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NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
S7BC-10F2Ax Series
* * * * * * * Non-Isolated High Efficiency High Power Density Fixed Frequency(300KHz) OCP/SCP Flexible Output Voltage Sequencing Remote Sense * * * * * * * Under-Voltage Lockout (UVLO) Over Temperature Protection Wide Input Range Wide Trim Range Remote On/Off Converter Can Sink and Source Current Active Low/High (option)
Description
The Bel S7BC-10F2Ax modules are a series of non-isolated dc-dc converters that deliver up to 10A of output current with full load efficiency of 95% at 3.3V output. These modules provide precisely regulated voltage programmable via external resistor from 0.75V to 3.63V over a wide range of input voltage (2.4V-5.5V). These modules have a sequencing feature that enables designers to implement various types of output voltage sequencing when powering multiple voltages on a board. The open-frame construction and small footprint enable designers to develop cost and space-efficient solutions. Standard features include remote On/Off, remote sense, over current protection, short current protection, wide input, and programmable output voltage.
Part Selection
Output Voltage 0.75V - 3.63V Input Voltage 2.4V - 5.5V Max. Output Current 10A Max. Output Power 36.3W Typical Efficiency 95% Model Number Active Low S7BC-10F2AL Model Number Active High S7BC-10F2A0
Note: Add "G" suffix at the end of the model number to indicate "Tray Packaging".
Absolute Maximum Ratings
Parameter Input Voltage (continuous) Output Enable Terminal Voltage Sequencing Voltage
1
Min -0.3V -0.3V -0.3V -40C -55C
Typ -
Max 5.8V 5.8V Vin 85C 125C
Notes
Ambient Temperature Storage Temperature
Notes: All specifications are typical at 25C unless otherwise stated. 1. S7BC-10F2Ax series of modules include a sequencing feature that enables users to implement various types of output voltage sequencing in their applications. This is accomplished via an additional sequencing pin. When the sequencing feature is not used, tie the SEQ pin to Vin.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Input Specifications
Parameter Input Voltage Vo=3.3V Vo=1.8V~2.5V Vo 1.5V Input Current (full load) Vo=3.3V Vo=2.5V Vo=1.8V Vo=1.5V Vo=1.2V Vo=0.75V Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (RMS) I t Inrush Current Transient Turn-on Voltage Threshold Turn-off Voltage Threshold
2
Min 4.5V 3.0V 2.4V -
Typ 7.0A 5.5A 4.0A 3.5A 3.0A 2.0A 80mA 15mA 140mA 40mA 2.2V 2.0V
Max 5.5V 5.5V 5.5V 8.0A 9.5A 9.0A 7.5A 6.0A 4.0A 0.2A s 2
Notes
Tested with two 100uF/10V tantalum input capacitors & simulated source impedance of 1uH, 5Hz to 20MHz.
Note: All specifications are typical at 25C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point Output Voltage Set Point Load Regulation Line Regulation Regulation Over Temperature (-40C to +85C) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (pk-pk) Ripple and Noise (RMS) Turn on Time Overshoot at Turn on Output Capacitance ESR 1mohm ESR 10mohm Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time VO=3.3V 130mV 50uS 150mV 50uS di/dt=2.5A/uS; Vin=5V; and with two 150uF/16V tantalum capacitors & 1uF/10V ceramic capacitor at the output Min -2%Vo,set -3%Vo,set 0A 15A 0uF 0uF Typ 0.4%Vo,set 0.3%Vo,set 0.5%Vo,set 25mV 8mV 4mS 0%Vo,set Max 2%Vo,set 3%Vo,set 10A 27A 2 1.5A s 50mV 15mV 8mS 3%Vo,set 1000uF 4700uF Tested with 0-20MHz, 10uF/16V tantalum capacitor & 1uF/10V TDK ceramic capacitor at the output Notes Vin=5V, lo=lomax full load Over all operating input voltages, resistive loads and temperature conditions Io=Io, min to Io, max Vin=Vin, min to Vin, max Tref=Ta, min to Ta, max
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Output Specifications (continued)
Parameter Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time VO=0.75V VO=1.2V VO=1.5V VO=1.8V VO=2.5V 130mV 50uS 130mV 50uS 120mV 50uS 120mV 50uS 120mV 50uS 120mV 50uS 130mV 50uS 130mV 50uS 120mV 50uS 140mV 50uS di/dt=2.5A/uS; Vin=5V; and with two 150uF/16V tantalum capacitors & 1uF/10V ceramic capacitor at the output Min Typ Max Notes
Note: All specifications are typical at nominal input (Vin=5V), full load at 25C unless otherwise stated.
General Specifications
Parameter Efficiency Vo=3.3V Vo=2.5V Vo=1.8V Vo=1.5V Vo=1.2V Vo=0.75V Switching Frequency Over Temperature Shutdown Output Trim Range (Wide Trim) Remote Sense Compensation MTBF Dimensions Inches (L x W x H) Millimeters (L x W x H) Weight 1.30 x 0.53 x 0.315 33.02 x 13.46 x 8.00 6.6g 92% 90% 88% 87% 85% 79% 250KHz 0.7525V 95% 93% 91% 90% 88% 82% 300KHz 125C 10% 6,643,156 hours 350KHz 3.63V Measured at Vin=5V, full load Min Typ Max Notes
Calculated Per Bell Core TR-332 (IO = Nominal; Ta = 25C)
-
Note: All specifications are typical at 25C unless otherwise stated.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Control Specifications
Parameter Signal Low (Unit Off) Signal High (Unit On) Signal Low (Unit On) Signal High (Unit Off) Sequencing Voltage Sequencing Slew Rate Capability Sequencing Delay Time Tracking Accuracy Power-Up Power-Down 100mV 200mV 200mV 400mV Min -0.3V 1.5V -0.3V 1.5V 0.05V 10mS Typ Max 0.3V 5.8V 0.3V 5.8V Vin 2V/mS Delay from Vin, min to application of voltage on SEQ pin Notes S7BC-10F2A0; Remote On/Off pin open, Unit on. S7BC-10F2AL; Remote On/Off pin open, Unit on. Sequencing Voltage should be higher than output voltage.
Output Trim Equations
Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The Trim Up resistor should be connected between the Trim pin and Ground.
Vout
Rtrim =
21.07 - 5.11 Vadj - 0.7525
Module Trim
GND
Rtrim
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The Trim Up voltage should be connected between the Trim pin and Ground.
Vtrim = 0.7 - 0.1698 x (Vadj - 0.7525)
Module
Vout
Trim
Vtrim
GND
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Efficiency Data
3.3V Vout 97.0% 95.0% Efficiency
2.5V Vout
95.0% Efficiency 90.0% 85.0% 80.0% 75.0%
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
93.0% 91.0% 89.0% 87.0% 85.0% 4.5V 5.0V 5.5V
3.0V 3.3V 5.0V 5.5V
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Output Current (A)
Output Current (A)
Vo=3.3V
1.8V Vout
Vo=2.5V
1.5V Vout 95.0%
95.0%
90.0%
Efficiency
Efficiency
90.0% 85.0% 80.0% 75.0% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Output Current (A)
85.0% 80.0% 75.0% 70.0% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Output Current (A)
3.0V 3.3V 5.0V 5.5V
3.0V 3.3V 5.0V 5.5V
Vo=1.8V
1.2V Vout 95.0% 90.0% 85.0% Efficiency 80.0% 75.0% 70.0% 65.0% 60.0% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Output Current (A)
Efficiency 90.0% 85.0% 80.0%
Vo=1.5V
0.75V Vout
3.0V 3.3V 5.0V 5.5V
75.0% 70.0% 65.0% 60.0% 55.0% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
3.0V 3.3V 5.0V 5.5V
10.0
Output Current (A)
Vo=1.2V
Vo=0.7525V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Thermal Derating Curves
Vin=5.0V, Vo=0.75V
Vin=5.0V, Vo=1.5V
Vin=5.0V, Vo=2.5V
Vin=5.0V, Vo=3.3V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Thermal Derating Curves (continued)
Vin=3.3V, Vo=0.75V
Vin=3.3V, Vo=1.5V
Vin=3.3V, Vo=2.5V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4V-5.5V Input 0.75V-3.63V/10A Output
Pin Connections
Pin 1 2 3 4 5 6 7 Function Remote On/Off Vin SEQ Ground Vout Trim Remote Sense
BOTTOM VIEW
RECOMMENDED PAD LAYOUT
PAD SIZE: MIN: 0.14"* 0.095" (3.05mm * 2.41mm) MAX: 0.165"* 0.11" (3.43mm * 2.79mm)
2005 Bel Fuse Inc. Specifications subject to change without notice. 020405
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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