Diodes AP65200 User Manual

A

C

Y

%

LIGHT LOAD IMPROVED 2A SYNCH DC/DC BUCK CONVERTER

high

Pin Assignments

Applications

 Gaming Consoles  Flat Screen TV Sets and Monitors  Set Top Boxes  Distributed Power Systems  Home Audio  Consumer Electronics  Network Systems  FPGA, DSP and ASIC Supplies  Green Electronics

Description

The AP65200 is a 340kHz switching frequency external compensated

synchronous DC/DC buck converter. It has integrated low R

DSON

and low side MOSFETs.

The AP65200 enables continues load current of up to 2A with

efficiency as high as 95%.

The AP65200 implements an automatic custom light load

efficiency improvement algorithm.

The AP65200 features current mode control operation, which enables

fast transient response times and easy loop stabilization.

The AP65200 simplifies board layout and reduces space

requirements with its high level of integration and minimal need for

external components, making it ideal for distributed power

architectures.

The AP65200 is available in a standard Green SO-8, MSOP-8EP,

NEW PRODUCT

U-DFN2626-10 and SO-8EP package and is RoHS compliant.

Features

 VIN 4.7V to 18V  2A Continuous Output Current, 3A Peak  Efficiency Up to 95%  Automated Light Load improvement  V  340kHz Switching Frequency  External Programmable Soft-Start  Enable Pin  OCP and Thermal Protection  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3)

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.

Adjustable to 0.925 to 16V

OUT

Typical Applications Circuit

100

5V

IN

95

P65200

)

(

IEN

EFFI

AP65200

Document number: DS35548 Rev. 6 - 2

12V

90

85

80

75

IN

LOAD CURRENT (A)

Effici ency vs . Load Current

V = 3.3V

OUT

2.01.80.20.0 0.60.4 1.00.8 1.41.2 1.6

January 2014

1 of 18

www.diodes.com

Figure 1 Typical Application Circuit

A

Pin Descriptions

Pin Number

Name

BS 1 2

IN 2 3

SW 3 4

GND 4 5. 6 Ground

FB 5 7

COMP 6 8

SO-8

SO-8EP

MSOP-8EP

NEW PRODUCT

EN 7 9

SS 8 10

AGND NA 1 Analog GND

PAD Exposed PAD for thermal performance improvement connect to GND

Functional Block Diagram

U-DFN2626-10

P65200

Function

High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET a

0.01µF or greater capacitor from SW to BS to power the high side switch.

Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.7V to 18V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor.

Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch.

Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider connected to it from the output voltage. The feedback threshold is 0.925V. See Setting the Output Voltage.

Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. See Compensation Components.

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator; low to turn it off.

Attach EN to IN with a 100kΩ pull up resistor for automatic startup. With this configuration an internal voltage clamp ensures that a safe voltage is set for Enable not to exceed the absolute maximum voltage for this pin.

Soft-Start Control Input. 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 floating.

AP65200

Document number: DS35548 Rev. 6 - 2

2 of 18

www.diodes.com

January 2014

A

Absolute Maximum Ratings (Note 4) (@T

Symbol Parameter Rating Unit

VIN

VSW

VBS

VFB

VEN

V

COMP

TST

TJ

TL

ESD Susceptibility (Note 5)

HBM Human Body Model 1.5 kV

MM Machine Model 150 V

Notes: 4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.

5. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

NEW PRODUCT

handling and transporting these devices.

Supply Voltage

Switch Node Voltage

Bootstrap Voltage

Feedback Voltage -0.3V to +6.0 V

Enable/UVLO Voltage -0.3V to +6.0 V

Comp Voltage -0.3V to +6.0 V

Storage Temperature -65 to +150 °C

Junction Temperature +160 °C

Lead Temperature +260 °C

= +25°C, unless otherwise specified.)

A

-0.3 to +20

-1.0 to V

V

-0.3 to VSW +6.0

SW

IN

+0.3

Thermal Resistance (Note 6)

P65200

V

Symbol Parameter Rating Unit

SO-8 119

θJA

θJC

Note: 6. Test condition: SO-8: Device mounted on 1"x1" FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout.

SO-8EP: Device mounted on 2"x2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout and thermal vias to bottom layer GND

plane. MSOP-8EP: Device mounted on 2"x2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout. U-DFN2626-10: Device mounted on 2"x2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout.

Recommended Operating Conditions (Note 7) (@T

Symbol Parameter Min Max Unit

VIN

TA

Note: 7. The device function is not guaranteed outside of the recommended operating conditions.

AP65200

Document number: DS35548 Rev. 6 - 2

Supply Voltage

Operating Ambient Temperature Range

Junction to Ambient

Junction to Case

= +25°C, unless otherwise specified.)

A

3 of 18

www.diodes.com

SO-8EP 40

MSOP-8EP 48

U-DFN2626-10 53

SO-8 31

SO-8EP 9

MSOP-8EP 9

U-DFN2626-10 8.5

4.7

-40

18.0 V

+85 °C

°C/W

January 2014

A

Electrical Characteristics (@T

Symbol Parameter Test Conditions Min Typ Max Unit

IIN

R

DS(ON)1

R

DS(ON)2

I

LIMIT

I

LIMIT

Shutdown Supply Current

Supply Current (Quiescent)

High-Side Switch On-Resistance (Note 8) 130 mΩ

Low-Side Switch On-Resistance (Note 8) 130 mΩ

HS Current Limit Minimum Duty Cycle 4.4 A

LS Current Limit From Drain to Source 0.9 A

High-Side Switch Leakage Current

AVEA

Error Amplifier Voltage Gain (Note 8)

GEA Error Amplifier Transconductance

COMP to Current Sense Transconductance

Oscillator Frequency

Fold-back Frequency

Maximum Duty Cycle

Minimum On Time 130 ns

Feedback Voltage

NEW PRODUCT

GCS

FSW

FFB

D

MAX

TON

VFB

Feedback Overvoltage Threshold 1.1 V

V

EN_RISING

EN Rising Threshold 0.7 0.8 1.2 V

EN Lockout Threshold Voltage 2.2 2.5 2.7 V

EN Lockout Hysteresis 220 mV

INUV

V

VTH

VIN Under Voltage Threshold Hysteresis

HYS

Under Voltage Threshold Rising

IN

Soft-Start Current

Soft-Start Period

TSD

Note: 8. Guaranteed by design.

Thermal Shutdown (Note 8) 160 °C

AP65200

Document number: DS35548 Rev. 6 - 2

= +25°C, VIN = 12V, unless otherwise specified.)

A

VEN = 0V

VEN = 2.0V, VFB = 1.0V

V

= 0V, VSW = 0V, V

EN

SW

=12V

800 V/V

∆I

= ±10µA

C

2.8 A/V

V

= 0.75V

FB

V

= 0V

FB

VFB = 800mV

TA = -40°C to +85°C

3.80 4.05 4.40 V

250 mV

V

= 0V

SS

C

= 0.1µF

SS

4 of 18

www.diodes.com

P65200

0.3 3.0 µA

0.6 1.5 mA

0 10 μA

1000 µA/V

300 340 380 kHz

0.30

90 %

900 925 950 mV

6 μA

15 ms

fSW

January 2014

A

O

Y

C

R

OUTPU

T VOLTAG

F

C

OLT

G

Typical Performance Characteristics (@T

0.40

= +25°C, VIN = 12V, V

A

= 3.3V, unless otherwise specified.)

OUT

0.024

P65200

NEW PRODUCT

0.35

0.30

0.25

0.20

0.15

0.10

QUIESCENT SUPPLY CURRENT (mA)

0.05

0.00 0 5 10 15 20

Quiescent Supply Current vs. Input Voltage

4.65

4.60

4.55

4.50

4.45

4.40

INPUT VOLTAGE (V)

0.022

0.020

0.018

ENT (µA)

U

0.016

0.014

0.012

0.010

WN SUPPL

0.008

SHUTD

0.006

0.004 0 5 10 15 20

3.330

3.329

3.328

3.327

E (V)

3.326

3.325

Shutdown Supply Current vs. Input Voltage

INPUT VOLTAGE (V)

V = 12V

IN

4.35

4.30

CURRENT LIMIT (A)

4.25

4.20

4.15

-50 0 50 100 TEMPERATURE (°C)

Current Limit vs. Temperature

0.932

0.930

0.928

E (V)

0.926

A

0.924

K V

0.922

EEDBA

0.920

0.918

3.324

3.323

3.322

3.321

3.320

4.75 9.75 14.75 19.75 24.75

344

343

342

341

340

339

338

OSCILLATOR FREQUENCY (KHZ)

337

INPUT VOLTAGE (V)

Line Regulation

0.916

-50 0 50 100

AP65200

Document number: DS35548 Rev. 6 - 2

TEMPERATURE (°C)

Feedback Voltage vs. Temperature

5 of 18

www.diodes.com

336

-50 0 50 100 TEMPERATURE (°C)

Oscillator Frequency vs. Temperature

January 2014

A

F

FIC

N

C

Y

F

FICIENCY

C

Y

Typical Performance Characteristics (cont.) (@T

95

5V

85

IN

12V

IN

75

(%)

65

IE

E

55

18V

IN

= +25°C, VIN = 12V, V

A

100

95

(%)

90

85

E

= 3.3V, unless otherwise specified.)

OUT

5V

IN

12V

IN

18V

IN

P65200

80

75

LOAD CURRENT (A)

Efficiency vs. Load Current

V = 3.3V

OUT

2.01.80.20.0 0.60.4 1.00.8 1.41.2 1.6

NEW PRODUCT

45

35

100

1.0

1.20.00.20.40.6 1.82.01.4 1.60.8

LOAD CURRENT (A)

Efficiency vs. Load Current

V = 1.2V

OUT

95

12V

IN

90

18V

IN

(%)

IEN

EFFI

85

80

75

70

65

60

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 2.01.81.6 LOAD CURRENT

Efficiency vs. Load Current

V = 5V

OUT

AP65200

Document number: DS35548 Rev. 6 - 2

6 of 18

www.diodes.com

January 2014