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NON-ISOLATED DC/DC CONVERTERS
5.0V Input 0.9V to 3.3V/12A Output
S7DB-12B1Ax
* * * * Non-Isolated Fixed frequency (300kHz) Low profile package (8.5mm) Remote Sense * * * * Remote On/Off Input Under-voltage Lockout (UVLO) OCP/SCP Wide Trim Range/output
Description
The S7DB-12B1Ax is part of the low cost non-isolated DC/DC power converter series. The module uses a DIP package for ease of layout and space savings, with a low profile of 8.5mm. The output is widely trimmed from 0.9V to 3.3V, and the efficiency of 3.3V output module is typically 92% at full load. Features include remote sense, remote on/off, short circuit protection, over current protection and input under-voltage lockout.
Part Selection
Output Voltage 0.9 - 3.3V Input Voltage 5V Max. Output Current 12A Max. Output Power 39.6W Typical Efficiency 92% Model Number Active High S7DB-12B1AH Model Number Active Low S7DB-12B1A0
Note: Add "R" suffix at the end of the model number to indicate "Reel Packaging", and "G" for "Tray Packaging".
Absolute Maximum Ratings
Parameter Input Voltage (continuous) Output Enable Terminal Voltage Ambient Temperature Storage Temperature Min -0.3V -0.3V -40C -55C Typ Max 6V 6V 85C 100C Notes
Input Specifications
Parameter Input Voltage Input Current (full load) Vo=3.3V Vo=2.5V Vo=1.8V Vo=1.5V Vo=1.2V Vo=1.0V Vo=0.9V 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 -
Typ 5.0V 70mA 10mA 140mA 40mA 0.1A s 4.3V 3.85V
2
Max 5.5V 11.2A 8.7A 6.6A 5.5A 4.5A 3.5A 3.2A 100mA 20mA 280mA 80mA 0.2A s 4.5V 4.49V
2
Notes
Tested with simulated source impedance of 500Hz to 20MHz & two 270uF/10V Oscon capacitors with ESR=0.018 ohm max. at 100KHz
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
5.0V Input 0.9V to 3.3V/12A Output
Output Specifications
Parameter Output Voltage Set Point Vo=3.3V Vo=2.5V Vo=1.8V Vo=1.5V Vo=1.2V Vo=1.0V Vo=0.9V Min 3.234V 2.450V 1.764V 1.470V 1.176V 0.980V 0.882V 0A 15.6A 0uF Typ 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 2mV 6mV 6mV 22mV 17mV 12mV 10mV 8mV 7mV 6mV 10mV 30mV 0.25A s 2 0.3A s 2 0.35A s 2 0.4A s 2 0.4A s 2 0.45A s 2 0.45A s 12mS 0%
2
Max 3.366V 2.550V 1.836V 1.530V 1.224V 1.020V 0.918V 5mV 12mV 10mV 45mV 34mV 25mV 20mV 17mV 15mV 13mV 12A 30A 25mV 60mV 0.5A s 2 0.6A s 2 0.7A s 0.8A2s 2 0.8A s 2 0.9A s 2 0.9A s 20mS 3% 4800uF 115mV 100uS 115mV 100uS 120mV 70uS 120mV 70uS 120mV 50uS 120mV 50uS 150mV 130uS 150mV 130uS 150mV 100uS 150mV 100uS 150mV 80uS 150mV 80uS
2
Notes
Vin=5V, full load
Line Regulation Load Regulation
Vo=2.5V-3.3V Vo=0.9V-1.8V Regulation Over Temperature (-40C to +85C) Vo=3.3V Vo=2.5V Vo=1.8V Vo=1.5V Vo=1.2V Vo=1.0V Vo=0.9V Output Current Current Limit Threshold Ripple and Noise (RMS) Ripple and Noise (pk-pk) Short Circuit Surge Transient Vo=3.3V Vo=2.5V Vo=1.8V Vo=1.5V Vo=1.2V Vo=1.0V Vo=0.9V Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time
Test conditions: two 270uF/10V with ESR=0.018 ohm max at the input; 0-20MHz BW; 1uFceramic capacitor & 10uF aluminum capacitor at the output.
VO=3.3V VO=2.5V VO=1.8V -
Test conditions: di/dt=0.5A/uS, Vin=5V, without external capacitance
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
5.0V Input 0.9V to 3.3V/12A Output
Output Specifications (continued)
Parameter Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time VO=0.9V VO=1.0V VO=1.2V VO=1.5V 115mV 40uS 115mV 40uS 110mV 35uS 110mV 35uS 110mV 35uS 110mV 35uS 100mV 30uS 100mV 30uS 150mV 70uS 150mV 70uS 140mV 70uS 140mV 70uS 140mV 70uS 140mV 70uS 130mV 50uS 130mV 50uS Test conditions: di/dt=0.5A/uS, Vin=5V, without external capacitance Min Typ Max Notes
Note: All specifications are typical 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=1.0V Vo=0.9V Switching Frequency Output Voltage Trim Range Remote Sense Compensation MTBF Dimensions Inches millimeters Weight 1.22 x 0.67 x 0.345 31.0 x 17.0 x 8.75 10.5g 1
Min 89% 87% 83% 81% 79% 77% 76% 260KHz 0.855V -
Typ 92% 90% 86% 84% 82% 80% 79% 300KHz 5,782,475 hours
Max 340KHz 3.63V 10%
Notes
Vin=5V, full load
Vo=0.9V when trim pin is open.
Calculated Per Bell Core TR-332 (IO =9.6A, Vin=5V; Ta = 25C)
Notes: All specifications are typical at 25C unless otherwise stated. 1. Total adjustment of trim, setpoint and remote sense combined should not exceed 3.63V.
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
5.0V Input 0.9V to 3.3V/12A Output
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) Signal Low (Unit On) Signal High (Unit Off) S7DB-12B1AH S7DB-12B1A0 0V 2.5V 0V 2.5V 1V 5.5V 1V 5.5V Min Typ Max Notes
Remote on/off pin open, unit on.
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) are shown below. The Trim Down resistor should be connected between the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the resistors should be used for any given application.
RTrimDown =
1330 Vadj - 1064 90.64 - 100 Vadj
Vout
- 3.65
Rtrimdown Module Trim GND
Vout
RTrimUp =
1064 - 3.65 100 Vadj - 90.64
Module
Trim Rtrimup GND
Note: It is strongly recommended that the Trim Resistor be placed as near to the module as possible, otherwise it may cause regulation problem.
Efficiency Data
98.00% 96.00% 94.00% 92.00% 90.00% 88.00% 86.00% 1 2 3 4 5 6 7 8 9 10 11 12 4.5V 5.0V 5.5V
98.00% 96.00% 94.00% 92.00% 90.00% 88.00% 86.00% 1 2 3 4 5 6 7 8 9 10 11 12 4.5V 5.0V 5.5V
Vo = 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
5.0V Input 0.9V to 3.3V/12A Output
Efficiency Data (continued)
96.00% 94.00% 92.00% 90.00% 88.00% 86.00% 84.00% 82.00% 80.00% 1 2 3 4 5 6 7 8 9 10 11 12 4.5V 5.0V 5.5V
94.00% 92.00% 90.00% 88.00% 86.00% 84.00% 82.00% 80.00% 1 2 3 4 5 6 7 8 9 10 11 12 4.5v 5.0v 5.5v
Vo = 1.8V
94.00% 92.00% 90.00% 88.00% 86.00% 84.00% 82.00% 80.00% 78.00% 76.00% 74.00% 1 2 3 4 5 6 7 8 9 10 11 12 4.5v 5.0v 5.5v
92.00% 90.00% 88.00% 86.00% 84.00% 82.00% 80.00% 78.00% 76.00% 74.00% 72.00%
Vo = 1.5V
4.5v 5.0v 5.5v
1
2
3
4
5
6
7
8
9
10 11 12
Vo = 1.2V
90.00% 88.00% 86.00% 84.00% 82.00% 80.00% 78.00% 76.00% 74.00% 72.00% 70.00% 1 2 3 4 5 6 7 8 9 10 11 12 4.5v 5.0v 5.5v
Vo = 1.0V
Vo = 0.9V
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
5.0V Input 0.9V to 3.3V/12A Output
Thermal Derating Curve
Test Condition: Derating curve is tested at nominal input voltage.
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
5.0V Input 0.9V to 3.3V/12A Output
Pin Connections
Pin 1 2 3 4 5 6 7 8 9 10 11 12 Function GND GND GND GND Vin Vin Trim Remote On/Off Remote Sense(+) Vo Vo Vo
2004 Bel Fuse Inc. Specifications subject to change without notice. 112604
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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