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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