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NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A S7DB-12B 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-12B
Description
The Bel S7DB-12B 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. 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 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 12A 12A 12A 12A 12A Max. Output Power 39.6W 30.0W 21.6W 18.0W 14.4W Typical Efficiency 92% 90% 86% 84% 82% Part Number S7DB-12B330 S7DB-12B250 S7DB-12B180 S7DB-12B150 S7DB-12B120
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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-12B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A
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 Input Current 3.3V 2.5V 1.8V 1.5V 1.2V 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 All All All All All All 50 10 40 140 0.1 4.3 3.85 20 80 280 0.2 4.5 4.49 Module All Symbol Vin Iin 11.2 8.7 6.6 5.5 4.5 mA mA mArms mApk A2s V V Min 4.5 Typical 5 Max 5.5 Units V A
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)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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 / 12A
POWER PRODUCTS
BP02S7DB-12B
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 Output Ripple and Noise Output Current Range Output DC Current Limit Shor t Circuit Surge 3.3V 2.5V 1.8V 1.5V 1.2V Turn on Time Overshoot at Turn On Output Capacitance All All All Cout 0 Ton
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
6.0 6.0 6.0 6.0 6.0 2.0
12 12 10 10 10 5 mV mV
All
22 17 12 10 8
45 34 25 20 17 mV 62 51 40 35 32
All All All All Iout Ioutlim Ioutsurge 0 15.6
30 10
60 25 12 30
mVp-p mVrms A A A 2s
0.25 0.3 0.35 0.45 0.5 12 0
0.5 0.6 0.7 0.9 1 20 3% 4800 ms V F
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)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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-12B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A
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 35 90 Ts 35
120 70 120 70
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 35 90 Ts 35
120 70 120 70
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 35 90 Ts 35
120 70 120 70
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 35 90 Ts 35
120 70 120 70
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 35 90 35
120 70 120 70
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)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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 / 12A
POWER PRODUCTS
BP02S7DB-12B
General Specifications
Parameter Efficiency1 3.3V 2.5V 1.8V 1.5V 1.2V Switching Frequency Output Voltage Trim Range2 Remote Sense Compensation Weight All All All All 10.5 Fsw Module Symbol 89 87 83 81 89 260 90 92 90 86 84 82 300 340 110 10 kHz % Min Typical Max Units %
% g
1. Vin=5V, full load and Ta=25 C. 2. See graphs on pages 10-12.
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.
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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-12B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A
Efficiency Data
Module 3.3V 98% 97% 96%
Module 2.5V 97% 96% 95% 94% 93% 92% 91% 90% 89% 88% 87% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
Efficiency
Efficiency
95% 94% 93% 92% 91% 90% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
4.5V 5.0V 5.5V
4.5V 5.0V 5.5V
Module 1.8V 95% 94% 93% 92% 91% 90% 89% 88% 87% 86% 85% 84% 83% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
Efficiency
4.5V 5.0V 5.5V
Module 1.5V 94% 92% Efficiency 90% 88% 86% 84% 82% 1 23 45 6 78 9 10 11 12 13 Output Current
Module 1.2V 93% 91% Efficiency 89% 87% 85% 83% 81% 79% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
4.5V 5.0V 5.5V
4.5V 5.0V 5.5V
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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 / 12A Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
POWER PRODUCTS
BP02S7DB-12B
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
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)2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
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-12B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
Vout=1.8V 50% to 100% load transients at 5V input and Ta=25 C
(c)2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
Vout=1.8V 100% to 50% load transients at 5V 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 page 8
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
POWER PRODUCTS
BP02S7DB-12B
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
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
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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-12B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
Output Voltage Set-Point Adjustment
S7DB-12B330 Trim Resistor Calculation
Trim resistor value Rtrim_down(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 2.97 3 3.04 3.07 3.1 3.13 3.17 3.2 3.23 Adjusted output voltage Vo,adj (V) 3.27 3.3
Rtrim_ down = (
where,
7.964 - 6.82) Kohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.312V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
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 Adjusted output voltage Vo,adj(V) 3.6 3.63
Rtrim_ up = (
where,
2.536 - 3.65) Kohm Vo, adj - Vo
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.312V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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 / 12A Output Voltage Set-Point Adjustment
S7DB-12B250 Trim Resistor Calculation
Trim resistor value Rtrim_down(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 2.25 2.27 2.3
POWER PRODUCTS
BP02S7DB-12B
Rtrim _ down = (
where,
3.691 - 6.8) Kohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.509V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
2.33 2.35 2.38 2.4 2.42 2.45 Adjusted output voltage Vo,adj (V)
2.48
2.5
1.728 Rtrim_ up = ( - 4.64) Kohm Vo, adj - Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.509V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 2.5 2.52 2.55 2.58 2.6 2.63 2.65 2.67 Adjusted output voltage Vo,adj(V) 2.7 2.73 2.75
S7DB-12B180 Trim Resistor Calculation
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 Adjusted output voltage Vo,adj (V) 1.78 1.8
3.869 Rtrim _ down = ( - 13.84) Kohm Vo - Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.808V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value,Rtrim_up(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.8 1.82 1.84 1.85 1.87 1.89 1.91 1.93 1.94 Adjusted output voltage Vo,adj(V) 1.96 1.98
Rtrim _ up = (
where,
3.072 -10) Kohm Vo, adj - Vo
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.808V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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-12B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 12A
Output Voltage Set-Point Adjustment
S7DB-12B150 Trim Resistor Calculation
Trim resistor value Rtrim_down(Kohm)
270 240 210 180 150.01 120.01 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 Adjusted output voltage Vo,adj (V) 1.49 1.5
Rtrim _ down = (
where,
2.716 - 11.71) Kohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.507V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value,Rtrim_up(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.5 1.51 1.53 1.54 1.56 1.58 1.59 1.61 Adjusted output voltage Vo,adj(V) 1.62 1.64 1.65
Rtrim _ up = (
where,
3.072 - 7.87) Kohm Vo, adj - Vo
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.507V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
S7DB-12B120 Trim Resistor Calculation
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 Adjusted output voltage Vo,adj (V) 1.19 1.2
1.562 Rtrim _ down = ( - 8.48) Kohm Vo - Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.207V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
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 Adjusted output voltage Vo,adj(V) 1.3 1.31 1.32
3.072 - 4.64) Kohm Rtrim _ up = ( Vo, adj - Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.207V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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 / 12A Mechanical
1.22 [30.99] 0.394 [10.01] Suggested PCB Pad Layout
POWER PRODUCTS
BP02S7DB-12B
0.197 [5.00] 0.67 [17.00] 0.895 [22.73] 0.120 [3.05]
0.100 [2.54]
0- 5
0.004 [0.10]
5X 0.197 [5.00] 6X 0.102 [2.59] 0.985 [25.02]
0.345 [8.76] 0.010 [0.25]
2X 0.050 [1.27] 2X 0.079 [1.99] 0.827 [21.01]
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
Dimensions are in inches [millimeters]. Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
12 11 10
9
8
7
1
2
3
4
5
6
(c)2004 Bel Fuse Inc.
Specifications subject to change without notice. 03.04
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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