BEL VRAH

NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
SRAH-08B / VRAH-08B Series
RoHS Compliant
•
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
Description
The Bel SRAH-08B and VRAH-08B 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 0.9V to 3.3V. They are packaged
in a compact, overmolded package rated at 8A. 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, output voltage adjust and industrial temperature range (-40° to +85° C). The output is closely regulated and the
efficiency is typically 92% at full load. 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
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
3.3V
5V
8A
26.4W
92%
SRAH-08B330
VRAH-08B330
2.5V
5V
8A
20W
90%
SRAH-08B250
VRAH-08B250
1.8V
5V
8A
14.4W
86%
SRAH-08B180
VRAH-08B180
1.5V
5V
8A
12W
84%
SRAH-08B150
VRAH-08B150
1.2V
5V
8A
9.6W
82%
SRAH-08B120
VRAH-08B120
1.0V
5V
8A
8W
80%
SRAH-08B100
VRAH-08B100
0.9V
5V
8A
7.2W
79%
SRAH-08B090
VRAH-08B090
0.9V - 3.3V
5V
8A
26.4W
92%
SRAH-08B1A0
VVAH-08B1A0
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 1
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Absolute Maximum Ratings
Parameter
Max
Unit
-0.3
6
V
Vouten
-0.3
6
V
Ambient Temperature
Tamb
-40
85
°C
Storage Temperature
Tstor
-55
125
°C
Continuous Input Voltage
Output Enable Terminal Voltage
Symbol
Min
Vin
Typical
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
Module
Symbol
Min
All
Vin
4.5
Input Current
Typical
Max
Units
5.5
V
Iin
No Load Input Current
A
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
7.3
5.6
4.3
3.6
3.0
2.5
2.3
All
80
mA
9
15
mA
Remote Off Input Current
Input Reflected Ripple Current1
All
50
80
mArms
Input Reflected Ripple Current (P-P)1
All
150
200
mApk
I2t Inrush Current Transient
All
0.02
0.05
A2s
Turn On Voltage Threshold
All
4.3
4.5
V
Turn Off Voltage Threshold
All
3.8
4.49
V
4.19
Note: Input capacitance one 270µF/16V, ESR = 0.018 Ω max at 100kHz @ 25° C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Specifications
Parameter
Module
Min
Typical
Max
3.234
2.45
1.764
1.47
1.176
0.98
0.882
3.3
2.5
1.8
1.5
1.2
1.0
0.9
3.366
2.55
1.836
1.53
1.224
1.02
0.918
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
6
6
6
3
3
3
3
15
15
15
10
10
10
10
All
2
5
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
20
20
10
10
5
5
5
33
25
18
15
10
10
10
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
28
28
18
15
10
10
10
53
45
38
30
25
25
25
Output Ripple and Noise 2
All
50
100
mVp-p
Output Ripple and Noise 2
All
15
25
mVrms
Output Current Range
All
Iout
0
8
A
Output DC Current Limit
All
Ioutlim
10.4
20
A
Output Voltage Set Point 1
Symbol
Vout
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
V
mV
Load Regulation
Line Regulation
Regulation Over Temperature
(-40° to +85° C)
Units
mV
mV
mV
Total Output Voltage Regulation
Shor t Circuit Surge
A2s
Ioutsurge
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Turn on Time
All
Overshoot at Turn On
All
Output Capacitance
All
Ton
Cout
0
0.08
0.05
0.05
0.05
0.05
0.05
0.05
0.2
0.1
0.1
0.1
0.1
0.1
0.1
12
20
ms
0
3
%
3300
µF
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, 1µF ceramic cap and 10µF aluminum cap on output.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 3
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Specifications
Parameter
Module
Transient Response
Symbol
Min
Typical
Max
Units
130
165
mV
100
150
µs
130
165
mV
100
150
µs
130
165
mV
30
60
µs
120
165
mV
30
60
µs
120
165
mV
3
∆V 50% to 100% of Max Load
Settling Time
Ts
3.3V
∆V 100% to 50% of Max Load
Settling Time
Ts
Transient Response 3
∆V 50% to 100% of Max Load
Settling Time
Ts
2.5V
∆V 100% to 50% of Max Load
Settling Time
Ts
Transient Response
3
∆V 50% to 100% of Max Load
Settling Time
25
50
µs
120
165
mV
25
50
µs
100
150
mV
25
50
µs
100
150
mV
25
50
µs
90
125
mV
25
50
µs
90
125
mV
25
50
µs
70
110
mV
Ts
25
50
µs
70
110
mV
Ts
25
50
µs
70
110
mV
Ts
1.8V
∆V 100% to 50% of Max Load
Settling Time
Ts
Transient Response
3
∆V 50% to 100% of Max Load
Settling Time
Ts
1.5V
∆V 100% to 50% of Max Load
Settling Time
Ts
Transient Response
3
∆V 50% to 100% of Max Load
Settling Time
Ts
1.2V
∆V 100% to 50% of Max Load
Settling Time
Ts
Transient Response 3
∆V 50% to 100% of Max Load
Settling Time
1.0V
∆V 100% to 50% of Max Load
Settling Time
Transient Response 3
∆V 50% to 100% of Max Load
Settling Time
Ts
25
50
µs
70
110
mV
25
50
µs
0.9V
∆V 100% to 50% of Max Load
Settling Time
Ts
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
3. di/dt = 0.5A/µS, Ta = 25° C without external load capacitance; when Vout=3.3V or 2.5V a 220µF aluminum cap is added at
output.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
General Specifications
Parameter
Module
Symbol
Min
Typical
89
87
83
81
79
77
76
92
90
86
84
82
80
79
250
300
Max
Units
η
Efficiency1
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Switching Frequency
All
Output Voltage Trim Range2
(Wide Trim)
Fsw
1.8V
%
47.5
340
kHz
202
%
Output Voltage Trim Range2
(Narrow Trim)
%
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Weight
110
110
110
110
110
110
110
90
90
90
90
90
90
95
All
4.7
g
1. Vin=5V, full load and Ta=25° C.
2. See graphs on page 13 - 20.
Control Specifications
Parameter
Remote On/Off
1
Module
Symbol
All
Vouten
Min
Typical
1.35
All
-0.3
Vin = 5.5V
V
1.65
Vin = 4.5V
Signal High (Unit On)2
Units
V
Vin = 4.5V
Signal Low (Unit Off)2
Max
3.15
All
Vin = 5.5V
5.5
V
3.85
1. With remote on/off pin 1 open, the module is on.
2. Signal low and signal high varies based on Vin.
Note: On/off pin designed to work with an open collector/drain switch.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 5
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Efficiency Data
MODULE 2.5V
96%
95%
95%
94%
94%
93%
93%
4.5V
5.0V
92%
5.5V
91%
90%
EFFICIENCY
EFFICIENCY
MODULE 3.3V
92%
4.5V
91%
5.0V
90%
5.5V
89%
88%
89%
87%
88%
86%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
1.0
2.0
3.0
OUTPUT CURRENT
5.0
6.0
7.0
8.0
MODULE 1.5V
MODULE 1.8V
92%
93%
90%
4.5V
89%
5.0V
5.5V
87%
85%
EFFICIENCY
91%
EFFICIENCY
4.0
OUTPUT CURRENT
88%
4.5v
5.0v
86%
5.5v
84%
82%
83%
80%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
OUTPUT CURRENT
©2006 Bel Fuse Inc.
8.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
OUTPUT CURRENT
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 6
8.0
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Efficiency Data
MODULE 1.2V
90%
EFFICIENCY
88%
86%
4.5v
5.0v
84%
5.5v
82%
80%
78%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
MODULE 1.0V
88%
EFFICIENCY
86%
84%
4.5V
5.0V
82%
5.5V
80%
78%
76%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
MODULE 0.9V
88%
EFFICIENCY
86%
84%
4.5V
5.0V
82%
5.5V
80%
78%
76%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Ripple and Noise
1µF ceramic cap and 10µF aluminum electrolytic cap added at the output.
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,
1.8Vdc output and Ta=25° C
©2006 Bel Fuse Inc.
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,
1.5Vdc output and Ta=25° C
Specifications subject to change without notice. 02.06
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 / 0.9V – 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
Ripple and Noise
1µF ceramic cap and 10µF aluminum electrolytic cap added at the output.
Ripple and noise at full load and 5Vdc input,
1.2Vdc output and Ta=25° C
Ripple and noise at full load and 5Vdc input,
1.0Vdc output and Ta=25° C
Ripple and noise at full load and 5Vdc input,
0.9Vdc output and Ta=25° C
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Transient Response
Transient response: di/dt = 0.5A/µS, no external load capacitance.
Note: 3.3Vdc and 2.5Vdc output with external 220uF aluminum 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
Vout=1.8V
100% to 50% load transients at 5V input and Ta=25° C
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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 / 0.9V – 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
Transient Response
Transient response: di/dt = 0.5A/µS, 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
Vout=1.0V
50% to 100% load transients at 5V input and Ta=25° C
Vout=1.0V
100% to 50% load transients at 5V input and Ta=25° C
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Transient Response
Transient response: di/dt = 0.5A/µS, no external load capacitance
Vout=0.9V
50% to 100% load transients at 5V input and Ta=25° C
Vout=0.9V
100% to 50% load transients at 5V input and Ta=25° C
Thermal Considerations
SRAH-08B
©2006 Bel Fuse Inc.
VRAH-08B
Specifications subject to change without notice. 02.06
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
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Trim Up Test Circuit
Vo
Vo
Trim
Trim
Gnd
Gnd
xRAH-08B1A0 Trim Resistor Calculation
Rtrim −down
250.362
=(
− 261.1)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Ohm)
3000
2700
2400
2100
1800
1500
1200
900
600
300
0
0.85
0.94
1.04
1.14 1.23
1.33
1.42 1.52 1.61
A djus ted output voltage Vo,adj (V)
1.71
2
2.2
2.4
2.6
2.8
3
3.2
3.4
A djus ted output voltage Vo,adj(V)
3.6
1.8
Rtrim −up
199.2
=(
− 12.1)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
3000
2700
2400
2100
1800
1500
1200
900
600
300
0
1.8
©2006 Bel Fuse Inc.
3.8
Specifications subject to change without notice. 02.06
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
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
Rtrim −down
623.741
=(
− 651)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.305V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Ohm)
xRAH-08B330 Trim Resistor Calculation
1.55 .10
4
1.4 .10
4
1.25 .10
4
1.1 .10
4
9500
8000
6500
5000
3500
2000
500
Rtrim −up = (
199.2
− 402)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.305V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
1 .10
2.8
2.85
2.9
2.95
3
3.05 3.1 3.15 3.2
A djus ted output voltage Vo,adj (V)
3.25
3.3
3.3
3.35
3.4
3.45 3.5 3.55 3.6 3.65 3.7
A djus ted output voltage Vo,adj(V)
3.75
3.8
4
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B250 Trim Resistor Calculation
Rtrim −down
423.933
=(
− 760)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Ohm)
1.5 .10
4
4
1.35 .10
1.2 .10
4
4
1.05 .10
9000
7500
6000
4500
3000
1500
0
2.1
Rtrim −up
199.2
=(
− 511)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
1 .10
2.14
2.18
2.22 2.26
2.3 2.34 2.38 2.42
A djus ted output voltage Vo,adj (V)
2.46
2.5
2.54
2.58
2.62 2.66
2.7 2.74 2.78 2.82
A djus ted output voltage Vo,adj(V)
2.86
2.9
4
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
2.5
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 15
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
Rtrim −down
250.362
=(
− 760)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Ohm)
xRAH-08B180 Trim Resistor Calculation
1.5 .10
4
1.35 .10
4
1.2 .10
4
1.05 .10
4
9000
7500
6000
4500
3000
1500
0
1.5
1.53
1.56
1.59 1.62 1.65 1.68 1.71 1.74
A djus ted output voltage Vo,adj (V)
1.77
1.8
1.83
1.86
1.89 1.92 1.95 1.98 2.01 2.04
A djus ted output voltage Vo,adj(V)
2.07
2.1
4
Rtrim −up = (
199.2
− 511)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
1 .10
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
©2006 Bel Fuse Inc.
1.8
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 16
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B150 Trim Resistor Calculation
4
Rtrim−down = (
122.255
− 522)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Kohm)
1.5 .10
4
1.35 .10
4
1.2 .10
4
1.05 .10
9000
7500
6000
4500
3000
1500
0
1.35 1.37 1.38
1.4 1.41 1.43 1.44 1.46 1.47 1.49
Adjusted output voltage Vo,adj (V)
1.5
4
1.5 .10
Rtrim−up = (
139.2
− 348)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Kohm)
4
1.35 .10
4
1.2 .10
4
1.05 .10
9000
7500
6000
4500
3000
1500
0
1.5
1.51 1.53 1.54 1.56 1.58 1.59 1.61 1.62
Adjusted output voltage Vo,adj(V)
©2006 Bel Fuse Inc.
1.64 1.65
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 17
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B120 Trim Resistor Calculation
Rtrim −down = (
40.38
− 200)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.204V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Ohm)
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
1
1.02
1.04
1.06 1.08
1.1
1.12 1.14 1.16
A djus ted output voltage Vo,adj (V)
1.18
1.2
1.2
1.22
1.24
1.26
1.28
1.3
1.32 1.34
1.36
A djus ted output voltage Vo,adj(V)
1.38
1.4
4
Rtrim −up
80
=(
− 100)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.204V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
1 .10
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 18
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B100 Trim Resistor Calculation
Rtrim −down = (
Trim resistor value Rtrim_down(Ohm)
1000
10.544
− 63.2)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.006V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
900
800
700
600
500
400
300
200
100
0
0.85
0.86
0.88
0.9
0.91 0.93 0.94 0.95 0.97
A djus ted output voltage Vo,adj (V)
0.98
1
1.02
1.04
1.06 1.08
1.1
1.12 1.14 1.16
A djus ted output voltage Vo,adj(V)
1.18
1.2
4
Rtrim −up = (
40.88
− 12.1)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.006V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
1 .10
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
©2006 Bel Fuse Inc.
1
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 19
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B090 Trim Resistor Calculation
Rtrim −down
2.751
=(
− 38.2)ohm
Vo − Vo, adj
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.905V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Trim resistor value Rtrim_down(Ohm)
400
360
320
280
240
200
160
120
80
40
0
0.85
Rtrim −up = (
20.88
− 12.1)ohm
Vo, adj − Vo
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.905V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Trim resistor value,Rtrim_up(Ohm)
1 .10
0.855
0.86
0.865 0.87 0.875 0.88 0.885 0.89
A djus ted output voltage Vo,adj (V)
0.895
0.9
0.91
0.92
0.93 0.94 0.95 0.96 0.97 0.98
A djus ted output voltage Vo,adj(V)
0.99
1
4
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
0.9
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 20
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Mechanical
SRAH-08B
Suggested PCB Pad Layout
0.400
[10.16]
0.60
[15.24]
0.065 [1.65]
0.110
[2.79]
0.855
[21.72]
0.050
[1.27]
R0.015
[R0.38] typ
0.70
[17.78]
R0.008
[R0.20] typ
0.100 [2.54]
0.012
[0.30]
0˚-5˚
0.004 [0.10]
0.050
[1.27]
0.320
[8.13] 0.020
[0.51]
0.100
[2.54]
4x
0.400
[10.16]
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
Function
1
Remote On/Off
2
+Vin
3
Ground
4
+Vo
5
Trim
6
No Connection
7
No Connection
7
6
1 2 3 4 5
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 21
NON-ISOLATED DC/DC CONVERTERS
POWER PRODUCTS
5V Input / 0.9V – 3.3V Output / 8A
BP06xRAH-08B
Mechanical
0.700
[17.78]
VRAH-08B
0.050
[1.27]
0.600
[15.24]
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
Function
1
Remote On/Off
2
+Vin
3
Ground
4
+Vo
5
Trim
1 2 3 4 5
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 240ºC.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
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
page 22