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Электронный компонент: XRAH-03F1A0

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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 - 5.5 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A Output

Non-Isolated
Remote
On/Off
High
Efficiency
Input Under Voltage Lockout
Fixed Frequency (300 kHz)
OCP/SCP
Low
Cost
UL60950
Recognized
(UL/cUL)
Wide
Range
Trim
Description
The Bel xRAH-03F1A0 module is a non-isolated, step down dc/dc converter that operates from 3.0 Vdc to 5.5
Vdc source. This converter is available in a range of output voltages from 0.9 Vdc to 3.3 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 efficiency of 3.3 Vdc module is typically 92% at 5
Vdc input and full load. Typical features include remote on/off, input under voltage lockout, over current
protection and short circuit protection.
Part Selection
Output Voltage
Input Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
0.9 Vdc - 3.3 Vdc
3.0 Vdc - 5.5 Vdc
3 A
10 W
92%
SRAH-03F1A0
VRAH-03F1A0
Note: Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "R" for "Reel Packaging",
and "G" for "Tray Packaging".
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3 V
-
6 V
Output Enable Terminal Voltage
-0.3 V
-
6 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
V
O
=3.3 V
V
O
=2.5 V
V
O
=0.9 V-1.8 V
4.5 V
3.6 V
3.0 V
-
-
-
5.5 V
5.5 V
5.5 V
Input Current (no load)
-
-
70 mA
Input Current (full load)
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
Vo=0.9 V
-
-
-
-
-
-
-
-
-
-
-
-
2.5 A
2.4 A
2.2 A
1.9 A
1.6 A
1.3 A
Remote Off Input Current
-
5 mA
10 mA
Input Reflected Ripple Current (pk-pk)
-
75 mA
-
Input Reflected Ripple Current (rms)
-
25 mA
-
Tested with simulated source impedance
of 500 nH, 5 Hz to 20 MHz and two 270
uF/16 V Oscon caps with ESR=0.018 ohm
max at 100 kHz
xRAH-03F1A0 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 - 5.5 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
I
2
t Inrush Current Transient
-
0.004 A
2
s
0.008 A
2
s
Turn on Voltage Threshold
-
-
2.9 V
Turn off Voltage Threshold
2.2 V
2.4 V
-
Only for 0.9 V-1.8 V output modules.
Note: All specifications are typical at nominal input (5 V), full load at 25
C
unless otherwise stated.

Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
V
O
=3.3 V
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
3.217 V
2.437 V
1.755 V
1.462 V
1.170 V
0.877 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
3.383 V
2.563 V
1.845 V
1.538 V
1.230 V
0.923 V
Test conditions:
Vin=5 V, Io=50% full
load
Line Regulation
V
O
=3.3 V
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
-
-
-
-
-
-
10 mV
8 mV
6 mV
5 mV
4 mV
3 mV
20 mV
16 mV
12 mV
10 mV
8 mV
6 mV
Load Regulation
V
O
=3.3 V
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
-
-
-
-
-
-
17 mV
13 mV
9 mV
8mV
6 mV
5 mV
33 mV
25 mV
18 mV
15 mV
12 mV
9 mV
Regulation Over Temperature(-40
C to +85
C)
V
O
=3.3 V
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
-
-
-
-
-
-
72 mV
54 mV
39 mV
32 mV
26 mV
19 mV
97 mV
72 mV
52 mV
43 mV
40 mV
40 mV
Output Current
0 A
-
3 A
Current Limit Threshold
5 A
-
12 A
Short Circuit Surge Transient
-
0.022 A
2
s 0.044
A
2
s
Ripple and Noise (rms)
V
O
=1.2 V-3.3 V
V
O
=0.9 V
-
-
15 mV
10 mV
25 mV
20 mV
Ripple and Noise (pk-pk)
V
O
=1.2 V-3.3 V
V
O
=0.9 V
-
-
50 mV
40 mV
70 mV
60 mV
Test condition: 0-20 MHz
BW
Turn on Time
-
7 mS
12 mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
0 uF
-
1200 uF
Transient Response
Overshoot
-
150 mV
200 mV
50% ~ 100%
Max Load
Settling Time
-
20 uS
40 uS
Overshoot
-
150 mV
200 mV
100% ~ 50%
Max Load
Settling Time
All
-
20 uS
40 uS
Test conditions:
di/dt = 0.5 A/uS; Vin =
5 V
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 - 5.5 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A Output

General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
Vo=0.9 V
88%
86%
83%
80%
77%
75%
92%
90%
87%
84%
81%
79%
-
-
-
-
-
-
Measured at Vin=5 V, full load and
Ta=25
C
Switching Frequency
250 kHz
300 kHz
360 kHz
Output Trim Range (wide trim)
100%Vo
-
403%Vo
Vo=0.9 V
MTBF
9,159,999 hours
Calculated Per Bell Core SR-332 (Vin=
5 V; Vo=3.3 V; I
O
= 80% load; T
a
= 25
C)
Dimensions (surface mount)
Inches (L
W
H)
Millimeters (L
W
H)
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.13
Dimensions (vertical)
Inches (L
W
H)
Millimeters (L
W
H)
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Weight -
5
g
-

Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3 V
-
0.8 V
Signal High (Unit On)
2.8 V
-
6 V
Remote on/off pin open, unit on.


Output Trim Equations
Equations for calculating the trim resistor given the desired adjusted voltage (Vadj) and the nominal output
voltage of the converter (Vo) are shown below. 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=0.902V when Ttrim-up is not connected.
Vout
Trim
GND
Rtrim-up
Module
Kohm
Vo
up
Vadj
up
Rtrim


-
-
=
1
_
712
.
3
_
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 - 5.5 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A Output
Efficiency Data
Efficiency Curve
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.30
0.75
1.50
2.25
3.00
Output Current (A)
Ef
f
i
c
i
e
n
c
y
4.5 V
5.0 V
5.5 V
Efficiency Curve
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.30
0.75
1.50
2.25
3.00
Output Current (A)
E
f
f
i
ci
en
c
y
3.6 V
5.0 V
5.5 V
Vo=3.3 V Vo=2.5 V
Efficiency Curve
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.30
0.75
1.50
2.25
3.00
Output Current (A)
E
f
f
i
ci
enc
y
3.0 V
3.3 V
5.0 V
5.5 V
Efficiency Curve
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.30
0.75
1.50
2.25
3.00
Output Current (A)
E
f
f
i
ci
enc
y
3.0 V
3.3 V
5.0 V
5.5 V
Vo=1.8 V Vo=1.5 V
Efficiency Curve
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.30
0.75
1.50
2.25
3.00
Output Current (A)
E
ffic
i
e
n
c
y
3.0 V
3.3 V
5.0 V
5.5 V
Efficiency Curve
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
0.30
0.75
1.50
2.25
3.00
Output Current (A)
E
f
f
i
ci
enc
y
3.0 V
3.3 V
5.0 V
5.5 V
Vo=1.2 V Vo=0.9 V

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 - 5.5 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A Output
Thermal Derating Curve














xRAH-03F1A0



Ripple and Noise Waveforms



















Vo=0.9 V Vo=1.2 V