NON-ISOLATED DC/DC CONVERTERS
3 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
xRAH-01CXx0 Series
•
•
•
•
Non-Isolated
High Efficiency
Fixed Frequency (550 kHz)
Low Profile Package
RoHS Compliant
•
•
•
Rev.A
Trim Function (option)
Allows Burst Mode Operation
at Low Load Currents
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-01CXx0 is part of the low cost non-isolated dc/dc converter series. The modules use a SMD or
SIP package or vertical package for ease of layout and space savings. The output is closely regulated and the
efficiency of 12 Vdc output module is typically 86% at full load. Typical features include allows burst mode
operation at low load currents and trim function (option).
Part Selection
Output
Voltage
12 V
15 V
Input
Voltage
3 V - 3.6 V
3 V - 3.6 V
Max. Output
Current
0.8 A
0.6 A
Max. Output
Power
9.6 W
9.0 W
Typical
Efficiency
86%
85%
Part Number
Surface Mount
SRAH-01CX20
SRAH-01CX50
Part Number
Vertical Mount
VRAH-01CX20
VRAH-01CX50
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
-40
°C
-40
°C
Typ
-
-
-
Max
4V
85
°C
125
°C
Notes
Input Specifications
Parameter
Input Voltage
Input Current (no load)
Input Current (full load)
V
O
=12V
V
O
=15V
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
2
Min
3V
-
-
-
-
-
-
-
Typ
-
15 mA
-
-
100 mA
30 mA
0.02 A s
2.8 V
2
Max
3.6 V
-
4.3 A
4A
150 mA
60 mA
0.05 A s
2.9 V
2
Notes
With simulated source impedance of
500 nH, 5 Hz to 20 MHz; Use 270
uF/16 V capacitor with ESR = 0.018
ohm max. at 100KHz at 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 CONVERTERS
3 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Output Specifications
Parameter
Output Voltage Set Point
V
O
=12 V
V
O
=15 V
Line Regulation
V
O
=12 V
V
O
=15 V
Load Regulation
V
O
=12 V
V
O
=15 V
Regulation Over Temperature
(-40
°C
to +85
°C)
V
O
=12 V
V
O
=15 V
Output Current
V
O
=12 V
V
O
=15 V
Ripple and Noise (rms)
V
O
=12 V; I
O
=0 A
V
O
=15 V; I
O
=0 A
V
O
=12 V; I
O
=0.8 A
V
O
=15 V; I
O
=0.6 A
Ripple and Noise (pk-pk)
V
O
=12V; I
O
=0A
V
O
=15V; I
O
=0A
V
O
=12V; I
O
=0.8A
V
O
=15V; I
O
=0.6A
Rise Time
Overshoot at Turn on
Output Capacitance
-
-
-
-
-
-
33 uF
85 mV
100 mV
60 mV
100 mV
5 mS
0%
-
120 mV
150 mV
100 mV
150 mV
-
5%
330 uF
The min output capacitance is
33 uF Tantalum capacitor at
the output
-
-
-
-
25 mV
25 mV
25 mV
35 mV
50 mV
50 mV
50 mV
60 mV
0A
0A
-
-
0.8 A
0.6 A
-
-
60 mV
75 mV
120 mV
150 mV
-
-
20 mV
20 mV
40 mV
40 mV
11.58 V
14.475 V
12 V
15 V
12.42 V
15.525 V
Min
Typ
Max
Notes
Test condition:
Vin=3.3V, lout=full load
-
-
45 mV
60 mV
80 mV
100 mV
Test conditions:
BW = 0-20 MHz; 1 uF Ceramic
capacitor and 33 uF Tantalum
capacitor at the output
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
All
Outputs
-
-
-
-
130 mV
100 uS
130 mV
100 uS
200 mV
200 uS
200 mV
200 uS
di/dt = 0.1 A/uS; Vin = 3.3 V;
and with 33 uF Tantalum
capacitor at the output
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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
General Specifications
Parameter
Efficiency
V
O
=12 V
V
O
=15 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
-
82%
81%
500 kHz
90% V
O
86%
85%
550 kHz
-
13,296,605 hours
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
-
-
-
650 kHz
110% V
O
Calculated Per Bell Core SR-332
(Vin=3.3 V; Vo=12 V; I
O
= 0.64 A;
T
a
= 25
°C)
Min
Typ
Max
Notes
Measured at Vin=3.3 V, full load
Note:
All specifications are typical at 25
°C
unless otherwise stated.
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
Rtrim-down
Module
Trim
R
trim
−
down
=
A
−
B
V
nom
−
V
adj
GND
R
trim
−
up
=
V
adj
C
−
D
−
V
nom
Vout
Module
Trim
Rtrim-up
GND
Vnom
12
15.055
A
164.640
209.542
B
21.850
20.600
C
11.760
11.760
D
7.150
5.900
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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Efficiency Data
Efficiency Curve
Efficiency Curve
88.0%
88.0%
87.0%
86.0%
85.0%
84.0%
83.0%
82.0%
81.0%
80.0%
79.0%
78.0%
0.08
86.0%
84.0%
Efficiency
3.0 V
3.3 V
3.6 V
82.0%
80.0%
78.0%
76.0%
74.0%
72.0%
70.0%
Efficiency
3.0 V
3.3 V
3.6 V
0.20
0.40
0.60
0.80
0.06
0.15
0.30
0.45
0.60
Output Current (A)
Output Current (A)
xRAH-01CX20
xRAH-01CX50
Thermal Derating Curves
xRAH-01CX20
xRAH-01CX50
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 Vdc - 3.6 Vdc Input
12 Vdc/0.8 A & 15 Vdc/0.6 A Output
Ripple and Noise Waveforms
3.3 Vdc input, 12 Vdc output
3.3 Vdc input, 15 Vdc output
Note:
Ripple and noise at full load, 1 uF ceramic cap and 33 uF tantalum cap at the output, and Ta=25 deg C.
Transient Response Waveforms
50% to 100% load transient at Vin=3.3 V, Vo=12 V
100% to 50% load transient at Vin=3.3 V, Vo=12 V
50% to 100% load transient at Vin=3.3 V, Vo=15 V
100% to 50% load transient at Vin=3.3 V, Vo=15 V
Note:
Transient response at di/dt=0.1 A/uS, with an external 33 uF tantalum load cap at the 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
