NON-ISOLATED DC/DC CONVERTERS
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
xRAH-03C Series
•
•
•
•
•
Non-Isolated
High Efficiency
Low Cost
RoHS Compliant
•
•
•
•
•
OCP/SCP
Rev.A
Wide Range Trim
Remote On/Off
Industrial Temperature Range
UL60950-1 Recognized (UL/cUL)
Excellent Thermal Performance
Input Under Voltage Lockout
Description
The Bel xRAH-03C1A0 modules are a series of non-isolated, step down dc/dc converters that operate from a
nominal 3.3 Vdc source. These converters are available in a range of output voltages from 0.9 Vdc to 2.5 Vdc. It
is packaged in a compact, overmolded package rated at 3 A. Optional lead forming provides a vertical mount
product for minimal footprint or a surface mount option for a very low profile. The output is closely regulated and
the efficiency for 2.5 Vdc output is typically 93% at full load. Typical features include remote on/off, input under
voltage lockout, over current protection and short circuit protection.
Part Selection
Output Voltage
0.9 Vdc - 2.5 Vdc
2.5 Vdc
1.8 Vdc
1.5 Vdc
1.2 Vdc
0.9 Vdc
Input
Voltage
3.3 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
Max. Output
Current
3A
3A
3A
3A
3A
3A
Max. Output
Power
7.5 W
7.5 W
5.4 W
4.5 W
3.6 W
2.7 W
Typical
Efficiency
93%
93%
89%
87%
84%
81%
Part Number
Surface Mount
SRAH-03C1A0
SRAH-03C250
SRAH-03C180
SRAH-03C150
SRAH-03C120
SRAH-03C090
Part Number
Vertical Mount
VRAH-03C1A0
VRAH-03C250
VRAH-03C180
VRAH-03C150
VRAH-03C120
VRAH-03C090
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)
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 (no load)
Input Current (full load)
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Remote Off Input Current
-
-
-
-
-
-
-
-
-
-
-
7 mA
3.1 A
2.3 A
1.9 A
1.6 A
1.2 A
14 mA
Min
3V
-
Typ
-
-
Max
3.6 V
110mA
Notes
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Input Specifications (continued)
Parameter
Input Reflected Ripple Current (pk-pk)
Min
-
Typ
50 mA
Max
100 mA
Notes
With simulated source impedance
of 500 nH, 5 Hz to 20 MHz; use a
270 uF/6.3 V capacitor with
ESR=0.03 ohm max, at 100 kHz.
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn on Voltage Threshold
Turn off Voltage Threshold
2
-
-
-
-
15 mA
0.01 A s
2.7 V
2.4 V
2
25 mA
0.02 A s
-
-
2
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Line Regulation
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Load Regulation
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Regulation Over Temperature
(-40
°C
to +85
°C)
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Output Current
Current Limit Threshold
Short Circuit Surge Transient
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
-
-
-
-
-
-
-
-
-
-
1 mV
1 mV
1 mV
1 mV
1 mV
5 mV
5 mV
5 mV
5 mV
5 mV
-
-
-
-
-
1 mV
1 mV
1 mV
1 mV
1 mV
5 mV
5 mV
5 mV
5 mV
5 mV
2.450 V
1.764 V
1.470 V
1.176 V
0.882 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
2.550 V
1.836 V
1.530 V
1.224 V
0.918 V
Test conditions:
Vin=3.3 V, Io= full load
Min
Typ
Max
Notes
-
-
-
-
-
0A
5A
10 mV
10 mV
10 mV
10 mV
10 mV
-
-
0.04 A s
2
0.04 A s
2
0.04 A s
2
0.04 A s
2
0.04 A s
2
20 mV
20 mV
20 mV
20 mV
20 mV
3A
9A
0.08 A s
2
0.08 A s
2
0.08 A s
2
0.08 A s
2
0.08 A s
2
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Output Specifications (continued)
Parameter
Ripple and Noise (rms)
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Ripple and Noise (pk-pk)
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
V
O
=0.9 V
V
O
=1.2 V
V
O
=1.5 V
V
O
=1.8 V
V
O
=2.5 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
100 mV
30 uS
100 mV
30 uS
100 mV
30 uS
100 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
130 mV
60 uS
130 mV
60 uS
130 mV
60 uS
130 mV
60 uS
120 mV
60 uS
120 mV
60 uS
120 mV
60 uS
120 mV
60 uS
120 mV
60 uS
120 mV
60 uS
Test conditions:
di/dt=0.5 A/us, Vin=3.3 V,
without any external
capacitor at the output.
-
-
-
-
-
-
-
0 uF
45 mV
45 mV
45 mV
45 mV
45 mV
7 mS
0%
-
70 mV
70 mV
70 mV
70 mV
70 mV
15 mS
1%
1200 uF
-
-
-
-
-
10 mV
10 mV
10 mV
10 mV
10 mV
20 mV
20 mV
20 mV
20 mV
20 mV
Min
Typ
Max
Notes
Test conditions:
0-20 MHz BW; 0.1 uF ceramic
capacitor and
10 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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
General Specifications
Parameter
Efficiency
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Switching Frequency
Output Trim Range (wide trim)
Output Trim Range (narrow trim)
Vo=1.2 V - 2.5 V
Vo=0.9 V
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
90%
86%
84%
81%
78%
250 kHz
0
90%Vo
-
93%
89%
87%
84%
81%
300 kHz
-
-
-
3,131,719 hours
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.13
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
5g
-
-
-
-
-
-
340 kHz
292%V
O
110%Vo
110%Vo
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
°C)
Vo=0.9 V
Measured at Vin=3.3 V, full load and
Ta=25
°C
Min
Typ
Max
Notes
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
-0.3 V
1.8 V
-
-
0.3 V
3.6 V
Min
Typ
Max
Notes
Remote on/off pin open, unit on.
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
3.3 Vdc Input
0.9 Vdc - 2.5 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
A
−
B
R
trimdown
=
V
nom
−
V
adj
Rtrimdown
Module
Trim
GND
C
R
trimup
=
−
D
V
adj
−
V
nom
Vout
Module
Trim
Rtrimup
GND
Vnom
0.9 - 2.5
2.5
1.8
1.5
1.2
0.9
A
N/A
7.9117
4.6538
3.2633
1.8699
N/A
B
N/A
16.14
20.84
16.14
11.45
N/A
C
3.712
3.712
3.712
3.712
3.712
3.712
D
1.54
11.5
16.2
11.5
6.81
33.2
Notes
Vo=0.9 V when Rtrim is open
Vo=2.505 V when Rtrim is open
Vo=1.803 V when Rtrim is open
Vo=1.503 V when Rtrim is open
Vo=1.203 V when Rtrim is open
Vo=0.903 V when Rtrim is open
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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