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NON-ISOLATED DC/DC CONVERTERS
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/3 A Output
xRAH-03C Series
* * * * * Non-Isolated High Efficiency Low Cost
RoHS Compliant
* * * * * OCP/SCP
Rev.A
Wide Range Trim Remote On/Off Industrial Temperature Range UL60950-1 Recognized (UL/cUL)
Excellent Thermal Performance Input Under Voltage Lockout
Description
The Bel xRAH-03C1A0 modules are a series of non-isolated, step down dc/dc converters that operate from a nominal 3.3 Vdc source. These converters are available in a range of output voltages from 0.9 Vdc to 2.5 Vdc. It is packaged in a compact, overmolded package rated at 3 A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. The output is closely regulated and the efficiency for 2.5 Vdc output is typically 93% at full load. Typical features include remote on/off, input under voltage lockout, over current protection and short circuit protection.
Part Selection
Output Voltage 0.9 Vdc - 2.5 Vdc 2.5 Vdc 1.8 Vdc 1.5 Vdc 1.2 Vdc 0.9 Vdc Input Voltage 3.3 Vdc 3.3 Vdc 3.3 Vdc 3.3 Vdc 3.3 Vdc 3.3 Vdc Max. Output Current 3A 3A 3A 3A 3A 3A Max. Output Power 7.5 W 7.5 W 5.4 W 4.5 W 3.6 W 2.7 W Typical Efficiency 93% 93% 89% 87% 84% 81% Part Number Surface Mount SRAH-03C1A0 SRAH-03C250 SRAH-03C180 SRAH-03C150 SRAH-03C120 SRAH-03C090 Part Number Vertical Mount VRAH-03C1A0 VRAH-03C250 VRAH-03C180 VRAH-03C150 VRAH-03C120 VRAH-03C090
Notes: 1. Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "R" for "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 6V 6V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage Input Current (no load) Input Current (full load) VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Remote Off Input Current 7 mA 3.1 A 2.3 A 1.9 A 1.6 A 1.2 A 14 mA Min 3V Typ Max 3.6 V 110mA Notes
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/3 A Output
Input Specifications (continued)
Parameter Input Reflected Ripple Current (pk-pk) Min Typ 50 mA Max 100 mA Notes With simulated source impedance of 500 nH, 5 Hz to 20 MHz; use a 270 uF/6.3 V capacitor with ESR=0.03 ohm max, at 100 kHz.
Input Reflected Ripple Current (rms) I t Inrush Current Transient Turn on Voltage Threshold Turn off Voltage Threshold
2
-
15 mA 0.01 A s 2.7 V 2.4 V
2
25 mA 0.02 A s 2
Note: All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Line Regulation VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Load Regulation VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V 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=0.9 V Output Current Current Limit Threshold Short Circuit Surge Transient VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V 1 mV 1 mV 1 mV 1 mV 1 mV 5 mV 5 mV 5 mV 5 mV 5 mV 1 mV 1 mV 1 mV 1 mV 1 mV 5 mV 5 mV 5 mV 5 mV 5 mV 2.450 V 1.764 V 1.470 V 1.176 V 0.882 V 2.5 V 1.8 V 1.5 V 1.2 V 0.9 V 2.550 V 1.836 V 1.530 V 1.224 V 0.918 V Test conditions: Vin=3.3 V, Io= full load Min Typ Max Notes
0A 5A
10 mV 10 mV 10 mV 10 mV 10 mV 0.04 A s 2 0.04 A s 2 0.04 A s 2 0.04 A s 2 0.04 A s
2
20 mV 20 mV 20 mV 20 mV 20 mV 3A 9A 0.08 A s 2 0.08 A s 2 0.08 A s 2 0.08 A s 2 0.08 A s
2
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/3 A Output
Output Specifications (continued)
Parameter Ripple and Noise (rms) VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Ripple and Noise (pk-pk) VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V 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 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 Overshoot Settling Time Overshoot Settling Time VO=0.9 V VO=1.2 V VO=1.5 V VO=1.8 V VO=2.5 V 100 mV 30 uS 100 mV 30 uS 100 mV 30 uS 100 mV 30 uS 90 mV 30 uS 90 mV 30 uS 90 mV 30 uS 90 mV 30 uS 90 mV 30 uS 90 mV 30 uS 130 mV 60 uS 130 mV 60 uS 130 mV 60 uS 130 mV 60 uS 120 mV 60 uS 120 mV 60 uS 120 mV 60 uS 120 mV 60 uS 120 mV 60 uS 120 mV 60 uS Test conditions: di/dt=0.5 A/us, Vin=3.3 V, without any external capacitor at the output. 0 uF 45 mV 45 mV 45 mV 45 mV 45 mV 7 mS 0% 70 mV 70 mV 70 mV 70 mV 70 mV 15 mS 1% 1200 uF 10 mV 10 mV 10 mV 10 mV 10 mV 20 mV 20 mV 20 mV 20 mV 20 mV Min Typ Max Notes
Test conditions: 0-20 MHz BW; 0.1 uF ceramic capacitor and 10 uF 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/3 A Output
General Specifications
Parameter Efficiency VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Switching Frequency Output Trim Range (wide trim) Output Trim Range (narrow trim) Vo=1.2 V - 2.5 V Vo=0.9 V MTBF Dimensions (surface mount) Inches (L x W x H) Millimeters (L x W x H) Dimensions (vertical) Inches (L x W x H) Millimeters (L x W x H) Weight 90% 86% 84% 81% 78% 250 kHz 0 90%Vo 93% 89% 87% 84% 81% 300 kHz 3,131,719 hours 0.78 x 0.70 x 0.32 19.81 x 17.78 x 8.13 0.70 x 0.308 x 0.65 17.78 x 7.82 x 16.51 5g 340 kHz 292%VO 110%Vo 110%Vo Calculated Per Bell Core SR-332 (IO = Nominal; Ta = 25 C) Vo=0.9 V Measured at Vin=3.3 V, full load and Ta=25 C Min Typ Max Notes
Note: All specifications are typical at 25 C unless otherwise stated.
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) -0.3 V 1.8 V 0.3 V 3.6 V Min Typ Max Notes
Remote on/off pin open, unit on.
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/3 A Output
Output Trim Equations
Equations for calculating the trim resistor (in k) 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.
Vout
A -B Rtrimdown = Vnom - Vadj
Rtrimdown Module Trim GND
C Rtrimup = -D Vadj - Vnom
Vout Module Trim Rtrimup GND
Vnom 0.9 - 2.5 2.5 1.8 1.5 1.2 0.9
A N/A 7.9117 4.6538 3.2633 1.8699 N/A
B N/A 16.14 20.84 16.14 11.45 N/A
C 3.712 3.712 3.712 3.712 3.712 3.712
D 1.54 11.5 16.2 11.5 6.81 33.2
Notes Vo=0.9 V when Rtrim is open Vo=2.505 V when Rtrim is open Vo=1.803 V when Rtrim is open Vo=1.503 V when Rtrim is open Vo=1.203 V when Rtrim is open Vo=0.903 V when Rtrim is open
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/3 A Output
Efficiency Data
MODULE 2.5V EFFICIENCY
EFFICIENCY
MODULE 1.8V 100% 90% 80% 70% 60% 0.3 0.75 1.5 2.25 3 3.0V 3.3V 3.6V
100% 90% 80% 70% 60% 0.3 0.75 1.5 2.25 OUTPUT CURRENT 3 3.0V 3.3V 3.6V
OUTPUT CURRENT
MODULE 1.5V 100% 90% 80% 70% 60% 50% 0.3 0.75 1.5 2.25 3 OUTPUT CURRETN
MODULE 1.2V 100% 90% 80% 70% 60% 50% 0.3 0.75 1.5 2.25 3 OUTPUT CURRENT EFFICIENCY
EFFICIENCY
3.0V 3.3V 3.6V
3.0V 3.3V 3.6V
MODULE 0.9V EFFICIENCY 100% 80% 60% 40% 0.3 0.75 1.5 2.25 3 OUTPUT CURRENT 3.0V 3.3V 3.6V
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/3 A Output
Thermal Derating Curve
Ripple and Noise Waveform
Ripple and noise at full load, 3.3 V input, 2.5 V output Note: Ripple and Noise with 0.1 uF/16 V X7R ceramic capacitor and 10 uF tantalum capacitor at the output, 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/3 A Output
Transient Response Waveforms
50% to 100% load Transient at 3.3 V input, 2.5 V output
100% to 50% load Transient at 3.3 V input, 2.5 V output
Note: Transient Response at di/dt=0.5A/uS, 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/3 A Output
Mechanical Outline
SRAH-03C1A0
Pin Connections
Pin 1 2 3 4 5 6 7 Function Remote On/Off (option) Vin Ground Vout Trim (option) N/A N/A
Pin Connections
VRAH-03C1A0
Pin 1 2 3 4 5 Function Remote On/Off (option) Vin Ground Vout Trim (option)
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 C.
(c)2007 Bel Fuse Inc. Specifications subject to change without notice. 010807
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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