NON-ISOLATED DC/DC CONVERTERS
3.3V Input
0.9V-2.5V/3A Output
x7AH-03C1A0 Series
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•
•
•
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Non-Isolated
High Efficiency
Low Cost
Excellent Thermal Performance
Input Under Voltage Lockout
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OCP/SCP
Wide Range Trim
Remote On/Off
Industrial Temperature Range
Description
The Bel x7AH-03C1A0 modules are a series of non-isolated, step down DC/DC converters that operate from a
nominal 3.3V source. These converters are available in a range of output voltages from 0.9V to 2.5V. It is
packaged in a compact, overmolded package rated at 3A. 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 2.5V output 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
0.9-2.5V
2.5V
1.8V
1.5V
1.2V
0.9 V
Input
Voltage
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
Max. Output
Current
3A
3A
3A
3A
3A
3A
Max. Output
Power
7.5W
7.5W
5.4W
4.5W
3.6W
2.7W
Typical
Efficiency
93%
93%
89%
87%
84%
81%
Part Number
Surface Mount
S7AH-03C1A0
S7AH-03C250
S7AH-03C180
S7AH-03C150
S7AH-03C120
S7AH-03C090
Part Number
Vertical Mount
V7AH-03C1A0
V7AH-03C250
V7AH-03C180
V7AH-03C150
V7AH-03C120
V7AH-03C090
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
6V
6V
85°C
125°C
Notes
Input Specifications
Parameter
Input Voltage
Input Current (no load)
Input Current (full load)
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Remote Off Input Current
-
-
-
-
-
-
-
-
-
-
-
7mA
3.1A
2.3A
1.9A
1.6A
1.2A
14mA
Min
3V
-
Typ
-
-
Max
3.6V
110mA
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
3.3V Input
0.9V-2.5V/3A Output
Input Specifications (continued)
Parameter
Input Reflected Ripple Current (pk-pk)
Min
-
Typ
50mA
Max
100mA
Notes
With simulated source
impedance of 500nH, 5Hz
to 20MHz; use a
270uF/6.3V capacitor with
ESR=0.03 ohm max, at
100KHz.
Input Reflected Ripple Current (RMS)
I t Inrush Current Transient
Turn on Voltage Threshold
Turn off Voltage Threshold
2
-
-
-
-
15mA
0.01A s
2.7V
2.4V
2
25mA
0.02A s
-
-
2
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Line Regulation
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Load Regulation
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)
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
Output Current
Current Limit Threshold
Short Circuit Surge Transient
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=0.9V
-
-
-
-
-
-
-
-
-
-
1mV
1mV
1mV
1mV
1mV
5mV
5mV
5mV
5mV
5mV
-
-
-
-
-
1mV
1mV
1mV
1mV
1mV
5mV
5mV
5mV
5mV
5mV
2.450V
1.764V
1.470V
1.176V
0.882V
2.5V
1.8V
1.5V
1.2V
0.9V
2.550V
1.836V
1.530V
1.224V
0.918V
Test conditions:
Vin=3.3V, Io= full load
Min
Typ
Max
Notes
-
-
-
-
-
0A
5A
10mV
10mV
10mV
10mV
10mV
-
-
0.04A s
2
0.04A s
0.04A
2
s
2
0.04A s
2
0.04A s
2
20mV
20mV
20mV
20mV
20mV
3A
9A
0.08A s
2
0.08A s
0.08A
2
s
2
0.08A s
2
0.08A s
2
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
3.3V Input
0.9V-2.5V/3A Output
Output Specifications (continued)
Parameter
Ripple and Noise (RMS)
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
=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
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
V
O
=0.9V
V
O
=1.2V
V
O
=1.5V
V
O
=1.8V
V
O
=2.5V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
100mV
30uS
100mV
30uS
100mV
30uS
100mV
30uS
90mV
30uS
90mV
30uS
90mV
30uS
90mV
30uS
90mV
30uS
90mV
30uS
130mV
60uS
130mV
60uS
130mV
60uS
130mV
60uS
120mV
60uS
120mV
60uS
120mV
60uS
120mV
60uS
120mV
60uS
120mV
60uS
Test conditions:
di/dt=0.5A/us, Vin=3.3V,
without any external
capacitor at the output.
-
-
-
-
-
-
-
0uF
45mV
45mV
45mV
45mV
45mV
7mS
0%
-
70mV
70mV
70mV
70mV
70mV
15mS
1%
1200uF
-
-
-
-
-
10mV
10mV
10mV
10mV
10mV
20mV
20mV
20mV
20mV
20mV
Min
Typ
Max
Notes
Test conditions:
0-20MHz BW; 0.1uF
ceramic capacitor and 10uF
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
3.3V Input
0.9V-2.5V/3A Output
General Specifications
Parameter
Efficiency
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)
Vo=1.2V-2.5V
Vo=0.9V
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
90%
86%
84%
81%
78%
250KHz
0
90%Vo
-
93%
89%
87%
84%
81%
300KHz
-
-
-
3,131,719 hours
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
-
-
-
-
-
-
340KHz
292%V
O
110%Vo
110%Vo
Calculated Per Bell Core TR-332 (I
O
=
Nominal; T
a
= 25°C)
Vo=0.9V
Measured at Vin=3.3V, full load and
Ta=25°C
Min
Typ
Max
Notes
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
-0.3V
1.8V
-
-
0.3V
3.6V
Min
Typ
Max
Notes
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
3.3V Input
0.9V-2.5V/3A Output
Output Trim Equations
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
Vout
Rtrimdown
Module
Trim
GND
C
R
trimup
=
−
D
V
adj
−
V
nom
Vout
Module
Trim
Rtrimup
GND
Vnom
0.9 – 2.5
2.5
1.8
1.5
1.2
0.9
A
N/A
7.9117
4.6538
3.2633
1.8699
N/A
B
N/A
16.14
20.84
16.14
11.45
N/A
C
3.712
3.712
3.712
3.712
3.712
3.712
D
1.54
11.5
16.2
11.5
6.81
33.2
Notes
Vo=0.9V when Rtrim is open
Vo=2.505V when Rtrim is open
Vo=1.803V when Rtrim is open
Vo=1.503V when Rtrim is open
Vo=1.203V when Rtrim is open
Vo=0.903V when Rtrim is open
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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