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 –15V Input / Programmable Output / 25A

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Compact surface mount package

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Ultra Wide input range (3 – 15V)

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6 bit digital voltage programming (0.7 to 5.4V)

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25A of output current

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Remote sense

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Remote On/Off

•

Power Good

Description

The S7KS Keystone Series from Bel is a non-isolated step down DC/DC converters providing up to 25A of

output current in a compact surface mount package with the capability of paralleling and autophasing to provide

up to 200A of output current. This product is designed to operate from any source voltage from 3 to 15V and

provide any output voltage from 0.7V to 5.4V with 6-bit digital programming and 50mV resolution. This DC/DC

converter requires no external components to operate and provides the ultimate in flexibility. It also greatly

simplifies inventory management since a single part can be configured to service a very broad range of

applications.

Part Selection

Output

Voltage

Input

Voltage

Max. Output

Current

On/Off Logic

Part Number

0.7 – 5.4V

3 - 15V

25A

Active High

S7KS-25D1P0

0.7 – 5.4V

3 - 15V

25A

Active Low

S7KS-25D1PL

Input Specifications

Parameter

Min

Typ

Max

Notes

Input Voltage Range

3.0 VDC

15 VDC

Input Current (full load)

18A

Bias Voltage

4.8 VDC

5.2 VDC

Input Current (bias supply)

100mA

200mA

Reflected Ripple Current

150mA rms

With 100uF, 30mOhm

capacitor and 500nH of input

inductance.

Output Specifications

Parameter

Min

Typ

Max

Notes

Voltage Programmability

0.7V

5.4V

Output Current

0A

25A

Set Point Accuracy

2%

Regulation

Line Regulation

Load Regulation

Temperature

10mV

35mV

40mV

Ripple and Noise

pk-pk

rms

50mV

20mV

0 to 20MHz Bandwidth

Full load with external 680uF

oscon capacitor on output.

Turn on Time

8mS

10mS

From Enable

Transient Response

Deviation

Settling Time

150mV

280uS

di/dt = 5A/uS

Load step =50% of max load.

with external 680uF oscon

S7KS- 25D (Keystone) PRELIMINARY

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Analog Trim

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Single wire current sharing

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Autophasing