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NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A S7AH-05B / V7AH-05B 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
BP02x7AH-05B
Description
The Bel S7AH-05B and V7AH-05B modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 5V source. These converters are available in a range of output voltages from 1.2V to 3.3V. 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 5V 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 3.3V 2.5V 1.8V 1.5V 1.2V Input Voltage 5V 5V 5V 5V 5V Max. Output Current 5A 5A 5A 5A 5A Max. Output Power 16.5W 12.5W 9.0W 7.5W 6W Typical Efficiency 92% 90% 86% 84% 82% Part Number Surface Mount S7AH-05B330 S7AH-05B250 S7AH-05B180 S7AH-05B150 S7AH-05B120 Part Number Vertical Mount V7AH-05B330 V7AH-05B250 V7AH-05B180 V7AH-05B150 V7AH-05B120
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V 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 0 -40 Typical Max 6 6 70 100 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 3.3V 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 4.19 All 30 4 30 100 0.02 4.3 3.9 8 60 150 0.05 4.5 4.49 Module All Symbol Vin Iin 4.6 3.6 2.7 2.3 1.9 mA mA mArms mApk A2s V V Min 4.5 Typical Max 5.5 Units V A
Note: Input capacitance one 270F/16V, ESR = 0.018 max at 100kHz @ 25 C. 1. With simulated source impedance of 500nH, 5Hz to 20MHz.
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
5V Input / 1.2V - 3.3V Output / 5A Output Specifications
Parameter Output Voltage Set Point 1 3.3V 2.5V 1.8V 1.5V 1.2V Load Regulation 3.3V 2.5V 1.8V 1.5V 1.2V Line Regulation 3.3V 2.5V 1.8V 1.5V 1.2V Regulation Over Temperature 3.3V 2.5V 1.8V 1.5V 1.2V Total Output Voltage Regulation 3.3V 2.5V 1.8V 1.5V 1.2V Output Ripple and Noise 2 Output Ripple and Noise 2 Output Current Range Output DC Current Limit Shor t Circuit Surge 3.3V 2.5V 1.8V 1.5V 1.2V Turn on Time Overshoot at Turn On Output Capacitance All All All Cout 0 Ton All All All All Iout Ioutlim Ioutsurge 0.08 0.05 0.05 0.05 0.05 12 0 0.2 0.1 0.1 0.1 0.1 20 3 2000 0 6.5 50 15 58 50 41 38 35 100 25 5 12.5 20 20 10 10 8 33 25 18 15 12 3.0 3.0 3.0 3.0 3.0 10 10 8 8 8 6.0 6.0 6.0 6.0 6.0 15 15 15 15 15 Module Symbol Vout 3.234 2.45 1.764 1.47 1.176 3.3 2.5 1.8 1.5 1.2 3.366 2.55 1.836 1.53 1.224 Min Typical Max
POWER PRODUCTS
BP02x7AH-05B
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 = 5V, Iout = full load, Ta = 25 C. 2. 0 - 20MHz, 1F ceramic cap and 10F aluminum cap on output.
(c)2003 Bel Fuse Inc. Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A
Output Specifications
Parameter Transient Response
3
Module
Symbol
Min
Typical
Max
Units
V 50% to 100% of Max Load Settling Time 3.3V V 100% to 50% of Max Load Settling Time Transient Response
3
120 Ts 25 120 Ts 25
165 50 165 50
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
3
100 Ts 25 100 Ts 25
150 50 150 50
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
3
100 Ts 25 100 Ts 25
150 50 150 50
mV s mV s
V 50% to 100% of Max Load Settling Time 1.5V V 100% to 50% of Max Load Settling Time Transient Response
3
100 Ts 25 100 Ts 25
150 50 150 50
mV s mV s
V 50% to 100% of Max Load Settling Time 1.2V V 100% to 50% of Max Load Settling Time Ts Ts
100 25 100 25
150 50 150 50
mV s mV s
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 3. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
5V Input / 1.2V - 3.3V Output / 5A
POWER PRODUCTS
BP02x7AH-05B
General Specifications
Parameter Efficiency1 3.3V 2.5V 1.8V 1.5V 1.2V Switching Frequency Output Voltage Trim Range2 Weight All All All Fsw Module Symbol 89 87 83 81 79 260 90 4.7 92 90 86 84 82 300 340 110 kHz % Min Typical Max Units %
g
1. Vin=5V, full load and Ta=25 C. 2. See graphs on pages 10-12.
Control Specifications
Parameter Remote On/Off 3 Signal Low (Unit On) Signal High (Unit Off) Module All All All Symbol Vouten 0 2.8 1 5.5 Min Typical Max Units V V V
3. With remote on/off pin 1 open, the module is on.
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A
Efficiency Data
Module 3.3V 97% Efficiency
Efficiency 95% 94%
Module 2.5V
96% 95% 94% 93% 92% 1 2 3 4 5 6 Output Current 4.5V 5.0V 5.5V
93% 92% 91% 90% 1 2 3 4 5 6 Output Current
4.5V 5.0V 5.5V
Module 1.8V 93% 92% 91% 90% 89% 88% 87% 86% 1 2 3 4 5 6 Output Current Efficiency 4.5V 5.0V 5.5V
Efficiency 92% 91% 90% 89% 88% 87% 86% 85% 1 2
Module 1.5V
4.5V 5.0V 5.5V
3
4
5
6
Output Current
Module 1.2V 88% 87% 86% 85% 84% 83% 82% 81% 1 2 3 4 5 6 Output Current
(c)2003 Bel Fuse Inc. Specifications subject to change without notice. 10.03
Efficiency
4.5V 5.0V 5.5V
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
5V Input / 1.2V - 3.3V Output / 5A Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
POWER PRODUCTS
BP02x7AH-05B
Ripple and noise at full load and 5Vdc input, 3.3Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 2.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.8Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.2Vdc output and Ta=25 C
(c)2003 Bel Fuse Inc. Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=3.3V 50% to 100% load transients at 5V input and Ta=25 C
Vout=3.3V 100% to 50% load transients at 5V input and Ta=25 C
Vout=2.5V 50% to 100% load transients at 5V input and Ta=25 C
Vout=2.5V 100% to 50% load transients at 5V input and Ta=25 C
Vout=1.8V 50% to 100% load transients at 5V input and Ta=25 C
(c)2003 Bel Fuse Inc. Specifications subject to change without notice. 10.03
Vout=1.8V 100% to 50% load transients at 5V input and Ta=25 C
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
5V Input / 1.2V - 3.3V Output / 5A
POWER PRODUCTS
BP02x7AH-05B
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=1.5V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.5V 100% to 50% load transients at 5V input and Ta=25 C
Vout=1.2V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.2V 100% to 50% load transients at 5V input and Ta=25 C
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A
Thermal Considerations
S7AH-05B
V7AH-05B
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
5V Input / 1.2V - 3.3V Output / 5A
POWER PRODUCTS
BP02x7AH-05B
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
Output Voltage Set-Point Adjustment
x7AH-05B330 Trim Resistor Calculation
Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 2.97 3 3.04 3.07 3.1 3.13 3.17 3.2 Adjusted output voltage Vo,adj (V) 3.23 3.27 3.3
Rtrim down =
(
7.914 - 8.27) Kohm Vo - Vo, adj
Trim resistor value,Rtrim_up(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 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 =
(
2.528 - 5.11) Kohm Vo, adj - Vo
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A
Output Voltage Set-Point Adjustment
Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 2.25 2.27 2.3 2.33 2.35 2.38 2.4 2.42 Adjusted output voltage Vo,adj (V) 2.45 2.48 2.5
x7AH-05B250 Trim Resistor Calculation
Rtrim down =
(
3.664 - 6.79) Kohm Vo - Vo, adj
Trim resistor value,Rtrim_up(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 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 - 4.64) Kohm Vo, adj - Vo
300
Trim resistor value Rtrim_down(Kohm)
270.1 240.2 210.3 180.4 150.5 120.6 90.7 60.8 30.9 1 1.62 1.64 1.66 1.67 1.69 1.71 1.73 1.75 1.76 Adjusted output voltage Vo,adj (V) 1.78 1.8
x7AH-05B180 Trim Resistor Calculation
Rtrim down =
(
1.509 - 5.52) Kohm Vo - Vo, adj
300
Trim resistor value,Rtrim_up(Kohm)
270.1 240.2 210.3 180.4 150.5 120.6 90.7 60.8 30.9 1 1.8 1.82 1.83 1.85 1.86 1.88 1.9 1.91 1.93 Adjusted output voltage Vo,adj(V) 1.94 1.96
Rtrim up =
(
1.2 - 4.02) Kohm Vo, adj - Vo
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
5V Input / 1.2V - 3.3V Output / 5A Output Voltage Set-Point Adjustment
Trim resistor value Rtrim_down(Kohm) 270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.35 1.37 1.38
POWER PRODUCTS
BP02x7AH-05B
x7AH-05B150 Trim Resistor Calculation
Rtrim down =
(
2.702 - 11.7) Kohm Vo - Vo, adj
1.4 1.41 1.43 1.44 1.46 Adjusted output voltage Vo,adj (V)
1.47
1.49
1.5
270 Trim resistor value,Rtrim_ up(Kohm) 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.5 1.51 1.53 1.54 1.56 1.58 1.59 1.61 Adjus ted output voltage Vo,adj(V) 1.62 1.64 1.65
Rtrim up =
(
3.064 - 7.87) Kohm Vo, adj - Vo
Trim resistor value Rtrim_down(Kohm)
270 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.08 1.09 1.1 1.12 1.13 1.14 1.15 1.16 1.18 1.19 1.2
x7AH-05B120 Trim Resistor Calculation
Rtrim down =
Adjusted output voltage Vo,adj (V)
(
1.545 - 8.47) Kohm Vo - Vo, adj
270 Trim resistor value,Rtrim_up(Kohm) 240 210 180 150.01 120.01 90.01 60.01 30.01 0.01 1.2 1.21 1.22 1.24 1.25 1.26 1.27 1.28 1.3 1.31 1.32
Rtrim up =
(
3.064 - 4.64) Kohm Vo, adj - Vo
Adjusted output voltage Vo,adj(V)
(c)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
BP02x7AH-05B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 1.2V - 3.3V Output / 5A
Mechanical
S7AH-05B
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)2003 Bel Fuse Inc.
Specifications subject to change without notice. 10.03
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
5V Input / 1.2V - 3.3V Output / 5A Mechanical
V7AH-05B
POWER PRODUCTS
BP02x7AH-05B
0.700 [17.78]
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
(c)2003 Bel Fuse Inc. Specifications subject to change without notice. 10.03
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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