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UC2573J

更新时间： 2024-09-15 23:38:51

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UC2573J 数据手册

UC1573

UC2573

UC3573

Buck Pulse Width Modulator Stepdown Voltage Regulator

FEATURES

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 in-

ductor buck switching converter employing an external PMOS switch. The

block diagram consists of a precision reference, an error amplifier config-

ured 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 pres-

ent 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 50µA, making the UC3573

ideal for battery powered applications.

• Simple Single Inductor Buck PWM

Stepdown Voltage Regulation

• Drives External PMOS Switch

• Contains UVLO Circuit

• Includes Pulse-by-Pulse Current Limit

• Low 50µA Sleep Mode Current

BLOCK DIAGRAM

UDG-94106-1

SLUS346 - APRIL 1999

12 3 4 5

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型号	品牌	获取价格	描述	数据表
UC2573N	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Refgulator
UC2573NG4	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Refgulator
UC2577	TI	获取价格	Simple Step-Up Voltage Regulator
UC2577-ADJ	TI	获取价格	Simple Step-Up Voltage Regulator
UC2577D-12	TI	获取价格	6A SWITCHING REGULATOR, 62kHz SWITCHING FREQ-MAX, PSSO5, PLASTIC, TO-263, 5 PIN
UC2577D-15	TI	获取价格	6A SWITCHING REGULATOR, 62kHz SWITCHING FREQ-MAX, PSSO5, PLASTIC, TO-263, 5 PIN
UC2577T-12	ETC	获取价格	Current-Mode SMPS Controller
UC2577T-15	TI	获取价格	6A SWITCHING REGULATOR, 52kHz SWITCHING FREQ-MAX, PSFM5
UC2577T-ADJ	TI	获取价格	Simple Step-Up Voltage Regulator
UC2577TD-12	ETC	获取价格	Current-Mode SMPS Controller