NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V – 3.3V Output / 8A
S7DB-08B Series
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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
POWER PRODUCTS
BP02S7DB-08B
Description
The Bel S7DB-08B modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 5V
source. These converters are available in a range of output voltages from 1.2V to 3.3V. They are packaged in a compact, low
profile, surface mount DIP package for ease of layout and space savings. 8A maximum output is also provided. Standard
features include remote on/off, 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 5V source is available. Typical applications include file
servers, routers, line cards and other computing and communications equipment.
Applications
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Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
Output
Voltage
3.3V
2.5V
1.8V
1.5V
1.2V
Input
Voltage
5V
5V
5V
5V
5V
Max. Output
Current
8A
8A
8A
8A
8A
Max. Output
Power
26.4W
20W
14.4W
12W
9.6W
Typical
Efficiency
93%
91%
87%
86%
83%
Part Number
S7DB-08B330
S7DB-08B250
S7DB-08B180
S7DB-08B150
S7DB-08B120
©2002 Bel Fuse Inc.
Specifications subject to change without notice. 06.02
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 1
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V – 3.3V Output / 8A
Absolute Maximum Ratings
Parameter
Continuous Input Voltage
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Symbol
Vin
Vouten
Tamb
Tstor
Min
-0.3
-0.3
-40
-55
Typical
Max
6
6
85
100
Unit
V
V
°C
°C
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC
converter or may permanently damage the device.
Input Specifications
Parameter
Operating Input Voltage
Module
All
Symbol
Vin
Iin
Input Current
3.3V
2.5V
1.8V
1.5V
1.2V
All
50
4
30
60
0.05
4.3
3.85
8
50
100
0.07
4.5
4.49
7.2
5.6
4.6
3 .9
3.0
A
Min
4.5
Typical
5
Max
5.5
Units
V
No Load Input Current
Remote Off Input Current
Input Reflected Ripple Current
1
Input Reflected Ripple Current (P-P)
1
I
2
t Inrush Current Transient
Turn On Voltage Threshold
Turn Off Voltage Threshold
mA
mA
mA
rms
mApk
A
2
s
V
V
Note: Input capacitance two 270µF/10V, ESR = 0.018
Ω
max at 100kHz @ 25° C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
©2002 Bel Fuse Inc.
Specifications subject to change without notice. 06.02
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 2
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V – 3.3V Output / 8A
POWER PRODUCTS
BP02S7DB-08B
Output Specifications
Parameter
Output Voltage Set Point
1
3.3V
2.5V
1.8V
1.5V
1.2V
Load Regulation
3.3V
2.5V
1.8V
1.5V
1.2V
Line Regulation
Regulation Over Temperature
3.3V
2.5V
1.8V
1.5V
1.2V
Total Output Voltage Regulation
3.3V
2.5V
1.8V
1.5V
1.2V
Output Ripple and Noise
2
Module
Symbol
Vout
Min
Typical
Max
Units
V
3.234
2.45
1.764
1.47
1.176
3.3
2.5
1.8
1.5
1.2
3.366
2.55
1.836
1.53
1.224
mV
4.0
4.0
3.0
3.0
3.0
2 .0
10
10
8
8
8
5
mV
mV
All
20
15
12
10
10
40
30
25
20
20
mV
55
45
38
33
33
All
All
All
All
Iout
Ioutlim
Ioutsurge
3.3V
2.5V
1.8V
1.5V
1.2V
0
10.4
30
10
50
20
8
20
mVp-p
mVrms
A
A
A
2
s
Output Ripple and Noise
2
Output Current Range
Output DC Current Limit
Shor t Circuit Surge
0.1
0.3
0.4
0.5
0.6
Ton
12
0
Cout
0
0.3
0.6
0.8
1.0
1.2
20
3
3200
ms
%
µF
Turn on Time
Overshoot at Turn On
Output Capacitance
All
All
All
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
1. Vin = 5V, Iout = full load, Ta = 25° C.
2. 0 - 20MHz, 1µF ceramic cap and 10µF aluminum cap on output.
©2002 Bel Fuse Inc.
Specifications subject to change without notice. 06.02
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 3
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V – 3.3V Output / 8A
Output Specifications
Parameter
Transient Response
3
Module
Symbol
Min
Typical
Max
Units
∆
V 50% to 100% of Max Load
Settling Time
3.3V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
90
Ts
25
90
Ts
25
120
50
120
50
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
2.5V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
90
Ts
25
90
Ts
25
120
50
120
50
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
1.8V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
70
Ts
25
70
Ts
25
100
50
100
50
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
1.5V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
70
Ts
25
70
Ts
25
100
50
100
50
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
1.2V
∆
V 100% to 50% of Max Load
Settling Time
Ts
Ts
70
25
70
25
100
50
100
50
mV
µs
mV
µs
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
3. di/dt = 0.5A/1µS, Ta = 25° C without external load capacitance.
©2002 Bel Fuse Inc.
Specifications subject to change without notice. 06.02
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 4
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V – 3.3V Output / 8A
POWER PRODUCTS
BP02S7DB-08B
General Specifications
Parameter
Efficiency
1
3.3V
2.5V
1.8V
1.5V
1.2V
Switching Frequency
All
All
Output Voltage Trim Range
2
3.3V
2.5V
1.8V
1.5V
1.2V
All
All
10.5
70
70
90
90
90
110
110
120
120
110
10
%
g
Fsw
Module
Symbol
η
90
88
84
83
80
260
93
91
87
86
83
300
340
kHz
%
Min
Typical
Max
Units
%
Remote Sense Compensation
Weight
1. Vin=5.0V, full load and Ta=25° C.
2. See graphs on pages 12-14.
Control Specifications
Parameter
Remote On/Off
3
Signal Low (Unit On)
Signal High (Unit Off)
Module
All
All
All
Symbol
Vouten
0
2.5
1
5.5
Min
Typical
Max
Units
V
V
V
3. With remote on/off pin 8 open, the module is on.
Note: On/off pin designed to work with an open collector/drain switch.
©2002 Bel Fuse Inc.
Specifications subject to change without notice. 06.02
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 5
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