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
3.0 V-3.6 V Input
5.0 V/3 A Output
Non-Isolated
Allows Burst Mode Operation
High
Efficiency
at Low Load Currents
Fixed Frequency (530 kHz)
Trim
Function
(Option)
Low
Profile
Package
Description
The Bel x7AH-03C500 is a part of the low cost non-isolated dc/dc converter series. The modules use a SMD or
SIP package for ease of layout and space savings. The output is closely regulated and the efficiency is typically
90% 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
5.0 V
3.0 V 3.6 V
3 A
15 W
90%
S7AH-03C500
V7AH-03C500
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)
2.8 V
-
4.0 V
Ambient Temperature
0
C
-
70
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
3.0 V
-
3.6 V
Input Current
-
-
6.3 A
Input Reflected Ripple Current
(rms)
-
30 mA
60 mA
Input Reflected Ripple Current
(pk-pk)
-
100 mA
150 mA
I
2
t Inrush Current Transient
-
0.02 A
2
s 0.05
A
2
s
Turn-on Voltage Threshold
-
2.8 V
2.9 V
Note:
The input reflected ripple current is measured with simulated source impedance of 500 nH, 5 Hz to 20
MHz; Use one 270 uF/16 V capacitor with ESR = 0.018 ohm max. at 100KHz at 25
C
.
x7AH-03C500
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
3.0 V-3.6 V Input
5.0 V/3 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
4.875 V
5.0 V
5.125 V
Load Regulation
-
25 mV
50 mV
Line Regulation
-
20 mV
40 mV
Regulation Over Temperature
(0
C to 70 C)
-
20 mV
30 mV
Output Current
0 A
-
3 A
Ripple and Noise
1
(RMS)
-
15 mV
25 mV
Ripple and Noise
1
(pk-pk)
Burst Mode
2
Fixed Frequency
-
-
100 mV
70 mV
-
100 mV
Io = 0 A
Io = 3 A
Rise Time
-
30 mS
50 mS
Overshoot at Turn on
-
0%
5%
Output Capacitance
0 uF
-
1500 uF
Transient Response
50% ~ 100% Max Load
-
100 mV
150 mV
Settling Time
-
50 uS
120 uS
100% ~ 50% Max Load
-
100 mV
150 mV
Settling Time
V
O
=5 V
- 50
uS
120 uS
di/dt = 0.5 A/uS; Vin = 3.3 V;
Ta = 25
C without external
capacitor
Notes:
All specifications are typical at nominal input, full load at 25
C unless otherwise stated.
1. Test condition of the output ripple and noise: 0-20 MHz BW.
2. Recommend a 220 uF capacitor at output if the module operates at burst mode (light load).
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
V
O
=5.0 V
87%
90%
-
Switching Frequency
460 kHz
530 kHz
630 kHz
Output Trim Range
90% V
O
- 110%
V
O
MTBF
8,100,000 hours
Calculated Per Bell Core TR-332
(Vin=3.3 V; Vo=5 V; I
O
= 2.4 A; T
a
= 25
C)
Dimensions (surface mount)
Inches (L W H)
Millimeters (L W H)
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
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 -
5.2
g
-
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
3.0 V-3.6 V Input
5.0 V/3 A Output
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.
Note:
Output voltage Vo=5.0128 V when Rtrim is open.
Efficiency Data
Vo=5.0V efficiency curve
75.0%
80.0%
85.0%
90.0%
0.300 0.750 1.500 2.250 3.000
Iout (A)
E
f
f
i
c
i
en
cy
3.0 V
3.3 V
3.6 V
)
8
.
7
033
.
12
(
-
-
=
-
adj
o
down
trim
V
V
R
)
64
.
4
808
.
3
(
-
-
=
-
o
adj
up
trim
V
V
R
Vout
Trim
GND
Rtrim-down
Module
Vout
Trim
GND
Rtrim-up
Module
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
3.0 V-3.6 V Input
5.0 V/3 A Output
Thermal Derating Curve
x7AH-03C500
2005 Bel Fuse Inc. Specifications subject to change without notice. 040805
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
3.0 V-3.6 V Input
5.0 V/3 A Output
S7AH-03C500
V7AH-03C500
Pin Connections
Pin
Function
1 N/A
2 Vin
3 Ground
4 Vout
5 Trim
6 N/A
7 N/A
Pin Connections
Pin
Function
1 N/A
2 Vin
3 Ground
4 Vout
5 Trim
b e l
b e l
b e l
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