NON-ISOLATED DC/DC CONVERTER
5 V Input
Vref/2 / 5 A Output
xRAH-05BT50
•
•
•
•
Non-Isolated
Fixed frequency (300 kHz)
Under-voltage lockout (UVLO)
Current Sink Capability
RoHS Compliant
•
•
•
Remote On/Off
OCP/SCP
Low Profile Package (7.82 mm)
Description
The Bel xRAH-05BT50 is part of the low cost non-isolated dc/dc converter series. The converter is designed
specifically to provide bus termination voltage in application such as DDR (double data rate) memory where the
bus termination voltage must closely track the I/O bus voltage. The converter accepts a reference input and
programs its output voltage to 50% of the reference. The modules use a SMD or vertical mount package for
ease of layout and space savings.
Part Selection
Output
Voltage
Vref/2
Input
Voltage
5V
Max. Output
Current
5A
Max. Output
Power
6.25 W
Typical
Efficiency
82%
Part Number
Surface Mount
SRAH-05BT50
Part Number
Vertical Mount
VRAH-05BT50
Note:
Add “0” suffix at the end of the model number to indicate “Tube Packaging”, and “R” for “Reel
Packaging”, and “G” for “Tray Packaging”.
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 (Source)
Input Current (Sink)
Input Current (No load)
Remote Off Input Current
Input Reflected Ripple Current
(rms)
Input Reflected Ripple Current
(pk-pk)
2
I t Inrush Current Transient
Vref Voltage
Turn-on Voltage Threshold
Turn Off Voltage threshold
Min
4.5 V
-
-
-
-
-
-
0V
4.19 V
-
Typ
5.0 V
-
-
9 mA
30 mA
110 mA
0.02 A s
2.5 V
4.3 V
3.8 V
2
Max
5.5 V
2A
-1.5 A
60 mA
15 mA
50 mA
140 mA
0.05 A s
4V
4.5 V
4.49 V
2
Notes
Measured with simulated source
impedance of 500 nH, 5 Hz to 20 MHz;
& one 270 uF/16 V capacitor with ESR =
0.018 ohm max. at 100 kHz
Notes:
1. All tests are measured at Vref = 2.5 V.
2. All specifications are typical 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 CONVERTER
5 V Input
Vref/2 / 5 A Output
Output Specifications
Parameter
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current
Output Current Threshold
Short Circuit Surge Transient
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
Turn On Time
Overshoot at Turn on
Output Capacitance
Min
0.99* (Vref/2) V
-
-
-
0A
6.5 A
-
-
-
-
-
-
Typ
Vref/2
3 mV
1 mV
15 mV
-
-
2
0.04 A s
12 mV
45 mV
12 mS
0%
-
Max
1.01* (Vref/2) V
6 mV
3 mV
20 mV
5A
12.5 A
2
0.08 A s
20 mV
90 mV
20 mS
3%
2200 uF
Tested at:
0-20 MHz BW;
Notes
Vin=5 V, Iout=full load.
with 1 uF ceramic
capacitor at the output
Notes:
1. All specifications are typical at nominal input, full load at 25
°
C unless otherwise stated.
2. The modules track the transient response of the reference input. See the figure in TR data on Page 3.
3. The turn-off undershoot of the module is below 100mV if a 220 uF aluminum cap is added at the output.
4. All tests are measured at Vref=2.5 V.
General Specifications
Parameter
Efficiency (source)
Efficiency (sink)
Switching Frequency
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
Min
79%
78%
250 kHz
Typ
82%
81%
300 kHz
8,841,119 hours
0.78 x 0.7 x 0.32
19.812 x 17.78 x 8.128
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
4.7 g
Max
-
-
340 kHz
Calculated Per Bell Core SR-332 (I
O
=
4 A, Vin=5 V, Vref=2.5 V; T
a
= 25
°C)
Notes
Measured at Vin=5V, lo=lo-max full load
Measured at Vin=5V, lo=lo-max full load
-
-
Note:
All specifications are typical at nominal input, full load at 25
°
C unless otherwise stated. All tests are
measured at Vref=2.5 V.
Control Specifications
Parameter
Min
-0.3 V
-0.3 V
3.15 V(Vin=4.5V)
3.85 V(Vin=5.5V)
Typ
-
-
-
-
Max
1.35V (Vin=4.5V)
1.65V (Vin=5.5V)
5.5 V
5.5 V
Notes
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
Remote on/off pin open, unit on
Note:
All tests are measured at Vref=2.5 V.
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 CONVERTER
5 V Input
Vref/2 / 5 A Output
Transient Response
Track the transient response of the reference input. No External Load Capacitance.
Channel 1: Transient response
tracking.
Channel 2: Transient response
of the reference input.
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
NON-ISOLATED DC/DC CONVERTER
5 V Input
Vref/2 / 5 A Output
Efficiency Data
Efficiency Curve
87.0%
86.0%
85.0%
Efficiency
84.0%
83.0%
82.0%
81.0%
80.0%
79.0%
1.0
2.0
3.0
Output Current (A)
4.0
5.0
4.5 V
5.0 V
5.5 V
Efficiency is tested at Vref=2.5 V
Thermal Derating Curves
VRAH-05BT50
SRAH-05BT50
Test Condition:
Derating curves are tested at nominal input voltage and Vref=2.5V.
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 CONVERTER
5 V Input
Vref/2 / 5 A Output
Mechanical Outline
SRAH-05BT50
Pin Connections
Pin
1
Function
Remote On/Off (option)
Vin
Ground
Vout
Vref (option)
N/A
N/A
bel
2
3
4
5
6
7
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
