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NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A SRAH-05C / VRAH-05C 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-05C
Description
The Bel SRAH-05C and VRAH-05C modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 3.3V source. These converters are available in a range of output voltages from 1.2V to 2.5V. They are packaged in a compact, overmolded package rated at 5A. 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 3.3V 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 2.5V 1.8V 1.5V 1.2V Input Voltage 3.3V 3.3V 3.3V 3.3V Max. Output Current 5A 5A 5A 5A Max. Output Power 12.5W 9.0W 7.5W 6W Typical Efficiency 91% 88% 86% 83% Part Number Surface Mount SRAH-05C250 SRAH-05C180 SRAH-05C150 SRAH-05C120 Part Number Vertical Mount VRAH-05C250 VRAH-05C180 VRAH-05C150 VRAH-05C120
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
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 6 6 85 105 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 2.5V 1.8V 1.5V 1.2V 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 2.6 2.5 All 3 30 100 0.0005 Module All Symbol Vin Iin 4.8 4.0 3.5 3.0 90 10 45 150 0.001 2.7 mA mA mArms mApk A2s V V Min 3 Typical Max 3.6 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. 03.05
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
3.3V Input / 1.2V - 2.5V Output / 5A
POWER PRODUCTS
BP05xRAH-05C
Output Specifications
Parameter Output Voltage Set Point 1 2.5V 1.8V 1.5V 1.2V Load Regulation Line Regulation Regulation Over Temperature Total Output Voltage Regulation Output Ripple and Noise 2 Output Ripple and Noise 2 Output Current Range Output DC Current Limit Shor t Circuit Surge 2.5V 1.8V 1.5V 1.2V Turn on Time Overshoot at Turn On Output Capacitance Transient Response 3 V 50% to 100% of Max Load Settling Time All V 100% to 50% of Max Load Settling Time Ts 80 80 170 120 mV s Ts 80 80 170 120 mV s All All All Cout 0 Ton All All All All All All All All Iout Ioutlim Ioutsurge 0.07 0.07 0.07 0.07 7 0 0.1 0.1 0.1 0.1 15 1 2200 ms % F 0 6 Module Symbol Vout 2.450 1.764 1.470 1.176 2.500 1.800 1.500 1.200 5 3 20 28 30 10 2.550 1.836 1.530 1.224 10 5 30 45 80 20 5 10 mV mV mV mV mVp-p mVrms A A A 2s Min Typical Max Units V
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 1. Vin = 3.3V, Iout = full load, Ta = 25 C. 2. 0 - 20MHz, 1F ceramic cap and 10F aluminum cap on output. 3. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
General Specifications
Parameter Efficiency1 2.5V 1.8V 1.5V 1.2V Switching Frequency Output Voltage Trim Range2 2.5V 1.8V 1.5V 1.2V Weight All 90 90 90 90 4.9 105 110 110 110 g All Fsw Module Symbol 89 86 84 81 570 91 88 86 83 600 630 kHz % Min Typical Max Units %
1. Vin=3.3V, full load and Ta=25 C. 2. See graphs on pages 10-12.
Control Specifications
Parameter Remote On/Off 3 Signal Low (Unit Off) Signal High (Unit On) Module All All All Symbol Vouten -0.3 1.8 1 3.6 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. 03.05
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
3.3V Input / 1.2V - 2.5V Output / 5A
POWER PRODUCTS
BP05xRAH-05C
Efficiency Data
Module 2.5V
Module 1.8V
96%
94% 92% Efficiency
3.0V 3.3V 3.6V
94% Efficiency 92% 90% 88% 86% 1 2 3 Output Current 4 5
90% 88% 86% 84% 82% 1 2 3 Output Current 4 5
3.0V 3.3V 3.6V
Module 1.5V
Module 1.2V
92% 90% 88% 86% 84% 82% 80% 1 2 3 Output Current 4 5
3.0V 3.3V 3.6V
89% 88% 87% 86% 85% 84% 83% 82% 81% 80% 79% 78% 1 2 3 Output Current 4 5
Efficiency
Efficiency
3.0V 3.3V 3.6V
Note: On/off pin designed to work with an open collector/drain switch.
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
Ripple and Noise
1F ceramic cap and 10F aluminum cap added at the output.
Ripple and noise at full load and 3.3Vdc input, 2.5Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc input, 1.8Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc input, 1.5Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc input, 1.2Vdc output and Ta=25 C
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
3.3V Input / 1.2V - 2.5V Output / 5A
POWER PRODUCTS
BP05xRAH-05C
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=2.5V 50% to 100% load transients at 3.3V input and Ta=25 C
Vout=2.5V 100% to 50% load transients at 3.3V input and Ta=25 C
Vout=1.8V 50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.8V 100% to 50% load transients at 3.3V input and Ta=25 C
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=1.5V 50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.5V 100% to 50% load transients at 3.3V input and Ta=25 C
Vout=1.2V 50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.2V 100% to 50% load transients at 3.3V input and Ta=25 C
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
3.3V Input / 1.2V - 2.5V Output / 5A Thermal Considerations
SRAH-05C
POWER PRODUCTS
BP05xRAH-05C
VRAH-05C
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
Output Voltage Set-Point Adjustment
xRAH-05C250 Trim Resistor Calculation
Rtrim down =
(
9.5565 - 20.32) Kohm Vo - Vo, adj
Rtrim up =
(
4.496 - 14.7) Kohm Vo, adj - Vo
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
3.3V Input / 1.2V - 2.5V Output / 5A Output Voltage Set-Point Adjustment
xRAH-05C180 Trim Resistor Calculation
POWER PRODUCTS
BP05xRAH-05C
Rtrim down =
(
3.8488 - 18.54) Kohm Vo - Vo, adj
Rtrim up =
(
3.064 - 14.7) Kohm Vo, adj - Vo
x7AH-05C150 Trim Resistor Calculation
Rtrim down =
(
2.6977 - 15.33) Kohm Vo - Vo, adj
Rtrim up =
(
3.064 - 11.5) Kohm Vo, adj - Vo
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
Output Voltage Set-Point Adjustment
xRAH-05C120 Trim Resistor Calculation
Rtrim down =
(
0.8501 - 6.79) Kohm Vo - Vo, adj
Rtrim up =
(
1.72 - 4.64) Kohm Vo, adj - Vo
(c)2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
3.3V Input / 1.2V - 2.5V Output / 5A Mechanical
SRAH-05C
POWER PRODUCTS
BP05xRAH-05C
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. 03.05
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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V - 2.5V Output / 5A
0.700 [17.78]
Mechanical
VRAH-05C
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. 03.05
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 14

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