Diodes AP6015 User Manual

AP6015

High Efficiency Step-Down Low Power DC-DC Converter

Features

• High efficiency synchronous step-down converter with greater than 94%

• Current Mode Operation for faster transient response and better loop stab ilization

• 2.5V to 5.5V operating input voltage range

• Adjustable output voltage range from 0.8V to V

• Fixed output voltage options: 1.8V, 2.5V and 3.3V

• Up to 800mA output current

• High efficiency over a wide range of load currents

• PWM operation mode

• Internal soft-start function

• Typical quiescent current of 150μA

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

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Applications

• Mobile Handsets

• PDAs, Ult ra Mobile PCs

• Portable Media Players, Digital Still/Video Cameras

• USB-based DSL Modems

• LAN/WLAN/WPAN/WWAN Modules

General Description

The AP6015 is the first device in a family of lo w-noise current mode synchronous step-down DC-DC converters. It is ideally suited for systems powered by either a 1-cell Li-ion battery or a 2to 3-cell NiCd/ NiMH/ Alkaline battery.

IN

The AP6015 is a synchronous PWM converter with integrated N- and P-channel power MOSFET s witches. Compared to the asynchronous topology, synchronous rectification offers the benefits of higher efficiency and reduced com ponent cou nt. The high operating frequency of 1MHz allows small inductor and capacitor to be used. This results in small pcb area. During shut-down, the standby current drops to 1μA or less. The AP6015 is available in the 10-pin MSOP package. It operates over a free-air temperature range of -40

o

C to 85o C.

Ordering Information

AP 6015 - XX

Voltage

Blank : Adj

Package

M10 : MSOP-10L

18 : 1.8V 25 : 2.5V 33 : 3.3V

Device

AP6015-XXM10G-13 M10 MSOP-10L 2500/Tape & Reel -13

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

2. 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

AP6015 Rev. 3 1 of 18 FEBRUARY 2009

Package

Code

.

M10 G - 13

Green

G : Green

Packaging

(Note 2)

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Quantity Part Number Suffix

13” Tape and Reel

Packing

13 : Tape & Reel

Pin Assignment

AP6015

High Efficiency Step-Down Low Power DC-DC Converter

( Top View )

PVCC

VCC GND

FB/Vout

1 2

3 4

PG

56

MSOP-10L

10

9 8

7

PGND

LX

EN

NC

CC

Pin Descriptions

Pin Name Pin NO. I/O Description

PVCC 1 I

VCC 2

GND 3 Ground

PG 4 O

FB 5 I Feedback pin for the fixed output voltage option.

Supply voltage input Supply bypass pin. A 1μF coupling c apacitor s hould be conn ected as cl ose

as possible t o t hi s pi n.

Power good comparator output. A pull-up resistor should be connected between PG and V

.

O

CC 6 I Compensation pin NC 7 NC EN 8 I Enable.Pin, H: Enable. L:shutdown

LX 9 I/O Connect the inductor to this pin.

PGND 10 Power ground

AP6015 Rev. 3 2 of 18 FEBRUARY 2009

No connect

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)

Block Diagram

VCC

AP6015

High Efficiency Step-Down Low Power DC-DC Converter

CC

PG

EN

CE

UVLO

SSSS

TS Bias

Open drain

-

ER-AMP

+

FB

Vref=0.8V

-

PG_COM

+

BANDGAP

Osc

Vramp

GND

Notes: 3. The adjustable output voltage version does not use the internal feedback resistor divider.

The FB pin is directly connected to the error amplifier.

Current

Protection

+

PWM-COM-

-

Buffer

PVCC

LX

PGND

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 2.5 KV

ESD MM Machine Model ESD Protection 300 V

PVCC, VCC Supply Voltage -0.3 to +5.5 V

Voltages on pins EN, CC, PG, FB, LX -0.3 to VIN +0.3 V

T

Maximum Junction Temperature Range +150

J(MAX

TST Storage temperature range -65 to +150

TOP Operating Junction Temperature Range -40 to +125

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress rati ngs only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not impli ed. E xposure to absolute-maximum-rated conditions for extended periods ma affect device reliability.

o

C

o

C

o

C

AP6015 Rev. 3 3 of 18 FEBRUARY 2009

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AP6015

High Efficiency Step-Down Low Power DC-DC Converter

Recommended Operating Conditions (T

:-40~85°C)

A

Symbol Parameter Rating Unit

TA Operating Ambient Temperature Range -40 to +85

o

C VIN Supply Voltage 2.0 to 5.5 V VO Output voltage range for adjustable output voltage version 0.8 to VI V

L Inductor (see Note 4) 3.3 μH

Ci Input capacitor (see Note 4) 10 μF

Co Output capacitor (see Note 4) VO ≥ 1.8V 10 μF

Notes: 4. Refer to application section for further information.

Electrical Characteristics (T

=25°C)

A

Over recommended operating free-air temperature range, VI=3.6V, VO=2.5V, IO=300mA, EN=VIN. (unless otherwise noted)

Symbol Parameter Conditions Min Typ. Max Unit

Supply current

I

= 0mA to 800mA 2.5 - 5.5

O

-20 to 85

o

C

IO= 0mA to 500mA 2 - 5.5

VIN Input Voltage range

-40 to 85 oC

I

= 0mA to 600mA 2.5 5.5

O

V

IO= 0mA to 400mA 2 - Iccq Operating quiescent current IO= 0mA - 150 - μA I

Standby current EN= GND - 0.1 1 μA

STBY

Enable

≤ 3V 1.5 - -

V

VIH

EN high-level input voltage

IN

VIN> 3V 2.5 - -

VIL EN low-level input voltage - - 0.7 V

IL EN input leakage current EN= GND or VIN - 0.01 0.1 μA

V

Under-voltage-lockout-threshold 1.2 1.6 1.95 V

(UVLO)

V

AP6015 Rev. 3 4 of 18 FEBRUARY 2009

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(

)

(

)

(FB)

T

AP6015

High Efficiency Step-Down Low Power DC-DC Converter

Electrical Characteristics (Continued)

Over recommended operating free-air temperature range, VI=3.6V, VO=2.5V, IO=300 mA, EN=VIN. (unless otherwise noted)

Symbol Parameter Conditions Min Typ. Max Unit

Power switch and current limit

=3.6V; I=200mA 200 280 410

V

I=VGS

VI=VGS=2V; I=200mA - 480 V

=3.6V; IO=200mA 200 280 410

I=VGS

VI=VGS=2V; IO=200mA - 500 -

R

DS(on)

P-channel MOSFET on-resistance P-channel leakage current VDS=5.5V - - 1 μA N-channel MOSFET on-resistance N-channel leakage current VDS=5.5V - - 1 μA

I

P-channel current limit 2.5V≤VI≤5.5V 1200 - 1600 mA

LIM

Power good output (see Note 5)

V

Power good threshold Feedback voltage falling

(PG)

88%

92%

V

O

VO

94%

VO

Power good hysteresis 2.5% VO VOL PG output low voltage I

PG output leakage current V

LKG

Minimum supply voltage for valid

power good signal

(FB)

I

=10μA

sink

=VO nominal 0.01 1 μA

1.2 - - V

- - 0.3 V

=0.8×VO nominal;

V

Oscillator

FS Oscillator frequency 800 1000 1200 KHz

Output

VO Adjustable output voltage range 0.8 5.5 V

V

Reference voltage 0.784 0.8 0.816 V

REF

AP6015-Adj AP6015-1.8V

Fixed output

VO

voltage

(see Note 6)

AP6015-2.5V

AP6015-3.3V

Line regulation

Load regulation

η Efficiency

Start-up time

θ

Notes: 5. Power good is not valid for the first 100μs after EN goes high. Please refer to the application section for more information.

double sided FR-4 PCB

Thermal Resistance

JA

Junction-to-Ambient

hermal Resistance

JC

Junction-to-Case

6. The output voltage accuracy includes line and load regulation over the full temperature range.

7. Test condition for MSOP-10L: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias,

=2.5V to 5.5V;

V

I

0mA ≤ I

≤ 800mA

O

10mA ≤ IO ≤ 800mA

=2.7V to 5.5V;

V

I

0mA ≤ I

≤ 800mA

O

10mA ≤ IO ≤ 800mA

=3.6V to 5.5V;

V

I

0mA ≤ I

≤ 800mA

O

10mA ≤ IO ≤ 800mA

= VO ＋0.5 V ( min.2V )

V

I

to 6.0V; I

=10mA

O

VI=5.0V; I

=10mA to 800mA

O

=5V; VO=3.3V; IO=300mA

V

I

VI=3.6V; VO=2.5V; IO=200mA IO=0mA, time from active EN to V

O

－3% －3%

－3% －3% －3% －3%

- 4%

- 3%

- 4%

- 3%

- 4%

- 3%

0.3 %/V

0.8 % 94 %

0.4 1 4 ms MSOP-10L (Note 7) 161 MSOP-10L (Note 7) 39

mΩ

o

C/W

o

C/W

V

AP6015 Rev. 3 5 of 18 FEBRUARY 2009

High Efficiency Step-Down Low Power DC-DC Converter

Typical Application Circuit

For best transient response we suggest that R V

< 3.0V, V

IN

V

≥ 3.0V, V

IN

V

≥ 3.0V, V

IN

OUT OUT OUT

(1) ADJ Output

< 2.5V 200KΩ 33PF < 2.5V ≥ 2.5V

R

C

CC

68KΩ 100PF 82KΩ 100PF

, C

and L1 values as below.

CC

L1-WURTH C1, C2 (MLCC)

CC

AP6015

1.8µH 10µF

3.3µH 10µF

VI3.0 V to 5.5 V

C1

10µF

(2) FIXED Output

Typical Application

5 V

V

I

C1

10uF

L1

9

5

4

10

CC

R3 680K

Power Good

R1

C2

10µF

R2

because of stability reasons.

R

1

VV

REFO

)1(

+×=

R

2

100 Ohm

C3

1µF

1

2

8

PVCC

VCC

EN

GND

LX

FB

AP6015

PG

PGND

CC

63

Rcc

C 100pF

R2: Suggest to be 39K~100K

Typical Application Circuit for Adjustable Output Voltage Option

L1

LX

FB

PG

9

5

R3

4

680K

Power Good

1.8/ 2.5/ 3.3V/ 800mA

V

O

C2 10uF

100 Ohm

1

2

8

PVCC

VCC

AP6015

EN

2.5 V/800 mA

V

O

C3

1uF

GND CC

63

PGND

Rcc

C

100pF

10

CC

Standard 5 V to 1.8/ 2.5/ 3.3V/ 800mA Conversion; High Efficiency

AP6015 Rev. 3 6 of 18 FEBRUARY 2009