AOZ1110QI Alpha & Omega Semiconductor Inc, AOZ1110QI Datasheet - Page 2

• Manufacturer Part Number: AOZ1110QI
• Description: IC BUCK SYNC ADJ 4A 24QFN
• Manufacturer: Alpha & Omega Semiconductor Inc
• Series: EZBuck™r
• Type: Step-Down (Buck), PWM - Current Moder

Specifications of AOZ1110QI

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 V ~ 5.5 V
• Current - Output: 4A
• Frequency - Switching: 500kHz, 1MHz
• Voltage - Input: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-WFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 785-1257-2

Ordering Information
Pin Configuration
Pin Description
Rev. 1.0 October 2010
13, 14, 15, 16, 17,
Part Number
Pin Number
AOZ1110QI
18, 19, 20
10, 11, 12
21, 22
8, 23
5,6
24
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit
1
2
3
4
7
9
www.aosmd.com/web/quality/rohs_compliant.jsp
Pin Name
Ambient Temperature Range
PGOOD
COMP
AGND
PGND
FSEL
VDD
VIN
NC
EN
SS
FB
LX
-40°C to +85°C
COMP
External loop compensation pin.
The FB pin is used to determine the output voltage via a resistor divider between the
output and GND.
Device enable pin, active high.
Power good signal output pin. It is an open drain logic output used to indicate the status of
output voltages. Connect a pull up resistor to VIN.
No connect.
Frequency Selection Pin. Tie this pin to ground, to set the switching frequency to 500kHz;
tie this pin to VDD, to set the switching frequency to 1MHz.
Electrically needs to be connected to PGND. Also used as thermal connection for
controller circuit.
Supply voltage to control circuit and gate drivers. Connect a 10Ω resistor between VIN
and VDD and a 0.1μF capacitor from VDD to AGND to decouple noise voltage.
Supply voltage input. All VIN pins must be connected together externally. When VIN
voltage rises above the UVLO threshold the device starts up.
PWM output connection to inductor. All LX pins must be connected together externally.
Also used as thermal connection for internal MOSFET.
Power ground. All PGND pins must be connected together. Electrically needs to be
connected to AGND.
Soft start pin. Connect a capacitor externally to control soft start period. Leave it open for
internal set soft-start time.
Reference connection for controller circuit. All AGND pins are connected internally.
EN
PG
NC
NC
FB
1
2
3
4
5
6
24
7
24-Pin 4mm x 4mm QFN
23
8
(Top View)
www.aosmd.com
22
9
10
21
11
20
19
12
24-pin 4mm x 4mm QFN
18
17
16
15
14
13
for additional information.
LX
LX
LX
LX
LX
LX
Package
Pin Function
Environmental
Green Product
AOZ1110
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