GM7230-3.3B5T datasheet, PDF - EEWORLD Datasheet

GM7230

150KHz, 3A STEP DOWN VOLTAGE

SWITCHING REGULATORS

Description

GM7230 series is designed to provide all the

active function for a

step-down (buck) switching

regulator, and drives a maximum load current as

high as 2A

line and load regulations. GM7230 is

available

in fixed output voltages of 3.3V, 5V,

and a versatile Adjustable output version.

These regulators are simple to use and require

minimum number of external components. The

features include internal frequency compensation

and a fixed-frequency oscillator.

The GM7230 is high-efficiency replacements for

popular

three-terminal linear regulators, and is

requiring a smaller heat sink or even no need

heat sink.

GM7230 performs well with standard inductors

from most

of manufacturers, and simplifying the

design of switch-mode

power supplies.

External

shutdown is included with 80 µA (typical) standby

current. The output switch has cycle-by-cycle

current limiting as well as thermal shutdown for

full protection under fault conditions.

GM7230 operates at a switching frequency of

150 kHz which

allowing smaller size filter

components than what would be needed with

lower frequency switching regulators.

GM7230 series are available in a standard 5-lead

TO-220, TO220B and TO263 packages.

Features

3.3V, 5V, 12Vand Adjustable output

versions

Adjustable version output voltage range

1.23V to 37V

V

OUT

accuracy is to

±

2% under specified

input voltage the output load conditions

Input voltage range up to 40V

Requires only 4 external components with

High efficiency

TTL shutdown capability, low power

standby mode

Built-in thermal shutdown, current limit

protection

Uses standard inductors

150 kHz fixed frequency internal oscillator

Application

Pre-regulator for linear regulators

High-efficiency step-down buck regulator

On-card/board switching regulators

Positive to negative converter (buck-boost)

LCD Monitors

Typical Application Circuits

GM7230-5.0

Unregulated

DC Input

Feedback

1

V

IN

Output

2

C

IN

680µF

GND

3

ON/OFF

5

D1

1N5824

C

OUT

220µF

4

L1

68µH

5V

regulated

outpu

t,

www.gammamicro.com.tw

GM7230

V1.10

1

GM7230

150KHz, 3A STEP DOWN VOLTAGE

SWITCHING REGULATORS

Marking Information and Pin Configurations (Top View)

TO-220-5

TO-220B-5

TO-263-5

GM7230

VVAYWW

GM7230

VVAYWW

GM7230

VVAYWW

1. V

IN

2. Output

4. Feedback

3. GND

5. ON/OFF

1. V

IN

2. Output

4. Feedback

3. GND

5. ON/OFF

1. V

IN

VV: Voltage suffix (15 = 1.5V, 50 = 5.0V…A = Adj)

A: Assembly / Test site code

Y: Year

WW: Week

2. Output

4. Feedback

3. GND

5. ON/OFF

GM7230

V1.10

2

GM7230

150KHz, 3A STEP DOWN VOLTAGE

SWITCHING REGULATORS

Ordering Information

Ordering Number

GM7230-ATA5T

GM7230-ATA5R

GM7230-ATB5T

GM7230-ATB5BT

GM7230-3.3TA5T

GM7230-3.3A5R

GM7230-3.3B5T

GM7230-3.3B5BT

GM7230-5.0TA5T

GM7230-5.0A5R

GM7230-5.0B5T

GM7230-12B5BT

GM7230-12TA5T

GM7230-12A5R

GM7230-12B5T

GM7230-12B5BT

12

5.0

3.3

Adj

Output Voltage

Package

TO-263-5

TO-220-5

TO-220-5B

TO-263-5

TO-220-5

TO-220-5B

TO-263-5

TO-220-5

TO-220-5B

TO-263-5

TO-220-5

TO-220-5B

Shipping

50 Units / Tube

800 Units / Reel

50 Units / Tube

800 Units / Reel

50 Units / Tube

800 Units / Reel

50 Units / Tube

800 Units / Reel

50 Units / Tube

GM7230

V1.10

3

GM7230

150KHz, 3A STEP DOWN VOLTAGE

SWITCHING REGULATORS

Absolute Maximum Ratings

(Note 1)

Rating

Maximum Supply Voltage

SD Pin Input Voltage / Feed Back Pin Voltage

Output Voltage to Ground (Steady State)

Power Dissipation

Thermal Resistance – Junction to Ambient (θ

JA

)

Storage Temperature Range

Maximum Junction Temperature

Operating Temperature Range

Minimum EDS Rating (Note 2)

Lead Temperature (Soldering, 10 sec)

** 2 square inch of FR-4, double sided, 1oz. minimum copper weight, is

recommended

Value

45

-0.3 + V

IN

+ 0.3

-0.3 + V

IN

+ 0.3

Internally Limited

36

- 65 to 150

+ 150

- 40 to 125

2

+ 260

Unit

V

-

℃/W

℃

kV

℃

Block Diagram

SD

V

IN

Current

Source

Bias

1.235V

Reference

2.5V

Reference

Start UP

COMP

2.5V

Current

Limit

COMP

GM

R2

AMP

COMP

R1 = 2.5K

Reset

Freq. Shift

150KHz

OSC

Thermal

Limit

OUTPUT

Latch

Driver

2A

Switch

220mV

220

For 3.3V, R2 = 4.2K

For 5.0V, R2 = 7.6K

For Adj, R2 = 0 and R1 = OPEN

GND

GM7230

V1.10

4

GM7230

150KHz, 3A STEP DOWN VOLTAGE

SWITCHING REGULATORS

Electrical Characteristics: GM7230-ADJ

(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature

rage

)

Parameter

Output Voltage

Efficiency

Condition

4.5V

<

V

IN

<

40V, 0.2A

<

I

LOAD

<

2A

V

IN

=12V, I

LOAD

=2.0A, V

OUT

= 3V

Symbol

V

OUT

η

Min

1.193

1.180

Typ

1.230

88

Max

1.267

1.280

Unit

V

%

Electrical Characteristics: GM7230-3.3

(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature

rage)

Parameter

Output Voltage

Efficiency

Condition

4.75V

<

V

IN

<

40V, 0.2A

<

I

LOAD

<

2A

V

IN

=12V, I

LOAD

=2.0A

Symbol

V

OUT

η

Min

3.168

3.135

Typ

3.300

73

Max

3.432

3.465

Unit

V

%

Electrical Characteristics: GM7230-5.0

(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature

rage)

Parameter

Output Voltage

Efficiency

Condition

7V

<

V

IN

<

40V, 0.2A

<

I

LOAD

<

2A

V

IN

=12V, I

LOAD

=2.0A

Symbol

V

OUT

η

Min

4.800

4.7500

Typ

5.000

80

Max

5.200

5.250

Unit

V

%

Electrical Characteristics: GM7230-12

(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature

rage)

Parameter

Output Voltage

Efficiency

Condition

15V

<

V

IN

<

40V, 0.5A

<

I

LOAD

<

3A

V

IN

=15V, I

LOAD

=3.0A

Symbol

V

OUT

η

Min

11.52

11.40

Typ

12.00

88

Max

12.48

12.60

Unit

V

%

GM7230

V1.10

5

GM7230-3.3B5T

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