AOZ1031AI Alpha & Omega Semiconductor Inc, AOZ1031AI Datasheet

IC BUCK SYNC ADJ 3A SO8

AOZ1031AI

Manufacturer Part Number
AOZ1031AI
Description
IC BUCK SYNC ADJ 3A SO8
Manufacturer
Alpha & Omega Semiconductor Inc
Series
EZBuck™r
Type
Step-Down (Buck), PWM - Current Moder
Datasheet

Specifications of AOZ1031AI

Featured Product
The AOZ103x Family Synchronous Buck Regulator
Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 V ~ 18 V
Current - Output
3A
Frequency - Switching
600kHz
Voltage - Input
4.5 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
785-1253-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AOZ1031AI
Manufacturer:
AOS
Quantity:
3 676
Part Number:
AOZ1031AI
Manufacturer:
AOS
Quantity:
20 000
General Description
The AOZ1031A is a high efficiency, easy to use, 3A
synchronous buck regulator. The AOZ1031A works from
4.5V to 18V input voltage range, and provides up to 3A of
continuous output current with an output voltage adjust-
able down to 0.8V.
The AOZ1031A comes in a SO-8 package and is rated
over a -40
range.
Typical Application
Rev. 1.6 March 2010
°
C to +85
°
C operating ambient temperature
VIN
Figure 1. 3.3V 3A Synchronous Buck Regulator
C1
22µF
R
C
C
C
EN
COMP
AGND
VIN
www.aosmd.com
AOZ1031
PGND
Features
Applications
4.5V to 18V operating input voltage range
Synchronous Buck: 80mΩ internal high-side switch
and 30mΩ internal low-side switch with integrated
schottky diode
High efficiency: up to 95%
Internal soft start
Output voltage adjustable to 0.8V
3A continuous output current
Fixed 600kHz PWM operation
Pulse skipping at light load for high efficiency over
entire load range
Cycle-by-cycle current limit
Pre-bias start-up
Short-circuit protection
Thermal shutdown
SO-8 package
Point of load DC/DC converters
LCD TV
Set top boxes
DVD/Blu-ray players/recorders
Cable modems
PCIe graphics cards
Telecom/Networking/Datacom equipment
LX
FB
EZBuck™ 3A Synchronous Buck Regulator
L1 4.7µH
R1
R2
AOZ1031AI
VOUT
C2, C3
22µF
Page 1 of 15

Related parts for AOZ1031AI

AOZ1031AI Summary of contents

Page 1

... Short-circuit protection Thermal shutdown SO-8 package Applications Point of load DC/DC converters LCD TV Set top boxes DVD/Blu-ray players/recorders Cable modems PCIe graphics cards Telecom/Networking/Datacom equipment C1 22µF VIN L1 4.7µH EN AOZ1031 LX COMP AGND PGND C C www.aosmd.com AOZ1031AI VOUT R1 C2, C3 22µF R2 Page ...

Page 2

... Enable pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the device. Do not leave it open Switching node. PWM output connection to inductor. Rev. 1.6 March 2010 Package -40°C to +85°C SO-8 for additional information. PGND VIN AGND COMP 4 5 SO-8 (Top View) Pin Function www.aosmd.com AOZ1031AI Environmental RoHS Compliant Green Product Page ...

Page 3

... The device is not guaranteed to operate beyond the Maximum Operating Ratings. Rating Supply Voltage (V +0.3V IN Output Voltage Range Ambient Temperature (T +0.3V IN Package Thermal Resistance SO-8 (Θ SO-8 (Θ Package Power Dissipation (P 25°C Ambient SO-8 www.aosmd.com AOZ1031AI VIN + ISen – Q1 Level + LX FET Driver Q2 PGND Parameter Rating ) 4.5V to 18V IN 0. -40° ...

Page 4

... V >1.2V OUT 25°C 0.788 A Off threshold On threshold 2 500 100 4.0 Off threhsold On threshold T rising J T falling 12V 12V www.aosmd.com AOZ1031AI Typ. Max. Units 18 V 4.1 V 3.7 V 1.6 2.5 mA μ 0.8 0.812 V 0 200 nA 0 100 mV 600 700 kHz % 9 % 500 μ 200 5 ...

Page 5

... Light Load (DCM) Operation 1us/div Start Up to Full Load 1ms/div 50% to 100% Load Transient 100us/div Rev. 1.6 March 2010 = 12V 3.3V unless otherwise specified. OUT www.aosmd.com AOZ1031AI Full Load (CCM) Operation 1us/div Short Circuit Protection 4ms/div Short Circuit Recovery 10ms/div Page ...

Page 6

... Thermal de-rating curves for SO-8 package part under typical input and output condition based on the evaluation board. 25°C ambient temperature and natural convection (air speed < 50LFM) unless otherwise specified. Derating Curves at 5V/6V Input Ambient Temperature (T Rev. 1.6 March 2010 AOZ1031AI Efficiency Efficiency (V 100 1. 1. ...

Page 7

... R1 with equation below. ⎛ ⎞ × ⎜ ⎟ ------ - V 0 ⎝ ⎠ Some standard value of R voltage values are listed in Table 1 on the next page. www.aosmd.com AOZ1031AI ( ) Usually, a design is started and most used output 1 2 Page ...

Page 8

... The relation between the input capacitor RMS current and voltage conversion ratio is calculated and shown in Figure 2 on the next page. It can be seen that when V half under the worst current stress. The IN IN worst current stress on C www.aosmd.com AOZ1031AI pin and IN ⎛ ⎞ × ...

Page 9

... ESR = For lower output ripple voltage across the entire operat- ing temperature range, X5R or X7R dielectric type of ceramic, or other low ESR tantalum are recommended to be used as output capacitors. www.aosmd.com AOZ1031AI ⎞ 1 ------------------------- + ⎠ × × Page ...

Page 10

... The compensation capacitor C make a zero. This zero is put somewhere close to the dominate pole f but lower than 1/5 of selected cross- P1 over frequency. C can is selected by: C 1.5 ----------------------------------- × × 2π www.aosmd.com AOZ1031AI , is located at: 3 and set the cross calcu and resistor R together C C Page ...

Page 11

... Make the current trace from LX pins the PGND as short as possible. 6. Pour copper plane on all unused board area and connect it to stable DC nodes, like VIN, GND or VOUT. 7. Keep sensitive signal trace far away form the LX 1.1 pins. ) Θ × JA www.aosmd.com AOZ1031AI Page ...

Page 12

... Rev. 1.6 March 2010 Figure 3. AOZ1031A (SO-8) PCB layout www.aosmd.com AOZ1031AI Page ...

Page 13

... E1 e 1.27 BSC e E 5.80 6.00 6. 0.25 — 0. 0.40 — 1.27 L θ θ 0° — 8° www.aosmd.com AOZ1031AI Seating Plane 0. θ Min. Nom. Max. 0.053 0.065 0.069 0.004 — 0.010 0.049 0.059 0.065 0.012 — 0.020 0.007 — 0.010 0.189 0.193 ...

Page 14

... 13.00 17.40 ø13.00 10.60 2.00 ±0.30 ±1.00 ±0.50 +0.50/-0.20 Components Tape Leader Tape Orientation in Pocket 500mm min. or 125 empty pockets www.aosmd.com AOZ1031AI See Note 3 Feeding Direction 4.00 2.00 0.25 ±0.10 ±0.10 ±0. — — — Page ...

Page 15

... Part Number Code FAY WLT Assembly Lot Code Year & Week Code 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. www.aosmd.com AOZ1031AI Page ...

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