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/1.5 A Output
Non-Isolated
High
Efficiency
Fixed Frequency (550 kHz)
Low
Profile
Package
Trim Function (Option)
Allows Burst Mode Operation at
Low Load Currents for xRAH-
02C500, Burst Mode Operation
Disabled for Lower Output Ripple
at Light Loads for xRAH-02C50B
UL60950
Recognized
(UL/cUL)
Description
The Bel xRAH-02C50x 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
87% at full load.
Part Selection
Output
Voltage
Input Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
5.0 Vdc
3.0 Vdc - 3.6 Vdc
1.5 A
7.5 W
87%
SRAH-02C50x
VRAH-02C50x
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. Replace "x" with "0" to allow burst mode operation at low load currents, or with "B" to disable burst
mode operation at light loads.
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
2.8 V
-
4.0 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
3.0 V
-
3.6 V
Input Current
-
-
3.3 A
Input Reflected Ripple Current
(rms)
-
30 mA
60 mA
Input Reflected Ripple Current
(pk-pk)
-
100 mA
150 mA
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 100 kHz
I
2
t Inrush Current Transient
-
0.02 A
2
s 0.05
A
2
s
Turn-on Voltage Threshold
-
2.8 V
2.9 V
xRAH-02C50x RoHS Compliant
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/1.5 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
4.825 V
5.0 V
5.175 V
Vin=3.3V, Io= full load
Load Regulation
-
25 mV
40 mV
Line Regulation
-
20 mV
30 mV
Regulation Over Temperature
(0
C to 70
C)
-
45 mV
80 mV
Output Current
0 A
-
1.5 A
Ripple and Noise (RMS)
-
15 mV
25 mV
Ripple and Noise (pk-pk)
-
50 mV
100 mV
Ripple and Noise (pk-pk) (No Load)
xRAH-02C500
xRAH-02C50B
-
-
50 mV
18 mV
-
-
0-20MHz BW, with1uF ceramic
capacitor at the output.
Overshoot at Turn on
-
0%
5%
Output Capacitance
0 uF
-
600 uF
Transient Response
50% ~ 100% Max Load
-
100 mV
150 mV
Settling Time
-
50 uS
100 uS
100% ~ 50% Max Load
-
100 mV
150 mV
Settling Time
V
O
=5 V
- 50
uS
100 uS
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.
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
84%
87%
-
Vin=3.3V, full load
Switching Frequency
500 kHz
550 kHz
650 kHz
Output Trim Range
95% V
O
- 110%
V
O
MTBF
14,455,458 hours
Calculated Per Bell Core SR-332
(Vin=3.3 V; Vo=5 V; I
O
= 1.2 A; T
a
=
25
C)
Dimensions (surface mount)
Inches (L
W
H)
Millimeters (L
W
H)
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
Dimensions (vertical)
Inches (L
W
H)
Millimeters (L
W
H)
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Weight -
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/1.5 A Output
Output Trim Equations
Equations for calculating the trim resistor 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.
Note: Output voltage Vo=5.004 V when Rtrim is open.
Efficiency Data
Efficiency Curve
82.0%
83.0%
84.0%
85.0%
86.0%
87.0%
88.0%
89.0%
0.150
0.375
0.750
1.125
1.500
Output Current (A)
E
ffi
c
i
e
n
c
y
3.0 V
3.3 V
3.6 V
xRAH-02C500
Efficiency Curve
78.0%
80.0%
82.0%
84.0%
86.0%
88.0%
90.0%
0.150
0.375
0.750
1.125
1.500
Output Current (A)
E
f
ficien
c
y
3.0 V
3.3 V
3.6 V
xRAH-02C50B
Vout
Trim
GND
Rtrim-down
Module
Vout
Trim
GND
Rtrim-up
Module
Kohm
adj
Vo
Vo
R
down
trim
)
5
.
12
,
144
.
44
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
2
,
4
.
8
(
_
-
-
=
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/1.5 A Output
Thermal Derating Curve
xRAH-02C50x
Ripple and Noise Waveforms
Ripple and noise at full load, Vin=3.3 V, Vo=5 V Ripple and noise at no load, Vin=3.3 V, Vo=5 V
Note: Ripple and noise tested with 1 uF ceramic capacitor at the output, 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/1.5 A Output
Transient Response Waveforms
50% to 100% load transient at Vin=3.3 V, Vo=5 V
100% to 50% load transient at Vin=3.3 V, Vo=5 V
Note:
Transient response at di/dt=0.5 A/uS, no external load capacitor, Ta=25 deg C.
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