AOZ1037PI_2

AOZ1037PI_2 Datasheet

AOZ1037

Part	Datasheet
AOZ1037PI_2	AOZ1037PI_2 (pdf)

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AOZ1037 EZBuck 5A Synchronous Buck Regulator The AOZ1037 is a high efficiency, simple to use, 5A synchronous buck regulator. The AOZ1037 works from a 4.5V to 18V input voltage range, and provides up to 5A of continuous output current with an output voltage adjustable down to 0.8V. The AOZ1037 comes in an exposed pad SO-8 packages and is rated over a -40°C to +85°C ambient temperature range. z to 18V operating input voltage range z Synchronous rectification internal high-side switch and Internal low-side switch z High efficiency up to 95% z Internal soft start z Active high power good state z Output voltage adjustable to 0.8V z 5A 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 Exposed pad SO-8 package z Point of load DC/DC conversion z LCD TVs z Set top boxes z DVD / Blu-ray players/recorders z Cable modems z PCIe graphics cards z Telecom/Networking/Datacom equipment C1 22µF RC CC 5V R3 PGOOD AOZ1037 LX COMP AGND PGND L1 4.7µH R1 R2 VOUT C2, C3 22µF Figure 3.3V/5A Synchronous Buck Regulator Page 1 of 14 Ordering Information Part Number AOZ1037PI Ambient Temperature Range -40°C to +85°C Package EPAD SO-8 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 PAD LX 8 NC 7 PGOOD 6 EN 5 COMP Exposed Pad SO-8 Top View AOZ1037 Environmental Green Product Pin Description Pin Number 1 2 3 4 5 6 7 8 Pin Name Pin Function PGND VIN AGND FB COMP EN PGOOD NC LX Power ground. PGND needs to be electrically connected to AGND. Supply voltage input. When VIN rises above the UVLO threshold and EN is logic high, the device starts up. Analog ground. AGND is the reference point for controller section. AGND needs to be electrically connected to PGND. Feedback input. The FB pin is used to set the output voltage via a resistor divider between the output and AGND. External loop compensation pin. Connect a RC network between COMP and AGND to compensate the control loop. Enable pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the device. if on/off control is not needed, connect it to VIN and do not leave it open. Power Good Output. PGOOD is an open-drain output that indicates the status of output voltage. PGOOD is pulled low when output is below 90% of the normal regulation. No Connect. Pin 8 is not internally connected. Switching node. LX is the drain of the internal PFET. LX is used as the thermal pad of the power stage. Page 2 of 14 Block Diagram AOZ1037 UVLO 5V LDO Internal & POR Regulator Reference & Bias Softstart ILimit

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AOZ1037

EZBuck 5A Synchronous Buck Regulator

The AOZ1037 is a high efficiency, simple to use, 5A synchronous buck regulator. The AOZ1037 works from a 4.5V to 18V input voltage range, and provides up to 5A of continuous output current with an output voltage adjustable down to 0.8V.

The AOZ1037 comes in an exposed pad SO-8 packages and is rated over a -40°C to +85°C ambient temperature range.
z to 18V operating input voltage range
z Synchronous rectification internal high-side switch and Internal low-side switch
z High efficiency up to 95% z Internal soft start z Active high power good state z Output voltage adjustable to 0.8V z 5A 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 Exposed pad SO-8 package
z Point of load DC/DC conversion z LCD TVs z Set top boxes z DVD / Blu-ray players/recorders z Cable modems z PCIe graphics cards z Telecom/Networking/Datacom equipment

C1 22µF

RC CC
5V R3

PGOOD

AOZ1037 LX

COMP

AGND

PGND

L1 4.7µH R1 R2

VOUT

C2, C3 22µF

Figure 3.3V/5A Synchronous Buck Regulator

Page 1 of 14
Ordering Information

Part Number AOZ1037PI

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

Package EPAD SO-8

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

PAD LX
8 NC 7 PGOOD 6 EN 5 COMP

Exposed Pad SO-8

Top View

AOZ1037

Environmental Green Product

Pin Description

Pin Number 1 2 3 4 5 6 7 8

Pin Name

Pin Function

PGND VIN

AGND FB

COMP EN

PGOOD NC LX

Power ground. PGND needs to be electrically connected to AGND.

Supply voltage input. When VIN rises above the UVLO threshold and EN is logic high, the device starts up.

Analog ground. AGND is the reference point for controller section. AGND needs to be electrically connected to PGND.

Feedback input. The FB pin is used to set the output voltage via a resistor divider between the output and AGND.

External loop compensation pin. Connect a RC network between COMP and AGND to compensate the control loop.

Enable pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the device. if on/off control is not needed, connect it to VIN and do not leave it open. Power Good Output. PGOOD is an open-drain output that indicates the status of output voltage. PGOOD is pulled low when output is below 90% of the normal regulation.

No Connect. Pin 8 is not internally connected.

Switching node. LX is the drain of the internal PFET. LX is used as the thermal pad of the power stage.

Page 2 of 14

Block Diagram

AOZ1037

UVLO
5V LDO

Internal
& POR

Regulator

Reference & Bias

Softstart

ILimit

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Datasheet ID: AOZ1037PI_2 516307