Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

· Tel 201-432-0463 · Fax 201-432-9542 · www.belfuse.com

NON-ISOLATED DC/DC CONVERTERS

4.5V-32V Input

1.2V-5.0V/3A Output

· Non-Isolated

· Remote

On/Off

· High

Efficiency

· Input Under Voltage Lockout

· High Power Density

· OCP/SCP

· Excellent Thermal Performance

· Low

Cost

Description

The Bel x7AH-03Hxx0 is part of the low cost non-isolated DC/DC power converter series. It is packaged in a
compact, overmolded package rated at 3A. Optional lead forming provides a vertical mount product for minimal
footprint or a surface mount option for a very low profile. The output is closely regulated and the efficiency of
3.3V output is typically 90% at full load. Typical features include remote on/off, input under voltage lockout, over
current protection and short circuit protection.

Part Selection

Output

Voltage

Input

Voltage

Max. Output

Current

Max. Output

Power

Typical

Efficiency

Part Number

Surface Mount

Part Number

Vertical Mount

5.0V

8.0V 32V

15W

92%

S7AH-03H500

V7AH-03H500

3.3V

4.9V 32V

10W 90%

S7AH-03H330

V7AH-03H330

2.5V 4.5V

32V

7.5W 88%

S7AH-03H250

V7AH-03H250

1.8V 4.5V

32V

3A 5.4W

85%

S7AH-03H180

V7AH-03H180

1.5V

4.5V 32V

4.5W 83%

S7AH-03H150

V7AH-03H150

1.2V

4.5V 32V

3.6W

81%

S7AH-03H120

V7AH-03H120

Note:

Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "R" for "Reel

Packaging", and "G" for "Tray Packaging".

Absolute Maximum Ratings

Parameter

Min

Typ

Max

Notes

Input Voltage (continuous)

-0.3V

34V

Output Enable Terminal Voltage

-0.3V

12V

Ambient Temperature

-40

°C

Storage Temperature

-40

°C

125

°C

Input Specifications

Parameter

Min

Typ

Max

Notes

Input Voltage

4.5V

32V

See "Part Selection" for more details.

Input Current (no load)

30mA

Input Current (full load)

Remote Off Input Current

4mA

Input Reflected Ripple Current
(pk-pk)

- 200mA

400mA

Input Reflected Ripple Current
(RMS)

- 100mA

150mA

Tested with simulated source impedance
of 500nH, 5Hz to 20MHz and two
100uF/50V electrolytic capacitors and a
3.3uF/50V ceramic capacitor at the input.

t Inrush Current Transient

0.02A

s 0.1A

Turn on Voltage Threshold

- 4.1V

4.5V

Turn off Voltage Threshold

- 3.3V

4.0V

Notes:

1. The max Turn on Voltage threshold of the 3.3V & 5.0V output module will be relaxed to 4.9V & 8.0V

respectively.

2. The max Turn off Voltage threshold of the 3.3V output module will be relaxed to 4.5V. The 5.0V output

module does not have such function.

x7AH-03H Series

Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

· Tel 201-432-0463 · Fax 201-432-9542 · www.belfuse.com

NON-ISOLATED DC/DC CONVERTERS

4.5V-32V Input

1.2V-5.0V/3A Output

Output Specifications

Parameter

Min

Typ

Max

Notes

Output Voltage Set Point

=5.0V

=3.3V

=2.5V

=1.8V

=1.5V

Vo=1.2V

4.900V
3.234V
2.450V
1.764V
1.470V
1.176V

5.0V
3.3V
2.5V
1.8V
1.5V
1.2V

5.100V
3.366V
2.550V
1.836V
1.530V
1.224V

Test conditions:
Vin=12V, Io=50% full load

Line Regulation

=5.0V

=1.2-3.3V

-
-

±10mV

±5mV

±15mV
±10mV

Load Regulation

=5.0V

=1.2-3.3V

-
-

±10mV

±5mV

±15mV
±10mV

Regulation Over Temperature
(-40

°C to +85°C)

- 30mV

50mV

Output Current

0A - 3A

Current Limit Threshold

3.3A - 9A

Short Circuit Surge Transient

=1.2V-5.0V

0.02A

0.1A

Ripple and Noise (RMS)

=1.2V-5.0V

25mV

50mV

Ripple and Noise (pk-pk)

=1.2V-5.0V

60mV

100mV

Tested with 0-20MHz BW,
with a 220uF tantalum
capacitor at the output.

Turn on Time

15mS

50mS

Overshoot at Turn on

Output Capacitance

220uF

1200uF

Transient Response

Overshoot

150mV

200mV

50% ~ 100%

Max Load

Settling Time

100uS 150uS

Overshoot

150mV

200mV

100% ~ 50%

Max Load

Settling Time

=5.0V

100uS 150uS

Overshoot

130mV

180mV

50% ~ 100%

Max Load

Settling Time

100uS 150uS

Overshoot

130mV

180mV

100% ~ 50%

Max Load

Settling Time

=3.3V

100uS 150uS

Overshoot

100mV

150mV

50% ~ 100%

Max Load

Settling Time

50uS 100uS

Overshoot

100mV

150mV

100% ~ 50%

Max Load

Settling Time

=1.8V -

2.5V

50uS 100uS

Overshoot

90mV

140mV

50% ~ 100%

Max Load

Settling Time

40uS

80uS

Overshoot

90mV

140mV

100% ~ 50%

Max Load

Settling Time

=1.2V -

1.5V

40uS

80uS

Test conditions:
di/dt = 0.5A/uS; Vin = 12V;
with a 220uF Tantalum
capacitor at the output.

Note:

All specifications are typical at nominal input, full load at 25

°C

unless otherwise stated.

Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

· Tel 201-432-0463 · Fax 201-432-9542 · www.belfuse.com

NON-ISOLATED DC/DC CONVERTERS

4.5V-32V Input

1.2V-5.0V/3A Output

General Specifications

Parameter

Min

Typ

Max

Notes

Efficiency

=5.0V

=3.3V

=2.5V

=1.8V

=1.5V

Vo=1.2V

89%
87%
85%
82%
80%
78%

92%
90%
88%
85%
83%
81%

-
-
-
-
-

Measured at Vin=12V, full load and
Ta=25

°C

Switching Frequency

200KHz

300KHz

400KHz

Output Trim Range (narrow trim)

90%Vo

110%Vo

MTBF

8,120,000 hours

Calculated Per Bell Core TR-332 (I

Nominal; T

= 25

°C)

Dimensions (surface mount)

Inches (L × W × H)

Millimeters (L × W × H)

0.78 x 0.70 x 0.32

19.81 x 17.78 x 8.13

Dimensions (vertical)

Inches (L × W × H)

Millimeters (L × W × H)

0.70 x 0.308 x 0.65

17.78 x 7.82 x 16.51

Weight -

5.1g

Control Specifications

Parameter

Min

Typ

Max

Notes

Remote On/Off

Signal Low (Unit On)

-0.3V

Signal High (Unit Off)

2.8V

12V

Remote on/off pin open, unit on.

Output Trim Equations

Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between
the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of
the resistors should be used for any given application.

adj

nom

trimdown

nom

adj

trimup

Vnom

A B C D

5.0 61.850

29.400

11.760

14.700

3.3 53.840

61.700

17.200

40.200

2.5 9.556

15.620

4.496

10.000

1.8 3.849

13.830

3.064

10.000

1.5 3.102

14.420

3.536

10.000

1.2 1.794

10.910

3.536

6.490

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup

Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

· Tel 201-432-0463 · Fax 201-432-9542 · www.belfuse.com

NON-ISOLATED DC/DC CONVERTERS

4.5V-32V Input

1.2V-5.0V/3A Output

Efficiency Data

5.0V Module

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

0.3

0.8

1.5

2.3

3.0

Output Current

f
f
i
ci

8V
12V
24V
32V

3.3V Module

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

0.3

0.8

1.5

2.3

3.0

Output Current

f
f
i
c
i
en

4.9V
12V
24V
32V

2.5V Module

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

0.3

0.8

1.5

2.3

3.0

Output Current

f
f
i
ci

c
y

4.5V
12V
24V
32V

1.8V Module

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

0.3

0.8

1.5

2.3

3.0

Output Current

f
f
i
ci

e
n
cy

4.5V
12V
24V
32V

1.5V Module

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

0.3

0.8

1.5

2.3

3.0

Output Current

f
f
i
c
i
en

4.5V
12V
24V
32V

1.2V Module

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

0.3

0.8

1.5

2.3

3.0

Output Current

f
f
i
ci

4.5V
12V
24V
32V

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: X7AH-03H

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: X7AH-03H