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
3.0V-5.5V Input
0.8V-3.3V/12A Output
Non-Isolated
OCP/SCP
High
Efficiency
Input Under Voltage Lockout
Fixed
Frequency
Remote
On/Off
Excellent Thermal Performance
Remote Sense (SMD module)
Low
Cost
Trim
Function
Description
The Bel X7AH-12F1A0 is part of the low cost non-isolated dc to dc converter series. This converter is available
in a range of output voltages from 0.9V to 3.3V. It is packaged in a compact, overmolded package rated at 12A.
The output is closely regulated and the efficiency of 3.3V output module is typically 93% 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
0.8V-3.3V
3.0V 5.5V
12A
39.6W
93%
S7AH-12F1A0
V7AH-12F1A0
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3V
-
6V
Output Enable Terminal Voltage
-0.3V
-
7V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
1
3V
-
5.5V
Input Current (no load)
-
120mA
200mA
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
=1.0V
V
O
=0.9V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
11A
10.5A
9.0A
8.1A
6.5A
5.2A
3.2A
Remote Off Input Current
-
2mA
5mA
Input Reflected Ripple Current (pk-pk)
-
100mA
150mA
Input Reflected Ripple Current (RMS)
-
35mA
60mA
With simulated source impedance of
500nH, 5Hz to 20MHz; use a
270uF/16V cap with ESR=0.0018 ohm
max at 100KHz
I
2
t Inrush Current Transient
-
0.09A
2
s 0.2A
2
s
Turn on Voltage Threshold
2.1V
-
Turn off Voltage Threshold
-
2V
2.4V
Note:
1. The input voltage range of 3.3V output module is 4.5V-5.5V and that of 2.5V module is 3.6V-5.5V.
X7AH-12F1A0 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
3.0V-5.5V Input
0.8V-3.3V/12A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2%Vo,set
-
2%Vo,set
Vin=5V, Io= 50% load
Line Regulation
-
-
10mV
Load Regulation
-
-
15mV
Regulation Over Temperature (-40
C to +85C)
- -
15mV
Output Current
0A - 12A
Current Limit Threshold
20A - 30A
Short Circuit Surge Transient
-
0.3A
2
s 0.6A
2
s
Ripple and Noise (RMS)
-
12mV
21mV
Ripple and Noise (pk-pk)
-
50mV
100mV
Test conditions:
0-20MHz BW; 1uF ceramic
capacitor and 330uF tantalum
capacitor at the output.
Turn on Time
-
5mS
10mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
330uF
-
4800uF
Transient Response
Overshoot
-
110mV
150mV
50% ~ 100%
Max Load
Settling Time
-
40uS 80uS
Overshoot
-
110mV
150mV
100% ~ 50%
Max Load
Settling Time
All
-
40uS 80uS
Test conditions:
di/dt=0.5A/us, Vin=5V, with
330uF external load
capacitance.
Notes:
1.
All specifications are typical at 5V input, full load at 25
C
unless otherwise stated.
2. The input voltage range of 3.3V output module is 4.5V-5.5V and that of 2.5V module is 3.6V-5.5V.
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=1.0V
V
O
=0.9V
90%
86%
84%
81%
79%
77%
75%
93%
89%
87%
84%
82%
80%
78%
-
-
-
-
-
-
Vin=5V, full load
Efficiency
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=1.0V
V
O
=0.9V
85%
81%
79%
78%
76%
88%
84%
82%
81%
79%
-
-
-
-
Vin=3.3V, full load
Switching Frequency
250KHz
300KHz
350KHz
Output Trim Range
90%V
O
- 110%V
O
Remote Sense Compensation - - 0.2V
SMD
module
MTBF
TBD
Calculated Per Bell Core TR-332 (I
O
=
9.6A; 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 8.128
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 -
5.1g
-
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
3.0V-5.5V Input
0.8V-3.3V/12A Output
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3V
-
0.8V
Signal High (Unit On)
2.4V
-
Vin,max
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 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.
187
.
10
9
.
0
0
.
2
-
-
=
adj
TrimDown
V
R
187
.
0
9
.
0
0
.
7
-
-
=
adj
TrimUp
V
R
Thermal Derating Curves
S7AH-12F330
V7AH-12F330
S7AH-12F250
V7AH-12F250
Trim_do
Trim_up
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
3.0V-5.5V Input
0.8V-3.3V/12A Output
Thermal Derating Curves (continued)
S7AH-12F180
V7AH-12F180
S7AH-12F150
V7AH-12F150
S7AH-12F120
V7AH-12F120
S7AH-12F100
V7AH-12F100
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
3.0V-5.5V Input
0.8V-3.3V/12A Output
Efficiency Data
70.00%
75.00%
80.00%
85.00%
90.00%
95.00%
100.00%
1
2
3
4
5
6
7
8
9
10
11
12
4.5V
5.0V
5.5V
70.00%
75.00%
80.00%
85.00%
90.00%
95.00%
1
2
3
4
5
6
7
8
9
10
11
12
3.6V
4.5V
5.5V
X7AH-12F330 X7AH-12F250
70.00%
75.00%
80.00%
85.00%
90.00%
95.00%
1
2
3
4
5
6
7
8
9
10
11
12
3V
3.3V
5V
5.5V
70.00%
75.00%
80.00%
85.00%
90.00%
1
2
3
4
5
6
7
8
9
10
11
12
3V
3.3V
5V
5.5V
X7AH-12F180 X7AH-12F150
70.00%
75.00%
80.00%
85.00%
90.00%
1
2
3
4
5
6
7
8
9
10
11
12
3V
3.3V
5V
5.5V
70.00%
75.00%
80.00%
85.00%
90.00%
1
2
3
4
5
6
7
8
9
10
11
12
3V
3.3V
5V
5.5V
X7AH-12F120 X7AH-12F100
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