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NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A S7DB-08B Series
* * * * * * * * * * 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
* * * * 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
(c)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 Current1 Input Reflected Ripple Current (P-P)1 I2t Inrush Current Transient Turn On Voltage Threshold Turn Off Voltage Threshold
mA mA mArms mApk A2s V V
Note: Input capacitance two 270F/10V, ESR = 0.018 max at 100kHz @ 25 C. 1. With simulated source impedance of 500nH, 5Hz to 20MHz.
(c)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 Al l Al l 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 A2s
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 % F
Turn on Time Overshoot at Turn On Output Capacitance
All Al l Al l
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, 1F ceramic cap and 10F aluminum cap on output.
(c)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 s mV s
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 s mV s
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 s mV s
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 s mV s
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 s mV s
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 3. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
(c)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 Efficiency1 3.3V 2.5V 1.8V 1.5V 1.2V Switching Frequency All All Output Voltage Trim Range2 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 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.
(c)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
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
Efficiency Data
Module 3.3V 97.0% 96.0% 95.0% 94.0% 93.0% 92.0% 91.0% 90.0% 1 2 3 4 5 6 7 8 4.5V 5.0V 5.5V
Module 2.5V 95.0% 94.0% 93.0% 92.0% 91.0% 90.0% 89.0% 88.0% 87.0% 1 2 3 4 5 6 7 8 4.5V 5.0V 5.5V
Module 1.8V 94.0% 92.0% 90.0% 88.0% 86.0% 84.0% 82.0% 80.0% 1 2 3 4 5 6 7 8
4.5V 5.0V 5.5V
(c)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 6
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
POWER PRODUCTS
BP02S7DB-08B
Efficiency Data
Module 1.5V 92.0% 91.0% 90.0% 89.0% 88.0% 87.0% 86.0% 85.0% 84.0% 1 2 3 4 5 6 7 8
4.5V 5.0V 5.5V
Module 1.2V 90.0% 88.0% 86.0% 84.0% 82.0% 1 2 3 4 5 6 7 8 4.5V 5.0V 5.5V
(c)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 7
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
Ripple and Noise
Ripple and noise at full load and 5Vdc input, 3.3Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 2.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.8Vdc output and Ta=25 C
(c)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 8
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
POWER PRODUCTS
BP02S7DB-08B
Ripple and Noise
Ripple and noise at full load and 5Vdc input, 1.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.2Vdc output and Ta=25 C
(c)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 9
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
Transient Response
Transient response: di/dt = 0.5A/S
Vout=3. 3V 50% to 100% load transients at 5V input and Ta=25 C
Vout=3.3V 100% to 50% load transients at 5V input and Ta=25 C
Vout=2.5V 50% to 100% load transients at 5V input and Ta=25 C
Vout=2.5V 100% to 50% load transients at 5V input and Ta=25 C
(c)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 10
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
POWER PRODUCTS
BP02S7DB-08B
Transient Response
Transient response: di/dt = 0.5A/S
Vout=1.8V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.8V 100% to 50% load transients at 5V input and Ta=25 C
Vout=1.5V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.5V 100% to 50% load transients at 5V input and Ta=25 C
(c)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 11
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
Transient Response
Transient response: di/dt = 0.5A/S
Vout=1.2V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.2V 100% to 50% load transients at 5V input and Ta=25 C
Thermal Considerations
100LFM 200LFM Derating Curve 8 300LFM
Output Current (A)
6
4
Natural Convection
2
0
0 30 60 65 70 75 80 85
Ambient Temperature, Ta (C) Output Current vs. Local Ambient Temperature and Air Velocity
(c)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 12
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
POWER PRODUCTS
BP02S7DB-08B
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
S7DB-08B330 Trim Resistor Calculation
Trim resistor value Rtrim down (Kohm)
270 240 210 180
Rtrim down =
(
7.964 - 6.82) Kohm Vo - Vo, adj
150.01 120.01 90.01 60.01 30.01 0.01 2.31 2.41 2.51 2.61 2.71 2.8 2.9 3 3.1 3.2 3.3
Adjusted Output Voltage Vo,adj (V)
Trim resistor value Rtrim up (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 3.3 3.33 3.37 3.4 3.43 3.46 3.5 3.53 3.56 3.6 3.63
Rtrim up =
(
2.536 - 3.65) Kohm Vo, adj - Vo
Adjusted Output Voltage Vo,adj (V)
(c)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 13
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
Output Voltage Set-Point Adjustment
Trim resistor value Rtrim down (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.75 1.83
1.9 1.98 2.05 2.13 2.2 2.27 2.35 2.42 2.5
S7DB-08B250 Trim Resistor Calculation
Rtrim down =
(
3.691 - 4.12) Kohm Vo - Vo, adj
Adjusted Output Voltage Vo,adj (V)
270
Trim resistor value Rtrim up (Kohm)
240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 2.5 2.52 2.55 2.58 2.6 2.63 2.65 2.67 2.7 2.73 2.75
Rtrim up =
(
1.728 - 1.96) Kohm Vo, adj - Vo
Adjusted Output Voltage Vo,adj (V)
Trim resistor value Rtrim down (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.62 1.64 1.66 1.67 1.69 1.71 1.73 1.75 1.76 1.78 1.8
S7DB-08B180 Trim Resistor Calculation
Rtrim down =
(
1.52 - 4.12) Kohm Vo - Vo, adj
Adjusted Output Voltage Vo,adj (V)
Trim resistor value Rtrim up (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.8 1.84 1.87 1.91 1.94 1.98 2.02 2.05 2.09 2.12 2.16
Rtrim up =
(
1.208 - 2.61) Kohm Vo, adj - Vo
Adjusted Output Voltage Vo,adj (V)
(c)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 14
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A Output Voltage Set-Point Adjustment
270
Trim resistor value Rtrim down (Kohm)
POWER PRODUCTS
BP02S7DB-08B
240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.35 1.37 1.38 1.4 1.41 1.43 1.44 1.46 1.47 1.49 1.5
S7DB-08B150 Trim Resistor Calculation
Rtrim down =
(
0.749 - 3.21) Kohm Vo - Vo, adj
Adjusted Output Voltage Vo,adj (V)
Trim resistor value Rtrim up (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 Adjusted Output Voltage Vo,adj (V) 1.74 1.77 1.8
Rtrim up =
(
0.848 - 2.15) Kohm Vo, adj - Vo
Trim resistor value Rtrim down (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.08 1.09 1.1 1.12 1.13 1.14 1.15 1.16 1.18 1.19 1.2 Adjusted Output Voltage Vo,adj (V)
S7DB-08B120 Trim Resistor Calculation
Rtrim down =
(
1.562 - 8.48) Kohm Vo - Vo, adj
Trim resistor value Rtrim up (Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.2 1.21 1.22 1.24 1.25 1.26 1.27 1.28 1.3 1.31 1.32 Adjusted Output Voltage Vo,adj (V)
Rtrim up =
(
3.064 - 4.64) Kohm Vo, adj - Vo
(c)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 15
POWER PRODUCTS
BP02S7DB-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 8A
Mechanical
0.827 [21.00] 0.102 [2.60] 0.669 [17.00]
0.118 [3.00] 0.197 [5.00]
0.079 [2.00]
0.345 [8.75]
Pin 1 2 3 4 5 6 7 8 9 10 11 12 Function Ground Ground Ground Ground +Vin +Vin Trim Remote On/Off Remote Sense +Vo +Vo +Vo
1.22 [31.00]
12 11 10 9 8 7
123456
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 06.02
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
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