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See Technical Specifications

UC2573D

Buck Pulse Width Modulator Stepdown Voltage Regulator

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UC2573D
Datasheet:

UC2573D Datasheet (PDF)
Output Type:

Transistor Driver
Function:

Step-Down
Output Configuration:

Positive
Topology:

Buck
EDA/CAD Models:

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UC2573D General Description

The UC3573 is a Buck pulse width modulator which steps down and regulates 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 present before any switching activity can occur, and a pulse-by-pulse current limit. Input current can be sensed and limited to a user determined maximum value. In addition, a sleep comparator interfaces to the UVLO circuit which turns the chip off when the input voltage is below the UVLO threshold. This reduces the supply current to only 50uA, making the UC3573 ideal for battery powered applications.

Key Features

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

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)DC DC Switching Controllers	Series	-
Output Type	Transistor Driver	Function	Step-Down
Output Configuration	Positive	Topology	Buck
Number of Outputs	1	Output Phases	1
Voltage - Supply (Vcc/Vdd)	4.75V ~ 30V	Frequency - Switching	100kHz
Duty Cycle (Max)	92%	Synchronous Rectifier	No
Clock Sync	No	Serial Interfaces	-
Control Features	Current Limit, Ramp	Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Base Product Number	UC2573
Product Category	Switching Controllers	Switching Frequency	200 kHz to 300 kHz
Duty Cycle - Max	-	Input Voltage	4.2 V to 35 V
Output Voltage	1.5 V to 30 V	Output Current	500 mA
Minimum Operating Temperature	- 40 C	Maximum Operating Temperature	+ 85 C
Mounting Style	SMD/SMT	Operating Supply Current	9 mA
Product Type	Switching Controllers	Shutdown	No Shutdown
Factory Pack Quantity	75	Subcategory	PMIC - Power Management ICs
Type	DC/DC Controller (External Switch)	Unit Weight	0.002561 oz