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/7 A Output
Non-Isolated
Remote
On/Off
Fixed
Frequency
Input
Under
Voltage
Lockout
High
Efficiency
OCP/SCP
High
Power
Density
UL60950
Recognized
(UL/cUL)
Wide Range Trim
Low
Cost
Description
The Bel xRAH-07C1A0 module is a series of non-isolated, step down dc/dc power 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
(default output voltage is 1.8 Vdc). It is packaged in a compact, overmolder package rated at 7 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 is typically 92% 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
0.9 Vdc - 2.5 Vdc
3.3 Vdc
7 A
17.5 W
92%
SRAH-07C1A0
VRAH-07C1A0
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
3 V
-
3.6 V
Input Current (no load)
-
-
110 mA
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
=1.0 V
V
O
=0.9 V
-
-
-
-
-
-
-
-
-
-
-
-
6.6 A
5.3 A
4.6 A
3.8 A
3.2 A
3.0 A
Remote Off Input Current
-
7 mA
15 mA
Input Reflected Ripple Current (pk-pk)
-
150 mA
250 mA
Input Reflected Ripple Current (rms)
-
50 mA
80 mA
With simulated source impedance of 500
nH, 5 Hz to 20 MHz and a 270 uF/16 V with
ESR=0.03 ohm max. at 100 kHz
I
2
t Inrush Current Transient
-
0.08 A
2
s
0.16 A
2
s
Turn on Voltage Threshold
2.5 V
-
2.8 V
Turn off Voltage Threshold
-
2.4 V
-
xRAH-07C1A0 Series 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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
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
=1.0 V
V
O
=0.9 V
2.450 V
1.764 V
1.470 V
1.176 V
0.980 V
0.882 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
0.9 V
2.550 V
1.836 V
1.530 V
1.224 V
1.020 V
0.918 V
Test conditions:
Vin=3.3 V, Io= full load
Line Regulation
V
O
=1.5 V-2.5 V
V
O
=0.9 V-1.2 V
-
-
3 mV
1 mV
10 mV
5 mV
Load Regulation
V
O
=1.5 V-2.5 V
V
O
=0.9 V-1.2 V
-
-
3 mV
1 mV
10 mV
5 mV
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
=1.0 V
V
O
=0.9 V
-
-
-
-
-
-
25 mV
15 mV
15 mV
10 mV
8 mV
8 mV
40 mV
30 mV
30 mV
20 mV
15 mV
15 mV
Output Current
0
A - 7
A
Current Limit Threshold
8.4 A
-
17.5 A
Short Circuit Surge Transient
-
0.08 A
2
s 0.12
A
2
s
Ripple and Noise (rms)
V
O
=2.5 V-0.9 V
-
10 mV
20 mV
Ripple and Noise (pk-pk)
V
O
=2.5 V-1.2 V
V
O
=1.0 V-0.9 V
-
-
40 mV
40 mV
80 mV
70 mV
Test condition: 0-20 MHz BW,
with a 1 uF ceramic capacitor
and 10 uF aluminum capacitor
at the output.
Turn on Time
-
7 mS
15 mS
Overshoot at Turn on
-
0%
1%
Output Capacitance
0 uF
-
2200 uF
Transient Response
Overshoot -
120
mV
180 mV
50% ~ 100%
Max Load
Settling Time
-
40 uS
80 uS
Overshoot -
120
mV
180 mV
100% ~ 50%
Max Load
Settling Time
Vo=1.8 V-
2.5 V
- 40
uS
80
uS
Overshoot -
100
mV
150 mV
50% ~ 100%
Max Load
Settling Time
-
40 uS
80 uS
Overshoot -
100
mV
150 mV
100% ~ 50%
Max Load
Settling Time
Vo=1.5 V
- 40
uS
80
uS
Overshoot -
50
mV
100 mV
50% ~ 100%
Max Load
Settling Time
-
40 uS
80 uS
Overshoot -
50
mV
100 mV
100% ~ 50%
Max Load
Settling Time
Vo=0.9 V-
1.2 V
- 40
uS
80
uS
Test conditions:
di/dt = 0.5 A/uS; Vin = 3.3 V;
without any external 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/7 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=1.0 V
V
O
=0.9 V
90%
86%
84%
81%
79%
78%
92%
88%
86%
83%
81%
80%
-
-
-
-
-
-
Measured at Vin=3.3 V, full load and
Ta=25
C
Switching Frequency
250 kHz
300 kHz
340 kHz
Output Trim Range
50%
-
146%
V
O
=1.8 V
MTBF
3,391,747 hours
Calculated Per Bell Core SR-332
(Vin=3.3 V; Vo=1.8 V; I
O
= 5.6 A; 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
-
1 V
Signal High (Unit On)
1.8 V
-
3.6 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 (Vnom) are shown below. The Trimup resistor should be connected between the Trim
pin and Ground and the Trimdown resistor should be connected between the Trim pin and Vout pin.
Note: Output voltage Vo=1.8 V when R
trim
is open.
Module
Vout
Trim
GND
Rtrimup
Kohm
Vo
adj
Vo
up
Rtrim
)
261
.
0
,
064
.
3
(
_
-
-
=
Module
Vout
Trim
GND
Rtrimdown
Kohm
adj
Vo
Vo
R
down
trim
)
091
.
4
,
8488
.
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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Efficiency Data
MODULE 2.5V
60.0%
70.0%
80.0%
90.0%
100.0%
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
EFF
I
CI
EN
CY
3
3.3
3.6
MODULE 1.8V
60.0%
70.0%
80.0%
90.0%
100.0%
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
E
F
F
I
CI
ENCY
3
3.3
3.6
MODULE 1.5V
55.0%
65.0%
75.0%
85.0%
95.0%
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
EFF
I
C
I
EN
C
Y
3
3.3
3.6
MODULE 1.2V
50.0%
60.0%
70.0%
80.0%
90.0%
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
EF
FI
C
I
E
N
C
Y
3
3.3
3.6
MODULE 1.0V
50.0%
60.0%
70.0%
80.0%
90.0%
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
E
F
F
I
CI
EN
CY
3
3.3
3.6
MODULE 0.9V
55.0%
65.0%
75.0%
85.0%
95.0%
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
EF
F
I
CI
E
N
CY
3
3.3
3.6
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/7 A Output
Thermal Derating Curves
VRAH-07C1A0 SRAH-07C1A0
Ripple and Noise Waveforms
Note: Ripple and noise at full load, 3.3 Vdc input, 1.8 Vdc output and Ta=25 deg C,
with 1 uF ceramic capacitor
and 10 uF aluminum capacitor at the output.
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