AOZ1034PI_3

AOZ1034PI_3 Datasheet

AOZ1034

Part	Datasheet
AOZ1034PI_3	AOZ1034PI_3 (pdf)

Related Parts	Information
AOZ1034PI_2	AOZ1034PI_2
AOZ1034DI_2	AOZ1034DI_2

PDF Datasheet Preview
AOZ1034 EZBuck 4A Synchronous Buck Regulator The AOZ1034 is a synchronous high efficiency, simple to use, 4A buck regulator. The AOZ1034 works from a 4.5V to 18V input voltage range, and provides up to 4A of continuous output current with an output voltage adjustable down to 0.8V. The AOZ1034 comes in both a 5x4 DFN-8 and an exposed pad SO-8 package and is rated over a -40°C to +85°C ambient temperature range. z 4.5V to 18V operating input voltage range z Synchronous rectification 60mΩ internal high-side switch and 20mΩ Internal low-side switch z High efficiency up to 95% z Internal soft start z Output voltage adjustable to 0.8V z 4A continuous output current z Fixed 500kHz PWM operation z Cycle-by-cycle current limit z Pre-bias start-up z Short-circuit protection z Thermal shutdown z Thermally enhanced 5x4 DFN-8 and exposed pad SO-8 packages z Point of load DC/DC conversion z PCIe graphics cards z Set top boxes z DVD drives and HDD z LCD panels z Cable modems z Telecom/Networking/Datacom equipment C1 22µF Ceramic RC CC EN AOZ1034 LX COMP AGND FB PGND L1 4.7µH VOUT R1 C2, C3 22µF Ceramic Figure 3.3V 4A Synchronous Buck Regulator Page 1 of 18 AOZ1034 Ordering Information Part Number AOZ1034DI AOZ1034PI Ambient Temperature Range -40°C to +85°C Package 5x4 DFN-8 Exposed Pad SO-8 Environmental Green Product AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information. Pin Configuration PGND 1 VIN 2 AGND 3 FB 4 LX GND 8 LX 7 LX 6 EN 5 COMP 5x4 DFN-8 Top View PGND 1 VIN 2 AGND 3 FB 4 PAD LX 8 NC 7 NC 6 EN 5 COMP Exposed Pad SO-8 Top View Pin Description Pin Number 5x4 DFN-8 Exposed Pad SO-8 Pin Name PGND VIN AGND COMP EN LX NC Pin Function Power ground. Electrically needs to be connected to AGND. Supply voltage input. When VIN rises above the UVLO threshold the device starts up. Reference connection for controller section. Also used as thermal connection for controller section. Electrically needs to be connected to PGND. The FB pin is used to determine the output voltage via a resistor divider between the output and GND. External loop compensation pin. The enable pin is active high. Connect it to VIN if not used and do not leave it open. PWM output connection to inductor. No Connect. Pin 7 and 8 are not internally connected. Connect these two pins externally to LX and use them for better thermal performance. Page 2 of 18 Block Diagram AOZ1034 UVLO 5V LDO

PDF Datasheet Preview

AOZ1034

EZBuck 4A Synchronous Buck Regulator

The AOZ1034 is a synchronous high efficiency, simple to use, 4A buck regulator. The AOZ1034 works from a 4.5V to 18V input voltage range, and provides up to 4A of continuous output current with an output voltage adjustable down to 0.8V.

The AOZ1034 comes in both a 5x4 DFN-8 and an exposed pad SO-8 package and is rated over a -40°C to +85°C ambient temperature range.
z 4.5V to 18V operating input voltage range z Synchronous rectification 60mΩ internal high-side
switch and 20mΩ Internal low-side switch z High efficiency up to 95% z Internal soft start z Output voltage adjustable to 0.8V z 4A continuous output current z Fixed 500kHz PWM operation z Cycle-by-cycle current limit z Pre-bias start-up z Short-circuit protection z Thermal shutdown z Thermally enhanced 5x4 DFN-8 and exposed pad

SO-8 packages
z Point of load DC/DC conversion z PCIe graphics cards z Set top boxes z DVD drives and HDD z LCD panels z Cable modems z Telecom/Networking/Datacom equipment

C1 22µF Ceramic

RC CC

EN AOZ1034 LX

COMP AGND

FB PGND

L1 4.7µH

VOUT

R1 C2, C3 22µF Ceramic

Figure 3.3V 4A Synchronous Buck Regulator

Page 1 of 18

AOZ1034
Ordering Information

Part Number AOZ1034DI AOZ1034PI

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

Package 5x4 DFN-8 Exposed Pad SO-8

Environmental Green Product

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

Pin Configuration

PGND 1 VIN 2

AGND 3 FB 4

LX GND
8 LX 7 LX 6 EN 5 COMP
5x4 DFN-8

Top View

PGND 1 VIN 2

AGND 3 FB 4

PAD LX
8 NC 7 NC 6 EN 5 COMP

Exposed Pad SO-8

Top View

Pin Description

Pin Number
5x4 DFN-8

Exposed Pad SO-8

Pin Name PGND VIN

AGND

COMP EN

LX NC

Pin Function

Power ground. Electrically needs to be connected to AGND.

Supply voltage input. When VIN rises above the UVLO threshold the device starts up.

Reference connection for controller section. Also used as thermal connection for controller section. Electrically needs to be connected to PGND.

The FB pin is used to determine the output voltage via a resistor divider between the output and GND.

External loop compensation pin.

The enable pin is active high. Connect it to VIN if not used and do not leave it open.

PWM output connection to inductor.

No Connect. Pin 7 and 8 are not internally connected. Connect these two pins externally to LX and use them for better thermal performance.

Page 2 of 18

Block Diagram

AOZ1034

UVLO
5V LDO

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Datasheet ID: AOZ1034PI_3 516305