NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input
0.8V-5.5V/8A Output
x7AH-08E Series
•
•
•
•
•
Non-Isolated
Fixed Frequency
High Efficiency
High Power Density
Low Cost
PRELIMINARY
•
•
•
•
Remote On/Off
Under-voltage Lockout (UVLO)
OCP/SCP
Wide Trim Range
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
0.8V - 3.63V
4.5V – 5.5V
Input
Voltage
4.5V – 14V
8V – 14V
Max. Output
Current
8A
8A
Max. Output
Power
26.4W
44W
Typical
Efficiency
91%
93%
Part Number
Surface Mount
S7AH-08E1A0
S7AH-08E500
Part Number
Vertical Mount
V7AH-08E1A0
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
Input Voltage (continuous)
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Min
-0.3V
-0.3V
-40°C
-55°C
Typ
-
-
-
-
Max
15V
14V
85°C
125°C
Notes
Input Specifications
Parameter
Input Voltage
Vo=4.5V-5.5V
Vo=0.9V-3.63V
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
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (RMS)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3mA
180mA
50mA
5.4A
6.7A
5.3A
3.2A
3.0A
2.8A
2.0A
100mA
10mA
-
-
With simulated source impedance of 500nH, 5Hz
to 20MHz; use two 47uF/16V low ESR Tantalum
capacitors.
8.0V
4.5V
-
-
14V
14V
Min
Typ
Max
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
4.5V-14V Input
0.8V-5.5V/8A Output
Input Specifications (continued)
Parameter
I t Inrush Current Transient
2
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Min
-
-
-
-
-
Typ
0.04A
2
s
4.3V
7.5V
4.0V
7.2V
Max
-
-
-
-
-
Notes
x7AH-08E1A0
x7AH-08E500
x7AH-08E1A0
x7AH-08E500
Output Specifications
Parameter
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
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
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
Regulation Over Temperature
(-40°C to 85°C)
Output Current
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (RMS)
Ripple and Noise (pk-pk)
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
-
-
-
-
120mV
50uS
120mV
50uS
180mV
80uS
180mV
80uS
di/dt = 0.5A/uS; Vin =
12V; with a 1uF ceramic
capacitor and a 10uF/10V
Tantalum capacitor at the
output.
-
-
-
-
-
-
-
-
0A
10A
-
-
-
-
-
0uF
-
-
-
-
-
-
-
Min
4.900V
3.234V
2.450V
1.764V
1.470V
1.176V
0.882V
Typ
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
±15mV
±10mV
±8mV
±5mV
±5mV
±4mV
±4mV
±15mV
±10mV
±8mV
±5mV
±5mV
±4mV
±4mV
30mV
-
-
TBD
15mV
50mV
8mS
0%
-
Max
5.100V
3.366V
2.550V
1.836V
1.530V
1.224V
0.918V
±25mV
±16.5mV
±12.6mV
±9mV
±9mV
±8mV
±8mV
±25mV
±16.5mV
±12.5mV
±9mV
±9mV
±8mV
±8mV
50mV
8A
20A
-
30mV
80mV
20mS
3%
3200uF
BW = 0-20MHz; with a 1uf
ceramic capacitor and a
10uF/10V Tantalum
capacitor at the output.
Notes
Test condition:
Vin=12V, lout=50% full
load
All
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
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
Switching Frequency
Output Trim Range
Remote Sense Compensation
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
89%
87%
86%
84%
82%
81%
76%
-
90%V
O
90%V
O
-
93%
91%
90%
88%
86%
85%
80%
330KHz
-
-
-
TBD
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
6g
-
-
-
-
-
-
-
-
-
403%V
O
110%V
O
0.2V
Calculated Per Bell Core TR-332 (I
O
=
Nominal; T
a
= 25°C)
x7AH-08E1A0
1
x7AH-08E500
2
Min
Typ
Max
Notes
Measured at Vin=12V, full load
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
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
-0.3V
2.4V
-
-
0.8V
14V
Remote on/off pin open, unit on.
Min
Typ
Max
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
4.5V-14V Input
0.8V-5.5V/8A Output
Output Trim Equations
1) x7AH-08E1A0
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
R
trim
−
down
=
1.076
−
5.631
V
o
−
V
adj
Rtrim-down
Module
Trim
GND
R
trim
−
up
3.759
=
−
0.261
V
adj
−
V
o
Vout
Module
Trim
Rtrim-up
GND
Note:
Output voltage Vo=0.9V when Rtrim_up is not connected.
2) x7AH-08E500
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
R
trim
−
down
=
23.099
−
5.631
V
o
−
V
adj
Rtrim-down
Module
Trim
GND
Vout
R
trim
−
up
=
3.759
−
0.261
V
adj
−
V
o
Module
Trim
Rtrim-up
GND
Note:
Output voltage Vo=5V when Rtrim_up is not connected.
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
100.0%
95.0%
90.0%
85.0%
80.0%
75.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
105.0%
MODULE 2.5V
EFFICIENCY
4.5V
8.0V
12.0V
14.0V
EFFICIENCY
95.0%
85.0%
75.0%
65.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
4.5V
8.0V
12.0V
14.0V
MODULE 1.8V
105.0%
MODULE 1.5V
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
EFFICIENCY
EFFICIENCY
95.0%
85.0%
75.0%
65.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
4.5V
8.0V
12.0V
14.0V
4.5V
8.0V
12.0V
14.0V
MODULE 1.2V
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
100.0%
MODULE 0.9V
EFFICIENCY
4.5V
8.0V
12.0V
14.0V
EFFICIENCY
90.0%
80.0%
70.0%
60.0%
0.8
2
4
6
8
OUTPUT CURRENT(A)
4.5V
8.0V
12.0V
14.0V
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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