Datasheet > AOZ3024PI

AOZ3024PI

更新时间： 2024-01-27 02:51:33

品牌	Logo	应用领域
美国万代 - AOS		稳压器
页数	文件大小	规格书
14页	550K
描述
EZBuckâ¢ 3 A Synchronous Buck Regulator

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中文翻译

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数据手册

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AOZ3024PI 数据手册

AOZ3024PI

Efficiency

Efficiency (V_IN= 12V, L = 4.7µH) vs. Load Current

100

5V OUTPUT

3.3V OUTPUT

1.8V OUTPUT

1.2V OUTPUT

0.5

1.0

1.5

2.0

2.5

3.0

Load Current (A)

Detailed Description

The AOZ3024PI is a current-mode step down regulator

Power Good

with an integrated high-side PMOS switch and a low-side

NMOS switch. The AOZ3024PI operates from a 4.5 V to

18 V input voltage range and supplies up to 3 A of load

current. Features include enable control, power-on reset,

input under voltage lockout, output over voltage

The Power Good output is an open drain N-channel

MOSFET which supplies an active-high power good

stage. A pull-up resistor should connect this pin to a DC

power trail with maximum voltage of 6 V. The AOZ3024PI

also monitors the FB voltage. When the FB voltage is

lower than 90 % of the normal voltage, the N-channel

MOSFET turns on and the Power Good pin is pulled low,

this indicates the power is abnormal.

protection, external soft-start and thermal shut down.

The AOZ3024PI is available in an exposed pad SO-8

package.

Steady-State Operation

Enable and Soft Start

Under heavy load steady-state conditions, the converter

operates in fixed frequency and Continuous-Conduction

Mode (CCM).

The AOZ3024PI has an internal soft start feature to limit

in-rush current and ensure the output voltage ramps up

smoothly to regulation voltage. The soft start process

begins when the input voltage rises to 4.1 V and voltage

on the EN pin is HIGH. In the soft start process, the

output voltage is typically ramped to regulation voltage in

4.5ms. The 4.5ms soft start time is set internally.

The AOZ3024PI integrates an internal P-MOSFET as the

high-side switch. Inductor current is sensed by amplifying

the voltage drop across the drain to source of the high

side power MOSFET. Output voltage is divided down by

the external voltage divider at the FB pin. The difference

of the FB pin voltage and reference voltage is amplified

by the internal transconductance error amplifier. The

error voltage, which shows on the COMP pin, is

compared against the current signal, which is the sum of

inductor current signal and ramp compensation signal, at

the PWM comparator input. If the current signal is less

than the error voltage, the internal high-side switch is on.

The EN pin of the AOZ3024PI is active high. Connect the

EN pin to VIN if the enable function is not used. Pulling

EN to ground will disable the AOZ3024PI. Do not leave

EN open. The voltage on the EN pin must be above 2 V

to enable the AOZ3024PI. When the EN pin voltage falls

below 0.6 V, the AOZ3024PI is disabled.

Rev. 1.0 November 2013

www.aosmd.com

Page 6 of 14

1...3 4 567 8 9...14

中文翻译

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