Diodes AUR9719 User Manual

1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719

Data Sheet

General Description

The AUR9719 is a high efficiency step-down
DC-DC voltage converter. The chip operation is
optimized by peak-current mode architecture with
built-in synchronous power MOS switchers. The
oscillator and timing capacitors are all built-in
providing an internal switching frequency of

1.5MHz that allows the use of small surface mount
inductors and capacitors for portable product
implementations.

Integrated Soft Start (SS), Under Voltage Lock Out
(UVLO), Thermal Shutdown Detection (TSD) and
Short Circuit Protection are designed to provide
reliable product applications.

The device is available in adjustable output voltage
versions ranging from 0.8V to 9×V
voltage range is from 2.7V to 5.5V , and is able to
deliver up to 2.0A.

The AUR9719 is available in DFN-3×3-6 package.

when input

IN

Features

• High Efficiency Buck Power Converter

• Output Current: 2A

• Low R

• Adjustable Output Voltage from

• Wide Operating Voltage Range: 2.7V to 5.5V

•

Built-in Power Switches for Synchronous

Rectification with High Efficiency

• 800mV Feedback Voltage

• 1.5MHz Constant Frequency Operation

• Thermal Shutdown Protection

• Low Drop-out Operation at 90% Duty Cycle

• No Schottky Diode Required

Internal Switch: 100mΩ

DS(ON)

0.8V to 9×VIN

Applications

• LCD TV

• Set Top Box

• Post DC-DC Voltage Regulation

• PDA and Notebook Computers

DFN-3×3-6

Figure 1. Package Type of AUR9719

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719

Pin Configuration

D Package

(DFN-3×3-6)

Pin 1 Mark

1

Expose d

2

Figure 2. Pin Configuration of AUR9719 (Top View)

Pad

6

5

43

Pin Description

Pin

Number

1 FB INPUT Output voltage feedback pin

2 GND GROUND Ground pin

3 SW OUTPUT Switch output pin

4 VIN_SW INPUT Power supply input for the MOSFET switch

5 VIN_A INPUT Supply input for the analog circuit

6 EN INPUT Enable pin. Active high

Pin Name I/O Function

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719

Functional Block Diagram

FB

EN

6

Saw-tooth
Generator

Bias

Generator

Soft

Start

1

-

+

Error

Amplifier

Oscillator

+

+

-

Modulator

-

+

Over Voltage

Bandgap

Reference

Comparator

Over Current

Comparator

Control

Logic

Reverse Inductor

Current Comparator

VIN_A

5

Current

Sensing

Buffer &

Dead Time

Control

Logic

-

+

VIN_SW

4

2

3

SW

GND

Figure 3. Functional Block Diagram of AUR9719

Ordering Information

AUR9719 A

Circuit Type

A: Adjustable Output

5

Package
D: DFN-3×3-6
G: Green

Package

DFN-3×3-6 -40 to 80°C AUR9719AGD 9719A Tape & Reel

Temperature

Range

Part Number Marking ID Packing Type

BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and
green.

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Input Voltage (VIN_SW) V

Supply Input Voltage (VIN_A) V

Voltage from VIN_SW to VIN_A Pin V

SW Pin Switch Voltage VSW

SW Pin Switch Current ISW 3.2 A

Enable Voltage VEN

Power Dissipation (On PCB, TA=25°C) PD

Thermal Resistance (Junction to Ambient, Simulation) θJA

Operating Junction Temperature TJ

Operating Temperature TOP

Storage Temperature T

ESD (Human Body Model) V

ESD (Machine Model) VMM

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

IN_SW

IN_A

IN(SW_A)

STG

HBM

0 to 6.0

0 to 6.0

-0.3 to 0.3

-0.3 to

V

+0.3

IN_SW

-0.3 to

V

+0.3

IN_A

2.49

40.11

150

-40 to 85

-55 to 150

2000

200

V

V

V

V

V

W

°C/W

°C

°C

°C

V

V

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Input Voltage VIN 2.7 5.5 V

Junction Temperature Range TJ -20 125 °C

Ambient Temperature Range TA -40 80 °C

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719

Electrical Characteristics

V

IN_SW=VIN_A=VEN

specified.

=5V, V

=1.2V, VFB=0.8V, L=3.3µH, CIN=4.7µF, C

OUT

=22µF, TA=25°C, unless otherwise

OUT

Parameter Symbol Test Condition Min Typ Max Unit

Input Voltage Range V

Shutdown Current I

IN

OFF

Active Current ION VFB=0.95V 460 µA

Regulated Feedback
Voltage

V

FB

VIN=V

IN_SW=VIN_A

2.7 5.5 V

VEN=0V 4 µA

For Adjustable Output Voltage 0.784 0.8 0.816 V

Regulated Output
Voltage Accuracy

Peak Inductor
Current

Oscillator Frequency f

PMOSFET RON R

NMOSFET RON R

EN Input High
Threshold Voltage

EN Input Low
Threshold Voltage

∆V

/V

OUT

OUT

=2.7V to 5.5V, I

V

IN

2A

=10mA to

OUT

-3 3 %

IPK 2.2 3.2 A

1.2 1.5 1.8 MHz

OSC

ISW=0.75A 100 mΩ

ON(P)

ISW=0.75A 100 mΩ

ON(N)

1.5 V

V

EN_H

V

0.4 V

EN_L

EN Input Current IEN 2 µA

Soft-start Time tSS 450 µs
Maximum Duty

Cycle

D

90 %

MAX

Rising 2.4

Under Voltage Lock
Out Threshold

V

UVLO

Falling 2.3

V

Hysteresis 0.1

Thermal Shutdown TSD Hysteresis=30°C 150 °C

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719

Typical Performance Characteristics

100

90
80
70
60
50
40
30

Efficiency (%)

20
10

0

0.0 0.5 1.0 1.5 2.0

Output Current (A)

V

OUT

Figure 4. Efficiency vs. Output Current (V

VIN=3.3V
VIN=4.2V
VIN=5.0V
VIN=5.5V

=1.0V

=1.0V) Figure 5. Efficiency vs. Output Current (V

OUT

100

90
80
70
60
50
40
30

Efficiency (%)

20

V

10

0

0.0 0.5 1.0 1.5 2.0

=1.2V

OUT

Output Current (A)

OUT

VIN=3.3V
VIN=4.2V
VIN=5.0V
VIN=5.5V

=1.2V)

100

90
80
70
60
50
40
30

Efficiency (%)

20
10

0

0.0 0.5 1.0 1.5 2.0

Output Current (A)

V

=1.8V

OUT

VIN=3.3V
VIN=4.2V
VIN=5.0V
VIN=5.5V

Figure 6. Efficiency vs. Output Current (V

=1.8V) Figure 7. Efficiency vs. Output Current (V

OUT

100

90
80
70
60
50
40
30

Efficiency (%)

20
10

0

0.0 0.5 1.0 1.5 2.0

V

OUT

Output Current (A)

OUT

VIN=3.3V
VIN=4.2V
VIN=5.0V
VIN=5.5V

=2.5V

=2.5V)

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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