Diodes AUR9710 User Manual

1.5MHz, 1A, Step-down DC-DC Converter AUR9710

Data Sheet

General Description

The AUR9710 is a high efficiency step-down
DC-DC voltage converter. The chip operation is
optimized using constant frequency, peak-current
mode architecture with built-in synchronous power
MOSFET switchers and internal compensators to
reduce external part counts. It is automatically
switching between the normal PWM mode and LDO
mode to offer improved system power efficiency
covering a wide range of loading conditions.

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.
Additional features including Soft Start (SS), Under
Voltage Lock Out (UVLO) and Thermal Shutdown
Detection (TSD) are integrated to provide reliable
product applications.

The device is available in adjustable output voltage
versions ranging from 1V to 3.3V, and is able to
deliver up to 1A.

The AUR9710 is available in WDFN-3×3-10
package.

Features

• High Efficiency Buck Power Converter

• Low Quiescent Current

• Output Current: 1A

• Adjustable Output Voltage from 1V to 3.3V

• Wide Operating Voltage Range: 2.5V to 5.5V

•

Built-in Power Switchers for Synchronous

Rectification with High Efficiency

• Feedback Voltage: 800mV

• 1.5MHz Constant Frequency Operation

• Automatic PWM/LDO Mode Switching Control

• Thermal Shutdown Protection

• Low Drop-out Operation at 100% Duty Cycle

• No Schottky Diode Required

Applications

• Battery Powered Devices

• Mobile Phone, Digital Camera and MP3 Player

• Headset, Radio and Other Hand-held Instruments

• PCI Card, WiFi card

• PDA and Notebook Computer

WDFN-3×3-10

Figure 1. Package Type of AUR9710

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

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Data Sheet

1.5MHz, 1A, Step-down DC-DC Converter AUR9710

Pin Configuration

D Package

(WDFN-3×3-10)

Figure 2. Pin Configuration of AUR9710 (Top View)

Pin Description

Pin Number Pin Name Function

1 FB Feedback voltage from the output of the power supply

2, 9 GND

3, 8 SW

4, 7 VIN Power supply input

5, 6 NC No internal connection

This pin is the GND reference for the NMOSFET power stage. It
must be connected to the system ground

Connected to inductor

10 EN Enable signal input, active high

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

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Data Sheet

1.5MHz, 1A, Step-down DC-DC Converter AUR9710

Functional Block Diagram

Figure 3. Functional Block Diagram of AUR9710

Ordering Information

AUR9710 A

Circuit Type

A: Adjustable Output

5

Package

WDFN-3×3-10 -40 to 80°C AUR9710AGD 9710A 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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Package
D: WDFN-3×3-10
G: Green

Data Sheet

1.5MHz, 1A, Step-down DC-DC Converter AUR9710

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Input Voltage VIN

Enable Input Voltage VEN

Switch Output Voltage VSW

Power Dissipation (On 4 Layer PCB, TA=25°C) PD

Thermal Resistance (Junction to Ambient, Simulation) θJA

Thermal Resistance (Junction to Case, Simulation) θJC

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.

STG

HBM

0 to 6.0

-0.3 to VIN+0.3

-0.3 to VIN+0.3

3

40

25.7

150

-40 to 85

-55 to 150

2000

200

V

V

V

W

°C/W

°C/W

°C

°C

°C

V

V

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Input Voltage VIN 2.5 5.5 V

Junction Temperature Range TJ -40 125 °C

Ambient Temperature Range TA -40 80 °C

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

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