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NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A SRAH-03A / VRAH-03A 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
POWER PRODUCTS
BP05xRAH-03A
RoHS Compliant
Description
The Bel SRAH-03A and VRAH-03A modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 12V source. These converters are available in a range of output voltages from 1.5V to 5.0V. They are packaged in a compact, overmolded package rated at 3A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. Standard features include remote on/off, over current and short circuit protection, and output voltage adjust. These products may be used almost anywhere low voltage silicon is employed and a 12V 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 5.0V 3.3V 2.5V 1.8V 1.5V Input Voltage 12V 12V 12V 12V 12V Max. Output Current 3A 3A 3A 3A 3A Max. Output Power 15W 9.9W 7.5W 5.4W 4.5W Typical Efficiency 91% 90% 88% 85% 84% Part Number Surface Mount SRAH-03A500 SRAH-03A330 SRAH-03A250 SRAH-03A180 SRAH-03A150 Part Number Vertical Mount VRAH-03A500 VRAH-03A330 VRAH-03A250 VRAH-03A180 VRAH-03A150
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
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 -40 Typical Max 13.2 13.2 85 125 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 5.0V 3.3V 2.5V 1.8V 1.5V 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 8.0 All 3 30 140 0.005 9.4 9.0 10.0 0.01 Module All Symbol Vin Iin 1.7 1.2 0.9 0.75 0.6 100 10 mA mA mArms mApk A2s V V Min 10.8 Typical Max 13.2 Units V A
Note: Input capacitance 270F/16V, ESR = 0.03 max at 100kHz @ 25 C. 1. With simulated source impedance of 500nH, 5Hz to 20MHz.
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
12V Input / 1.5V - 5.0V Output / 3A Output Specifications
Parameter Output Voltage Set Point 1 5.0V 3.3V 2.5V 1.8V 1.5V Load Regulation 5.0V 3.3V 2.5V 1.8V 1.5V Line Regulation 5.0V 3.3V 2.5V 1.8V 1.5V Regulation Over Temperature 5.0V 3.3V 2.5V 1.8V 1.5V Total Output Voltage Regulation 5.0V 3.3V 2.5V 1.8V 1.5V Output Ripple and Noise 2 Output Ripple and Noise 2 Output Current Range Output DC Current Limit Shor t Circuit Surge Turn on Time Overshoot at Turn On 3 Output Capacitance All All All All All All All All Cout 0 Iout Ioutlim Ioutsurge Ton 0 3.6 0.35 12 0 40 27 16 13 13 40 10 62.5 51.5 35 25 25 100 20 3 7.5 0.7 20 3 1200 20 12 8 5 5 30 25 20 10 10 10 5 3 3 3 16 10 5 5 5 10 10 5 5 5 16.5 16.5 10 10 10 Module Symbol Vout 4.920 3.247 2.460 1.771 1.476 5.0 3.3 2.5 1.8 1.5 5.080 3.353 2.540 1.829 1.524 Min Typical Max
POWER PRODUCTS
BP05xRAH-03A
Units V
mV
mV
mV
mV
mVp-p mVrms A A A 2s ms % F
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 1. Vin = 12V, Iout = full load, Ta = 25 C. 2. 0 - 20 MHz, 0.1F ceramic cap on output. 3. Overshoot at turn on output capacitance is 100F.
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
Output Specifications
Parameter Transient Response
4
Module
Symbol
Min
Typical
Max
Units
V 50% to 100% of Max Load Settling Time 5.0V V 100% to 50% of Max Load Settling Time Transient Response
4
100 Ts 40 100 Ts 40
200 80 200 80
mV s mV s
V 50% to 100% of Max Load Settling Time 3.3V V 100% to 50% of Max Load Settling Time Transient Response
4
80 Ts 40 80 Ts 40
150 80 150 80
mV s mV s
V 50% to 100% of Max Load Settling Time 2.5V V 100% to 50% of Max Load Settling Time Transient Response
4
70 Ts 40 70 Ts 40
100 80 100 80
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
4
70 Ts 40 70 Ts 40
100 80 100 80
mV s mV s
V 50% to 100% of Max Load Settling Time 1.5V V 100% to 50% of Max Load Settling Time Ts Ts
70 40 70 40
100 80 100 80
mV s mV s
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 4. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
12V Input / 1.5V - 5.0V Output / 3A
POWER PRODUCTS
BP05xRAH-03A
General Specifications
Parameter Efficiency1 5.0V 3.3V 2.5V 1.8V 1.5V Switching Frequency 5.0V 3.3V 2.5V 1.8V 1.5V Output Voltage Trim Range2 Weight All All Fsw 470 340 270 270 270 90 4.9 500 370 300 300 300 530 400 330 330 330 110 % g Module Symbol 89 88 86 83 82 91 90 88 85 84 kHz Min Typical Max Units %
1. Vin=12V, full load and Ta=25 C. 2. See graphs on pages 11 - 13.
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 1 13.2 Min Typical Max Units V V V
3. With remote on/off pin 1 open, the module is on.
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
Efficiency Data
Module 5.0V 100%
Module 3.3V 100% 90% Efficiency
10.8V 12.0V 13.2V
90% Efficiency
80% 70% 60% 50% 0.30
80%
10.8V 12.0V 13.2V
70%
60% 0.30
0.75
1.50 Output Current
2.25
3.00
0.75
1.50 Output Current
2.25
3.00
Module 2.5V 100% 90% Efficiency 80% 70% 60% 50% 0.30 10.8V 12.0V 13.2V
0.75
1.50 Output Current
2.25
3.00
Module 1.8V
100% 90% Efficiency
Module 1.5V 100% 90% Efficiency
10.8V 12.0V 13.2V
80% 70% 60% 50% 40% 1 2 3 Output Current 4 5
80% 70% 60% 50% 40% 0.30
10.8V 12.0V 13.2V
0.75
1.50 Output Current
2.25
3.00
Note: On/off pin designed to work with an open collector/drain switch.
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05
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
12V Input / 1.5V - 5.0V Output / 3A
POWER PRODUCTS
BP05xRAH-03A
Ripple and Noise
0.1F ceramic cap added at the output.
Ripple and noise at full load and 12Vdc input, 5.0Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input, 3.3Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input, 2.5Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input, 1.8Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input, 1.5Vdc output and Ta=25 C
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05
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
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=5.0V 50% to 100% load transients at 12V input and Ta=25 C
Vout=5.0V 100% to 50% load transients at 12V input and Ta=25 C
Vout=3.3V 50% to 100% load transients at 12V input and Ta=25 C
Vout=3.3V 100% to 50% load transients at 12V input and Ta=25 C
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
12V Input / 1.5V - 5.0V Output / 3A
POWER PRODUCTS
BP05xRAH-03A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=2.5V 50% to 100% load transients at 12V input and Ta=25 C
Vout=2.5V 100% to 50% load transients at 12V input and Ta=25 C
Vout=1.8V 50% to 100% load transients at 12V input and Ta=25 C
Vout=1.8V 100% to 50% load transients at 12V input and Ta=25 C
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=1.5V 50% to 100% load transients at 12V input and Ta=25 C
Vout=1.5V 100% to 50% load transients at 12V input and Ta=25 C
Thermal Considerations
xRAH-03A500 xRAH-03A150 xRAH-03A180 xRAH-03A250 xRAH-03A330
Derating Curve 3 200LFM
100LFM Derating Curve 3 200LFM
Output Current (A)
2
Output Current (A)
2
1 Natural Convection 0
0 10 20 30 40 50 60 70 85
1
Natural Convection
0
0 10 20 30 40 50 60 70 85
Ambient Temperature, Ta (C) Output Current vs. Local Ambient Temperature and Air Velocity
Ambient Temperature, Ta (C) Output Current vs. Local Ambient Temperature and Air Velocity
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
12V Input / 1.5V - 5.0V Output / 3A
POWER PRODUCTS
BP05xRAH-03A
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
Output Voltage Set-Point Adjustment
300 Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150 120 90 60 30 0 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 Adjusted output voltage Vo,adj (V) 4.9 4.95 5
xRAH-03A500 Trim Resistor Calculation
Rtrim down =
(
23.703 - 13.87) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 5 5.05 5.1 5.15 5.2 5.25 5.3 5.35 Adjusted output voltage Vo,adj(V) 5.4 5.45 5.5
Rtrim up =
(
4.496 - 8.25) Kohm Vo, adj - Vo
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
Output Voltage Set-Point Adjustment
Trim resistor value Rtrim_down(Kohm)
300 270 240 210 180 150 120 90 60 30 0 2.97 3 3.04 3.07 3.1 3.13 3.17 3.2 3.23 Adjusted output voltage Vo,adj (V) 3.27 3.3
xRAH-03A330 Trim Resistor Calculation
Rtrim down =
(
7.92 - 4.38) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 3.3 3.33 3.37 3.4 3.43 3.46 3.5 3.53 Adjusted output voltage Vo,adj(V) 3.56 3.6 3.63
Rtrim up =
(
2.536 - 1.21) Kohm Vo, adj - Vo
300 Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150 120 90 60 30 0 2.25 2.27 2.3 2.33 2.35 2.38 2.4 2.42 2.45 Adjusted output voltage Vo,adj (V) 2.48 2.5
xRAH-03A250 Trim Resistor Calculation
Rtrim down =
(
3.694 - 7.77) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 2.5 2.52 2.55 2.58 2.6 2.63 2.65 2.67 Adjusted output voltage Vo,adj(V) 2.7 2.73 2.75
Rtrim up =
(
1.72 - 5.62) Kohm Vo, adj - Vo
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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
12V Input / 1.5V - 5.0V Output / 3A Output Voltage Set-Point Adjustment
300 Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150 120 90 60 30 0 1.62 1.64 1.66
POWER PRODUCTS
BP05xRAH-03A
xRAH-03A180 Trim Resistor Calculation
Rtrim down =
(
3.849 - 19.23) Kohm Vo - Vo, adj
1.67 1.69 1.71 1.73 1.75 1.76 Adjusted output voltage Vo,adj (V)
1.78
1.8
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 1.8 1.82 1.84 1.85 1.87 1.89 1.91 1.93 Adjusted output voltage Vo,adj(V) 1.94 1.96 1.98
Rtrim up =
(
3.064 - 15.4) Kohm Vo, adj - Vo
300 Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150 120 90 60 30 0 1.35 1.37 1.38 1.4 1.41 1.43 1.44 1.46 1.47 Adjusted output voltage Vo,adj (V) 1.49 1.5
xRAH-03A150 Trim Resistor Calculation
Rtrim down =
(
2.698 - 14.83) Kohm Vo - Vo, adj
300 Trim resistor value,Rtrim_up(Kohm) 270 240 210 180 150 120 90 60 30 0 1.5 1.51 1.53 1.54 1.56 1.58 1.59 1.61 Adjusted output voltage Vo,adj(V) 1.62 1.64 1.65
Rtrim up =
(
3.064 - 11) Kohm Vo, adj - Vo
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 13
POWER PRODUCTS
BP05xRAH-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A
Mechanical
SRAH-03A
Suggested PCB Pad Layout 0.400 [10.16] 0.065 [1.65]
0.60 [15.24]
0.050 [1.27]
0.855 [21.72]
0.110 [2.79]
0.70 [17.78]
R0.015 [R0.38] typ 0.100 [2.54] R0.008 [R0.20] typ
0.012 [0.30]
0-5
0.004 [0.10]
0.050 [1.27] 0.400 [10.16]
0.100 [2.54] 4x
0.320 [8.13] 0.020 [0.51]
0.055 [1.40] 2x 0.090 [2.29] 2x 0.780 [19.81]
Dimensions are in inches [millimeters]. Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
Pin 1 2 3 4 5 6 7
Function Remote On/Off +Vin Ground +Vo Trim No Connection No Connection
7
6
12345
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 14
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V - 5.0V Output / 3A Mechanical
VRAH-03A
0.700 [17.78]
POWER PRODUCTS
BP05xRAH-03A
0.600 [15.24]
0.050 [1.27]
0.265 [6.73] min
0.050 [1.27] 0.100 [2.54] 0.400 [10.16] 0.020 [0.51]
0.308 [7.82]
Dimensions are in inches [millimeters]. Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
Pin 1 2 3 4 5
Function Remote On/Off +Vin Ground +Vo Trim
12345
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 240C.
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05
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 15

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