Incorporated

April 2011

Application Information

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

Input Capacitor Selection

The input filter capacitor reduces peak currents drawn
from the input source and reduces input switching noise.
In most applications a 10µF is recommended.

Output Capacitor Selection

The major parameter necessary to define the output
capacitor is the maximum allowed output voltage ripple of
the converter. This ripple os determined by two
parameters of the capacitor, the capacitance and the
ESR (Equivalent Series Resistance). It is possible to
calculate the minimum capacitance needed for the
defined ripple, supposing that ESR is zero, by using
Equation below:

I

C

where
f =the switching frequency

△V =the maximum allowed ripple

OUT

=

MIN

V(

OUT

×Δ×

VVf

OUT

)INV

−×

Shutdown Mode

The AP6714 converter will stop switching by setting EN
pin Low, and is turned on by pulling it high. If this feature
is not used, the EN pin should be tied to VCC pin to keep
the regulator output on all the time. To ensure proper
operation, the signal source used to drive the EN pin
must be able to swing above and below the specified
turn-on/off voltage thresholds listed in the Electrical

Characteristics section under V

and VIH.

IL

Inductor Selection

The high frequency operation of the AP6714 allo ws the
use of small surface mount inductors. The minimum
inductance value is limited by the following constraints:

V

L

>

Where
f= Operating frequency (Hz)
I

SW(Ripple)

V

IN(MIN)

V

OUT(MAX)

= Allowable Inductor Current Ripple (A)

= Minimum Input Voltage (V)

= Maximum Output Voltage (V)

V(

)MIN(IN

If

V

−×

)MAX(OUT

V

××

)Ripple(SW

)

)MIN(IN

H

)MAX(OUT

Over Current Protection (OCP)

A resistor is required to connect PGND pin and OCP pin
to prevent an overload occurs at the output. The output
voltage will drop and duty cycle will be reduced if the

AP6714

Document number: DS31490 Rev. 5 - 2

www.diodes.com

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OCP exceeds 0.16V. When R
switching current to operate normally is 1.6A
(0.16V/0.1Ω). However, the actual switching current is

related to duty ratio. By the way, larger R
recommended when V

dropped output voltage is smaller then regular case while
an overload condition exists.

Internal circuit of OCP function

OUT

is 0.1Ω, the maximum

OCP

is

OCP

− VIN ≤ 0.5V since the

Thermal Information

The maximum recommended junction temperature (TJ) of
AP6714 is 125°C. The thermal resistance of the 10-pin

MSOP10 package is R
is soldered. Specified regulator operation is assured to

an ambient temperature T
maximum power dissipation is about 500mW. More
power can be dissipated if the maximum ambient
temperature of the application is lower.

P

= 161°C/W, if the Power PAD

θJA

of 45°C. Therefore, the

A

−

T

=

)MAX(D

T

A

)MAX(J

R

θ

JA

Designing a PC Board

Good PC board layout is important to achieve optimal
performance from AP6714. Poor design can cause
excessive conducted and/or radiated noise. Conductors
carrying discontinuous currents and any high-current
path should be made as short and wide as possible. A
separate low-noise ground plane contain-ing the
reference and signal grounds should connect to the
power-ground plane at only one point to minimize the
effects of power-ground currents. Typically, the ground
planes are best joined right at the IC. Keep the voltage­feedback network very close to the IC, preferably within

0.2in (5mm) of the FB pin. Nodes with high dV/dt
(switching nodes) should be kept as small as possible
and should be routed away from high-impedance no des
such as FB.

April 2011

© Diodes Incorporated

Ordering Information

AP6714

1.8MHz SYNCHRONOUS BOOST CONVERTER

G - 13

Green

G : Green

Packing

13 : Tape & Reel

13” Tape and Reel

Quantity Part Number Suffix

Package

M10 : MSOP-10L

Device Package Code

AP 6714 M10

Packaging

(Note 6)

AP6714M10G-13 M10 MSOP-10L 2500/Tape & Reel -13

Notes: 6. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.

Marking Information

( Top View )

10

9876

Logo

Part Number

6714

Y

W X

A~Z : Green
Y : Year : 0~9

W

: Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week

245

1

3

MSOP-10L

Package Outline Dimensions (All Dimensions in mm)

MSOP-10L

1

10x-0.30

2.95/3.05

1

0.17/0.27

2.95/3.05

0.1/0.2

C

0.10

0.75/0.95

0.5Typ.

0.05/0.15

AP6714

Document number: DS31490 Rev. 5 - 2

4.8/5.0

8x-0.50

10x-1.4

Land Pattern Recommendation

1.10Max.

Seting plane

C

0.4/0.7

1

(Unit:mm)

0.25
Gauge plane

°

8

/

°

0

4.4

"A"

DETAIL "A"

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April 2011

© Diodes Incorporated

AP6714

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 A ND 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 Incorporat ed 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. A ny 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, harml ess ag ai nst all damages.

Diodes Incorporated does not warrant or acc ept any liability whatsoever in respec t of any products purchas ed 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 agai nst all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death ass ociated with such unintended or unauthorized application.

Products described herein may be covered by one or more United Stat es, 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.

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 herei n:

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 instructi ons for us e 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 agai nst any damages arising out of the use of Diodes
Incorporated products in such safety-critic al, l ife support devic es or syst ems .

Copyright © 2011, Diodes Incorporated

www.diodes.com

1.8MHz SYNCHRONOUS BOOST CONVERTER

IMPORTANT NOTICE

LIFE SUPPORT

AP6714

Document number: DS31490 Rev. 5 - 2

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