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
4.5V-14V Input
0.8V-5.5V/8A Output
Non-Isolated
Remote
On/Off
Fixed
Frequency
Under-voltage Lockout (UVLO)
High
Efficiency
OCP/SCP
High Power Density
Wide Trim Range
Low
Cost
Description
The Bel x7AH-08E1A0 modules are a series of non-isolated, step down DC/DC converters that operate from
4.5V to14V source. These converters are available in a range of output voltages from 0.8V to 5.5V. It is
packaged in a compact, overmolded package rated at 8A. 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 5V output is typically 93% 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
0.8V - 3.63V
4.5V 14V
8A
26.4W 91%
S7AH-08E1A0
V7AH-08E1A0
4.5V 5.5V
8V 14V
8A
44W 93%
S7AH-08E500
V7AH-08E500
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)
-0.3V
-
15V
Output Enable Terminal Voltage
-0.3V
-
14V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
Vo=4.5V-5.5V
Vo=0.9V-3.63V
8.0V
4.5V
-
-
14V
14V
Input Current (full load)
Vo=5.0V
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5.4A
6.7A
5.3A
3.2A
3.0A
2.8A
2.0A
Input Current (no load)
-
-
100mA
Remote Off Input Current
-
3mA
10mA
Input Reflected Ripple Current (pk-pk)
-
180mA
-
Input Reflected Ripple Current (RMS)
-
50mA
-
With simulated source impedance of 500nH, 5Hz
to 20MHz; use two 47uF/16V low ESR Tantalum
capacitors.
x7AH-08E Series PRELIMINARY
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
4.5V-14V Input
0.8V-5.5V/8A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
I
2
t Inrush Current Transient
-
0.04A
2
s -
- 4.3V -
x7AH-08E1A0
Turn-on Voltage Threshold
- 7.5V -
x7AH-08E500
- 4.0V -
x7AH-08E1A0
Turn-off Voltage Threshold
- 7.2V -
x7AH-08E500
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
Vo=5.0V
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
4.900V
3.234V
2.450V
1.764V
1.470V
1.176V
0.882V
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
5.100V
3.366V
2.550V
1.836V
1.530V
1.224V
0.918V
Test condition:
Vin=12V, lout=50% full
load
Line Regulation
Vo=5.0V
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
-
-
-
-
-
-
-
15mV
10mV
8mV
5mV
5mV
4mV
4mV
25mV
16.5mV
12.6mV
9mV
9mV
8mV
8mV
Load Regulation
Vo=5.0V
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
-
-
-
-
-
-
-
15mV
10mV
8mV
5mV
5mV
4mV
4mV
25mV
16.5mV
12.5mV
9mV
9mV
8mV
8mV
Regulation Over Temperature
(-40
C to 85C)
- 30mV
50mV
Output Current
0A - 8A
Current Limit Threshold
10A - 20A
Short Circuit Surge Transient
-
TBD
-
Ripple and Noise (RMS)
-
15mV
30mV
Ripple and Noise (pk-pk)
-
50mV
80mV
BW = 0-20MHz; with a 1uf
ceramic capacitor and a
10uF/10V Tantalum
capacitor at the output.
Turn on Time
-
8mS
20mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
0uF
-
3200uF
Transient Response
Overshoot -
120mV
180mV
50% ~ 100%
Max Load
Settling Time
-
50uS
80uS
Overshoot -
120mV
180mV
100% ~ 50%
Max Load
Settling Time
All
- 50uS
80uS
di/dt = 0.5A/uS; Vin =
12V; with a 1uF ceramic
capacitor and a 10uF/10V
Tantalum capacitor at the
output.
Note:
All specifications are typical at 12V 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
4.5V-14V Input
0.8V-5.5V/8A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=5.0V
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
89%
87%
86%
84%
82%
81%
76%
93%
91%
90%
88%
86%
85%
80%
-
-
-
-
-
-
-
Measured at Vin=12V, full load
Switching Frequency
-
330KHz
-
90%V
O
- 403%V
O
x7AH-08E1A0
1
Output Trim Range
90%V
O
- 110%V
O
x7AH-08E500
2
Remote Sense Compensation - - 0.2V
MTBF
TBD
Calculated Per Bell Core TR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions (surface mount)
Inches (L W H)
Millimeters (L W H)
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
Dimensions (vertical)
Inches (L W H)
Millimeters (L W H)
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Weight -
6g
-
Notes
: All specifications are typical at 25
C
unless otherwise stated.
1. The output voltage is 0.9V at trim pin is open.
2. The output voltage is 5.0V at trim pin is open.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3V
-
0.8V
Signal High (Unit On)
2.4V
-
14V
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
4.5V-14V Input
0.8V-5.5V/8A Output
Output Trim Equations
1) x7AH-08E1A0
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 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.
631
.
5
076
.
1
-
-
=
-
adj
o
down
trim
V
V
R
261
.
0
759
.
3
-
-
=
-
o
adj
up
trim
V
V
R
Note:
Output voltage Vo=0.9V when Rtrim_up is not connected.
2) x7AH-08E500
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 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.
631
.
5
099
.
23
-
-
=
-
adj
o
down
trim
V
V
R
261
.
0
759
.
3
-
-
=
-
o
adj
up
trim
V
V
R
Note:
Output voltage Vo=5V when Rtrim_up is not connected.
Vout
Trim
GND
Rtrim-down
Module
Vout
Trim
GND
Rtrim-up
Module
Vout
Trim
GND
Rtrim-down
Module
Vout
Trim
GND
Rtrim-up
Module
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
4.5V-14V Input
0.8V-5.5V/8A Output
Efficiency Data
MODULE 3.3V
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
EFF
I
C
I
EN
CY
4.5V
8.0V
12.0V
14.0V
MODULE 2.5V
65.0%
75.0%
85.0%
95.0%
105.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
EF
F
I
CI
E
N
CY
4.5V
8.0V
12.0V
14.0V
MODULE 1.8V
65.0%
75.0%
85.0%
95.0%
105.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
E
F
F
I
CI
E
N
CY
4.5V
8.0V
12.0V
14.0V
MODULE 1.5V
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
EF
FI
C
I
EN
C
Y
4.5V
8.0V
12.0V
14.0V
MODULE 1.2V
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
EF
FI
C
I
EN
C
Y
4.5V
8.0V
12.0V
14.0V
MODULE 0.9V
60.0%
70.0%
80.0%
90.0%
100.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
EF
FI
C
I
EN
C
Y
4.5V
8.0V
12.0V
14.0V
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