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
12 V Input
0.9 V-3.3 V/7 A Output
Non-Isolated
Remote
On/Off
Fixed
Frequency
Input Under Voltage Lockout
High
Efficiency
OCP/SCP
High
Power
Density
Wide Range Trim
Low
Cost
Description
The Bel x7AH-07A1A0 modules are a series of non-isolated, step down dc/dc converters that operate from a
nominal 12 V source. These converters are available in a range of output voltages from 0.9 V to 3.3 V. It is
packaged in a compact, overmolded 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 88% for 3.3 V output at 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 V -3.3 V
12 V
7 A
23.1 W
88%
S7AH-07A1A0
V7AH-07A1A0
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
-
15 V
Output Enable Terminal Voltage
-0.3 V
-
14 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input
Voltage
10
V - 14
V
Input Current (no load)
-
-
100 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
V
O
=0.9 V
-
-
-
-
-
-
-
-
-
-
-
-
3.0 A
2.6 A
1.9 A
1.6 A
1.3 A
1.0 A
Remote Off Input Current
-
3 mA
10 mA
x7AH-07A1A0 Series
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
12 V Input
0.9 V-3.3 V/7 A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (pk-pk)
-
180 mA
-
Input Reflected Ripple Current (rms)
-
50 mA
-
Tested with simulated source impedance of
500 nH, 5 Hz to 20 MHz and two 270 uF/16 V
Oscon capacitors with ESR=0.018 ohm max.
at 100 kHz
I
2
t Inrush Current Transient
-
0.01 A
2
s
0.02 A
2
s
Turn on Voltage Threshold
-
9.5 V
-
Turn off Voltage Threshold
-
9.0 V
9.5 V
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
3.247 V
2.460 V
1.771 V
1.476 V
1.181 V
0.886 V
3.3 V
2.5 V
1.8V
1.5 V
1.2 V
0.9 V
3.353 V
2.540 V
1.829 V
1.524 V
1.219 V
0.914 V
Test conditions:
Vin=12 V, Io=50% full load
Line Regulation
-
3mV
6mV
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
-
-
-
-
-
-
5 mV
5 mV
5 mV
3 mV
3 mV
3 mV
10 mV
10 mV
10 mV
6 mV
6 mV
6 mV
Regulation Over Temperature
(-40
C to +85 C)
-
30 mV
50 mV
Output Current
0
A - 7
A
Current Limit Threshold
10
A - 20
A
Short Circuit Surge Transient
-
0.02 A
2
s 0.04
A
2
s
Ripple and Noise (rms)
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
-
-
-
-
-
-
20 mV
20 mV
15 mV
15 mV
15 mV
10 mV
50 mV
50 mV
40 mV
40 mV
30 mV
30 mV
Ripple and Noise (pk-pk)
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
-
-
-
-
-
-
70 mV
70 mV
60 mV
60 mV
60 mV
50 mV
100 mV
100 mV
100 mV
80 mV
80 mV
70 mV
Test condition: 0-20 MHz BW,
with a 330 uF/10 V Tantalum
capacitor at the output.
Turn on Time
-
8 mS
20 mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
330 uF
-
2800 uF
Transient Response
Overshoot -
120
mV
180 mV
50% ~ 100%
Max Load
Settling Time
-
50 uS
80 uS
Overshoot -
120
mV
180 mV
100% ~ 50%
Max Load
Settling Time
All
- 50
uS
80
uS
Test conditions:
di/dt = 0.5 A/uS; Vin = 12 V;
with a 330 uF/10 V 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
12 V Input
0.9 V-3.3 V/7 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
V
O
=0.9 V
85%
83%
80%
78%
75%
71%
88%
86%
83%
81%
78%
74%
-
-
-
-
-
-
Measured at Vin=12 V, full load and
Ta=25
C
Switching Frequency
250 kHz
300 kHz
350 kHz
Output Trim Range (wide trim)
-
-
403% Vo
V
O
=0.9 V
Output Trim Range (narrow trim)
V
O
=1.2 V-3.3 V
V
O
=0.9 V
90% Vo
-
-
-
110% Vo
110% Vo
MTBF
8,202,646 hours
Calculated Per Bell Core TR-332
(Vin=12 V; Vo=3.3 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)
3.5 V
-
14 V
Remote on/off pin open, unit on.
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vnom) are shown below. The Trim Up resistor should be connected between
the Trim pin and Ground.
05
.
1
06
.
6
-
-
=
nom
adj
trimup
V
V
R
Note: Output voltage Vo=0.9 V when R
trimup
is not connected.
Module
Vout
Trim
GND
Rtrimup
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
12 V Input
0.9 V-3.3 V/7 A Output
Efficiency Data
MODULE 3.3 V
60.0%
70.0%
80.0%
90.0%
100.0%
0.7
1.75
3.5
5.25
7
OUTPUT CURRENT (A)
EFFI
C
I
EN
C
Y
10.0 V
12.0 V
14.0 V
MODULE 1.8 V
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
0.7
1.75
3.5
5.25
7
OUTPUT CURRENT (A)
E
F
F
I
CI
E
N
CY
10.0 V
12.0 V
14.0 V
MODULE 0.9 V
60.0%
65.0%
70.0%
75.0%
80.0%
0.70
1.75
3.50
5.25
7.00
OUTPUT CURRENT (A)
E
FFI
C
I
EN
C
Y
10.0 V
12.0 V
14.0 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
12 V Input
0.9 V-3.3 V/7 A Output
Thermal Derating Curves
Vo=0.9 V-2.5 V
Vo=3.3 V
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