Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
Nonisolated
Compact, low profile surface mount package
Fixed frequency
High efficiency means less power dissipation
Excellent thermal performance
Optimized for cost
Remote on/off
Undervoltage lockout (UVLO)
Over current and short circuit protection
Remote sense
Description
The Bel S7DB-12C modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal
3.3V source. These converters are available in a range of output voltages from 1.2V to 2.5V. They are packaged in a compact,
low profile, surface mount DIP package for ease of layout and space savings. 12A maximum output is also provided. Standard
features include remote on/off, remote sense, over current and short circuit protection, UVLO and output voltage adjust.
These products may be used almost anywhere low voltage silicon is employed and a 3.3V source is available. Typical
applications include file servers, routers, line cards and other computing and communications equipment.
Applications
page 1
S7DB-12C Series
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
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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
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 2
Input Specifications
Absolute Maximum Ratings
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC
converter or may permanently damage the device.
Note: Input capacitance two 270F/10V, ESR = 0.018
max at 100kHz @ 25 C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
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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
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 3.3V, Iout = full load, Ta = 25 C.
2. 0 - 20MHz, 1F ceramic cap and 10F aluminum cap on output.
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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
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 4
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt = 0.5A/S, Vin=3.3Vdc, Ta = 25 C, and with a 470F (ESR=0.90 ohm) tantalum cap at output.
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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
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 5
Note: On/off pin designed to work with an open collector/drain switch.
Control Specifications
General Specifications
1. Vin=3.3V, full load and Ta=25 C.
2. See graphs on pages 10-12. Total adjustment of trim, setpoint and remote sense combined should
not exceed 5% at nominal Vin, 25C ambient for the 2.5V output module.
3. With remote on/off pin 8 open, the module is on.
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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
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 6
Efficiency Data
Module 2.5V
89%
90%
91%
92%
93%
94%
95%
96%
97%
1
2
3
4
5
6
7
8
9
10
11
12
13
Output Current
E
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3.0V
3.3V
3.6V
Module 1.8V
84%
86%
88%
90%
92%
94%
96%
1
2
3
4
5
6
7
8
9
10
11
12
13
Output Current
E
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3.0V
3.3V
3.6V
Module 1.5V
82%
84%
86%
88%
90%
92%
94%
1
2
3
4
5
6
7
8
9
10
11
12
13
Output Current
E
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3.0V
3.3V
3.6V
Module 1.2V
80%
82%
84%
86%
88%
90%
92%
1
2
3
4
5
6
7
8
9
10
11
12
13
Output Current
E
f
f
i
c
i
enc
y
3.0V
3.3V
3.6V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 7
Ripple and Noise
Ripple and noise at full load and 3.3Vdc input,
2.5Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc input,
1.8Vdc output and Ta=25 C
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
Ripple and noise at full load and 3.3Vdc input,
1.5Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc input,
1.2Vdc output and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 8
Transient Response
Transient response: di/dt = 0.5A/S,external load capacitance Co=470F (tantalum capacitor ESR=0.9 ohm)
Vout=2.5V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 3.3V input and Ta=25 C
Vout=1.8V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.8V
100% to 50% load transients at 3.3V input and Ta=25 C
Vout=1.5V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 3.3V input and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 9
Transient Response
Vout=1.2V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 3.3V input and Ta=25 C
Thermal Considerations
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
30
70
6
10
4
2
0
Natural Convection
100LFM
10
20
40
50
12
8
200LFM
300LFM
85
Transient response: di/dt = 0.5A/S,external load capacitance Co=470F (tantalum capacitor ESR=0.9 ohm)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 10
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Output Voltage Set-Point Adjustment
S7DB-12C250 Trim Resistor Calculation
Rtrim down =
7.544
Vo Vo, adj
13.52
)
Kohm
(
Rtrim up =
3.544
Vo, adj Vo
9.09
)
Kohm
(
Rtrimup
function
=
2
2.05
2.1
2.15
2.2
2.25
2.3
2.35
2.4
2.45
2.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted outp ut voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
R
t
r
i
m
_dow
n(
K
ohm
)
2.5
2.53
2.56
2.59
2.62
2.65
2.68
2.71
2.74
2.77
2.8
0
30
60
90
120
150
180
210
240
270
300
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
o
r
va
l
u
e
,
R
t
r
i
m
_
up
(
K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 11
S7DB-12C180 Trim Resistor Calculation
Rtrim down =
3.857
Vo Vo, adj
12.93
)
Kohm
(
Rtrim up =
3.072
Vo, adj Vo
9.09
)
Kohm
(
Output Voltage Set-Point Adjustment
S7DB-12C150 Trim Resistor Calculation
Rtrim down =
2.708
Vo Vo, adj
10.99
)
Kohm
(
Rtrim up =
3.072
Vo, adj Vo
7.15
)
Kohm
(
1.5
1.53
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.8
0
30
60
90
120
150
180
210
240
270
300
Adjusted outp ut voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
R
t
r
i
m
_
dow
n(
K
o
hm
)
1.8
1.83
1.86
1.89
1.92
1.95
1.98
2.01
2.04
2.07
2.1
0
30
60
90
120
150
180
210
240
270
300
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
,
R
t
r
i
m
_up
(
K
ohm
)
1.3
1.32
1.34
1.36
1.38
1.4
1.42
1.44
1.46
1.48
1.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
R
t
r
i
m
_dow
n(
K
ohm
)
1.5
1.53
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.8
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
,
R
t
r
i
m
_
up
(
K
ohm
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 12
S7DB-12C120 Trim Resistor Calculation
Rtrim down =
1.553
Vo Vo, adj
8.26
)
Kohm
(
Rtrim up =
3.072
Vo, adj Vo
4.42
)
Kohm
(
Output Voltage Set-Point Adjustment
1
1.02
1.04
1.06
1.08
1.1
1.12
1.14
1.16
1.18
1.2
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
Rt
r
i
m
_
dow
n
(
K
ohm
)
1.2
1.23
1.26
1.29
1.32
1.35
1.38
1.41
1.44
1.47
1.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
res
i
s
t
o
r
v
a
l
u
e
,
R
t
ri
m
_
up
(K
oh
m
)
CORPORATE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel
201-432-0463
Fax
201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel
852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel
44-1772-556601
Fax 44-1772-888366
www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12C
3.3V Input / 1.2V 2.5V Output / 12A
page 13
Mechanical
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
1.22 [30.99]
0.394 [10.01]
0.67
[17.00]
0.985 [25.02]
5X
0.197
[5.00]
6X
0.102
[2.59]
0.345
[8.76]
0.010
[0.25]
0.827
[21.01]
2X 0.050 [1.27]
2X 0.079 [1.99]
0.004 [0.10]
0- 5
0.100
[2.54]
0.120 [3.05]
0.197 [5.00]
0.895
[22.73]
Suggested PCB Pad Layout
1
2
3
4
5
6
12 11 10
9
8
7
n
i
P
n
o
i
t
c
n
u
F
1
d
n
u
o
r
G
2
d
n
u
o
r
G
3
d
n
u
o
r
G
4
d
n
u
o
r
G
5
n
i
V
+
6
n
i
V
+
7
m
i
r
T
8
f
f
O
/
n
O
e
t
o
m
e
R
9
)
+
(
e
s
n
e
S
e
t
o
m
e
R
0
1
o
V
+
1
1
o
V
+
2
1
o
V
+
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