AOZ1233QI-01_3

AOZ1233QI-01_3 Datasheet

AOZ1233-01

Part	Datasheet
AOZ1233QI-01_3	AOZ1233QI-01_3 (pdf)

Related Parts	Information
AOZ1233QI-01_2	AOZ1233QI-01_2

PDF Datasheet Preview
AOZ1233-01 28V/8A Synchronous EZBuckTM Regulator The AOZ1233-01 is a high-efficiency, easy-to-use DC/DC synchronous buck regulator that operates up to 28V. The device is capable of supplying 8A of continuous output current with an output voltage adjustable down to 0.8V The AOZ1233-01 integrates an internal linear regulator to generate 5.3V VCC from input. If input voltage is lower than 5.3V, the linear regulator operates at low dropoutput mode, which allows the VCC voltage is equal to input voltage minus the drop-output voltage of the internal linear regulator. A proprietary constant on-time PWM control with input feed-forward results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input voltage range. The switching frequency can be externally programmed up to 1MHz. The device features multiple protection functions such as VCC under-voltage lockout, cycle-by-current limit, output over-voltage protection, short-circuit protection, as well as thermal shutdown. The AOZ1233-01 is available in a 5mm x 5mm QFN-30L package and is rated over a -40°C to +85°C ambient temperature range. Wide input voltage range 2.7V to 28V 8A continuous output current Output voltage adjustable down to 0.8V Low RDS ON internal NFETs high-side low-side SRFET Constant On-Time with input feed-forward Programmable frequency up to 1MHz Internal 5.3V/20mA linear regulator Ceramic capacitor stable Adjustable soft start Power Good output Integrated bootstrap diode Cycle-by-cycle current limit Short-circuit protection Thermal shutdown Thermally enhanced 5mm x 5mm QFN-30L package Portable computers Compact desktop PCs Servers Graphics cards Set-top boxes LCD TVs Cable modems Point-of-load DC/DC converters Page 1 of 17 Typical Application for VIN = 12V or above Input = 12V or above C2 22uF 100kΩ 1uF Power Good Off On IN AIN VCC TON BST AOZ1233-01 PGOOD EN FB SS CSS AGND PGND RTON C5 0.1uF L1 R1 R2 Analog Ground Power Ground Typical Application for VIN = 5V Input = 5V C2 22uF 100kΩ 1uF Power Good Off On IN AIN VCC TON BST AOZ1233-01 PGOOD EN FB AGND PGND Ordering Information Part Number AOZ1233QI-01 Ambient Temperature Range -40°C to +85°C Package 30-Pin 5mm x 5mm QFN AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information. Environmental Green Product Page 3 of 17 Pin Configuration AOZ1233-01 SS AGND VCC BST PGND LX PGOOD 1 EN 2 PFM 3 AGND 4 TON 6 AIN 7 30 29 28 27 26 25 24 23 22 LX 21 LX AGND 20 LX 19 PGND 18 PGND 17 PGND 16 PGND 15 PGND 8 9 10 11 12 13 14 IN PGND 30-pin 5mm x 5mm QFN Top View Pin Description Pin Number Pin Name PGOOD 3 4, 29 5 6 7 8, 9, 10, 11 12, 13, 14, 15, 16, 17, 18, 19, 26 20, 21, 22, 23, 24, 25 EN PFM AGND FB TON AIN IN PGND VCC SS Pin Function Power Good Signal Output. PGOOD is an open-drain output used to indicate the status of the output voltage. It is internally pulled low when the output voltage is 10% lower than the nominal regulation voltage for 50µs typical time or 15% higher than the nominal regulation voltage. PGOOD is pulled low during soft-start and shut down. Enable Input. The AOZ1233-01 is enabled when EN is pulled high. The device shuts down when EN is pulled low. PFM Selection Input. Connect PFM pin to VCC/VIN for forced PWM operation. Connect PFM pin to ground for PFM operation to improve light load efficiency. Analog Ground. Feedback Input. Adjust the output voltage with a resistive voltage-divider between the regulator’s output and AGND. On-Time Setting Input. Connect a resistor between VIN and TON to set the on time. Supply Input for analog functions. Supply Input. IN is the regulator input. All IN pins must be connected together. Power Ground. Switching Node. Bootstrap Capacitor Connection. The AOZ1233-01 includes an internal bootstrap diode. Connect an external capacitor between BST and LX as shown in the Typical Application diagrams. Output for internal linear regulator. Bypass VCC to AGND with a 1µF ceramic capacitor. Place the capacitor close to VCC pin. Soft-Start Time Setting Pin. Connect a capacitor between SS and AGND to set the soft-start time.

PDF Datasheet Preview

AOZ1233-01
28V/8A Synchronous EZBuckTM Regulator

The AOZ1233-01 is a high-efficiency, easy-to-use DC/DC synchronous buck regulator that operates up to 28V. The device is capable of supplying 8A of continuous output current with an output voltage adjustable down to 0.8V

The AOZ1233-01 integrates an internal linear regulator to generate 5.3V VCC from input. If input voltage is lower than 5.3V, the linear regulator operates at low dropoutput mode, which allows the VCC voltage is equal to input voltage minus the drop-output voltage of the internal linear regulator.

A proprietary constant on-time PWM control with input feed-forward results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input voltage range. The switching frequency can be externally programmed up to 1MHz.

The device features multiple protection functions such as VCC under-voltage lockout, cycle-by-current limit, output over-voltage protection, short-circuit protection, as well as thermal shutdown.

The AOZ1233-01 is available in a 5mm x 5mm QFN-30L package and is rated over a -40°C to +85°C ambient temperature range.

Wide input voltage range 2.7V to 28V
8A continuous output current Output voltage adjustable down to 0.8V Low RDS ON internal NFETs
high-side low-side SRFET Constant On-Time with input feed-forward Programmable frequency up to 1MHz Internal 5.3V/20mA linear regulator Ceramic capacitor stable Adjustable soft start Power Good output Integrated bootstrap diode Cycle-by-cycle current limit Short-circuit protection Thermal shutdown Thermally enhanced 5mm x 5mm QFN-30L package

Portable computers Compact desktop PCs Servers Graphics cards Set-top boxes LCD TVs Cable modems Point-of-load DC/DC converters

Page 1 of 17

Typical Application for VIN = 12V or above

Input = 12V or above

C2 22uF
100kΩ 1uF

Power Good

Off On

IN AIN VCC

TON BST

AOZ1233-01

PGOOD

EN FB

SS CSS

AGND PGND

RTON C5 0.1uF

L1 R1 R2

Analog Ground Power Ground

Typical Application for VIN = 5V

Input = 5V

C2 22uF
100kΩ 1uF

Power Good

Off On

IN AIN VCC

TON BST

AOZ1233-01

PGOOD

EN FB

AGND

PGND
Ordering Information

Part Number AOZ1233QI-01

Ambient Temperature Range -40°C to +85°C

Package 30-Pin 5mm x 5mm QFN

AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information.

Environmental Green Product

Page 3 of 17

Pin Configuration

AOZ1233-01

SS AGND VCC BST PGND LX

PGOOD 1 EN 2

PFM 3 AGND 4

TON 6 AIN 7
30 29 28 27 26 25 24 23
22 LX
21 LX

AGND
20 LX
19 PGND
18 PGND
17 PGND
16 PGND
15 PGND
8 9 10 11
12 13 14

IN PGND
30-pin 5mm x 5mm QFN Top View

Pin Description

Pin Number

Pin Name

PGOOD
3 4, 29
5 6 7 8, 9, 10, 11 12, 13, 14, 15, 16, 17, 18, 19, 26 20, 21, 22, 23, 24, 25

EN PFM AGND FB TON AIN

IN PGND

VCC SS

Pin Function

Power Good Signal Output. PGOOD is an open-drain output used to indicate the status of the output voltage. It is internally pulled low when the output voltage is 10% lower than the nominal regulation voltage for 50µs typical time or 15% higher than the nominal regulation voltage. PGOOD is pulled low during soft-start and shut down. Enable Input. The AOZ1233-01 is enabled when EN is pulled high. The device shuts down when EN is pulled low. PFM Selection Input. Connect PFM pin to VCC/VIN for forced PWM operation. Connect PFM pin to ground for PFM operation to improve light load efficiency. Analog Ground. Feedback Input. Adjust the output voltage with a resistive voltage-divider between the regulator’s output and AGND. On-Time Setting Input. Connect a resistor between VIN and TON to set the on time. Supply Input for analog functions. Supply Input. IN is the regulator input. All IN pins must be connected together.

Power Ground.

Switching Node.

Bootstrap Capacitor Connection. The AOZ1233-01 includes an internal bootstrap diode. Connect an external capacitor between BST and LX as shown in the Typical Application diagrams. Output for internal linear regulator. Bypass VCC to AGND with a 1µF ceramic capacitor. Place the capacitor close to VCC pin. Soft-Start Time Setting Pin. Connect a capacitor between SS and AGND to set the soft-start time.

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Datasheet ID: AOZ1233QI-01_3 516315