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NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 8A S7DB-08C 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-08C
Description
The Bel S7DB-08C 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. 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 3.3V 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 2.5V 1.8V 1.5V 1.2V Input Voltage 3.3V 3.3V 3.3V 3.3V Max. Output Current 8A 8A 8A 8A Max. Output Power 20W 14.4W 12W 9.6W Typical Efficiency 92% 88% 86% 83% Part Number S7DB-08C250 S7DB-08C180 S7DB-08C150 S7DB-08C120
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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-08C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V 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 4 4 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 2.5V 1.8V 1.5V 1.2V All 10 20 60 0.05 2.85 2.3 7.9 6.3 5.3 4.4 100 20 40 100 0.1 mA mA mArms mApk A2s V V Min 3 Typical 3.3 Max 3.6 Units V A
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
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. 08.02
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
3.3V Input / 1.2V - 2.5V Output / 8A
POWER PRODUCTS
BP02S7DB-08C
Output Specifications
Parameter Output Voltage Set Point 1 2.5V 1.8V 1.5V 1.2V Load Regulation 2.5V 1.8V 1.5V 1.2V Line Regulation Regulation Over Temperature 2.5V 1.8V 1.5V 1.2V Total Output Voltage Regulation 2.5V 1.8V 1.5V 1.2V Output Ripple and Noise
2
Module
Symbol Vout
Min
Typical
Max
Units V
2.45 1.764 1.47 1.176
2.5 1.8 1.5 1.2
2.55 1.836 1.53 1.224 mV
7.0 7.0 6.0 6.0 2.0
15 15 15 15 5 mV mV
All
10 8 5 4
25 20 15 12 mV 45 40 35 32 mVp-p
2.5V 1.8V 1.5V 1.2V Output Ripple and Noise 2 Output Current Range Output DC Current Limit Shor t Circuit Surge 2.5V 1.8V 1.5V 1.2V Turn on Time Overshoot at Turn On Output Capacitance All Al l Al l Cout 0 Ton All Al l Al l Iout Ioutlim Ioutsurge 0 10.4
55 40 40 40 10
100 75 75 75 25 8 20 mVrms A A A2s
0.06 0.07 0.09 0.15 10 0
0.12 0.14 0.18 0.22 20 3 3200 ms % F
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.
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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-08C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 8A
Output Specifications
Parameter Transient Response
3
Module
Symbol
Min
Typical
Max
Units
V 50% to 100% of Max Load Settling Time 2.5V V 100% to 50% of Max Load Settling Time Transient Response
3
110 Ts 50 110 Ts 50
150 100 150 100
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
90 Ts 50 90 Ts 50
125 100 125 100
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
90 Ts 50 90 Ts 50
125 100 125 100
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
90 50 90 50
125 100 125 100
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 with a 470F Tantalum cap at output.
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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
3.3V Input / 1.2V - 2.5V Output / 8A
POWER PRODUCTS
BP02S7DB-08C
General Specifications
Parameter Efficiency1 2.5V 1.8V 1.5V 1.2V Switching Frequency Output Voltage Trim Range2 2.5V 1.8V 1.5V 1.2V Remote Sense Compensation 2.5V 1.8V 1.5V 1.2V Weight All 10.5 5 10 10 10 g 80 90 90 90 105 110 110 110 % All Fsw Module Symbol 89 85 83 80 250 92 88 86 83 300 340 kHz % Min Typical Max Units %
1. Vin=3.3V, full load and Ta=25 C. 2. See graphs on pages 12-14.
Control Specifications
Parameter Remote On/Off 3 Signal Low (Unit Off) Signal High (Unit On) Module All All All Symbol Vouten -0.3 2.8 0.8 4 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. 08.02
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-08C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 8A
Efficiency Data
Module 2.5V 96% 95% 94%
Module 1.8V 93% 92% 91% 90% 89% 88% 87% 86% 85% 84% 83% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Output Current
Efficiency
Efficiency
93% 92% 91% 90% 89% 88% 87% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Output Current
3.0V 3.3V 3.6V
3.0V 3.3V 3.6V
Module 1.5V 92% 91% 90% 89% 88% 87% 86% 85% 84% 83% 82% 81% 80% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 O utput Current
Module 1.2V 90% 89% 88% 87% 86% 85% 84% 83% 82% 81% 80% 79% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Output Current
Efficiency
Efficiency
3.0V 3.3V 3.6V
3.0V 3.3V 3.6V
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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
3.3V Input / 1.2V - 2.5V Output / 8A
POWER PRODUCTS
BP02S7DB-08C
Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap are added at the output.
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
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
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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-08C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 8A
Transient Response
Transient response: di/dt = 0.5A/S, external load capacitance Co=470F (Tantalum capacitor)
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
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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
3.3V Input / 1.2V - 2.5V Output / 8A
POWER PRODUCTS
BP02S7DB-08C
Transient Response
Transient response: di/dt = 0.5A/S, external load capacitance Co=470F (Tantalum capacitor)
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
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
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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-08C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 8A
Thermal Considerations
Derating Curve 8
100LFM 200LFM 300LFM
Output Current (A)
6 4 Natural Convection 2
0
0 10 20 30 40 50 60 70 85
Ambient Temperature, Ta (C) Output Current vs. Local Ambient Temperature and Air Velocity
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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
3.3V Input / 1.2V - 2.5V Output / 8A Output Voltage Set-Point Adjustment
300 T rim resistor value Rtrim_dow n(Kohm) 270 240 210 180 150 120 90 60 30 0 1.9 1.96 2.02
POWER PRODUCTS
BP02S7DB-08C
S7DB-08C250 Trim Resistor Calculation
Rtrim down =
(
9.590 - 14.29) Kohm Vo - Vo, adj
2.08 2.14 2.2 2.26 2.32 2.38 A djusted outp ut voltage Vo,adj (V)
2.44
2.5
300
Rtrim up =
(
4.504 - 8.66) Kohm Vo, adj - Vo
T rim resistor value,Rtrim_up(Kohm)
270 240 210 180 150 120 90 60 30 0 2.5 2.52 2.53 2.54 2.56 2.58 2.59 2.61 Adjusted output voltage Vo,adj(V) 2.62 2.63 2.65
300 T rim resistor value Rtrim_dow n(Kohm) 270 240 210 180 150 120 90 60 30 0 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 1.74 A djust ed outp ut voltage Vo,adj (V) 1.77 1.8
S7DB-08C180 Trim Resistor Calculation
Rtrim down =
(
3.869 - 12.5) Kohm Vo - Vo, adj
300 T rim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 1.8 1.83 1.86 1.89 1.92 1.95 1.98 2.01 Adjusted output voltage Vo,adj(V) 2.04 2.07 2.1
Rtrim up =
(
3.072 - 8.66) Kohm Vo, adj - Vo
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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-08C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 8A
Output Voltage Set-Point Adjustment
300 T rim resistor value Rtrim_down(Kohm) 270 240 210 180 150 120 90 60 30 0 1.25 1.27 1.3 1.33 1.35 1.38 1.4 1.43 1.45 Adjust ed outp ut voltage Vo,adj (V) 1.48 1.5
S7DB-08C150 Trim Resistor Calculation
Rtrim down =
(
2.712 - 12.5) Kohm Vo - Vo, adj
300 T rim resistor value,Rtrim_up (Kohm) 270 240 210 180 150 120 90 60 30 0 1.5
300 270 T rim resistor value Rtrim_down(Kohm) 240 210 180 150 120 90 60 30 0 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 Adjusted output voltage Vo,adj (V) 1.16 1.18 1.2
Rtrim up =
(
3.072 - 8.66) Kohm Vo, adj - Vo
1.54
1.58
1.62 1.66 1.7 1.74 1.78 Adjusted output voltage Vo,adj(V)
1.82
1.86
1.9
S7DB-08C120 Trim Resistor Calculation
Rtrim down =
(
1.562 - 8.48) Kohm Vo - Vo, adj
300 270 T rim resistor value,Rtrim_up (Kohm) 240 210 180 150 120 90 60 30 0 1.2 1.22 1.24 1.26 1.28 1.3 1.32 1.34 Adjusted output voltage Vo,adj(V) 1.36 1.38 1.4
Rtrim up =
(
3.072 - 4.64) Kohm Vo, adj - Vo
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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
3.3V Input / 1.2V - 2.5V Output / 8A
POWER PRODUCTS
BP02S7DB-08C
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
Dimensions are in inches [millimeters]. Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 08.02
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
page 13

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