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NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 12A S7DB-12C 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-12C
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
* * * * 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 12A 12A 12A 12A Max. Output Power 30W 21.6W 18.0W 14.4W Typical Efficiency 91% 87% 84% 82% Part Number S7DB-12C250 S7DB-12C180 S7DB-12C150 S7DB-12C120
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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-12C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V 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 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 Input Current 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 10 25 80 0.1 2.85 2.3 Module All Symbol Vin Iin 12 9.5 8.2 6.7 100 20 50 160 0.2 mA mA mArms mApk A2s V V Min 3 Typical 3. 3 Max 3.6 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)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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 / 12A
POWER PRODUCTS
BP02S7DB-12C
Output Specifications
Parameter Output Voltage Set Point 1 2.5V 1.8V 1.5V 1.2V Load Regulation 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 2.5V 1.8V 1.5V 1.2V Output Ripple and Noise 2 2.5V 1.8V 1.5V 1.2V 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 All All Cout 0 Ton All All Iout Ioutlim Ioutsurge 0.1 0.2 0.5 0.6 10 0 0.2 0.4 1 1.2 20 3 4800 ms % F 0 15.6 15 10 10 10 30 25 25 25 12 30 A A A 2s 55 50 40 40 100 100 100 100 mVrms 53 42 38 33 mVp-p 19 13 11 9 38 27 23 18 mV All All Module Symbol Vout 2.450 1.764 1.470 1.176 2.500 1.800 1.500 1.200 3.0 2.0 2.550 1.836 1.530 1.224 10 5 mV mV mV Min Typical Max Units V
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. 10.02
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-12C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 12A
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
100 Ts 50 100 Ts 50
150 100 150 100
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
100 Ts 50 100 Ts 50
150 100 150 100
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/S, Vin=3.3Vdc, Ta = 25 C, and with a 470F (ESR=0.90 ohm) tantalum cap at output.
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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 / 12A
POWER PRODUCTS
BP02S7DB-12C
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 Weight All All 10.5 90 90 90 90 105 110 110 110 10 % g All Fsw Module Symbol 88 84 81 79 250 91 87 84 82 300 340 kHz % Min Typical Max Units %
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.
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. 10.02
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-12C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 12A
Efficiency Data
Module 2.5V 97% 96% 95%
92% 96% 94%
Module 1.8V
Efficiency
Efficiency
94% 3.0V 93% 92% 91% 3.3V 3.6V
3.0V 90% 88% 86% 3.3V 3.6V
90% 89% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
84% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
Module 1.5V 94% 92% 90% Efficiency 3.0V 88% 3.3V 3.6V 86% 84% 82% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current
Module 1.2V 92% 90% 88% Efficiency 3.0V 86% 84% 82% 80% 1 2 3 4 5 6 7 8 9 10 11 12 13 Output Current 3.3V 3.6V
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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 / 12A
POWER PRODUCTS
BP02S7DB-12C
Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap 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. 10.02
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-12C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 12A
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
(c)2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02
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 page 8
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 12A
POWER PRODUCTS
BP02S7DB-12C
Transient Response
Transient response: di/dt = 0.5A/S,external load capacitance Co=470F (tantalum capacitor ESR=0.9 ohm)
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 12
Output Current (A)
100LFM 200LFM 300LFM
10 8 6 4 2 0
0 10 20 30 40 50 60 70 85
Natural Convection
Ambient Temperature, Ta (C) Output Current vs. Local Ambient Temperature and Air Velocity
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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-12C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V 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-12C250 Trim Resistor Calculation
Trim resistor value Rtrim_down(Kohm)
Rtrimup = function
300 270 240 210 180 150 120 90 60 30 0 2 2.05 2.1 2.15 2.2 2.25 2.3 2.35 Adjusted output voltage Vo,adj (V) 2.4 2.45 2.5
Rtrim down =
(
7.544 - 13.52) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 2.5 2.53 2.56 2.59 2.62 2.65 2.68 2.71 Adjusted output voltage Vo,adj(V) 2.74 2.77 2.8
Rtrim up =
(
3.544 - 9.09) Kohm Vo, adj - Vo
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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 / 12A Output Voltage Set-Point Adjustment
300 Trim resistor value Rtrim_down(Kohm)
POWER PRODUCTS
BP02S7DB-12C
S7DB-12C180 Trim Resistor Calculation
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 Adjusted output voltage Vo,adj (V) 1.77 1.8
Rtrim down =
(
3.857 - 12.93) Kohm Vo - Vo, adj
300 Trim 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 - 9.09) Kohm Vo, adj - Vo
300 Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150 120 90 60 30 0 1.3 1.32 1.34 1.36 1.38 1.4 1.42 1.44 1.46 Adjusted output voltage Vo,adj (V) 1.48 1.5
S7DB-12C150 Trim Resistor Calculation
Rtrim down =
(
2.708 - 10.99) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(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 Adjusted output voltage Vo,adj(V) 1.74 1.77 1.8
Rtrim up =
(
3.072 - 7.15) Kohm Vo, adj - Vo
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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-12C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 12A
Output Voltage Set-Point Adjustment
Trim resistor value Rtrim_down(Kohm)
S7DB-12C120 Trim Resistor Calculation
300 270 240 210 180 150 120 90 60 30 0 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 Adjusted output voltage Vo,adj (V) 1.18 1.2
Rtrim down =
(
1.553 - 8.26) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 1.2 1.23 1.26 1.29 1.32 1.35 1.38 1.41 Adjusted output voltage Vo,adj(V) 1.44 1.47 1.5
Rtrim up =
(
3.072 - 4.42) Kohm Vo, adj - Vo
(c)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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 / 12A Mechanical
1.22 [30.99] 0.394 [10.01] Suggested PCB Pad Layout
POWER PRODUCTS
BP02S7DB-12C
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)2002 Bel Fuse Inc.
Specifications subject to change without notice. 10.02
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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