NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 3.6 Vdc Input
5.0 Vdc/1.5 A Output
xRAH-02C50x
•
•
•
•
•
Non-Isolated
High Efficiency
RoHS Compliant
•
Rev.A
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
UL60950-1 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
5.0 Vdc
Input Voltage
3.0 Vdc - 3.6 Vdc
Max. Output
Current
1.5 A
Max. Output
Power
7.5 W
Typical
Efficiency
87%
Part Number
Surface Mount
SRAH-02C50x
Part Number
Vertical Mount
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.
3. 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
-40
°C
-40
°C
Typ
-
-
-
Max
4.0 V
85
°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
3.3 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 100 kHz
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
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)
Ripple and Noise (pk-pk) (No Load)
xRAH-02C500
xRAH-02C50B
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=5 V
-
-
-
-
100 mV
50 uS
100 mV
50 uS
150 mV
100 uS
150 mV
100 uS
di/dt = 0.5 A/uS; Vin = 3.3 V;
Ta = 25
°C
without external
capacitor
Min
4.825 V
-
-
-
0A
-
-
Typ
5.0 V
25 mV
20 mV
45 mV
-
15 mV
50 mV
Max
5.175 V
40 mV
30 mV
80 mV
1.5 A
25 mV
100 mV
0-20MHz BW, with1uF ceramic
capacitor at the output.
Notes
Vin=3.3V, Io= full load
-
-
-
0 uF
50 mV
18 mV
0%
-
-
-
5%
600 uF
Notes:
All specifications are typical at nominal input, full load at 25
°
C unless otherwise stated.
General Specifications
Parameter
Efficiency
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
-
Min
84%
500 kHz
95% V
O
Typ
87%
550 kHz
-
14,455,458 hours
Max
-
650 kHz
110% V
O
Calculated Per Bell Core SR-332
(Vin=3.3 V; Vo=5 V; I
O
= 1.2 A; T
a
=
25
°C)
Notes
Vin=3.3V, full load
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/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.
Vout
R
trim
_
down
=
(
44.144
−
12.5)
Kohm
Vo
−
Vo
,
adj
Rtrim-down
Module
Trim
GND
Rtrim
_
up
=
(
8.4
−
2)
Kohm
Vo
,
adj
−
Vo
Module
Vout
Trim
Rtrim-up
GND
Note:
Output voltage Vo=5.004 V when Rtrim is open.
Efficiency Data
Efficiency Curve
89.0%
88.0%
Efficiency
87.0%
86.0%
85.0%
84.0%
83.0%
82.0%
0.150
0.375
0.750
1.125
1.500
3.0 V
3.3 V
3.6 V
Output Current (A)
xRAH-02C500
Efficiency Curve
90.0%
88.0%
Efficiency
86.0%
84.0%
82.0%
80.0%
78.0%
0.150
0.375
0.750
1.125
1.500
Output Current (A)
3.0 V
3.3 V
3.6 V
xRAH-02C50B
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.
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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