NON-ISOLATED DC/DC CONVERTERS
12V Input
0.9V-3.63V/7A Output
X7AH-07A Series
•
•
•
•
•
Non-Isolated
High Efficiency
High Power Density
PRELIMINARY
•
•
•
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Remote On/Off
Input Under Voltage Lockout
OCP/SCP
Wide Range Trim
Excellent Thermal Performance
Low Cost
Description
The Bel X7AH-07AXX0 modules are a series of non-isolated, step down DC/DC power converters that operate
from a nominal 12V source. These converters are available in a range of output voltages from 0.9V to 3.3V. It is
packaged in a compact, overmolded package rated at 7A. 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 of 3.3V output is typically 88% at full load. Typical features include remote on/off, input under
voltage lockout, over current protection and short circuit protection.
Part Selection
Output
Voltage
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
0.9V - 3.63V
Input
Voltage
12V
12V
12V
12V
12V
12V
12V
Max. Output
Current
7A
7A
7A
7A
7A
7A
7A
Max. Output
Power
23.1W
17.5W
12.6W
10.5W
8.4W
6.3W
23.1W
Typical
Efficiency
88%
86%
83%
81%
78%
74%
88%
Part Number
Surface Mount
S7AH-07A330
S7AH-07A250
S7AH-07A180
S7AH-07A150
S7AH-07A120
S7AH-07A090
S7AH-07A1A0
Part Number
Vertical Mount
V7AH-07A330
V7AH-07A250
V7AH-07A180
V7AH-07A150
V7AH-07A120
V7AH-07A090
V7AH-07A1A0
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
Input Current (no load)
Input Current (full load)
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Remote Off Input Current
Min
10V
-
-
-
-
-
-
-
-
Typ
-
-
-
-
-
-
-
-
3mA
Max
14V
100mA
3.0A
2.6A
1.9A
1.6A
1.3A
1.0A
10mA
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
12V Input
0.9V-3.63V/7A Output
Parameter
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (RMS)
I t Inrush Current Transient
Turn on Voltage Threshold
Turn off Voltage Threshold
2
Input Specifications (continued)
Min
-
-
-
-
8.5V
Typ
180mA
50mA
TBD
9.5V
9.0V
Max
-
-
-
-
9.5V
Notes
Tested with simulated source impedance of
500nH, 5Hz to 20MHz and two 270uF/16V
OSC capacitors with ESR=0.018 ohm max. at
100KHz
Output Specifications
Parameter
Output Voltage Set Point
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
Load Regulation
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)
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Ripple and Noise (pk-pk)
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
Overshoot
50% ~ 100%
Max Load
Settling Time
Overshoot
100% ~ 50%
Max Load
Settling Time
-
-
-
-
-
-
-
-
330uF
-
-
-
-
70mV
70mV
60mV
60mV
60mV
50mV
8mS
0%
-
120mV
50uS
120mV
50uS
100mV
100mV
100mV
80mV
80mV
70mV
20mS
3%
2800uF
180mV
80uS
180mV
80uS
-
-
-
-
-
-
-
0A
10A
-
-
-
-
-
-
-
Min
3.247V
2.460V
1.771V
1.476V
1.181V
0.886V
-
Typ
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
±3mV
±5mV
±5mV
±5mV
±3mV
±3mV
±3mV
30mV
-
-
TBD
20mV
20mV
15mV
15mV
15mV
10mV
Max
3.353V
2.540V
1.829V
1.524V
1.219V
0.914V
±6mV
±10mV
±10mV
±10mV
±6mV
±6mV
±6mV
50mV
7A
20A
-
50mV
50mV
40mV
40mV
30mV
30mV
Notes
Test conditions:
Vin=12V, Io=50% full load
Test condition: 0-20MHz
BW, with a 330uF/10V tan
capacitor at the output.
All
Test conditions:
di/dt = 0.5A/uS; Vin = 12V;
with a 330uF/10V Tan.
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
12V Input
0.9V-3.63V/7A Output
General Specifications
Parameter
Efficiency
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 (wide trim)
Output Trim Range (narrow trim)
V
O
=1.2V-3.3V
V
O
=0.9V
MTBF
Dimensions (surface mount)
Inches (L
×
W
Millimeters (L
×
W
Dimensions (vertical)
Inches (L
×
W
Millimeters (L
×
W
Weight
×
H)
×
H)
×
H)
×
H)
-
85%
83%
80%
78%
75%
71%
250KHz
-
90%Vo
-
88%
86%
83%
81%
78%
74%
300KHz
-
-
-
TBD
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.13
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
5g
-
-
-
-
-
-
-
350KHz
403%Vo
110%Vo
110%Vo
Calculated Per Bell Core TR-332 (I
O
=
Nominal; T
a
= 25°C)
V
O
=0.9V
Measured at Vin=12V, full load and
Ta=25°C
Min
Typ
Max
Notes
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
-0.3V
3.5V
-
-
1V
14V
Min
Typ
Max
Notes
Remote on/off pin open, unit on.
Output Trim Equations
1) X7AH-07A1A0
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 Up resistor should be connected between
the Trim pin and Ground.
R
TrimUp
=
6.062
−
1.05
V
adj
−
V
nom
R
TrimUp
Note: Output voltage Vo=0.9V when R
trimUp
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
12V Input
0.9V-3.63V/7A Output
Output Trim Equations (Continued)
2) X7AH-07AXX0
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.
R
TrimDown
A
=
−
B
V
nom
−
V
adj
R
TrimDown
R
TrimUp
=
V
adj
C
−
D
−
V
nom
R
TrimUp
Vnom
3.3
2.5
1.8
1.5
1.2
0.9
A
22.56
15.62
9.55
6.95
4.35
N/A
B
18.66
18.66
18.66
18.66
18.66
N/A
C
6.06
6.06
6.06
6.06
6.06
6.06
D
10.00
10.00
10.00
10.00
10.00
1.05
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
12V Input
0.9V-3.63V/7A Output
bel
Pin Connections
Pin
1
2
3
4
5
6
7
Function
Remote On/Off (option)
Vin
Ground
Vout
Trim (option)
N/A
N/A
bel
Pin Connections
Pin
Function
Remote On/Off (option)
Vin
Ground
Vout
Trim (option)
bel
1
2
3
4
5
2004 Bel Fuse Inc. Specifications subject to change without notice. 070204
CORPORATE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
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