TC2575-3.3VAT datasheet, PDF - EEWORLD Datasheet

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TC2575-3.3VAT: Description3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5, TO-220, 5 PIN; CategoryPower/power management The power supply circuit; File Size172KB，26 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com; Environmental Compliance

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TC2575-3.3VAT Overview

3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5, TO-220, 5 PIN

TC2575-3.3VAT Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	Microchip
Parts packaging code	SFM
package instruction	, SIP5,.1,67TB
Contacts	3
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	VOLTAGE-MODE
Maximum input voltage	40 V
Minimum input voltage	4.75 V
Nominal input voltage	12 V
JESD-30 code	R-PSFM-T5
JESD-609 code	e3
Number of functions	1
Number of terminals	5
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Maximum output current	3.2 A
Package body material	PLASTIC/EPOXY
Encapsulate equivalent code	SIP5,.1,67TB
Package shape	RECTANGULAR
Package form	FLANGE MOUNT
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
surface mount	NO
Switch configuration	BUCK
Maximum switching frequency	63 kHz
Temperature level	AUTOMOTIVE
Terminal surface	Matte Tin (Sn)
Terminal form	THROUGH-HOLE
Terminal pitch	1.7 mm
Terminal location	SINGLE
Maximum time at peak reflow temperature	NOT SPECIFIED

TC2575-3.3VAT Preview

TC2575

1.0A Step-Down Switching Regulator

FEATURES

3.3V, 5.0V, 12V, and Adjustable Output Versions

Adjustable Version Output Voltage Range of

1.23V to 37V

4% Max. Over Line and Load Conditions

Guaranteed 1.0 A Output Current

Wide Input Voltage Range; 4.75V to 40V

Requires Only 4 External Components

52kHz Fixed Frequency Internal Oscillator

TTL Shutdown Capability, Low Power Standby Mode

High Efficiency

Uses Readily Available Standard Inductors

Thermal Shutdown and Current Limit Protection

GENERAL DESCRIPTION

The TC2575 series of regulators are monolithic inte-

grated circuits ideally suited for easy and convenient design

of a step–down switching regulator (buck converter). All

circuits of this series are capable of driving a 1.0A load with

excellent line and load regulation. These devices are avail-

able in fixed output voltages of 3.3V, 5.0V, 12V, and

an adjustable output version.

These regulators were designed to minimize the num-

ber of external components to simplify the power supply

design. Standard series of inductors optimized for use with

the TC2575 are offered by several different inductor manu-

facturers.

Since the TC2575 converter is a switch-mode power

supply, its efficiency is significantly higher in comparison

with popular three-terminal linear regulators, especially with

higher input voltages. In many cases, the power dissipated

is so low, that no heatsinking is required or its size can be

reduced dramatically.

The TC2575 features include a guaranteed

±4%

toler-

ance on output voltage within specified input voltages and

output load conditions, and

±10%

on the oscillator frequency

(±2% over 0°C to +125°C). External shutdown is included,

featuring 80µA (typical) standby current. The output switch

includes cycle-by-cycle current limiting, as well as thermal

shutdown for full protection under fault conditions.

APPLICATIONS

Simple and High-Efficiency Step-Down

(Buck) Regulator

Efficient Pre–Regulator for Linear Regulators

On–Card Switching Regulators

Positive to Negative Converters (Buck–Boost)

Negative Step-Up Converters

Power Supply for Battery Chargers

PIN CONFIGURATIONS

5-Pin TO-220

ORDERING INFORMATION

Part

Number

TC2575-3.3VAT

TC2575-5.0VAT

TC2575-12.0VAT*

TC2575VAT**

Package

5-Pin TO-220

Temperature

Range

–40 to +125°C

TC2575

1 2 3 4 5

Note: * Contact factory for availability

** ADJ = 1.23 To 37V.

DS21398A

OUTPUT

GND

FEEDBACK

ON/OFF

TC2575-1 3/13/00

1.0A Step-Down Switching Regulator

TC2575

ABSOLUTE MAXIMUM RATINGS*

Maximum Supply Voltage ................................ V

= 45V

ON/OFF Pin Input Voltage ..................... –0.3V

≤

Output Voltage to Ground (Steady State) ............... –1.0 V

Max Power Dissipation(TO-220) ......... (Internally Limited)

Thermal Resistance, Junction-to-Ambient ..... 65°C/W

Thermal Resistance, Junction-to-Case ........ 5.0°C/W

Storage Temperature Range ................. –65°C to +150°C

Minimum ESD Rating ............................................. 3.0 kV

(Human Body Model: C = 100pF, R = 1.5kΩ)

Lead Temperature (Soldering, 10 seconds) .......... 260

°C

Maximum Junction Temperature............................. 150°C

Operating Junction Temperature Range .... –40 to +125*C

Supply Voltage ............................................................40V

*This is a stress rating only, and functional operation of the device at these

or any other conditions beyond those indicated in the operation section of

the specifications is not implied. Exposure to absolute maximum ratings

conditions for extended periods of time may affect device reliability.

ELECTRICAL CHARACTERISTICS:

(Unless otherwise specified, V

= 12V for the 3.3V, 5.0V, and Adjustable

version,V

= 25V for the 12V version. I

LOAD

= 200mA. For typical values T

= 25°C, for min/max values T

is the operating

junction temperature range that applies (Note 2), unless otherwise noted.

Symbol

OUT

Parameter

Output Voltage

Test Conditions

= 12V, I

LOAD

= 0.2A, T

= 25°C

4.75V

≤

40V, 0.2A

≤

LOAD

≤

1.0A

= 25°C

= –40°C to +125°

= 12V, I

LOAD

= 1.0A

= 12V, I

LOAD

= 0.2A, T

= 25°C

8.0V

≤

40V, 0.2A

≤

LOAD

≤

1.0A

= 25°C

= –40°C to +125°C

= 12V, I

LOAD

= 1.0 A

= 25V, I

LOAD

= 0.2A, T

= 25°C

15V

≤

40V, 0.2A

≤

LOAD

≤

1.0A

= 25°C

= –40°C to +125°C

= 15V, I

LOAD

= 1.0 A

= 12V, I

LOAD

= 0.2A, V

OUT

= 5.0V,

= 25°C

8.0V

≤

40V, 0.2A

≤

LOAD

≤

1.0A

OUT

= 5.0V

= 25°C

= –40°C to +125°C

= 12V, I

LOAD

= 1.0A, V

OUT

= 5.0V

Min

3.234

3.168

3.135

—

4.9

4.8

4.75

—

11.76

11.52

11.4

—

1.217

Typ

3.3

—

5.0

—

1.23

Max

3.366

3.432

3.465

—

5.1

5.2

5.25

—

12.24

12.48

12.6

—

1.243

Units

TC2575-3.3 [(Note 1) Test Circuit Figure 2]

OUT

Efficiency

Output Voltage

TC2575-5 [(Note 1)Test Circuit Figure 2]

OUT

Efficiency

Output Voltage

TC2575-12 [(Note 1) Test Circuit Figure 2]

Efficiency

Feedback Voltage

TC2575-Adjustable Version [(Note 1) Test Circuit Figure 2]

Efficiency

1.193

1.18

—

1.23

—

1.267

1.28

—

NOTES:

1. External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system

performance. When the TC2575 is used as shown in the Figure 2 test circuit, the system performance will be as

shown in the system parameters section of the Electrical Characteristics.

2. Tested junction temperature range for the TC2575: T

LOW

= –40°C T

HIGH

= +125°C

TC2575-1 3/13/00

DS21398A

1.0A Step-Down Switching Regulator

TC2575

ELECTRICAL CHARACTERISTICS:

(Unless otherwise specified, V

= 12V for the 3.3V, 5.0V, and Adjustable

version,V

= 25V for the 12V version. I

LOAD

= 200mA. For typical values T

= 25°C, for min/max values T

is the operat-

ing junction temperature range that applies (Note 2), unless otherwise noted.

Symbol

Parameter

Feedback Bias Current

Test Conditions

Min

Typ

Max

Units

TC2575-ALL OUTPUT VOLTAGE VERSIONS

OUT

= 5.0V (Adjustable Version Only)

= 25°C

= –40°C to +125°C

Oscillator Frequency (Note 3)

= 25°C

= 0 to +125°C

= –40 to +125°C

Saturation Voltage

OUT

= 1.0A, (Note 4)

= 25°C

= –40 to +125°C

Max Duty Cycle (“on”) [Note 5]

Current Limit Peak Current

(Notes 3 and 4)

= 25°C

= –40 to +125°C

Output Leakage Current

(Notes 6 and 7), T

= 25°C

Output = 0 V

Output = – 1.0 V

Quiescent Current (Note 6)

= 25°C

= –40 to +125°C

Standby Quiescent Current,

ON/OFF Pin = 5.0 V (“off”)

= 25°C

= –40 to +125°C

ON/OFF Pin Logic Input Level

(Test Figure 2)

OUT

= 0V

= 25°C

= –40 to +125°C

Nominal Output Voltage

OUT

= Nominal Output Voltage

= 25°C

= –40 to +125°C

ON/OFF Pin Input Current

(Test Figure 2)

ON/OFF Pin = 5.0V (“off”),

= 25°C

ON/OFF Pin Input Current

ON/OFF Pin = 0V (“on”),

= 25°C

—

1.7

1.4

—

1.0

—

2.3

—

0.8

6.0

5.0

—

100

200

—

1.2

1.3

—

3.0

3.2

2.0

9.0

µA

200

400

2.2

2.4

—

1.4

—

1.2

—

1.0

0.8

µA

5.0

µA

OSC

kHz

SAT

STBY

NOTES:

3. The oscillator frequency reduces to approximately 18kHz in the event of an output short or an overload which causes the regulated

output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power

dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.

4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin.

5. Feedback (Pin 4) removed from output and connected to 0V.

6. Feedback (Pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5.0V versions, and 25V for the 12V,

to force the output transistor "OFF".

7. V

= 40 V.

DS21398A

TC2575-1 3/13/00

1.0A Step-Down Switching Regulator

TC2575

PIN DESCRIPTION

Pin No.

5-Pin TO-220

Symbol

Description

This pin is the positive input supply for the TC2575 step-down

switching regulator. In order to minimize voltage transients and to

supply the switching currents needed by the regulator, a suitable

input bypass capacitor must be present (C

in Figure 1).

This is the emitter of the internal switch. The saturation voltage

SAT

of this output switch is typically 1.0V. It should be kept in

mind that the PCB area connected to this pin should be kept to a

minimum in order to minimize coupling to sensitive circuitry.

Circuit ground pin. See the information about the printed circuit

boad layout.

This pin senses regulated output voltage to complete the

feedback loop. The signal is divided by the internal resistor

divider network R2, R1 and applied to the non-inverting input of

the internal error amplifier. In the adjustable version of the

TC2575 switching regulator this pin is the direct input of the error

amplifier and the resistor network R2, R1 is connected externally

to allow programming of the output voltage.

It allows the switching regulator circuit to be shut down using

logic level signals, thus dropping the total input supply current to

approximately 80µA. The threshold voltage is typically 1.4V.

Applying a voltage above this value (up to +V

) shuts the

regulator off. If the voltage applied to this pin is lower than 1.4V

or if this pin is left open, the regulator will be in the "on" condition.

Output

GND

Feedback

ON/OFF

REPRESENTATIVE BLOCK DIAGRAM AND TYPICAL APPLICATION

+VIN

Unregulated

DC Input

CIN

TC2575

3.1V Internal

Regulator

ON/OFF

Output

Voltage Versions

Fixed gain

Error Amplifier

Current

Limit

Comparator

R2 (Ω)

Feedback

–

Driver

1.0k

–

Freq.

Shift

18kHz

1.235V

Band-Gap

Reference

–

Latch

3.3V

1.7k

5.0V

3.1k

12V

8.84k

15V

11.3k

For Adjustable version

R1 = open, R2 = 0Ω

Output

1.0 Amp

Switch

GND

Regulated

Output

VOUT

COUT

Load

52kHz

Oscillator

Reset

Thermal

Shutdown

TC2575-1 3/13/00

DS21398A

1.0A Step-Down Switching Regulator

TC2575

Feedback

7.0 – 40V

Unregulated

DC Input

+VIN

CIN

100µF

TC2575

3 GND

Output

5 ON/OFF

330µH

5.0V Regulated

Output 1.0A Load

1N5819

COUT

330µF

Figure 1. Block Diagram and Typical Application: Fixed Output Voltages

5.0 Output Voltage Versions

Feedback

VIN

Unregulated

DC Input

8.0 – 40V

CIN

100µF/50V

TC2575

(5V)

GND

Output

ON/OFF

330µH

COUT +

330µF/16V

IN5819

VOUT

Regulated

Output

Load

Adjustable Output Voltage Versions

Feedback

VIN

Unregulated

DC Input

8.0 – 40V

TC2575

Adjustable

GND

Output

ON/OFF

IN5819

330µH

VOUT

Regulated

Output

+ CIN

330µF/

16V

Load

CIN

100µF/50V

VOUT = VREF

(

1 + R1

)

R1= R2

(

VOUT - 1

)

VREF

Where VREF = 1.23V, R1

between 1.0kΩ and 5.0kΩ

Figure 2. Typical Test Circuit

DS21398A

TC2575-1 3/13/00

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TC2575-3.3VAT Related Products

	TC2575-3.3VAT	TC2575-5.0VAT
Description	3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5, TO-220, 5 PIN	3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5, TO-220, 5 PIN
Is it lead-free?	Lead free	Lead free
Is it Rohs certified?	conform to	conform to
Maker	Microchip	Microchip
Parts packaging code	SFM	SFM
package instruction	, SIP5,.1,67TB	, SIP5,.1,67TB
Contacts	3	3
Reach Compliance Code	compliant	compliant
ECCN code	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	VOLTAGE-MODE	VOLTAGE-MODE
Maximum input voltage	40 V	40 V
Minimum input voltage	4.75 V	8 V
Nominal input voltage	12 V	12 V
JESD-30 code	R-PSFM-T5	R-PSFM-T5
JESD-609 code	e3	e3
Number of functions	1	1
Number of terminals	5	5
Maximum operating temperature	125 °C	125 °C
Minimum operating temperature	-40 °C	-40 °C
Maximum output current	3.2 A	3.2 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
Encapsulate equivalent code	SIP5,.1,67TB	SIP5,.1,67TB
Package shape	RECTANGULAR	RECTANGULAR
Package form	FLANGE MOUNT	FLANGE MOUNT
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	NOT SPECIFIED
Certification status	Not Qualified	Not Qualified
surface mount	NO	NO
Switch configuration	BUCK	BUCK
Maximum switching frequency	63 kHz	63 kHz
Temperature level	AUTOMOTIVE	AUTOMOTIVE
Terminal surface	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	THROUGH-HOLE	THROUGH-HOLE
Terminal pitch	1.7 mm	1.7 mm
Terminal location	SINGLE	SINGLE
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED

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