UC3573N Datasheet

IC型號(hào)：
UC3573N
PDF描述：
IC-BUCK PWM STEPDOWN REGULATOR
文件大?。?/label>
248.64KB
PDF頁(yè)數(shù)：
4頁(yè)
芯片廠家：
ETC

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UC1573

UC2573

UC3573

Buck Pulse Width Modulator Stepdown Voltage Regulator

FEATURES

鈥?/div>

Simple Single Inductor Buck

PWM Stepdown Voltage

Regulation

Drives External PMOS Switch

Contains UVLO Circuit

Includes Pulse-by-Pulse Current

Limit

Low 50碌A(chǔ) Sleep Mode Current

DESCRIPTION

The UC3573 is a Buck pulse width modulator which steps down and regu-

lates a positive input voltage. The chip is optimized for use in a single

inductor buck switching converter employing an external PMOS switch.

The block diagram consists of a precision reference, an error amplifier

configured for voltage mode operation, an oscillator, a PWM comparator

with latching logic, and a 0.5A peak gate driver. The UC3573 includes an

undervoltage lockout circuit to insure sufficient input supply voltage is pre-

sent before any switching activity can occur, and a pulse-by-pulse current

limit. Input current can be sensed and limited to a user determined maxi-

mum value. In addition, a sleep comparator interfaces to the UVLO circuit

which turns the chip off when the input voltage is below the UVLO thresh-

old. This reduces the supply current to only 50碌A(chǔ), making the UC3573

ideal for battery powered applications.

鈥?/div>

BLOCK DIAGRAM

UDG-94106-1

9/96

標(biāo)準(zhǔn)包裝
50
類別
集成電路 (IC)
家庭
PMIC - 穩(wěn)壓器 - DC DC 切換控制器
系列
-
PWM 型
電壓模式
輸出數(shù)
1
頻率 - 最大
115kHz
占空比
96%
電源電壓
4.2 V ~ 35 V
降壓
是
升壓
無
回掃
無
反相
無
倍增器
無
除法器
無
Cuk
無
隔離
無
工作溫度
0°C ~ 70°C
封裝/外殼
8-DIP（0.300"，7.62mm）
包裝
管件
其它名稱
296-11225-5

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UC3573N Datasheet

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