NON-ISOLATED DC/DC CONVERTERS 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output SRDB-12C1AH RoHS Compliant Rev.A • Non-Isolated • Remote On/Off (Active High Logic) • Fixed frequency (300 kHz) • Input Under-voltage Lockout (UVLO) • Low profile package (8.5 mm) • OCP/SCP • Remote Sense • Wide Trim Output Description The SRDB-12C1AH 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 8.5 mm. The output is widely trimmed from 0.9 Vdc to 2.5 Vdc, and the efficiency of 2.5 Vdc 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 V - 2.5 V Input Voltage 3.3 V Max. Output Current 12 A Max. Output Power 30 W Typical Efficiency 92% Model Number SRDB-12C1AH Notes: 1. Add “R” suffix at the end of the model number to indicate “Reel Packaging”, and “G” for “Tray Packaging”. 2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers. Absolute Maximum Ratings Parameter Input Voltage (continuous) Output Enable Terminal Voltage Ambient Temperature Storage Temperature Min -0.3 V -0.3 V -40 °C -55 °C Typ - Max 7V 3.9 V Notes 85 °C 100 °C Input Specifications Parameter Input Voltage Input Current (full load) Vo=2.5 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=1.0 V Vo=0.9 V Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Min 3V Typ 3.3 V Max 3.6 V - 10 mA 12.0 A 9.3 A 8.0 A 6.6 A 5.7 A 5.2 A 150 mA 20 mA - 80 mA 160 mA - 25 mA 50 mA I t Inrush Current Transient - 0.1 A s 0.2 A s Turn-on Voltage Threshold Turn-off Voltage Threshold - 2.85 V 2.3 V - Input Reflected Ripple Current (rms) 2 2 Notes Tested with simulated source impedance of 500 Hz to 20 MHz & two 270 uF/10 V Oscon capacitors with ESR=0.018 ohm max. at 100 kHz. 2 Note: All specifications are typical at 25 °C 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 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output Output Specifications Parameter Min Typ Max 2.450 V 1.764 V 1.470 V 1.176 V 0.980 V 0.882 V 2.500 V 1.800 V 1.500 V 1.200 V 1.000 V 0.900 V 2.550 V 1.836 V 1.530 V 1.224 V 1.020 V 0.918 V Line Regulation - 2 mV 5 mV Load Regulation - 4 mV 8 mV Regulation Over Temperature (-40 °C to +85 °C) Vo=2.5 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=1.0 V Vo=0.9 V - 19 mV 13 mV 11 mV 9 mV 6 mV 5 mV 38 mV 26 mV 22 mV 18 mV 12 mV 10 mV 0A - 12 A Current Limit Threshold 15.6 A - 30 A Ripple and Noise (rms) - 10 mV 25 mV - 35 mV 40 mV 40 mV 40 mV 35 mV 35 mV 75 mV 80 mV 80 mV 80 mV 75 mV 75 mV Short Circuit Surge Transient - 0.2 A s 0.4 A s Turn on Time - 10 mS 20 mS Overshoot at Turn on - 0% 3% Notes Output Voltage Set Point Vo=2.5 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=1.0 V Vo=0.9 V Output Current Ripple and Noise (pk-pk) Vo=2.5 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=1.0 V Vo=0.9 V Output Capacitance 2 0 uF Vin=3.3 V, full load. Test conditions: 0-20 MHz BW; 1 uFceramic capacitor & 10 uF aluminum capacitor at the output. 2 4800 uF Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot - 100 mV 140 mV - 50 uS 100 uS - 100 mV 140 mV Settling Time - 50 uS 100 uS Overshoot - 90 mV 130 mV Settling Time - 50 uS 100 uS - 90 mV 130 mV - 50 uS 100 uS Settling Time Overshoot Overshoot Settling Time VO=1.8 V - 2.5 V VO=0.9 V - 1.5 V Test conditions: di/dt=0.5 A/uS, Vin=3.3 V, with a 470 uF (ESR=0.9 ohm) tantalum capacitor at the output. Note: All specifications are typical at nominal input, full load at 25 °C 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 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output General Specifications Parameter Min Typ Max Switching Frequency 89% 85% 83% 80% 78% 77% 250 kHz 92% 88% 86% 83% 81% 80% 300 kHz 340 kHz Output Voltage Trim Range 0.855 V - 2.625 V - - 10% Notes Efficiency Vo=2.5 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=1.0 V Vo=0.9 V Remote Sense Compensation MTBF 5,443,290 hours Vin=3.3 V, full load Total adjustment of trim, setpoint and remote sense combined should not exceed 2.625 V. Vo=0.9 V when trim pin open Calculated Per Bell Core SR-332 (Vin=3.3 V; Vo=1.8 V, IO =9.6 A,; Ta = 25 °C) Dimensions Inches millimeters Weight - 1.22 x 0.827 x 0.345 31.0 x 21.0 x 8.75 10.5 g - Note: All specifications are typical at 25 °C unless otherwise stated. Control Specifications Parameter Min Typ Max -0.3 V - 0.8 V 2.8 V - 3.6 V Notes Remote On/Off Signal Low (Unit Off) Active High Signal High (Unit On) Remote on/off pin open, unit on. Output Trim Equations Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) 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 = 0.697 − 8.28 Vnom − Vadj Vout Module Rtrimdown Trim GND RTrimUp = 5.2 − 1.78 Vadj − Vnom Vout Module Trim Rtrimup Note: The output voltage Vnom = 0.907V. 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 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output Efficiency Data 98.0% 94.0% 96.0% 92.0% 94.0% 90.0% 92.0% 3.0V 90.0% 3.3V 88.0% 3.6V 88.0% 3.0V 86.0% 3.3V 3.6V 86.0% 84.0% 84.0% 82.0% 82.0% 80.0% 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 Vo = 2.5 V 6 7 8 9 10 11 12 Vo = 1.8 V 92.0% 92.0% 90.0% 90.0% 88.0% 88.0% 86.0% 86.0% 3.0V 3.3V 84.0% 3.0V 84.0% 82.0% 82.0% 3.6V 80.0% 3.3V 3.6V 80.0% 78.0% 76.0% 78.0% 74.0% 76.0% 72.0% 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 Vo = 1.5 V 5 6 7 8 9 10 11 12 Vo = 1.2 V 90.0% 88.0% 88.0% 86.0% 86.0% 84.0% 82.0% 84.0% 3.0V 80.0% 3.0V 78.0% 3.3V 78.0% 76.0% 3.6V 76.0% 74.0% 74.0% 72.0% 72.0% 70.0% 82.0% 3.3V 80.0% 3.6V 70.0% 68.0% 1 2 3 4 5 6 7 Vo = 1.0 V 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 Vo = 0.9 V 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 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A 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 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output Ripple and Noise Waveforms Ripple and noise at max load 2.5 Vdc output Ripple and noise at max load 1.8 Vdc output Ripple and noise at max load 1.5 Vdc output Ripple and noise at max load 1.2 Vdc output Ripple and noise at max load 1.0 Vdc output Ripple and noise at max load 0.9 Vdc output Note: Ripple and Noise with 1 uF ceramic capacitor and 10 uF aluminum electrolytic capacitor at the output, and Ta=25 deg C. 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 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output Transient Response Waveforms Transients 50% to 100% load 2.5 Vdc output Transients 100% to 50% load 2.5 Vdc output Transients 50% to 100% load 1.8 Vdc output Transients 100% to 50% load 1.8 Vdc output Transients 50% to 100% load 1.5 Vdc output Transients 100% to 50% load 1.5 Vdc output 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 CONVERTER 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output Transient Response Waveforms (continued) Transients 50% to 100% load 1.2 Vdc output Transients 100% to 50% load 1.2 Vdc output Transients 50% to 100% load 1.0 Vdc output Transients 100% to 50% load 1.0 Vdc output Transients 50% to 100% load 0.9 Vdc output Transients 100% to 50% load 0.9 Vdc output Note: Transient response at di/dt=0.5 A/uS, external load capacitor Co=470 uF (tantalum capacitor ESR=0.9 ohm), Ta=25 deg C. 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 CONVERTER 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/12 A Output Mechanical Outline Pin Connections Pin Function 1 GND 2 GND 3 GND 4 GND 5 Vin 6 Vin 7 Trim 8 Remote On/Off 9 Remote Sense(+) 10 Vo 11 Vo 12 Vo RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. These parts are not however compatible with the higher temperatures associated with lead free solder processes and must be soldered using a reflow profile with a peak temperature of no more than 240 ºC. ©2007 Bel Fuse Inc. Specifications subject to change without notice. 031907 CORPORATE FAR EAST EUROPE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 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 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