NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 3.6 Vdc Input
5.0 Vdc/3 A Output
xRAH-03C500
•
•
•
•
Non-Isolated
High Efficiency
RoHS Compliant
•
•
•
Rev.A
Allows Burst Mode Operation
at Low Load Currents
Trim Function (Option)
UL60950-1 Recognized (UL/cUL)
Fixed Frequency (530 kHz)
Low Profile Package
Description
The Bel xRAH-03C500 is a part of the low cost non-isolated dc/dc converter series. The modules use a SMD or
SIP package for ease of layout and space savings. The output is closely regulated and the efficiency is typically
90% at full load.
Part Selection
Output
Voltage
5.0 Vdc
Input Voltage
3.0 Vdc - 3.6 Vdc
Max. Output
Current
3A
Max. Output
Power
15 W
Typical
Efficiency
90%
Part Number
Surface Mount
SRAH-03C500
Part Number
Vertical Mount
VRAH-03C500
Notes:
1. Add “0” suffix at the end of the model number to indicate “Tube Packaging”, and “R” for “Reel
Packaging”, and “G” for “Tray Packaging”.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Ambient Temperature
Storage Temperature
Min
2.8 V
0
°C
-40
°C
Typ
-
-
-
Max
4.0 V
70
°C
125
°C
Notes
Input Specifications
Parameter
Input Voltage
Input Current
Input Reflected Ripple Current
(rms)
Input Reflected Ripple Current
(pk-pk)
I t Inrush Current Transient
Turn-on Voltage Threshold
2
Min
3.0 V
-
-
-
-
-
Typ
-
-
30 mA
100 mA
0.02 A s
2.8 V
2
Max
3.6 V
6.3 A
60 mA
150 mA
0.05 A s
2.9 V
2
Notes
With simulated source impedance of 500
nH, 5 Hz to 20 MHz; Use one 270 uF/16
V capacitor with ESR = 0.018 ohm max.
at 100KHz at 25
°C.
Note:
All specifications are typical at nominal input, full load 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 CONVERTERS
3.0 Vdc - 3.6 Vdc Input
5.0 Vdc/3 A Output
Output Specifications
Parameter
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(0
°C
to 70
°C)
Output Current
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
1
1
Min
4.875 V
-
-
-
0A
-
2
Typ
5.0 V
25 mV
20 mV
20 mV
-
15 mV
100 mV
70 mV
30 mS
0%
-
100 mV
50 uS
100 mV
50 uS
Max
5.125 V
50 mV
40 mV
30 mV
3A
25 mV
-
100 mV
50 mS
5%
1500 uF
150 mV
120 uS
150 mV
120 uS
Io = 0 A
Io = 3 A
Notes
Vin=3.3 V, Iout=full load
Burst Mode
Fixed Frequency
Rise Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=5 V
-
-
-
-
0 uF
-
-
-
-
di/dt = 0.5 A/uS; Vin = 3.3 V;
Ta = 25
°C
without external
capacitor
Notes:
All specifications are typical at nominal input, full load at 25
°
C unless otherwise stated.
1. Test condition of the output ripple and noise: 0-20 MHz BW.
2. Recommend a 220 uF capacitor at output if the module operates at burst mode (light load).
General Specifications
Parameter
Efficiency
V
O
=5.0 V
Switching Frequency
Output Trim Range
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
87%
460 kHz
90% V
O
90%
530 kHz
-
8,100,000 hours
-
630 kHz
110% V
O
Calculated Per Bell Core SR-332
(Vin=3.3 V; Vo=5 V; I
O
= 2.4 A; T
a
=
25
°C)
Min
Typ
Max
Notes
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
5.2 g
-
Note:
All specifications are typical at nominal input, full load 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 CONVERTERS
3.0 Vdc - 3.6 Vdc Input
5.0 Vdc/3 A Output
Output Trim Equations
Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output
voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the Trim
pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the
resistors should be used for any given application.
Vout
R
trim
−
down
12.033
=
(
−
7.8)
V
o
−
V
adj
Rtrim-down
Module
Trim
GND
Vout
R
trim
−
up
=
(
3.808
−
4.64)
V
adj
−
V
o
Module
Trim
Rtrim-up
GND
Note:
Output voltage Vo=5.0128 V when Rtrim is open.
Efficiency Data
Efficiency curve
93.0%
91.0%
89.0%
87.0%
85.0%
83.0%
81.0%
79.0%
77.0%
75.0%
0.30
0.75
1.50
2.25
Output Current (A)
3.00
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
Efficiency
3.0 V
3.3 V
3.6 V
NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 3.6 Vdc Input
5.0 Vdc/3 A Output
Thermal Derating Curve
xRAH-03C500
Ripple and Noise Waveform
Note:
Ripple and noise at full load, 3.3 Vdc input, 5 Vdc output and Ta=25 deg 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 CONVERTERS
3.0 Vdc - 3.6 Vdc Input
5.0 Vdc/3 A Output
Transient Response Waveforms
Transients 50% to 100% load, 3.3 Vdc Input ,5 Vdc Output,
Transients 100% to 50% load, 3.3 Vdc Input, 5 Vdc Output
Note:
Transient response at di/dt=0.5 A/uS, without external load capacitor, Ta=25 deg C.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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