SRAH-12F250 datasheet(2/12 Pages) BEL

Part #	SRAH-12F250

Description	NON-ISOLATED DC/DC CONVERTERS

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Manufacturer	BEL [Bel Fuse Inc.]

Direct Link	http://www.belfuse.com

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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

3.0 Vdc - 5.5 Vdc Input

1.0 Vdc - 3.3 Vdc/12 A Output

Input Specifications (continued)

Parameter

Min

Typ

Max

Notes

Input Reflected Ripple Current (pk-pk)

-

260 mA

320 mA

Input Reflected Ripple Current (rms)

-

75 mA

120 mA

With simulated source impedance of

500 nH, 5 Hz to 20 MHz; use a

270 uF/6.3 V cap with ESR=0.03 ohm

max at 100 kHz

I

2t Inrush Current Transient

-

0.09 A

2s0.2 A2s

Turn on Voltage Threshold

2.1 V

-

Turn off Voltage Threshold

-

2 V

2.4 V

Note:

All specifications are typical at 25 °C unless otherwise stated.

Output Specifications

Parameter

Min

Typ

Max

Notes

Output Voltage Set Point

VO=3.3 V

VO=2.5 V

VO=1.8 V

VO=1.5 V

VO=1.2 V

VO=1.0 V

3.234 V

2.450 V

1.764 V

1.470 V

1.176 V

0.980 V

3.3 V

2.5 V

1.8 V

1.5 V

1.2 V

1.0 V

3.366 V

2.550 V

1.836 V

1.530 V

1.224 V

1.020 V

Test conditions:

Vin=5 V, Io= 50% load

Line Regulation

-

±1 mV

±4 mV

Load Regulation

-

±2 mV

±5 mV

Regulation Over Temperature

(-40

°C to +85 °C)

VO=3.3 V

VO=2.5 V

VO=1.8 V

VO=1.5 V

VO=1.2 V

VO=1.0 V

-

±10 mV

±9 mV

±7 mV

±6 mV

±5 mV

±4mV

±15 mV

±13 mV

±12 mV

±11 mV

±10 mV

±9mV

Output Current

0 A

-

12 A

Current Limit Threshold

20 A

-

30 A

Short Circuit Surge Transient

-

0.3 A

2s

0.6 A

2s

Ripple and Noise (rms)

-

12 mV

21 mV

Ripple and Noise (pk-pk)

-

50 mV

90 mV

Test conditions:

0-20 MHz BW; 1 uF ceramic

capacitor and 330 uF external

capacitor at the output.

Turn on Time

-

5 mS

10 mS

Overshoot at Turn on

-

0%

3%

Output Capacitance

330 uF

-

4800 uF

Transient Response

Overshoot

-

110 mV

150 mV

50% ~ 100%

Max Load

Settling Time

-

40 uS

80 uS

Overshoot

-

110 mV

150 mV

100% ~ 50%

Max Load

Settling Time

VO=3.3 V

-

40 uS

80 uS

Overshoot

-

100 mV

150 mV

50% ~ 100%

Max Load

Settling Time

-

30 uS

60 uS

Overshoot

-

100 mV

150 mV

100% ~ 50%

Max Load

Settling Time

VO=2.5 V

-

30 uS

60 uS

Overshoot

-

90 mV

130 mV

50% ~ 100%

Max Load

Settling Time

-

20 uS

40 uS

Overshoot

-

90 mV

130 mV

100% ~ 50%

Max Load

Settling Time

VO=1.0 V -

1.8 V

-

20 uS

40 uS

Test conditions:

di/dt=0.5A/us, Vin=5V, with

330uF external load

capacitance.

Note:

All specifications are typical at 5 V input, full load at 25 °C unless otherwise stated.

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