Diodes AP65201WU-7 Schematic [ru]

AP65201

Document number: DS36109 Rev. 2 - 2

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AP65201

Description

The AP65201 is a 500kHz switching frequency internal compensated
synchronous DC/DC buck converter. It has integrated low R

DS(ON)

high and low side MOSFETs.
The AP65201 enables continuous load current of up to 2A with

efficiency as high as 97%.
The AP65201 implements an automatic custom light load efficiency

improvement algorithm.
The AP65201 features current mode control operation, which enables

fast transient response times and easy loop stabilization.
The AP65201 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 AP65201 is available in a standard Green TSOT26 package and
is RoHS compliant.

Features

 VIN 4.5V to 16V
 2A Continuous Output Current, 3A Peak
 Efficiency Up to 97%
 Automated Light Load improvement
 V

OUT

Adjustable from 0.8V

 500kHz Switching Frequency
 Internal Soft-Start
 Enable Pin
 Overcurrent Protection (OCP) with Hiccup
 Thermal Protection
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

TSOT26

Top View

3

2

1 6

4

5

GND

SW

IN

BST

EN

FB

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

AP65201

L1

4.7μH

R1

40.2kΩ

R2

13kΩ

C5
1µF

C2

22μF

C1
22μF

ON

OFF

3

IN

5
EN

2

SW

6

BST

4

FB

1

GND

INPUT

OUTPUT

V

OUT

3.3V

VIN

12V

R3

75kΩ

Figure 1. Typical Application Circuit

TSOT26 LIGHT LOAD IMPROVED 2A SYNCH DC/DC BUCK CONVERTER

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.

Typical Applications Circuit

AP65201

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AP65201

Pin

Name

Pin Number

Function

TSOT26

GND

1

Ground

SW

2

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.

IN

3

Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.5V
to 16V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See Input Capacitor.

FB

4

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 0.8V. See Setting the Output Voltage.

EN

5

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 to IN with a 100kΩ pull up resistor for automatic startup.

BST

6

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.

E

+

-

+

-

+

-

+

1.1V

0.3 V

INTERNAL

REFERENCE

Logic

0.8V

+

-

Internal

SS

+

-

OSCILLATOR

CURRENT

SENSE

AMPLIFIER

OVP

RAMP

CLK

CURRENT

COMPARATOR

FB

EN

0.8 V
GND

SW

BST

IN

500KHz

0.3V

1.1V

Vcc

REGULATOR

Pin Descriptions

Functional Block Diagram

AP65201

Document number: DS36109 Rev. 2 - 2

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AP65201

Symbol

Parameter

Rating

Unit

VIN

Supply Voltage

-0.3 to 20

V

VSW

Switch Node Voltage

-1.0 to V

IN

+0.3

V

VBS

Bootstrap Voltage

V

SW

-0.3 to VSW +6.0

V

VFB

Feedback Voltage

-0.3V to +6.0

V

VEN

Enable/UVLO Voltage

-0.3V to +6.0

V

TST

Storage Temperature

-65 to +150

°C

TJ

Junction Temperature

+160

°C

TL

Lead Temperature

+260

°C

ESD Susceptibility (Note 5)

HBM

Human Body Model

2.5

KV

CDM

Charged Device Model

1

KV

Symbol

Parameter

Rating

Unit

θ

JA

Junction to Ambient

TSOT26

120

°C/W

θ

JC

Junction to Case

TSOT26

30

°C/W

Symbol

Parameter

Min

Max

Unit

VIN

Supply Voltage

4.5

16

V

TA

Operating Ambient Temperature Range

-40

+85

°C

Absolute Maximum Ratings (@T

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
handling and transporting these devices.

= +25°C, unless otherwise specified.) (Note 4)

A

Thermal Resistance (Note 6)

Note: 6. Test condition for SOT26: Device mounted on FR-4 substrate, single-layer PC board, 2oz copper, with minimum recommended pad layout

Recommended Operating Conditions (@T

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

= +25°C, unless otherwise specified.) (Note 7)

A

AP65201

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AP65201

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

I

SHDN

Shutdown Supply Current

VEN = 0V

— 1.0

µA

IQ

Supply Current (Quiescent)

VEN = 2.0V, VFB = 0.85V

—

0.83 — mA

R

DS(ON)1

High-Side Switch On-Resistance (Note 8)

— — 160 — mΩ

R

DS(ON)2

Low-Side Switch On-Resistance (Note 8)

— — 85 — mΩ

I

LIMIT

HS Current Limit (Note 8)

Minimum duty cycle

2.8

3.5 — A

I

SW_LKG

High-Side Switch Leakage Current

VEN = 0V, V

SW

=12V

— — 1

μA

FSW

Oscillator Frequency

V

FB

= 0.75V

400

500

600

kHz

D

MAX

Maximum Duty Cycle

VFB = 700mV

88

92 — %

TON

Minimum On Time

— — 90 — nS

VFB

Feedback Voltage

TA = -40°C to +85°C

776

800

824

mV

V

EN_RISING

EN Rising Threshold

—

1.4

1.5

1.6

V

V

EN_FALLING

EN Falling Threshold

—

1.23

1.32

1.41

V

IEN

EN Input Current
VEN = 2V

—

2.85 — μA

V

EN

= 0V

— 0 —

μA

INUV

VTH

V

IN

Undervoltage Threshold Rising

—

3.7

4.05

4.4

V

INUV

HYS

VIN Undervoltage Threshold Hysteresis

— — 250 — mV

TSS

Soft-Start Period

— — 1 — mS

T

SHDN

Thermal Shutdown (Note 8)

— — +160 — °C

T

HYS

Thermal Hysteresis (Note 8)

— — +20 — °C

Electrical Characteristics (@T

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

A

Note: 8. Guaranteed by design.

AP65201

Document number: DS36109 Rev. 2 - 2

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AP65201

VIN=6.5V

VIN=12V

VIN=16V

VIN=4.7V

VIN=12V

VIN=16V

VIN=4.7V

VIN=12V

VIN=16V

VIN=4.7V

VIN=12V

VIN=16V

Typical Performance Characteristics (@T

= +25°C, VIN = 12V, V

A

= 3.3V, L = 4.7µH, unless otherwise specified)

OUT