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
-5V/1A & -12V/0.5A Output
Non-Isolated
Low
Cost
Fixed
Frequency
Excellent Thermal Performance
High
Efficiency
High Power Density
OCP/SCP
Industrial
Temperature
Range
Description
The Bel x7AH-01FxxN modules are non-isolated, step down DC/DC converters that operate from a 3V-5.5V
source. Output voltage are -5V,-12V. They are packaged in a compact, overmolded package rated at 1A, 0.5A.
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 is typically 88% at 1A, -5V output 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
-5V
3.0V 5.5V
1A
5W
88%
S7AH-01F50N
V7AH-01F50N
-12V
3.0V 5.5V
0.5A
6W 88%
S7AH-01FX2N
V7AH-01FX2N
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
-
7V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
3V
-
5.5V
Input Current (full load)
V
O
=-5V
V
O
=-12V
-
-
-
-
2.1A
2.5A
Input Current (no load)
V
O
=-5V
V
O
=-12V
-
-
-
-
150mA
200mA
Input Reflected Ripple Current (pk-pk)
-
80mA
160mA
Input Reflected Ripple Current (RMS)
-
20mA
50mA
For -5V output, use a 680uF/6.3V
Oscon capacitor; For -12V output,
use 1000uF electrolytic capacitor &
22uF/10V ceramic at the input.
I
2
t Inrush Current Transient
-
-
0.01A
2
s
Turn-on Voltage Threshold
-
2.63V
-
Turn-off Voltage Threshold
V
O
=-5V
V
O
=-12V
0.4V
1.0V
-
-
2.0V
2.3V
Note: All specifications are typical at 25
C
unless otherwise stated.
x7AH-01FxxN Series
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
-5V/1A & -12V/0.5A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
V
O
=-5V
V
O
=-12V
-5.1V
-12.24V
-5V
-12V
-4.9V
-11.76V
Test conditions:
Vin=5.0V, lout=half load; with
220uF/10V Tantalum Capacitor &
0.1uF ceramic Capacitor (Vo=-5V)
or 47uF/25V tantalum capacitor &
0.1uF ceramic Capacitor (Vo=-
12V).
Line Regulation
V
O
=-5V
V
O
=-12V
-20mV
-120mV
-
-
20mV
120mV
Load Regulation
V
O
=-5V
V
O
=-12V
-60mV
-120mV
-
-
60mV
120mV
Regulation Over Temperature
(-40
C to +85
C)
V
O
=-5V
V
O
=-12V
-80mV
-240mV
-
-
80mV
240mV
Ripple and Noise (RMS)
V
O
=-5V
V
O
=-12V
-
-
25mV
40mV
40mV
70mV
Ripple and Noise (pk-pk)
V
O
=-5V
V
O
=-12V
-
-
90mV
120mV
120mV
240mV
Test conditions:
BW = 0-20MHz; with 220uF/10V
Tan Cap & 0.1uF ceramic capacitor
(Vo=-5V) or 47uF/25V tantalum
capacitor & 0.1uF ceramic
Capacitor (Vo=-12V).
Output Current Range
V
O
=-5V
V
O
=-12V
0A
0A
-
-
1A
0.5A
Output DC Current Limit
-
200%
-
Short Circuit Surge Transient
-
-
0.01A
2
s
Turn on Time
-
10mS
30mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
V
O
=-5V
V
O
=-12V
220uF
47uF
-
-
470uF
150uF
Transient Response
Overshoot -
80mV
-
50% ~ 100%
Max Load
Settling Time
-
40uS
-
Overshoot -
80mV
-
100% ~ 50%
Max Load
Settling Time
Vo=-5V
- 40uS
-
Overshoot -
130mV
-
50% ~ 100%
Max Load
Settling Time
-
50uS
-
Overshoot -
130mV
-
100% ~ 50%
Max Load
Settling Time
V
O
=-12V
- 50uS
-
Test Conditions:
di/dt = 0.1A/uS; Vin = 5.0V; Ta =
25
C and with 220uF/10V
Tantalum Cap & 0.1uF ceramic
Capacitor (Vo=-5V) or 47uF/25V
tantalum Cap & 0.1uF ceramic
Capacitor (Vo=-12V).
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
3.0V-5.5V Input
-5V/1A & -12V/0.5A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
V
O
=-5V
V
O
=-12V
84%
84%
88%
88%
-
-
Vin=5V; lo=lo, max
Switching Frequency
250KHz
300KHz
350KHz
MTBF
4,883,163 hours
Calculated Per Bell Core TR-332 (I
O
=
80%lo,max; T
a
= 25
C)
Dimensions (surface mount)
Inches (L
W
H)
Millimeters (L
W
H)
0.78 x 0.7 x 0.32
19.812 x 17.78 x 8.128
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 -
4.9g
-
Note: All specifications are typical at 25
C
unless otherwise stated.
Thermal Derating Curve
x7AH-01F50N
Efficiency Data
MODULE -5V
55.0%
65.0%
75.0%
85.0%
95.0%
0.10
0.25
0.50
0.75
1.00
OUTPUT CURRENT
EF
F
I
CI
EN
C
Y
3.3V
5V
5.5V
MODULE -12V
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.050
0.125
0.250
0.375
0.500
OUTPUT CURRENT
E
FFI
C
I
E
N
C
Y
3.3V
5V
5.5V
x7AH-01F50N
x7AH-01FX2N
2005 Bel Fuse Inc. Specifications subject to change without notice. 011705
CORPORATE FAR
EAST
EUROPE
Bel Fuse Inc.
Bel Fuse Ltd.
Bel Fuse Europe Ltd.
206 Van Vorst Street
8F/ 8 Luk Hop Street
Preston Technology Management Centre
Jersey City, NJ 07302
San Po Kong
Marsh Lane, Suite G7, Preston
Tel 201-432-0463
Kowloon, Hong Kong
Lancashire, PR1 8UD, U.K.
Fax 201-432-9542
Tel 852-2328-5515
Tel 44-1772-556601
www.belfuse.com
Fax 852-2352-3706
Fax 44-1772-888366
www.belfuse.com
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
3.0V-5.5V Input
-5V/1A & -12V/0.5A Output
S7AH-01FxxN
V7AH-01FxxN
Pin Connections
Pin
Function
1 N/A
2 Vin
3 Ground
4 Vout
5 N/A
6 N/A
7 N/A
Pin Connections
Pin
Function
1 N/A
2 Vin
3 Ground
4 Vout
5 N/A
b e l
b e l
b e l
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